Engineering Geology最新文献_第3页

An efficient bio-stabilization technology with bio‑carbonation of reactive magnesia for soil improvement in cold regions 利用生物碳化活性氧化镁改良寒冷地区土壤的高效生物稳定技术

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2024-10-30 DOI: 10.1016/j.enggeo.2024.107779

Rui Wang , Chao-Sheng Tang , Xiao-Hua Pan , Dian-Long Wang , Zhi-Hao Dong , Xiancai Lu

Low curing temperature conditions (5–15 °C) in cold regions pose major challenges for soil improvement using conventional binders, underscoring the urgent need for solutions to enhance soil strength and ensure engineering safety. This study investigated the feasibility and temperature-dependent behaviors of bio‑carbonation of reactive magnesia (BCRM) technology for soil improvement in cold regions. Unconfined compressive strength tests were conducted to explore the effects of curing temperature (T) and curing age (t) on strength enhancement. Combined with macro- (water content and dry density) and micro- (mineral composition and microstructure) analysis, the underlying mechanisms were elucidated. Experimental results showed that low T retarded the bio‑carbonation reaction of reactive magnesia, resulting in longer t required to obtain stable ultimate strength. However, despite lower increase rates, bio‑carbonized samples achieved higher ultimate strength and secant modulus at lower T. It was primarily attributed to the preferential formation of hydrated magnesia carbonates with higher content and crystallinity at low T, which enhanced the bridging and bonding performance. Comparative analyses with ordinary Portland cement (OPC) highlighted the superior efficiency of BCRM technology in stabilizing soil at low T, showing higher ultimate strength and shorter curing age. Notably at 5 °C, the ultimate strength of the bio‑carbonized sample cured for 12 days was up to 2.94 times that of the OPC-reinforced sample cured for 28 days. This study provides an efficient solution for soil improvement in low-temperature conditions. It is expected to enhance soil stability and hold significant implications for preventing and mitigating geological and geotechnical risks associated with soil deterioration in cold region engineering.

寒冷地区的低固化温度条件（5-15 °C）对使用传统粘结剂进行土壤改良构成了重大挑战，这就迫切需要解决方案来提高土壤强度并确保工程安全。本研究调查了生物碳化活性氧化镁（BCRM）技术用于寒冷地区土壤改良的可行性和随温度变化的行为。通过无收缩抗压强度试验，探讨了固化温度（T）和固化龄期（t）对强度提高的影响。结合宏观（含水量和干密度）和微观（矿物成分和微观结构）分析，阐明了潜在的机理。实验结果表明，低 T 会延缓活性氧化镁的生物碳化反应，导致获得稳定极限强度所需的 t 更长。这主要是由于在低 T 条件下，水合菱镁碳酸盐的含量和结晶度更高，从而提高了桥接和粘结性能。与普通硅酸盐水泥（OPC）的对比分析表明，BCRM 技术在低温度下稳定土壤方面具有更高的效率，显示出更高的极限强度和更短的固化龄期。值得注意的是，在 5 °C 下，固化 12 天的生物碳化样品的极限强度是固化 28 天的 OPC 加固样品的 2.94 倍。这项研究为低温条件下的土壤改良提供了一种有效的解决方案。它有望增强土壤稳定性，对预防和减轻寒冷地区工程中与土壤退化相关的地质和岩土工程风险具有重要意义。

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引用次数: 0

Hypermobility of a Catastrophic Earthquake-Induced Loess Landslide 灾难性地震引发的黄土滑坡的超流动性

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2024-10-29 DOI: 10.1016/j.enggeo.2024.107777

Shihao Xiao , Limin Zhang , Jian He , Ming Peng , Ruochen Jiang , Wenjun Lu

Landslide mobility refers to how far and fast a landslide can move downslope. It controls landslide impact areas and damage power. Highly mobile landslides are often initiated on slopes steeper than 30°. However, on 18 December 2023, an earthquake-induced landslide (35°52′54″N, 102°51′10″E) exhibited extraordinary mobility, with an overall travel angle of 1.5°, breaking an on-land landslide record. The landslide originated on a gentle slope (3.6°), eroded an earth dam along its travel path, and finally destroyed 51 houses and claimed 20 lives. Remote sensing and field surveys were conducted to provide morphological characteristics of the hazard chain. A numerical program, EDDA (Erosion–Deposition Debris Flow Analysis), was employed to reproduce the flow dynamics and investigate the causes of hypermobility. The findings reveal three primary causes of hypermobility: (1) liquefaction of the saturated silty loess stratum due to the combined effects of irrigation activity and seismic loading, (2) the loose and macro-pore structure of loess, and (3) confined topography and icy channel bed. The mechanisms revealed have broad implications for understanding fluidized mass movements on gentle slopes in seismically active regions.

