Engineering Geology最新文献_第2页

A unified van Genuchten-type water retention model for compacted bentonite 压实膨润土的统一van genuchten型保水性模型

IF 8.4 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2026-03-26 Epub Date: 2026-01-27 DOI: 10.1016/j.enggeo.2026.108590

Jinwoo Kim , Minseop Kim , Seok Yoon , Jin-Seop Kim

Water retention behavior of bentonite is essential for the analysis of engineered barrier systems in deep geological repositories for high-level radioactive waste. Despite being a popular choice, the van Genuchten model requires labor-intensive calibration for each material and dry density condition and cannot propagate engineering-scale uncertainties from in-situ buffer evolution and mineralogical heterogeneity. This study proposes a unified van Genuchten-type model in which the fitting parameters are expressed as empirical functions of effective water retention density (EWRD). EWRD, defined as effective montmorillonite dry density normalized by specific surface area, incorporates the combined effects of dry density, montmorillonite content, and microstructure within a single porosity framework. A comprehensive set of over 200 confined wetting data points for seven Na- and Ca-type bentonites revealed that the van Genuchten parameters

α

and

n

collapse onto unique trends when plotted against EWRD, confirming its dominant control on water retention. For validation, the predictive ability of the unified model for dry density variation was first tested by successfully reproducing the unconfined wetting of FEBEX bentonite, after a simple correction of bias calculated from initial test conditions. Second, additional data were generated for two batches of Bentonil-WRK differing in montmorillonite content by ∼10% for cross-validation. Excellent agreement between model prediction and experiments was observed, demonstrating reliable extrapolation across mineralogical heterogeneity. By preserving the form of the classical van Genuchten model, the proposed approach can be readily implemented in existing hydro-mechanical codes, providing informed estimates of water retention curves across various buffer designs and operation scenarios.

膨润土的保水特性对高放废物深地质处置库工程屏障系统的分析至关重要。尽管van Genuchten模型是一种受欢迎的选择，但它需要对每种材料和干密度条件进行大量校准，并且无法传播来自原位缓冲演化和矿物非均质性的工程尺度不确定性。本文提出了一个统一的van genuchten型模型，其中拟合参数表示为有效持水密度（EWRD）的经验函数。EWRD被定义为通过比表面积归一化的有效蒙脱土干密度，它综合了干密度、蒙脱土含量和单一孔隙结构框架内微观结构的影响。对7种Na型和ca型膨润土的200多个限制润湿数据点的综合分析表明，当与EWRD进行比较时，van Genuchten参数α和n呈现出独特的趋势，证实了其对保水的主要控制。为了验证统一模型对干密度变化的预测能力，首先通过成功重现FEBEX膨润土的无侧限润湿，在对初始测试条件计算的偏差进行简单校正后，测试了统一模型对干密度变化的预测能力。其次，生成了两批膨润土- wrk的额外数据，蒙脱土含量相差约10%，用于交叉验证。模型预测和实验结果非常吻合，证明了可靠的矿物非均质性外推。通过保留经典van Genuchten模型的形式，所提出的方法可以很容易地在现有的水力力学规范中实施，提供各种缓冲设计和操作场景下的水保持曲线的明智估计。

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引用次数: 0

Dynamic penetration test-based probabilistic hyperbolic model for evaluating liquefaction potential of gravelly soils 基于动态侵彻试验的碎石土液化潜力概率双曲模型

IF 8.4 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2026-03-26 Epub Date: 2026-02-09 DOI: 10.1016/j.enggeo.2026.108612

Wei Duan , Wenting Zhai , Zening Zhao , Guojun Cai , Xidong Zhang , Yifei Sun , Ning Zhang , Shaoyun Pu , Zhiming Liu , Yu Zhang , Songyu Liu

