Bulletin of Engineering Geology and the Environment最新文献_第10页

Excavation deformation characteristics of underground caverns across fault fracture zone: a case study at Baihetan hydropower station 跨断层破碎带地下洞室开挖变形特征：白鹤滩水电站案例研究

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-22 DOI: 10.1007/s10064-024-03949-7

Yong Fan, Wenzhuo Li, Guangdong Yang, Xingxia Wang, Bin Tian, Xiaochun Lu

{"title":"Excavation deformation characteristics of underground caverns across fault fracture zone: a case study at Baihetan hydropower station","authors":"Yong Fan, Wenzhuo Li, Guangdong Yang, Xingxia Wang, Bin Tian, Xiaochun Lu","doi":"10.1007/s10064-024-03949-7","DOIUrl":"10.1007/s10064-024-03949-7","url":null,"abstract":"<div><p>The right bank plant of Baihetan Hydropower Station has exposed C<sub>4</sub>, C<sub>5</sub>, and other fault fracture zones (FFZs), thereby increasing rock mass instability. In this paper, the effects of the number and location of FFZ on rock mass deformation were analyzed using field monitoring data. In addition, a validated numerical simulation method was employed to discuss the influence of excavation methods and FFZ properties on rock mass deformation. Results show that as the width of the middle pilot tunnel increases, the top arch deformation initially rises and then falls. Excavating the sidewalls first will significantly aggravate the deformation. As the width or dip-angle of FFZ increases or its height from the top arch decreases, the top arch deformation becomes more significant. The first layer excavation of the plant significantly influences the rock mass deformation. The rock mass located more than twice the width of the tunnel is almost unaffected by FFZ. This study is significant for the stability analysis of deep-buried caverns across FFZ.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 11","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10064-024-03949-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the use of semi-georeferenced photogrammetric dense point clouds in the investigation of rock mass discontinuity properties 论半地理参考摄影测量密集点云在岩体不连续特性研究中的应用

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-19 DOI: 10.1007/s10064-024-03947-9

Mehmet Ali Temur, Sultan Kocaman, Hakan Ahmet Nefeslioglu

{"title":"On the use of semi-georeferenced photogrammetric dense point clouds in the investigation of rock mass discontinuity properties","authors":"Mehmet Ali Temur, Sultan Kocaman, Hakan Ahmet Nefeslioglu","doi":"10.1007/s10064-024-03947-9","DOIUrl":"10.1007/s10064-024-03947-9","url":null,"abstract":"<div><p>This study investigates the potential and limitations of using partial image orientation in Structure from Motion (SfM) photogrammetry to assess geometric properties of rock mass discontinuities investigated under various conditions. The photogrammetric point clouds were produced from images taken with a low-cost camera. An arbitrary (local) coordinate system was established by aligning a leveled 3D box with all axes oriented to the geographical North. Consequently, the need for terrestrial surveys to obtain ground control points was eliminated as the translation parameters required for photogrammetric image orientation could be disregarded in the proposed method. The investigations were conducted at various experimental sites to measure discontinuities in rock masses with diverse structural properties. The discontinuity properties such as orientation, persistence, weathering, aperture, filling, roughness, and waviness were measured by applying traditional scan-line surveys. Traditional orientation measurements and photogrammetric point cloud values were compared across different rock masses and discontinuity conditions. The results indicated that using a smartphone for image capture and a prismatic scale box for partial absolute orientation produced highly accurate point cloud data for characterizing rock mass discontinuities. Additionally, a new method, LCP + LSPF (Least Cost Path + Least Square Plane Fitting), was introduced for measuring partially closed-trace discontinuities. This method was found to be essential for sedimentary formations, primarily characterized by bedding planes. Moreover, it became evident that as the level of structural blocking increased and the interlocking of rock fragments decreased, the LCP + LSPF method was crucial for accurately representing rock masses, especially when considering Geological Strength Index (GSI) values.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 11","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142451058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of recycled polyester fiber reinforcement on the mechanical behavior and microstructure of red mud-improved volcanic ash 再生聚酯纤维加固对红泥改良火山灰力学行为和微观结构的影响