滑坡流动性是指滑坡向下移动的距离和速度。它控制着滑坡的影响范围和破坏力。高流动性滑坡通常发生在陡于 30° 的斜坡上。然而，在 2023 年 12 月 18 日，由地震引发的山体滑坡（北纬 35°52′54″，东经 102°51′10″）表现出了超常的移动性，整体移动角度达到 1.5°，打破了陆地山体滑坡的记录。滑坡起源于一个缓坡（3.6°），沿途侵蚀了一个土坝，最终摧毁了 51 栋房屋，造成 20 人死亡。通过遥感和实地调查，提供了灾害链的形态特征。研究人员采用了一个名为 EDDA（侵蚀-沉积泥石流分析）的数值程序来重现泥石流的流动动态，并对造成泥石流超流动的原因进行了研究。研究结果揭示了造成高流动性的三个主要原因：(1) 灌溉活动和地震荷载的共同作用导致饱和淤泥质黄土地层液化，(2) 黄土的疏松和大孔隙结构，以及 (3) 局促的地形和冰冷的河床。所揭示的机理对于理解地震活跃地区缓坡上的流化质运动具有广泛的意义。

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引用次数: 0

A slope stability analysis method considering the rainfall hydrology process 考虑降雨水文过程的斜坡稳定性分析方法

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2024-10-28 DOI: 10.1016/j.enggeo.2024.107775

Jun-Hao Wang , Wen-Jie Xu , Xiao-Xiao Liu

Rainfall is one of the major factors inducing landslides. Stability analysis of the slope under the rainfall process is very important for disaster prevention and control. As a hybrid Lagrangian-Eulerian computational method, the material point method (MPM) is highly suitable for simulating the large deformation processes of geomaterials. By using a GPU-based MPM software (CoSim-MPM), a novel coupling method between the rainfall hydrology process and geomechanics is provided to analyze the influence of the rainfall on slope stability. The provided method considers both the influence of surface runoff and infiltration during the rainfall, and is able to simulate the whole process of water migration, deformation and failure of the slope. To perform the quantitative analysis of slope stability during the rainfall process, the strength reduction method (SRM) is introduced. And Qianling slope, Beijing, China, is taken as an application example, which was unstable during an intense rainfall in 2023. Based on the numerical results and field investigations, the mechanisms of slope deformation and failure under rainfall is analyzed. The results indicate that the provided method has robust advantages and efficiency in slope stability analysis during the rainfall, which can give an intuitive and comprehensive simulation of the entire process of slope deformation and failure.

降雨是诱发山体滑坡的主要因素之一。降雨过程下的边坡稳定性分析对于灾害防治非常重要。作为一种拉格朗日-欧拉混合计算方法，材料点法（MPM）非常适合模拟土工材料的大变形过程。通过使用基于 GPU 的 MPM 软件（CoSim-MPM），提供了一种降雨水文过程与地质力学之间的新型耦合方法，用于分析降雨对边坡稳定性的影响。所提供的方法同时考虑了降雨过程中地表径流和渗透的影响，能够模拟边坡的水迁移、变形和破坏的全过程。为了对降雨过程中的边坡稳定性进行定量分析，引入了强度降低法（SRM）。以中国北京的前岭边坡为例，该边坡在 2023 年的强降雨过程中出现不稳定。基于数值结果和实地调查，分析了降雨作用下边坡变形和破坏的机理。结果表明，所提供的方法在降雨过程中的边坡稳定性分析中具有强大的优势和效率，可以直观、全面地模拟边坡变形和破坏的全过程。

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引用次数: 0

Insight into failure mechanisms of rainfall induced mudstone landslide controlled by structural planes: From laboratory experiments 洞察受结构平面控制的降雨诱发泥岩滑坡的破坏机制：来自实验室实验

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2024-10-24 DOI: 10.1016/j.enggeo.2024.107774