Recent earthquakes, such as the 2008 Wenchuan earthquake, have shown that gravelly soils are susceptible to liquefaction and can pose serious risks to infrastructure. Conventional in situ tests such as the standard penetration test (SPT) and cone penetration test (CPT) may be impractical in gravelly soils, whereas the dynamic penetration test (DPT) offers a viable alternative. In this study, probabilistic and deterministic hyperbolic models are developed within the framework of the Chinese Code for Seismic Design of Buildings using a global database of DPT-based liquefaction case histories. The models incorporate seismic intensity, groundwater level, and soil depth, and explicitly account for uncertainty and sampling bias. The results show that the model is accurate, straightforward to implement, and preserve the physically consistent non-decreasing trend of liquefaction resistance with depth. It yields an optimal probability threshold of 0.57 for deterministic screening under equal misclassification costs. A practical step-by-step workflow is provided to facilitate engineering implementation. The results support depth-consistent liquefaction evaluation of gravelly soils for seismic hazard assessment and design.

最近发生的地震，如2008年汶川地震，表明含砾土壤容易液化，并可能对基础设施构成严重风险。传统的原位试验，如标准贯入试验（SPT）和锥贯入试验（CPT）在砾石土中可能不切实际，而动态贯入试验（DPT）提供了一种可行的替代方案。在这项研究中，概率和确定性双曲模型是在中国建筑抗震设计规范的框架下，利用基于dpt的液化案例历史的全球数据库开发的。这些模型考虑了地震强度、地下水位和土壤深度，并明确地考虑了不确定性和抽样偏差。结果表明，该模型准确、易于实现，并保持了液化阻力随深度不减小的物理一致性。在错误分类成本相等的情况下，确定筛选的最优概率阈值为0.57。提供了一个实用的分步工作流程，以促进工程实现。研究结果为地震危险性评价和设计中砂质土的深度一致液化评价提供了依据。

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引用次数: 0

Modeling the spatial structural network of layered rock masses using an innovative hierarchical method 利用创新的分层方法对层状岩体的空间结构网络进行建模

IF 8.4 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2026-03-26 Epub Date: 2026-01-28 DOI: 10.1016/j.enggeo.2026.108595

Jiewei Zhan , Changle Pu , Zhaoyue Yu , Yongqiang Liu , Jianbing Peng

The discrete fracture network (DFN) modeling technique is a critical method for revealing the three-dimensional structural characteristics of rock masses and predicting the connectivity and stability of fractured rock masses. Constrained by the dominant bedding planes, discontinuities in layered rock masses often intersect with bedding planes to form characteristic T-type topological structures. Considering that existing DFN modeling techniques are unable to accurately reproduce this structural characteristic, this paper proposes an innovative hierarchical method for spatial structural modeling of layered rock masses. First, a three-dimensional fusion model of outcrop is constructed using optical images and point cloud data collected by UAV photogrammetry, on which the geometric parameters of discontinuities are extracted. On the basis of the interpreted discontinuity data, a characterization study is subsequently conducted on the orientation, major axis rotation angle, size, and spatial point distribution of the discontinuities. By introducing a hierarchical modeling method based on the sequence of bedding planes, strata-bound discontinuities and non-strata-bound discontinuities, the limitations of traditional methods in simulating the unique intersection relationships of discontinuities in layered rock masses is effectively addressed. In addition, the Latin hypercube sampling is employed to determine the position of non-strata-bound discontinuities, which effectively reduces the edge effects in the DFN modeling process. Finally, a layered rock mass discrete fracture network model is constructed using an outcrop from a highway slope in Chongqing as a case study, and the effectiveness of the proposed method is validated through both geometric characterization and topological structure analysis. This work provides a universal methodology for spatial structural modeling of layered rock masses and has good application prospects.