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-18 DOI: 10.1007/s10064-024-03962-w

Di Wu, Changming Wang, Hailiang Liu, Xiaoyang Liu, Hengli Wang, Qingyu Wang

{"title":"Effect of recycled polyester fiber reinforcement on the mechanical behavior and microstructure of red mud-improved volcanic ash","authors":"Di Wu, Changming Wang, Hailiang Liu, Xiaoyang Liu, Hengli Wang, Qingyu Wang","doi":"10.1007/s10064-024-03962-w","DOIUrl":"10.1007/s10064-024-03962-w","url":null,"abstract":"<div><p>Using recycled waste for soil improvement is a sustainable strategy that can reduce resource consumption. In this paper, recycled polyester fiber (RPF) is proposed to improve the engineering performance of red mud- improved volcanic ash (RV). A series of mechanical test were performed for RVs with five different content of RPF. And the microstructure was also investigated using scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) and mercury intrusion porosimetry (MIP) tests. Results show that RPF significantly reinforces the mechanical strength and toughness of RV and the optimum content of RPF is 0.9%. The Unconfined compressive strength (UCS), cohesion (<i>c</i>) and internal friction angle (<i>φ</i>) of reinforced soil enhanced by up to 122%, 40% and 8% compared to untreated soil at the optimum incorporation and optimum water content, respectively. The failure model of RPF-reinforced RV is converted from brittle to ductile, and the toughness parameters are significantly improved. Microscopic investigations reveal that RPF forms a complex three-dimensional structure within the reinforced soil. Adhesion and friction interactions at the fiber-matrix interface are the main reasons for the enhancement of strength and toughness. However, the performance of composites does not continue increasing with RPF content. Excessive fibers gather and twist to form weak zones, reducing the strength and stiffness of material. In practice, the optimal fiber content needs to be controlled to ensure the best mechanical properties. This eco-friendly soil improvement can promote the harmless utilization of red mud and waste polyester materials contributing to ground improvement techniques in volcanic areas.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 11","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142447356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pore-fluid salinity effect on desiccation cracking of fine-grained soils 孔隙流体盐度对细粒土干燥开裂的影响

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-18 DOI: 10.1007/s10064-024-03958-6

Zhonghao Sun, Shiyu Ren, Xin Wei, Ling Xu

{"title":"Pore-fluid salinity effect on desiccation cracking of fine-grained soils","authors":"Zhonghao Sun, Shiyu Ren, Xin Wei, Ling Xu","doi":"10.1007/s10064-024-03958-6","DOIUrl":"10.1007/s10064-024-03958-6","url":null,"abstract":"<div><p>Desiccation cracks in soil cause undesirable impacts on soil properties. Increasing extreme heat and drought events may lead to more severe soil salinization and desiccation cracking. However, the discrepancies and intrinsic mechanisms of the cracking behaviors of different fine-grained soils affected by pore-fluid salinity are unclear. This study investigates the pore-fluid salinity effect on cracking characteristics of different fine-grained soils. Desiccation crack tests with a wide range of salt concentrations are conducted for three fine-grained soils with different sensitivity to pore-fluid chemistry. Liquid limit tests and scanning electron microscopy analyses are carried out to investigate the effect of particle-fluid interactions and microstructure changes on cracking. The degree of cracking is the largest in bentonite and varies greatly with the change of pore-fluid salinity. Cracking in kaolin is less affected by pore fluids, showing a slight decrease at large NaCl concentrations. The degree of cracking is the lowest in silt and shows no clear trend with the change of pore-fluid salinity. Detailed quantitative characteristics of crack patterns are compared. Liquid limit tests and scanning electron microscopy analyses reveal different electrical sensitivity of the three soils to pore fluid influenced by particle-fluid interactions and changes in microstructure. Crack parameters exhibit a larger variation for bentonite with high electrical sensitivity and are relatively stable for soils with low electrical sensitivity. The correlation between the electrical sensitivity and the crack parameters is relevant to the evaluation and control of desiccation crack in fine-grained soils with various pore-fluid salinities.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 11","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142447386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-tide hysteresis effect of low-frequency debris flow after earthquake: a case study of Xifan Gully 地震后低频泥石流的高潮滞后效应：西番沟案例研究

