Soils and Foundations最新文献_第7页

Reliability based seismic slope failure assessment of a high concrete face rockfill dam close to an active fault zone 靠近活动断裂带的高面板堆石坝地震边坡破坏可靠度评估

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations

Pub Date : 2025-07-15 DOI: 10.1016/j.sandf.2025.101653

Ugur Safak Cavus , Murat Kilit

This study assesses the earthquake-induced failure risks of the upstream and downstream slopes of a concrete face dam (CFRD), which is under the influence of a nearby active fault, using the reliability-based analysis method. For this purpose, peak ground accelerations (PGAs) that may occur at the dam site were calculated probabilistically and their contribution to the sliding risks of dam slopes was determined in accordance with the conditional probability theorem. Upstream and downstream slopes of CFRDs are usually conventionally designed as 1.3–1.5H:1V and 1.3–1.6H:1V, respectively throughout the world. Such slope design is considered sufficient for almost every case. The findings of this study are fully applicable and very important for the structural design of all concrete-faced rockfill dams (CFRDs) worldwide. Since, the slope design of CFRDs is similar and usually traditionally (1.3–1.5H; 1V for upstream slope and 1.4–1.6H:1V for downstream slope). However, this study proves that only conventional upstream slope design (1.3–1.5H:1V) can be safe for even very high peak ground accelerations (PGAs) occurring due to a nearby active fault, but contrary to expectations, downstream slope of CFRDs cannot be sufficiently safe and maintain its slope sliding safety when PGAs reach high levels. When the critical PGA level is exceeded, the downstream slope carries the risk of losing its stability with high probability, as emphasized in this study. Therefore, this study provides a new design strategy and extremely important information for dam design engineers which is to design a rather flatter downstream slope such as 1 vertical to 1.8–2.0 horizontal or, instead, to design a downstream rockfill berm supporting conventional design if CFRDs are to be built in high seismic hazard potential areas or close to active faults. Suggested such type of designs will be economical and sufficiently safe.

采用基于可靠度的分析方法，对受附近活动断层影响的混凝土面板坝上下游边坡地震破坏风险进行了评估。为此，根据条件概率定理，对坝址可能出现的峰值地加速度（pga）进行了概率计算，并确定了它们对坝坡滑动风险的贡献。在世界范围内，cfrd的上、下游坡度通常分别设计为1.3 ~ 1.5 h:1V和1.3 ~ 1.6 h:1V。这种坡度设计被认为对几乎所有情况都是足够的。研究结果对世界范围内混凝土面板堆石坝的结构设计具有一定的参考价值。由于cfrd的坡度设计相似，通常采用传统的(1.3-1.5H；上游坡1V，下游坡1.4-1.6H:1V)。然而，本研究证明，对于附近活动断层产生的峰值地加速度（pga），只有传统的上游边坡设计（1.3-1.5H:1V）才能保证安全，而与预期相反，当峰值地加速度达到较高水平时，cfrd下游边坡不能足够安全并保持边坡滑动安全。当超过临界PGA水平时，下游边坡具有高概率失稳风险，这是本研究所强调的。因此，本研究为大坝设计工程师提供了一种新的设计策略和极其重要的信息，即设计一个相当平坦的下游斜坡，如1垂直到1.8-2.0水平，或者在地震高发区或靠近活动断层的地区建造cfrd，而不是设计一个支持常规设计的下游堆石护堤。建议这种设计既经济又足够安全。

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引用次数: 0

Behaviour of a sandy silt gold tailings under drained simple shear loading in a torsional shear hollow cylinder apparatus 砂质粉砂金尾矿在排水单剪荷载作用下的扭剪空心圆筒试验研究