离散裂隙网络（DFN）建模技术是揭示岩体三维结构特征、预测裂隙岩体连通性和稳定性的重要方法。受主导层理面约束，层状岩体中的不连续面常与层理面相交，形成典型的t型拓扑结构。针对现有DFN建模技术无法准确再现这一结构特征的问题，本文提出了一种创新的层状岩体空间结构分层建模方法。首先，利用无人机摄影测量采集的光学影像和点云数据构建露头三维融合模型，提取不连续面几何参数；在解译的间断面数据基础上，对间断面的方位、长轴旋转角度、大小、空间点分布等进行表征研究。通过引入基于层理面、层界结构面和非层界结构面顺序的分层建模方法，有效解决了传统方法在模拟层状岩体中结构面独特相交关系时的局限性。此外，采用拉丁超立方体采样方法确定非层界不连续点的位置，有效降低了DFN建模过程中的边缘效应。最后，以重庆某公路边坡露头为例，建立了层状岩体离散裂隙网络模型，并通过几何表征和拓扑结构分析验证了该方法的有效性。该工作为层状岩体空间结构建模提供了一种通用的方法，具有良好的应用前景。

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引用次数: 0

Startup mechanism of locked segment–dominated rockslides: Insights from a physical model experiment replicating natural infiltration conditions 锁定段型滑坡的启动机制：来自模拟自然入渗条件的物理模型实验的见解

IF 8.4 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2026-03-26 Epub Date: 2025-12-08 DOI: 10.1016/j.enggeo.2025.108494

Yuan Cui , Chao Xu , Hongran Chen , Yifei Cui , Lei Xue , Siqing Qin

Heavier rainfall is widely recognized to increase the likelihood of landslides. However, evidence is accumulating that many large-scale rockslides are not directly triggered by rainfall but are controlled by the failure of internal locked segments. These locked segment–dominated rockslides are often highly destructive, making it urgent to clarify their startup mechanisms and the role of rainfall in their evolution. Herein, an approximately 19-d physical model experiment was conducted to simulate a three-section locked segment–dominated rockslide under rainfall by employing a new model material and an internal water injection method to accurately replicate natural infiltration. Results indicated that the onset of accelerated displacement of the slope was fundamentally caused by large-scale cracking of the locked segment at its volume-expansion point, which triggered a noticeable increase in the sliding speed, followed by spontaneous progressive cracking of the locked segment, which drove sustained displacement acceleration. Once the shear stress borne by the locked segment reached or exceeded its long-term shear strength, a rockslide could be induced regardless of rainfall. Notably, the cracking activity of the locked segment exhibited a characteristic large–small–large pattern during the accelerated displacement stage. The first large-scale cracking event, accompanied by displacement acceleration, can serve as an identifiable precursory rockslide startup indicator; the second large-scale cracking event indicates locked segment fracture and an impending rockslide. Overall, these findings demonstrate that the evolution of locked segment–dominated rockslides follows a characteristic pattern, providing a solid physical foundation for reliably predicting and forecasting their startup.

人们普遍认为，较强的降雨会增加发生山体滑坡的可能性。然而，越来越多的证据表明，许多大型滑坡不是由降雨直接引发的，而是由内部锁定段的破坏控制的。这些以锁定段为主导的滑坡通常具有高度破坏性，因此迫切需要澄清其启动机制和降雨在其演变中的作用。本文采用一种新型模型材料，采用内注水方法，对降雨条件下的三段锁定段主导岩滑进行了约19 d的物理模型实验，以精确模拟自然入渗。结果表明：边坡加速位移的发生，其根本原因是锁定段在其体积膨胀点处发生大规模开裂，引发滑动速度的显著增加，随后锁定段自发渐进开裂，推动位移持续加速；一旦锁定段所承受的剪应力达到或超过其长期抗剪强度，无论降雨如何，都可能诱发滑坡。值得注意的是，在加速位移阶段，锁定段的开裂活动表现出大-小-大的特征。第一次大规模裂缝事件伴随着位移加速，可作为可识别的岩滑启动前兆指标；第二次大规模裂缝事件表明锁定段断裂和即将发生的岩滑。总的来说，这些研究结果表明，锁定段状滑坡的演化遵循一种特征模式，为可靠地预测和预测其启动提供了坚实的物理基础。