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-18 DOI: 10.1007/s10064-024-03913-5

Zheng Zhong, Ningsheng Chen, Guisheng Hu, Zheng Han, Huayong Ni

{"title":"High-tide hysteresis effect of low-frequency debris flow after earthquake: a case study of Xifan Gully","authors":"Zheng Zhong, Ningsheng Chen, Guisheng Hu, Zheng Han, Huayong Ni","doi":"10.1007/s10064-024-03913-5","DOIUrl":"10.1007/s10064-024-03913-5","url":null,"abstract":"<div><p>To address the issue of debris flow high-tide often lagging behind earthquakes by 1–2 years in a region, this study uses the case of the Xifan Gully debris flow, which occurred on June 25, 2018, in the Jiuzhaigou area. The research was conducted as follows: First, the amount of new material sources in Xifan Gully was determined by comparing drone images taken before and after the earthquake. Second, regional daily rainfall data from meteorological stations were used to calculate the runoff and infiltration in the gully. Third, indoor shear tests were conducted on soil samples collected on-site to determine the relationship between cohesion (C) and internal friction angle (φ) with changes in moisture content. Finally, numerical simulations were used to calculate how the factor of safety (FS) of the soil in Xifan Gully changes with rainfall. Results show that the peak acceleration brought by the Jiuzhaigou County earthquake to Xifan gully was 164.3 Gal. The materials of Xifan gully and newly added landslide and channel materials occupied 78.81 × 10<sup>4</sup> and 16.07 × 10<sup>4</sup> m<sup>3</sup>, respectively. Although the rainfall in September 2017 was the highest in the last decade, the loose material did not reach saturation. The peak rainfall before debris flow eruption in the Xifan Gully (June 21, 2018) was 21.8 mm, and the effective rainfall reached 68.5 mm until the occurrence of debris flow (June 21–25). At this time, the loose source reached saturation and debris flow started. The results demonstrated that High-tide hysteresis of post-earthquake debris flows is due toe the earthquake not only amplifying the amount of loose material but also increasing the amount of rainfall required to saturate the soil, thereby extending the time needed for the soil to reach saturation. Overall, our results are beneficial for monitoring and early warning of debris flow disasters in mountainous areas.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 11","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142447387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the disintegration characteristics of expansive stiff clay: with consideration of expansion-disintegration interaction 膨胀性硬质粘土的崩解特性研究：考虑膨胀-崩解相互作用

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-17 DOI: 10.1007/s10064-024-03943-z

Qiong Wang, Yun Zhou, Wei Su, Jiang Xie, Yihe Xu, Yichun Liu, Weimin Ye

{"title":"Study on the disintegration characteristics of expansive stiff clay: with consideration of expansion-disintegration interaction","authors":"Qiong Wang, Yun Zhou, Wei Su, Jiang Xie, Yihe Xu, Yichun Liu, Weimin Ye","doi":"10.1007/s10064-024-03943-z","DOIUrl":"10.1007/s10064-024-03943-z","url":null,"abstract":"<div><p>The disintegration of expansive stiff clay will cause irreversible damage and deterioration of mechanical properties of the soil. The latest studies show that the disintegration is related to the swelling capacity of soil. In this study, a series of hydration disintegration tests and swelling pressure tests were performed on compacted Nanning expansive stiff clay samples with different initial water contents and dry densities. The observed disintegration process of all samples could be divided into initial, rapid and residual disintegration stages, among which the rapid stage dominated the whole process. By introducing relevant indicators to quantify the disintegration process, it was found that at a given dry density, the average disintegration rate of the sample decreased with increasing initial water content; while at a given water content, it decreased with increasing initial dry density. Such phenomena coincided well with the obtained evolution of swelling pressure at different initial water contents and dry densities. Based on these findings, the expansion-disintegration interaction mechanism of expansive stiff clay was finally analyzed from the perspectives of microstructure and hydration cracking. The initial conditions of the compacted samples determine the volume of inter-aggregates pores and thus the water transfer rate in soils, which affects the formation of hydration cracks. The cracking is induced by tension failure due to the expansion gradient formed during the hydration of sample, destructing the soil integrity to facilitate the disintegration. The disintegration, in turn provides preferential water infiltration channels to accelerate further soil expansion and hydration cracking. Such interactions proceeded until the completion of sample disintegration.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 11","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ground liquefaction caused by 6 February 2023 Kahramanmaraş earthquakes of Türkiye and some assessments on its extent and impacts on built environment 2023 年 2 月 6 日土耳其卡赫拉曼马拉什地震造成的地面液化及其范围和对建筑环境影响的一些评估