Kun Li , Ping Sun , Haojie Wang , Jian Ren

The role of structural planes in controlling mudstone landslides is a key issue in the study of geo-disasters in the Loess Plateau of China. In this study, the effects of sliding-control structures on the mechanisms of mudstone landslides are investigated via three model experiments with different slope structures. The results show that the hydrological response and failure mode of the experimental slope vary with the structural conditions. The vertical joints serve as preferential seepage paths, which accelerate rainfall infiltration, resulting in earlier responses of volumetric water content and pore water pressure. With the incorporation of vertical joints, the slope failure mode tends to transform from shallow failure to deep-seated failure. The presence of a weak interlayer leads to significant increases in the velocity and runout of the sliding mass. The variation in the slope failure extent and deformation characteristics with varying sliding-control structures further changes the temporal and spatial distributions of volumetric water content and pore water pressure. The different slope failure modes correspond to different sliding-control mechanisms, which are dominated by the types of structural planes and their interactions with hydrological responses. In the action of these mechanisms, pore water pressure and seepage force play significant roles in the reduction of effective stress and shear strength.

结构平面在控制泥岩滑坡中的作用是中国黄土高原地质灾害研究中的一个关键问题。本研究通过三个不同边坡结构的模型试验，研究了滑动控制结构对泥岩滑坡机理的影响。结果表明，实验边坡的水文响应和破坏模式随结构条件的变化而变化。垂直节理是优先渗流通道，可加速降雨渗透，从而使体积含水量和孔隙水压力的响应提前。加入垂直节理后，边坡的破坏模式往往会从浅层破坏转变为深层破坏。软弱夹层的存在会导致滑动体的速度和跳动显著增加。随着滑动控制结构的变化，边坡破坏范围和变形特征的变化进一步改变了体积含水量和孔隙水压力的时空分布。不同的斜坡破坏模式对应不同的滑动控制机制，这些机制主要由结构平面的类型及其与水文反应的相互作用决定。在这些机制的作用下，孔隙水压力和渗流力在降低有效应力和抗剪强度方面发挥了重要作用。

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引用次数: 0

Evaluating the thresholds for predicting post-earthquake debris flows: Comparison of meteorological, hydro-meteorological and critical discharge approaches 评估预测震后泥石流的临界值：气象、水文气象和临界排放方法的比较

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2024-10-21 DOI: 10.1016/j.enggeo.2024.107773

Zhen-lei Wei, Xuan-mei Fan, Jie Yang, Zong-shuo Zhang, Cheng-bin Zou

Post-earthquake debris flows pose significant hazards in mountainous regions following large seismic events. Evaluating the thresholds for predicting the occurrence of these flows is crucial. However, the absenting of comparison for different predicting methods hampers progress in improving and updating predictions for debris flows. In this study, based on on-site measurements of post-earthquake debris flows in an active catchment during the first year following the 2022 Luding Ms6.8 earthquake, 30 debris-flow events were identified and observed. We established and compared three distinct methods—namely, the meteorological approach, the hydro-meteorological approach, and the critical discharge approach for predicting the occurrence of post-earthquake debris flows. Additionally, we introduced a factor called absolute energy to improve the accuracy of the traditional meteorological approach. Absolute energy is defined as the sum of squared values within a time series. Our findings indicate that the hydro-meteorological model outperforms others in predicting post-earthquake debris flows, whereas the meteorological approaches especially the intensity–duration (I–D) thresholds exhibit suboptimal performance. Furthermore, the updated meteorological model incorporating absolute energy demonstrates improved predictive capability compared to traditional meteorological approaches like intensity–duration (I–D) thresholds. We argue that this comparative analysis will aid in selecting the suitable method for predicting post-earthquake debris flows.

大地震发生后，震后泥石流会对山区造成严重危害。评估预测这些泥石流发生的阈值至关重要。然而，由于缺乏对不同预测方法的比较，阻碍了对泥石流预测的改进和更新。在本研究中，基于 2022 年泸定 Ms6.8 级地震后第一年在一个活跃集水区对震后泥石流的现场测量，确定并观测了 30 次泥石流事件。我们建立并比较了三种预测震后泥石流发生的不同方法，即气象方法、水文气象方法和临界排泄方法。此外，我们还引入了一个称为绝对能量的因子，以提高传统气象方法的准确性。绝对能量的定义是时间序列中的平方值之和。我们的研究结果表明，水文气象模型在预测震后泥石流方面优于其他模型，而气象方法，尤其是强度-持续时间（I-D）阈值则表现不佳。此外，与烈度-持续时间（I-D）阈值等传统气象方法相比，包含绝对能量的最新气象模型显示出更强的预测能力。我们认为，这种比较分析将有助于选择合适的方法来预测震后泥石流。

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引用次数: 0

Frozen and unfrozen moisture content estimation in coral calcareous sand during artificial freezing 人工冻结过程中珊瑚钙质砂中冻结和未冻结水分含量的估算