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引用次数: 0

Solidification of high water content marine deposits by a novel in-situ treatment of magnesia-based bio-cement: Insight from clay content effect 镁基生物水泥原位处理高含水量海洋沉积物的固化研究：来自粘土含量效应的见解

IF 8.4 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2026-03-26 Epub Date: 2026-02-04 DOI: 10.1016/j.enggeo.2026.108606

Dian-Long Wang , Wen-Bo Chen , Hao-Yu Fang , Zhen-Yu Yin , Xiao-Hua Pan , Chao-Sheng Tang

Sustainable solidification of high water content marine deposits (MD) is crucial for coastal infrastructure, where clay content (CC) of MD critically affects its performance. This study proposed an in-situ treatment of magnesia-based bio-cement (MBC) for MD solidification. This novel approach utilizes concentrated bacteria solution to hydrolyze urea directly within high water content MD and then engage the bio‑carbonation of reactive MgO. The in-situ MBC-solidified MD (MBC-samples) with 10–70% CC were prepared to validate the feasibility and reveal CC effects by investigating their mechanical properties, chemical characteristics, and microstructures. The results indicate that in-situ MBC can effectively solidify high water content MD by utilizing its inherent water for urea hydrolysis, circumventing further water content increment by bacteria solution addition. The increase in CC significantly improved unconfined compressive strength (UCS) by 370.0% to 0.94 MPa, but decreased the degree of carbonation (DC, evaluating hydrated magnesia carbonates (HMCs) yield) by 30.3% to 0.31. Pre-hydrolysis treatment increased the DC and UCS of MBC-samples by 24.4% and 177.0%, respectively. Although higher CC inhibits urea hydrolysis within MD and reduces HMCs production, it decreases pore volume and dominant pore size, changing HMCs development and distribution, which compensates for the lower DC and ultimately improves the UCS of MBC-samples. The relationship between CC and UCS was quantitatively analyzed by considering the decreased DC effects via inhibiting reactions and microstructural refinement through reduced dominant pore diameters with higher CC. These findings provide theoretical and practical insights for sustainable marine deposit solidification.

高含水量海相沉积物（MD）的持续固化对沿海基础设施至关重要，其中粘土含量（CC）对其性能有重要影响。本研究提出了一种镁基生物水泥（MBC）原位处理MD固化的方法。这种新方法利用浓缩的细菌溶液在高含水量的MD中直接水解尿素，然后进行活性MgO的生物碳化。制备了含10-70% CC的原位固化MD （mbc -样品），通过研究其力学性能、化学特性和显微组织来验证其可行性，并揭示CC效应。结果表明，原位MBC可以利用其固有的水分水解尿素，有效地固化高含水量的MD，避免了添加菌液进一步增加含水量。CC的增加使无侧限抗压强度（UCS）提高了370.0%至0.94 MPa，但使碳化度（DC，评价水合碳酸镁（HMCs）产量）降低了30.3%至0.31。预水解处理使mbc样品的DC和UCS分别提高了24.4%和177.0%。虽然较高的CC抑制了MD内的尿素水解并减少了hmc的产生，但它减少了孔隙体积和优势孔径，改变了hmc的发育和分布，从而补偿了较低的DC，最终提高了mbc样品的UCS。通过考虑抑制反应降低直流效应和通过减小主导孔径来细化微观结构，定量分析了CC和UCS之间的关系，这些发现为海洋沉积物的可持续凝固提供了理论和实践见解。

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引用次数: 0

Hybrid SDF-CFD-DEM analysis of suffusion behavior in coral sand incorporating irregular particle morphology and intraparticle voids 包含不规则颗粒形态和颗粒内空隙的珊瑚砂中渗透行为的混合SDF-CFD-DEM分析

IF 8.4 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2026-03-26 Epub Date: 2026-02-09 DOI: 10.1016/j.enggeo.2026.108616