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations

Pub Date : 2025-07-14 DOI: 10.1016/j.sandf.2025.101635

Riccardo Fanni , David Reid , Andy Fourie

Experimental results are presented in this technical paper to investigate the mechanisms of plane strain consolidation and drained shearing typical of below slope conditions. Five torsional shear hollow cylinder tests were conducted on a sandy silt gold tailings, where consolidation was performed under at-rest (K₀) conditions, and by applying a horizontal shear stress, while maintaining plane strain conditions. The tests were carried out under drained simple shear conditions (strain controlled) on tailings specimens prepared in loose and dense states and along a constant shear stress drained stress path (stress controlled) on a loose specimen, using an automated computer-controlled testing procedure. The evolution of static stresses in the loose and dense specimens during principal stress rotation, while maintaining plane strain conditions, were examined. These tests provide valuable insights into the behavior of tailings under plane strain conditions, contributing to the calibration of numerical models for slope analysis and more broadly for plane strain problems.

本文给出了典型坡下条件下平面应变固结和排水剪切机理的试验结果。对某砂质粉砂金尾矿进行了5次扭剪空心筒试验，分别在静止（K0）条件下、施加水平剪应力时、保持平面应变条件下进行固结。试验采用计算机自动控制的试验程序，在松散和致密状态下制备的尾矿试样在排水简单剪切条件下（应变控制）进行试验，在松散试样上沿恒定剪切应力排水应力路径（应力控制）进行试验。在保持平面应变条件下，研究了松散和致密试样在主应力旋转过程中静应力的演变。这些试验对尾矿在平面应变条件下的行为提供了有价值的见解，有助于校准边坡分析的数值模型，更广泛地用于平面应变问题。

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引用次数: 0

Shaping force-transfer arch to retain subsurface cavity in coarse sandy ground 粗砂地基中成形传力拱保留地下空腔

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations

Pub Date : 2025-07-14 DOI: 10.1016/j.sandf.2025.101652

Daichi Yokoyama , Masahide Otsubo , Reiko Kuwano

Ground cave-ins, which are the collapse and discontinuous subsidence of the ground surface, are thought to be caused by the expansion and upward movement of subsurface cavities due to fluctuations in the groundwater table or earthquakes. Compared to cohesive clays or plastic silts, cohesionless sands are more vulnerable to cavity formation and subsequent ground cave-ins. With recent technology, such as ground-penetrating radar, geometrical information on cavities, e.g., location and shape, can be detected. In practice, the soil cover thickness-to-cavity width ratio (

H / B

) is often used for risk assessments of cave-ins. However, it is questionable whether

H / B

alone is sufficient for these risk assessments since the mechanical responses, such as the resistance of the remaining soil above the cavity, are not considered. For this reason, the aim of the present contribution is to understand the mechanism underlying the subsurface cavity stability by considering the force transfer around the cavity. Suction measurement, cavity retention, and needle penetration model tests were conducted using various coarse granular materials. The results revealed that suction is essential to preventing cavities from collapsing, and that suction is higher for smaller particles, particles with lower degrees of saturation, and particles with angular shapes and smoother surfaces. In addition to

H / B

, the mechanical interlock from angularity or roughness contributes to cavity stability. Laboratory needle penetration tests revealed the existence of a force-transfer arch between the sound and weakened zones around a cavity, which is related to the cavity stability. Furthermore, the position of the arch is affected not only by

H / B

, but also by the particle characteristics (e.g., friction angle) and cavity roof shape. Therefore, considering the material type and the shape of the cavity roof, along with

H / B

, will lead to enhanced assessments of the cave-in potential of subsurface cavities.