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2024-10-19 DOI: 10.1016/j.enggeo.2024.107770

Dingfeng Cao , Hong-hu Zhu , Wu Zhu , Zhixia Liu , He Wang , Jinghong Wu

In tropical areas where coral calcareous sands are prevalent, artificial freezing techniques are frequently employed during construction. However, the fundamental thermodynamic behaviors and moisture dynamics of calcareous sands under freezing conditions are poorly understood. Therefore, we conducted laboratory tests and developed a numerical model to capture the total moisture, liquid water, and ice contents of calcareous sand during artificial freezing. The thermal fiber Bragg grating (T − FBG) and frequency − domain reflectometry methods were used in the study. Freezing characteristic curves were quantitatively analyzed with taking into account the initial moisture content and ambient temperature. The results indicate that T − FBG effectively estimates the total moisture content in unfrozen and frozen calcareous sand, as well as ice content in frozen soil, with less than 0.029 m³/m³ error. Ice melting induced by T − FBG heating is affected by the initial moisture content, heating duration, power, and ambient temperature. However, the maximum change is below 0.008 m³/m³, which is negligible. The van Genuchten model accurately describes the liquid moisture–temperature relationship of unsaturated calcareous sand, with an R² exceeding 0.98. The residual–initial moisture content relationship follows a quadratic function. During freezing, the temperature reduction aligns with the Kozlowski model, and the liquid moisture–temperature relationship follows a cubic polynomial function.

在盛产珊瑚钙质砂的热带地区，施工过程中经常会采用人工冷冻技术。然而，人们对钙质砂在冻结条件下的基本热力学行为和水分动态了解甚少。因此，我们进行了实验室测试，并开发了一个数值模型来捕捉人工冷冻过程中钙质砂的总水分、液态水和冰含量。研究中使用了热光纤布拉格光栅（T - FBG）和频域反射仪方法。考虑到初始含水量和环境温度，对冻结特性曲线进行了定量分析。结果表明，T - FBG 能有效估算未冻结和冻结钙质砂中的总含水量以及冻结土壤中的含冰量，误差小于 0.029 立方米/立方米。T - FBG 加热引起的冰融化受初始含水量、加热持续时间、功率和环境温度的影响。不过，最大变化低于 0.008 立方米/立方米，可以忽略不计。van Genuchten 模型准确地描述了非饱和钙质砂的液体湿度-温度关系，R2 超过 0.98。残余-初始含水量关系遵循二次函数。在冻结过程中，温度降低与 Kozlowski 模型一致，液体湿度-温度关系遵循三次多项式函数。

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引用次数: 0

Rayleigh wave ellipticity from ambient noise: A practical method for monitoring seismic velocity variations in the near-surface 来自环境噪声的瑞利波椭圆度：监测近地表地震速度变化的实用方法

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2024-10-19 DOI: 10.1016/j.enggeo.2024.107768

Helena Seivane , Martin Schimmel , David Martí , Pilar Sánchez-Pastor

This study explores the feasibility and limitations of using Rayleigh wave (Rg) ellipticity for noise-based seismic monitoring at near-surface depths (4–70 m). We use the degree of polarization (DOP) method to extract the Rayleigh wave ellipticity from seismic noise recordings, employing normalized cross-correlation and cross-covariance coefficients to quantify ellipticity variations over time. Synthetic models and field data from three distinct case studies—Garner Valley, California; Riotinto mine, Spain; and the 2011 submarine volcanic eruption on El Hierro Island, Canary Islands—validate our approach. In these field applications, our method effectively tracks the seasonality of the shallow groundwater levels in Garner Valley, monitors pore pressure variations at the tailings dam of Riotinto mine, and detects volcanic induced changes on El Hierro, demonstrating robust performance even with variable noise sources. Our results indicate that Rayleigh wave ellipticity is a versatile tool for subsurface monitoring, capable of detecting velocity changes across a broad depth range. Our methodology represents a new independent and non-interferometric approach that enhances the detection of subsurface changes while improving resolution and exploration depth in seismic monitoring techniques.