Shuai Huang , Pei Wang , Zhengshou Lai , Zhen-Yu Yin , Linchong Huang , Changjie Xu

Coral sand is one of the common marine geomaterials characterized by highly irregular particle morphology and abundant intraparticle voids. The influences of the complex shape and intraparticle voids on the suffusion behavior of coral sand remains insufficiently understood. This work develops a numerical modeling framework that integrates a hybrid resolved and semi-resolved signed distance field (SDF) enhanced computational fluid dynamics (CFD) and discrete element method (DEM) approach for simulating suffusion in coral sand, accounting for both the irregular particle morphology and intraparticle voids. The framework employs the level set (LS) to represent intraparticle voids and spherical harmonics (SH) to capture apparent particle shapes, with a fully resolved scheme for coarse particles and a semi-resolved scheme for fine particles to balance accuracy and computational efficiency. The hybrid CFD-DEM scheme for coral sand is validated through the simulations of particle settling and Ergun’s tests. Comprehensive numerical simulations are performed to evaluate the effects of intraparticle voids and particle shape on the suffusion behavior. The results reveal that intraparticle voids inhibit suffusion by trapping fine particles. In contrast, the simplified spherical particle representations, which is commonly adopted in previous studies, will significantly overestimate fine particle erosion during suffusion processes. Furthermore, a sensitivity analysis is conducted to assess the influence of flow velocity and direction, indicating that increased inlet velocity enhances fines erosion, whereas flow directions deviating from gravity reduce erosion efficiency. These findings highlight the importance of particle morphology and intraparticle voids for accurate prediction of suffusion behavior in coral sand, and the proposed framework provides a reliable analysis tool with high physical fidelity for investigating suffusion mechanisms in complex granular systems.

珊瑚砂是一种常见的海洋岩土材料，具有颗粒形态高度不规则、颗粒内孔隙丰富等特点。珊瑚砂的复杂形状和颗粒内空隙对其渗流行为的影响尚不清楚。这项工作开发了一个数值模拟框架，该框架集成了混合分辨和半分辨签名距离场（SDF）增强计算流体动力学（CFD）和离散元方法（DEM）方法，用于模拟珊瑚砂中的扩散，同时考虑了不规则颗粒形态和颗粒内空隙。该框架采用水平集（LS）来表示粒子内空洞，采用球面谐波（SH）来捕捉粒子的表观形状，对粗颗粒采用全分辨格式，对细颗粒采用半分辨格式来平衡精度和计算效率。通过颗粒沉降模拟和Ergun试验验证了珊瑚砂CFD-DEM混合方案的有效性。通过全面的数值模拟来评估颗粒内空隙和颗粒形状对扩散行为的影响。结果表明，颗粒内空洞通过捕获细颗粒来抑制扩散。相比之下，在以往的研究中通常采用的简化的球形颗粒表示将大大高估扩散过程中的细颗粒侵蚀。此外，对入口速度和方向的影响进行了敏感性分析，结果表明入口速度增大有利于细粒侵蚀，而偏离重力的流动方向则降低了细粒侵蚀效率。这些发现强调了颗粒形态和颗粒内空隙对于准确预测珊瑚砂中扩散行为的重要性，并且所提出的框架为研究复杂颗粒系统中的扩散机制提供了可靠的高物理保真度分析工具。

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引用次数: 0

Chronological development of gravitational slope deformation induced by upstream knickpoint migration 上游裂缝点偏移引起的重力斜坡变形的年代发展

IF 8.4 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2026-03-26 Epub Date: 2026-02-10 DOI: 10.1016/j.enggeo.2026.108605