地面塌陷是指地表的塌陷和不连续的下沉，被认为是由于地下水位的波动或地震引起的地下空洞的扩张和向上运动造成的。与粘性粘土或塑性粉砂相比，无粘性砂更容易形成空洞和随后的地面塌陷。利用最近的技术，例如探地雷达，可以探测到空腔的几何信息，例如位置和形状。在实践中，土覆盖厚度-洞腔宽度比（H/B）常用于塌方风险评估。然而，单靠H/B是否足以进行这些风险评估是值得怀疑的，因为没有考虑机械反应，例如空腔上方剩余土壤的阻力。因此，本文的目的是通过考虑空腔周围的力传递来理解地下空腔稳定性的机制。采用不同的粗颗粒材料进行吸力测量、空腔保留和针刺模型试验。结果表明，吸力对防止空腔坍缩至关重要，并且对于较小的颗粒、饱和度较低的颗粒以及棱角形状和表面较光滑的颗粒，吸力更高。除了H/B外，来自角度或粗糙度的机械联锁有助于腔体稳定性。实验室针刺试验表明，在腔体周围的声区和弱区之间存在一个力传递拱，这与腔体的稳定性有关。此外，拱的位置不仅受H/B的影响，还受颗粒特性（如摩擦角）和空腔顶板形状的影响。因此，考虑空区顶板的材料类型和形状，并结合H/B，将有助于加强对地下空区塌陷潜力的评估。

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引用次数: 0

Effects of high pressure on microbiologically induced calcium carbonate precipitation of methane hydrate-bearing sand layers 高压对含甲烷水合物砂层微生物诱导碳酸钙沉淀的影响

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations

Pub Date : 2025-07-07 DOI: 10.1016/j.sandf.2025.101651

Joyce Nakayenga , Toshiro Hata , Alexandra Clarà Saracho , Stuart Kenneth Haigh

Sporosarcina newyorkensis is an indigenous microbe found in sedimentary layers bearing methane hydrates in the oceans around Japan’s main islands. It can survive extremely cold temperatures and precipitate calcium carbonate (CaCO₃). This has led to interest in applying the microbe in microbiologically induced calcium carbonate precipitation (MICP) to improve the properties of the surrounding sand and to facilitate the exploration of methane hydrates. Using the injection method, a large-scale laboratory experiment was conducted in this study on sand columns with a diameter of 60 cm and a height of 70 cm to evaluate the MICP performance of S. newyorkensis under high overburden pressures of 3.5 and 20 MPa. The results indicated that S. newyorkensis can precipitate CaCO₃ at high overburden pressures and reduce the permeability of sand. The unconfined compressive strength and amount of precipitated CaCO₃ were seen to decrease with the distance from the injection well, but they remained sufficient to distances of up to 20 cm. S. newyorkensis was also found to increase the pH level, which would further promote CaCO₃ precipitation and, in turn, lower hydraulic conductivity and stabilize hydrate-bearing sand formations.

纽约孢子虫是一种在日本主要岛屿周围海洋中含有甲烷水合物的沉积层中发现的本土微生物。它可以在极冷的温度下生存，并沉淀碳酸钙（CaCO3）。这引起了人们对在微生物诱导碳酸钙沉淀（MICP）中应用微生物的兴趣，以改善周围砂的性质，并促进甲烷水合物的勘探。本研究采用注砂法，在直径为60 cm、高度为70 cm的砂柱上进行了大型室内试验，评价了3.5 MPa和20 MPa高覆盖层压力下，S. newyorkensis的MICP性能。结果表明，在高覆盖层压力下，newyorkensis可使CaCO3沉淀，降低砂体渗透率。无侧限抗压强度和CaCO3的析出量随着距注入井的距离而减小，但在距注入井20 cm处仍保持充足。研究还发现，S. newyorkensis增加了pH值，这将进一步促进CaCO3的沉淀，从而降低水力导电性，稳定含水合物的砂层。

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引用次数: 0

Suffusion behavior under fluctuated hydraulic gradient conditions focusing on amount and size of soil particles contained in drainage 波动水力梯度条件下的渗流行为主要关注排水中所含土壤颗粒的数量和大小