本研究探讨了将瑞利波（Rg）椭圆度用于近地表深度（4-70 米）基于噪声的地震监测的可行性和局限性。我们使用极化度（DOP）方法从地震噪声记录中提取瑞利波椭圆度，利用归一化交叉相关和交叉协方差系数量化椭圆度随时间的变化。来自三个不同案例研究的合成模型和现场数据--加利福尼亚州的加纳谷、西班牙的 Riotinto 矿和 2011 年加那利群岛埃尔希耶罗岛的海底火山爆发--验证了我们的方法。在这些实地应用中，我们的方法有效地跟踪了加纳谷浅层地下水水位的季节性变化，监测了 Riotinto 矿尾矿坝的孔隙压力变化，并检测了 El Hierro 岛火山诱发的变化，即使在噪声源可变的情况下也表现出了强大的性能。我们的研究结果表明，瑞利波椭圆度是一种多用途的地下监测工具，能够在广泛的深度范围内探测速度变化。我们的方法代表了一种新的独立非干涉测量方法，可增强对地下变化的探测，同时提高地震监测技术的分辨率和勘探深度。

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引用次数: 0

Can satellite InSAR innovate the way of large landslide early warning? 卫星 InSAR 能否创新大型滑坡预警方式？

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2024-10-18 DOI: 10.1016/j.enggeo.2024.107771

Peng Zeng, Bing Feng, Keren Dai, Tianbin Li, Xuanmei Fan, Xiaoping Sun

Predicting landslide failure times is an essential component in landslide risk management. Although in-situ sensor-supported landslide early warning systems are still predominantly used, their high cost makes it impractical to monitor all the landslides, thereby posing a major challenge for the effective landslide risk management. Hence, this study investigated this problem from an earth observation perspective and proposed a probabilistic landslide failure time prediction framework integrating Interferometric Synthetic Aperture Radar (InSAR) monitoring information. Accordingly, 30 historical landslides that occurred between 2016 and 2021 in central and western China were collected to evaluate the feasibility of the aforementioned framework. Based on the landslide dataset, the performance of the satellite InSAR technology for landslide failure time prediction is evaluated systematically from an application perspective. It was evident that eleven landslides (36.67 %) were captured by InSAR with accelerated deformation signals before failure, and monitoring data from eight (26.67 %) of them provided enough information for their failure time prediction. Further, a probabilistic method integrating the conventional inverse velocity model and sequential Bayesian updating was proposed to dynamically predict the most likely failure time and related confidence interval. Case studies showed that the proposed method could successfully predict the failure time of the eight landslides, thus demonstrating the feasibility of the framework. Although the current long revisit period of satellites constrains their performance practically, this problem can be solved by advancements in future satellite missions. Thus, we believe that the InSAR era is imminent and will bring substantial values for large landslide early warning.

预测滑坡破坏时间是滑坡风险管理的重要组成部分。虽然原地传感器支持的滑坡预警系统仍被广泛使用，但其高昂的成本使得对所有滑坡进行监测变得不切实际，从而对有效的滑坡风险管理提出了重大挑战。因此，本研究从地球观测的角度对这一问题进行了研究，并提出了一个整合干涉合成孔径雷达（InSAR）监测信息的概率滑坡破坏时间预测框架。为此，研究人员收集了 2016 年至 2021 年期间发生在中国中西部地区的 30 次历史滑坡数据，以评估上述框架的可行性。基于滑坡数据集，从应用角度系统评估了卫星 InSAR 技术在滑坡破坏时间预测方面的性能。结果表明，11 个滑坡（36.67%）在崩塌前被 InSAR 捕获到加速变形信号，其中 8 个滑坡（26.67%）的监测数据为其崩塌时间预测提供了足够的信息。此外，还提出了一种概率方法，该方法综合了传统的反向速度模型和序列贝叶斯更新，可动态预测最可能的故障时间和相关置信区间。案例研究表明，所提出的方法可以成功预测八处滑坡的破坏时间，从而证明了该框架的可行性。虽然目前卫星的重访周期较长，限制了其实际性能，但这一问题可以通过未来卫星任务的进步来解决。因此，我们相信 InSAR 时代即将到来，并将为大型滑坡预警带来巨大价值。

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引用次数: 0

Surface weathering of the cliff at Bingling Temple Grottoes: A cultural relic on the Bank of Reservoir in NW China 炳灵寺石窟悬崖表面风化：中国西北部水库岸边的一处文化遗迹

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2024-10-18 DOI: 10.1016/j.enggeo.2024.107767

Qian Xia , Wenwu Chen , Yimin Tang , Liufang Li , Li Wang , Peiran Liu , Shaoran Zhang