Masakazu Mashiko , Masahiro Chigira , Hirokazu Furuki , Takehiko Suzuki

Deep-seated gravitational slope deformation is slowly occurring, being affected by long-term river or glacial erosion and climatic change, as well as short-term impacts from precipitation and earthquakes. A geological field survey, high-resolution digital elevation model topographic analysis, drilling, and tephrochronological dating of sediments from the depressions of deep-seated gravitational slope deformation (DGSD) were performed to investigate the structural causes and chronological development of nearly 6-km linearly aligned ridge-top depressions within a Cretaceous accretional complex in the Chichibu area of central Japan. The DGSD occurred on slopes with a low-angle thrust fault that dips downslope, which was gradually exhumed at the riverbed by river erosion caused by the upstream knickpoint migration. The dating of the depression sediments and the characteristics of the ridge-top depressions indicate that the deformation process continued for 200,000 years with typical displacement rates ranging from 0.2 to 0.5 mm per year. The recent short-term rates observed over the past 18 years have been somewhat faster, averaging 0.69 mm per year. This rate discrepancy during the long and short terms might be attributed to the glacial ages during which DGSD could have been decelerated. The prevalence of low-angle thrust faults and DGSDs in Japan's Cretaceous accretional complex suggests that DGSDs exhibiting similar behavior could serve as a reference for such a complex.

深层重力斜坡变形是缓慢发生的，受到长期河流或冰川侵蚀和气候变化的影响，以及降水和地震的短期影响。通过野外地质调查、高分辨率数字高程模型地形分析、钻井和沉积物年代学分析，研究了日本中部秩部地区白垩纪增生杂岩中近6公里线性排列脊顶凹陷的构造成因和年代学发展。逆冲断层发育在低角度逆冲断层下倾的斜坡上，由上游断裂点运移引起的河流侵蚀作用逐渐在河床上掘出。坳陷沉积物测年和脊顶坳陷特征表明，变形过程持续了200000 年，典型位移率为0.2 ~ 0.5 mm /年。在过去的18 年中观测到的近期短期速率略快，平均每年0.69 毫米。这种长期和短期的速率差异可能归因于冰川时代，在此期间DGSD可能已经减速。日本白垩纪增生杂岩中低角度逆冲断层和dgsd的普遍存在表明，dgsd表现出类似的行为可以作为此类杂岩的参考。

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引用次数: 0

Role of sediment entrainment in the flash-flood to debris-flow transition during cascading landslide dam failures 级联滑坡溃坝过程中泥沙夹带在山洪向泥石流过渡中的作用

IF 8.4 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2026-03-26 Epub Date: 2026-02-09 DOI: 10.1016/j.enggeo.2026.108614

Jialin Liu , Gordon G.D. Zhou , Yunxu Xie , Kahlil F.E. Cui , Xueqiang Lu , Ming Peng , Wei Zhong , Giulia Bossi

Intense rainfall can produce rapid inflows that overtop or erode landslide dams, triggering cascading failures that entrain large volumes of sediment. This process rapidly transforms the floods into dense debris flows, whose size and destructive potential grow as they travel downstream. Therefore, understanding the mechanisms of cascading failure is crucial for flood risk assessment and disaster mitigation in mountainous areas. This study uses flume experiments and numerical simulations to investigate the transition of rapid floods into debris flows during the cascading failure of four landslide dams. Results show that successive dam breaches increase sediment entrainment, transforming the initial water flow into a dense debris flow. Numerical simulations incorporating erosion and entrainment reproduce the experimental results and reveal that hydrodynamic parameters—velocity, shear stress, and discharge—can increase by up to threefold after successive dam breaches. This amplification persists even when the upstream reservoir volume is low, sustained by a feedback mechanism in which higher velocity increases shear stress, which accelerates erosion and sediment entrainment. The resulting rise in flow density further enhances shear stress, creating a cycle that amplifies discharge. Conversely, when sediment entrainment is neglected, this positive feedback loop is suppressed, leading to a significant reduction in the amplification effect. These findings enhance our understanding of scale amplification by cascading failure, and provide a scientific basis for debris flow mitigation strategies in mountainous areas.