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations

Pub Date : 2025-07-03 DOI: 10.1016/j.sandf.2025.101600

Taichi Ishimaru , Motoyuki Suzuki , Asahi Komori

Suffusion is the detachment and migration of fine particles through voids connected by the matrices of coarse particles. Although water storage structures are known to be affected by fluctuations in seepage flow, due to fluctuations in the water storage levels brought about by rainfall and agricultural activities, the suffusion behavior when the hydraulic gradient is fluctuated is unclear. In this study, one-dimensional downward water-passing experiments with suffusion were performed using a cylindrical column device, and the changes in the amounts of the discharged water and soil particles, as well as the turbidity of the drainage over time, were examined. The behavior of suffusion was investigated from two viewpoints: the quantitative changes in the amount of discharged drainage and the amount of discharged soil particles due to the progress of suffusion, and the qualitative changes in the particle size composition of the discharged soil particles. A unique feature of this study was the tracing of the changes in the particle size composition of the discharged soil particles from the relationship between the turbidity and the concentration of drainage during suffusion. As a result, it was found that not only the amount of soil particles discharged by suffusion, but also the particle size composition of the discharged soil particles changed under both constant and fluctuated hydraulic gradient conditions.

渗透是细颗粒通过由粗颗粒基质连接的空隙脱离和迁移的过程。虽然已知蓄水结构会受到渗流波动的影响，但由于降雨和农业活动带来的蓄水水位波动，水力梯度波动时的渗流行为尚不清楚。在本研究中，采用圆柱柱装置进行了一维向下扩散进水实验，考察了排放的水和土壤颗粒量以及排水浊度随时间的变化。从渗流过程中排水量和排入土壤颗粒量的量变和排入土壤颗粒粒径组成的质变两个角度研究了渗流行为。本研究的一个独特之处在于，通过浸渍过程中浊度与排水浓度的关系，追踪了排放土壤颗粒粒径组成的变化。结果发现，在恒定和波动水力梯度条件下，不仅渗透排出的土粒量发生了变化，而且排放土粒的粒径组成也发生了变化。

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引用次数: 0

Integrated remediation through solidification and dewatering of contaminated soil from laboratory investigation to in-situ application 从实验室研究到现场应用的污染土壤固化脱水综合修复技术

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations

Pub Date : 2025-07-03 DOI: 10.1016/j.sandf.2025.101602

Tingting Deng , Yongfeng Deng , Hang Liu , Fang Liu , Zhenshun Hong , Xueyu Geng

Solidification/stabilization of heavy metal contaminated soils often falls short of achieving the desired quality due to challenges in effectively controlling mixing uniformity. Optimization of mixing equipment and construction technology is a common way to improve mixing uniformity. However, optimizing mixing equipment has high cost, limited site applicability and limited effect on improving uniformity. To solve the problem, a combined solidification/stabilization - vacuum dewatering technique (SSVD) was proposed, which is to increase the water to binder ratio to make the binder and heavy metal contaminated soils mixed evenly and then immediately vacuum dewatering. Its efficiency was explored through both laboratory experiments and a pilot project. Because zinc is a well-known factor that decreases compressive strength and cementation speed, zinc contaminated soil was studied. The findings indicate that the vacuum dewatering successfully removes water from solidified soils during the initial 12 h of setting and hardening in the field, indicating the feasibility of more water incorporation to raise the mixing workability. Furthermore, it can enhance the microstructure to prevent the migration of pollutant, and extract the heavy metals from the solidified mass by the cation exchanges. After 28 days of curing, laboratory tests showed a 1.9-4.1 times’ increment in strength and a 1.7-17.8 times’ reduction in permeability after dewatering. In the field, these values increase by 1.8 times and decrease by 1.7 times, respectively. The Zn²⁺ observed diffusivity also decreases by 2.0 times after dewatering in the laboratory. Microstructure analysis reveals that the vacuum dewatering significantly reduces the porosity of the solidified matrix, thereby enhancing its integrity. The proposed technology holds potential for the application not only in the solidification/stabilization remediation but also in the soft ground improvement in term of the better workability and homogeneity, stronger densification and capsulation, and less pollutant retention and binder consumption.