The world cultural heritage Bingling Temple Grottoes (BTG) is a typical sandstone cultural relic on the bank of Liujiaxia Reservoir in the semi-arid region of northwest China. After the construction of the Liujiaxia Reservoir, the changes in the hydrogeological and climatic conditions in the small region have accelerated the weathering process of the cliff bottom. However, the influence of the water reservoir on rock surface weathering remains further understanding. In this study, we quantified the degree of surface weathering of a representative cliff in the BTG. Several typical in-situ tests were carried out, including peeling test, hardness test, and ultrasonic measurement, further supplemented by X-ray diffraction analysis. Despite good correlation among indices for the same lithology, the test results were insufficient for cross-lithology weathering evaluation. Consequently, the modified TOPSIS method was introduced to evaluate weathering across different strata. TOPSIS scores reveal altitude-related variations in weathering degree. Overall, the surface weathering degree of the cliff intensifies from top to bottom. The upper section (> 1743 m) of the cliff is primarily mechanically damaged, in contrast to the bottom layer (influenced by reservoir water level changes), which exhibits severe deterioration and intense chemical weathering related to water. Our study provides experience and methodological reference to the preservation of cultural relics and enhances the understanding of surface weathering of stone heritages on the bank of the reservoir in the semi-arid region of NW China.

世界文化遗产炳灵寺石窟（BTG）位于中国西北半干旱地区的刘家峡水库畔，是一处典型的砂岩文化遗迹。刘家峡水库建成后，小区域内水文地质和气候条件的变化加速了崖底的风化过程。然而，水库对岩石表面风化的影响仍有待进一步了解。在这项研究中，我们对 BTG 中具有代表性的悬崖的表面风化程度进行了量化。我们进行了几种典型的原位测试，包括剥离测试、硬度测试和超声波测量，并辅以 X 射线衍射分析。尽管同一岩性的各项指数之间具有良好的相关性，但测试结果不足以进行跨岩性风化评估。因此，引入了改进的 TOPSIS 方法来评估不同地层的风化情况。TOPSIS 分数揭示了风化程度与海拔相关的变化。总体而言，悬崖表面的风化程度自上而下加剧。悬崖上部（1743 米）主要是机械损伤，而底层（受水库水位变化影响）则与水有关，表现出严重的退化和强烈的化学风化。我们的研究为文物保护提供了经验和方法参考，并加深了对中国西北半干旱地区水库岸边石质文物表面风化的理解。

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引用次数: 0

Efficient Bayesian updating for deformation prediction of high rock slopes induced by excavation with monitoring data 利用监测数据对开挖引起的高岩层边坡变形进行高效贝叶斯更新预测

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology

Pub Date : 2024-10-17 DOI: 10.1016/j.enggeo.2024.107772

Dian-Qing Li , Hang-Hang Zang , Xiao-Song Tang , Guan Rong

This study develops an efficient Bayesian updating method with monitoring data for predicting the deformation of high rock slopes induced by excavation. The importance ranking based on random forest is introduced to identify the key rock parameters as random variables in the Bayesian updating. The surrogate models using support vector machine are constructed to approximate the physical numerical models using FLAC3D for evaluating slope deformation. A practical example involving deformation prediction of the excavated left-bank rock slope for the well-known Baihetan hydropower station in southwest China is presented. The results indicate that the developed Bayesian updating method can efficiently and accurately update the posterior distributions of rock parameters and predict the deformation of high rock slopes induced by excavation. Incorporating the monitoring data of displacement into the Bayesian updating can effectively reduce the uncertainty of rock parameters and displacement prediction. As a result, the displacement predictions made by the Bayesian updating are closer to the monitoring data than the prior displacement predictions. In addition, incorporating more monitoring data of displacement from the previous excavation stages produces more accurate displacement predictions for subsequent excavation stages.

本研究利用监测数据开发了一种高效的贝叶斯更新方法，用于预测开挖引起的高岩层边坡变形。在贝叶斯更新中，引入了基于随机森林的重要性排序，以确定作为随机变量的关键岩石参数。使用支持向量机构建了代用模型，以近似使用 FLAC3D 评估边坡变形的物理数值模型。以中国西南著名的白鹤滩水电站开挖左岸岩石边坡的变形预测为例进行了介绍。结果表明，所开发的贝叶斯更新方法能够高效、准确地更新岩石参数的后验分布，并预测开挖引起的高岩石边坡变形。将位移监测数据纳入贝叶斯更新方法，可有效降低岩石参数和位移预测的不确定性。因此，贝叶斯更新法得出的位移预测结果比先前的位移预测结果更接近监测数据。此外，将更多前一挖掘阶段的位移监测数据纳入贝叶斯更新方法，可为后续挖掘阶段提供更准确的位移预测。

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引用次数: 0