强降雨会产生快速的水流，淹没或侵蚀滑坡大坝，引发层叠式破坏，带走大量沉积物。这一过程迅速将洪水转变为密集的泥石流，其规模和破坏潜力随着它们向下游移动而增加。因此，了解级联破坏的机制对山区洪水风险评估和减灾至关重要。本文采用水槽试验和数值模拟的方法研究了4座滑坡坝级联破坏过程中快速洪水向泥石流的转变过程。结果表明，连续溃坝增加了泥沙的夹带，使初始水流转变为密集的泥石流。结合侵蚀和夹带的数值模拟再现了实验结果，并揭示了在连续的溃坝后，水动力参数——速度、剪应力和流量——可以增加三倍。即使在上游水库容量较低时，这种放大也会持续存在，这是由一种反馈机制维持的，在这种机制中，较高的流速增加了剪切应力，从而加速了侵蚀和沉积物夹带。由此产生的流体密度的上升进一步增强了剪切应力，形成了一个循环，放大了排放。相反，当泥沙夹带被忽略时，这种正反馈回路被抑制，导致放大效应显著降低。这些发现增强了我们对级联破坏规模放大的认识，并为山区泥石流减灾策略提供了科学依据。

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引用次数: 0

Self-enhancing climatic resilience of surface soil through bio-carbonation constructed barrier 生物碳化构筑屏障对表层土壤气候适应性的自增强作用

IF 8.4 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2026-03-26 Epub Date: 2026-02-09 DOI: 10.1016/j.enggeo.2026.108607

Rui Wang , Chao-Sheng Tang , Guang-Hui Lei , Xiao-Hua Pan , Zhi-Hao Dong , Shao-Dan Wang , Xiancai Lu

The intensification of extreme climatic events has amplified matter and energy exchanges between atmosphere and surface soil, potentially triggering cascades of geological hazards such as slope failure and earthen infrastructure instability. This study, for the first time, proposes the use of bio‑carbonation constructed barrier (bio‑carbonated barrier) to enhance surface soil resilience. Furtherly, we systematically investigated the effect of climatic wet-dry cycles on the long-term performance of bio‑carbonated barrier, focusing on physical (water absorption, WA; ultrasonic pulse velocity, UPV), mechanical (splitting tensile strength, STS), and chemical (pH; ammonia nitrogen concentration, ANC) properties. Integrating carbon capture assessment (total carbonate concentration) with microscopic analysis, the underlying mechanisms are further elucidated. Results show that a single wet-dry cycle causes significant strength loss, but higher MgO content can enhance initial strength and mitigate degradation, primarily due to stronger cementation. As wet-dry cycles proceed, the self-enhancement of weathering resistance is observed, as evidenced by increases in STS and UPV and a decrease in WA. Microanalyses indicate that this effect arises from atmospheric CO₂-driven carbonation and crystal reorganization, which increase both the production and crystallinity of hydrated magnesium carbonates, thereby improving the cementation and densification. Additionally, reductions in pH and ANC of the leachate suggest that wet-dry cycles may help mitigate potential environmental contamination risks associated with the migration of OH⁻ and

{NH}_{4}^{+}

. These findings indicate that the construction of bio‑carbonated barrier can contribute to the self-enhancing climatic resilience of surface soil system, providing an efficient and sustainable strategy for the prevention and mitigation of geohazards under climatic extremes.