由于难以有效控制混合均匀性，重金属污染土壤的固化稳定性往往达不到预期的质量。优化搅拌设备和施工工艺是提高搅拌均匀性的常用方法。但优化搅拌设备成本高，现场适用性有限，提高均匀性效果有限。为了解决这一问题，提出了一种固化/稳定-真空复合脱水技术（SSVD），即提高水胶比，使黏合剂与重金属污染土壤混合均匀，然后立即真空脱水。通过实验室实验和试点项目对其有效性进行了探讨。由于锌是众所周知的降低抗压强度和胶结速度的因素，因此对锌污染土壤进行了研究。研究结果表明，真空脱水在田间凝固硬化初始12 h内成功地去除了固化土中的水分，表明增加水分掺入以提高混合和易性是可行的。此外，它可以增强微观结构，防止污染物的迁移，并通过阳离子交换从凝固体中提取重金属。养护28 d后，室内试验表明，脱水后强度增加1.9 ~ 4.1倍，渗透率降低1.7 ~ 17.8倍。在野外，这些值分别增加1.8倍和减少1.7倍。在实验室脱水后，Zn2+的扩散率也下降了2.0倍。显微组织分析表明，真空脱水显著降低了固化基体的孔隙率，提高了固化基体的完整性。该技术具有较好的和易性和均匀性、较强的致密性和荚膜性、较少的污染物滞留和粘结剂消耗等优点，不仅在固化/稳定修复中具有应用潜力，而且在软土地基改善中也具有应用潜力。

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引用次数: 0

Experiment, modelling, and simulation of rate-dependent stress–strain behaviour of unbound geomaterials 实验，建模，和模拟速率依赖的应力应变行为的非束缚的地质材料

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations

Pub Date : 2025-07-03 DOI: 10.1016/j.sandf.2025.101599

Fumio Tatsuoka , Hervé Di Benedetto

Various trends in rate-dependent stress–strain behaviour caused by the viscous properties of a wide variety of unbound geomaterials that were observed under drained triaxial compression, plane strain compression, direct shear, and one-dimensional compression (i.e., oedometer testing) are summarized referring to those of bound geomaterials and others. The following findings are shown. As the interparticle contact points become more stable and the stability of the particles against rotation increases, the viscous properties become closer to the traditional type, namely, Isotach, whose stress–strain behaviour is determined by the instantaneous irreversible strain rate and whose strength during monotonic loading (ML) at a constant strain rate increases with an increase in the strain rate. A couple of non-traditional (i.e., non-Isotach) types of properties were found with granular materials (GMs) that exhibit noticeable creep deformation, stress relaxation, and changes in stress upon changes in the strain rate. Unbound poorly graded sub-angular to angular GMs exhibit the so-called TESRA type of properties (also called the viscous evanescent type), for which the stress–strain behaviour during ML at a constant strain rate is essentially independent of the strain rate. Unbound poorly graded sub-round to round GMs display the so-called Positive and Negative (P&N) type of properties, for which the strength during ML at a constant strain rate decreases with an increase in the strain rate. The combined type displays intermediate behaviour combining the Isotach and TESRA types of properties. These types of viscous properties are quantitatively characterized by a couple of functions and parameters, and they were incorporated into the non-linear three-component (NTC) model. All the observed trends in rate-dependent stress–strain behaviour are well simulated by the NTC model.

在排水三轴压缩、平面应变压缩、直接剪切和一维压缩（即测径仪测试）下观察到的各种非粘结性岩土材料的粘性特性所引起的速率依赖的应力-应变行为的各种趋势，总结了粘结性岩土材料和其他岩土材料的趋势。结果如下。随着颗粒间接触点的稳定和颗粒抗旋转稳定性的提高，黏性更接近于传统的等压型，即等压型，其应力-应变行为由瞬时不可逆应变速率决定，在恒定应变速率下单调加载（ML）时的强度随着应变速率的增加而增加。在颗粒材料（GMs）中发现了一些非传统（即非等压）类型的性能，它们表现出明显的蠕变、应力松弛和应变速率变化时应力的变化。未结合的差梯度亚角到角GMs表现出所谓的TESRA类型性质（也称为粘性消失类型），其中恒定应变速率下ML期间的应力-应变行为基本上与应变速率无关。未结合的分级差的次圆到圆gm表现出所谓的Positive and Negative （P&；N）型性能，在恒定应变速率下，ML期间的强度随着应变速率的增加而降低。组合类型显示结合了Isotach和TESRA属性类型的中间行为。这些类型的粘性特性通过几个函数和参数进行定量表征，并将其纳入非线性三分量（NTC）模型。NTC模型很好地模拟了所有观察到的速率相关应力-应变行为趋势。

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引用次数: 0

Serviceability performance of piled raft foundations under vertical loads in clayey and sandy soils 粘性和砂质土中桩筏基础在竖向荷载作用下的使用性能

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations

Pub Date : 2025-07-02 DOI: 10.1016/j.sandf.2025.101650

Der-Wen Chang , Shih-Hao Cheng , Wei-Cheng Zheng , Chan-Yen Tseng , Louis Ge

This study investigated the serviceability performance of piled raft foundations (or combined pile-raft foundations, CPRF) in various soils using three-dimensional (3D) finite element analysis. The piled raft foundation was assumed to be embedded respectively in homogeneous clayey soils and sandy soils under vertical loading. The displacements and reactions of the piles were carefully observed. In comparing the influences of soil stiffness, raft width, pile-to-pile spacing distance, and pile length, it was found that the embedment depth of the foundation could significantly affect the serviceability of the piles. For embedment depths ranging from 0 m to 12 m, the pile loads can be reduced by approximately 40 % to 60 % of the foundation load, depending on the number of piles involved. The displacements of piled raft foundations in clays decrease with increased embedment depth. However, the effects of embedment depth on foundation displacements are smaller in sands. Furthermore, the load ratio of the piles and the displacement ratio of the CPRF were calculated to demonstrate their dependence on the slenderness ratio of the piles and the number of piles. Both ratios aligned with the guidelines the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE) proposed for CPRF systems. Notably, attention is drawn to the depth of raft embedment, as it significantly influences pile responses.

本文采用三维有限元分析方法，研究了桩筏基础（或桩筏组合基础，CPRF）在不同土体中的使用性能。假定桩筏基础在竖向荷载作用下分别埋置于均质粘土和砂质土中。仔细观察了桩的位移和反力。通过对比土体刚度、筏板宽度、桩间距、桩长等因素的影响，发现基础埋深对桩的使用性能有显著影响。对于0米至12米的埋深，桩荷载可减少约40%至60%的基础荷载，具体取决于所涉及的桩数。土体中桩筏基础的位移随埋深的增加而减小。而在砂土中，埋深对地基位移的影响较小。计算了桩的荷载比和CPRF的位移比，证明了它们与桩长细比和桩数的关系。这两个比率都符合国际土力学与岩土工程学会（ISSMGE）为CPRF系统提出的指导方针。值得注意的是，筏板嵌入的深度引起了人们的注意，因为它对桩的响应有很大的影响。

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引用次数: 0

An approach for predicting earthquake-induced permanent displacements of embedded cantilever walls in soils with cohesion 含黏聚土中预埋悬臂墙地震永久位移预测方法