极端气候事件的加剧放大了大气和表层土壤之间的物质和能量交换，可能引发诸如边坡破坏和土质基础设施不稳定等地质灾害的级联。本研究首次提出利用生物碳化构筑屏障（bio - carbonated barrier）增强表层土壤弹性。此外，我们系统地研究了气候干湿循环对生物碳酸化屏障长期性能的影响，重点关注物理（吸水率，WA，超声脉冲速度，UPV），机械（劈裂拉伸强度，STS）和化学（pH，氨氮浓度，ANC）性能。结合碳捕获评估（总碳酸盐浓度）和微观分析，进一步阐明了潜在的机制。结果表明，单次干湿循环会导致显著的强度损失，但较高的MgO含量可以提高初始强度并减缓降解，这主要是由于胶结性更强。随着干湿循环的进行，观察到抗风化性的自我增强，如STS和UPV的增加和WA的减少。微观分析表明，这种效应是由大气co2驱动的碳酸化和晶体重组引起的，这增加了水合碳酸镁的产量和结晶度，从而改善了胶结和致密化。此外，渗滤液pH和ANC的降低表明，干湿循环可能有助于减轻与OH -和NH4+迁移相关的潜在环境污染风险。这些结果表明，生物碳化屏障的构建有助于表层土壤系统自我增强的气候恢复力，为极端气候条件下的地质灾害预防和缓解提供了有效和可持续的策略。

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引用次数: 0

A coupled 3D DDA-MPM framework for soil-structure interaction modeling and its application in geotechnical hazards modeling 土-结构相互作用耦合三维DDA-MPM框架及其在岩土灾害建模中的应用

IF 8.4 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2026-03-26 Epub Date: 2026-01-29 DOI: 10.1016/j.enggeo.2026.108591

Hongyun Fan , Yuguang Fu , Wei Shen , Xiangyu Chang

Soil-structure interaction (SSI) is commonly encountered in various geohazards such as landslides and debris flows. To understand and mitigate these hazards, it is essential to simulate the interaction between soil and structures with accuracy. However, existing coupled numerical methods often represent structural motion using particle-based models, which limits their ability to precisely capture the dynamic interaction mechanisms between soil and structures. To address this limitation, this study proposes a novel coupled simulation framework that integrates the three-dimensional Discontinuous Deformation Analysis (3D DDA) with the Material Point Method (3D MPM), leveraging the strengths of 3D DDA in modeling structural motion and the capability of MPM in capturing large deformation of geomaterials. First, a contact detection and force computation scheme between MPM particles and DDA blocks is established by incorporating bounding box techniques and a penalty spring model, enabling accurate simulation of soil–structure interaction processes. Subsequently, the proposed coupling method is applied to simulate a series of benchmark scenarios, including soil collapse, soil collapse with embedded blocks, block impact on soil, and soil impact on blocks. The simulation results are validated against experimental data, demonstrating the accuracy and robustness of the proposed approach. Finally, the coupling method is employed to investigate the collapse behavior of buildings subjected to landslide impact, with a particular focus on the influence of landslide height on structural collapse mechanisms. By clarifying the underlying mechanisms, the findings contribute theoretical knowledge that supports efforts to prevent and mitigate landslide-induced hazards.

土-结构相互作用（SSI）是各种地质灾害中常见的问题，如滑坡和泥石流。为了了解和减轻这些危害，必须准确地模拟土壤和结构之间的相互作用。然而，现有的耦合数值方法通常使用基于颗粒的模型来表示结构运动，这限制了它们精确捕捉土与结构之间动态相互作用机制的能力。为了解决这一限制，本研究提出了一种新的耦合模拟框架，该框架将三维不连续变形分析（3D DDA）与材料点法（3D MPM）相结合，利用3D DDA在模拟结构运动方面的优势和MPM在捕获大变形方面的能力。首先，结合边界盒技术和惩罚弹簧模型，建立了MPM颗粒与DDA块体之间的接触检测和力计算方案，实现了土-结构相互作用过程的精确模拟；随后，将提出的耦合方法应用于模拟一系列基准情景，包括土壤崩塌、嵌埋块体土壤崩塌、块体对土壤的冲击、土壤对块体的冲击。仿真结果与实验数据进行了对比，验证了该方法的准确性和鲁棒性。最后，采用耦合方法研究了滑坡冲击下建筑物的倒塌行为，重点研究了滑坡高度对结构倒塌机制的影响。通过阐明潜在的机制，研究结果为预防和减轻滑坡引起的危害提供了理论知识。

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引用次数: 0