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations

Pub Date : 2025-06-30 DOI: 10.1016/j.sandf.2025.101649

Luigi Pugliese, Antonello Troncone, Andrea Parise, Enrico Conte

Prediction of the earthquake-induced permanent displacements of retaining structures is a key step in the context of a performance-based design approach. For retaining walls with shallow foundations, this issue is usually dealt with using the well-known Newmark sliding block method. However, several studies have shown that this method is unsuitable to provide a trustworthy prediction of the permanent displacements undergone by the embedded cantilever retaining walls under seismic loading. To overcome this drawback, a new method of practical interest is proposed in the present study for a prediction of the earthquake-induced permanent displacement of these structures. In such a method, the wall movements are evaluated solving a simple equation of motion whenever the ground acceleration exceeds a critical value. This latter value is updated during the seismic event by calculating the forces acting on the wall by means of a closed form solution recently derived by the authors. The method is simple to use and requires few conventional parameters as input data. These features make it suitable for current applications. To assess the predictive capability of the present method, comparisons with the results of a centrifuge test documented in the literature and with those of a large number of ideal case studies solved using a finite element code, are presented. The effectiveness of some measures to reduce the wall displacements is also discussed.

在基于性能的设计方法中，地震引起的挡土结构永久位移的预测是关键的一步。对于基础较浅的挡土墙，通常采用著名的纽马克滑块法进行处理。然而，一些研究表明，这种方法不适合为地震荷载作用下预埋悬臂挡土墙的永久位移提供可靠的预测。为了克服这一缺点，本研究提出了一种实用的新方法来预测这些结构的地震引起的永久位移。在这种方法中，当地面加速度超过一个临界值时，墙体的运动是通过求解一个简单的运动方程来评估的。后一个值在地震事件期间通过计算作用在墙壁上的力，通过作者最近导出的封闭形式解来更新。该方法使用简单，需要的常规参数很少。这些特性使其适合当前的应用。为了评估本方法的预测能力，与文献中记录的离心机测试结果以及使用有限元代码解决的大量理想案例研究的结果进行了比较。讨论了减小墙体位移的一些措施的有效性。

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引用次数: 0

Seepage pressure distribution of gas jet flow in loess 黄土中气体射流渗流压力分布

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations

Pub Date : 2025-06-26 DOI: 10.1016/j.sandf.2025.101648

Changhui Gao , Songyu Liu , Guangyin Du , Mei Bai , Yankai Wu , Runmin Hao

This study aims to investigate the permeation mechanisms and pressure distribution of gas jets in collapsible loess during pneumatic-vibratory probe compaction (PVPC). Indoor model tests were performed to analyze the behavior of continuous gas jet injection, and a seepage pressure distribution model was developed to characterize gas flow in unsaturated loess. The results show that pulsating gas jets disrupt the soil structure near the nozzle, enabling gas penetration driven by internal pressure differentials and leading to the gradual formation of continuous fractures. Gas pressure measurements at the opposite end of the soil layer indicate an initial pressure rise that stabilizes over time, with thinner soil layers showing more pronounced responses. The proposed model effectively captures the dynamic behavior of gas flow, illustrating a rapid decline in seepage pressure over time and a slow increase in seepage distance. These findings enhance the understanding of gas jet permeation and provide practical guidance for optimizing PVPC parameters, further advancing its application in loess foundation improvement within geotechnical engineering.

研究了湿陷性黄土在气振探测压实过程中气体射流的渗透机理和压力分布。通过室内模型试验分析了气体连续喷射的特性，建立了非饱和黄土中气体流动的渗流压力分布模型。结果表明：脉动气体射流破坏了喷口附近的土体结构，使气体在内部压差的驱动下穿透，逐渐形成连续裂缝；在土层另一端的气体压力测量表明，随着时间的推移，初始压力上升趋于稳定，土层越薄，反应越明显。该模型有效地捕捉了气体流动的动态特性，显示了渗流压力随时间的快速下降和渗流距离的缓慢增加。这些研究结果增强了对气体射流渗透的认识，为优化PVPC参数提供了实践指导，进一步推进了其在岩土工程中黄土地基加固中的应用。

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引用次数: 0