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-17 DOI: 10.1007/s10064-024-03946-w

R. Ulusay, Ö. Aydan, H. Kumsar

{"title":"Ground liquefaction caused by 6 February 2023 Kahramanmaraş earthquakes of Türkiye and some assessments on its extent and impacts on built environment","authors":"R. Ulusay, Ö. Aydan, H. Kumsar","doi":"10.1007/s10064-024-03946-w","DOIUrl":"10.1007/s10064-024-03946-w","url":null,"abstract":"<div><p>Two disastrous earthquakes, named Pazarcık (M<sub>w</sub>7.8) and Ekinözü (M<sub>w</sub>7.6), occurred on February 6, 2023 in the southeast part of Türkiye and were collectively named “Kahramanmaraş earthquakes”. These seismic events were caused by a left lateral strike-slip faults, and resulted in significant loss of life, severe damage to infrastructures and buildings, and geotechnical damages such as mainly large-scale slope failures, rockfalls, and ground liquefaction. The main goal of this study is to assess the extend and impact of widespread ground liquefaction, particularly on built environment. Additionally, the ranges of amount of settlement and tilting of buildings due to ground liquefaction were briefly discussed and liquefaction caused by Kahramanmaraş earthquakes were compared with those others occurred in Türkiye. The site observations indicated that except a village, a short section of a highway, a few bridges and two settlements, widespread liquefaction was mainly observed in agricultural non-urbanized fields. The maximum amount of settlement at some liquefaction locations reached up to 2 m and high-raise buildings tilted 7–8° from the vertical reaching up about 20°. Observations indicated that single-storey and two-storeys buildings with a basement to a certain depth, a lower center of gravity and raft foundation should be considered suitable on soils susceptible to liquefaction in earthquake-prone regions without taking any counter-measures against ground liquefaction. Mass movements along the shoreline of the Gölbaşı Lake were unlikely to be caused by lateral spreading resulting from ground liquefaction and they were rather due to planar sliding along a weak layer dipping towards the lake with progressive failure.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 11","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142447336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on dynamic shear characteristics of calcareous sand reinforced with rubber and geogrid 用橡胶和土工格栅加固的钙质砂的动态剪切特性研究

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-16 DOI: 10.1007/s10064-024-03951-z

Junli Gao, Lai Pan, Xiaolin Bian, Jiajun Wang, Yuqi Li

{"title":"Study on dynamic shear characteristics of calcareous sand reinforced with rubber and geogrid","authors":"Junli Gao, Lai Pan, Xiaolin Bian, Jiajun Wang, Yuqi Li","doi":"10.1007/s10064-024-03951-z","DOIUrl":"10.1007/s10064-024-03951-z","url":null,"abstract":"<div><p>To address the reduced bearing capacity of rubber-reinforced calcareous sand while also alleviating pollution from discarded tires, a combined reinforcement method using rubber and geogrid is studied. This approach utilizes the geogrid’s capability to enhance material bearing capacity through the netting effect, complementing the rubber’s reinforcement of calcareous sand. By cyclic direct shear tests, this study investigates the dynamic shear characteristics and particle fragmentation mechanism of calcareous sand reinforced with rubber and geogrid. The analysis focuses on the shear characteristics of reinforced calcareous sand and the corresponding patterns of particle crushing. The findings indicate that: (I) Geogrid reinforcement effectively restrains volume deformation in the soil induced by rubber particles. (II) Reinforcement with rubber and geogrid compensates to a certain extent for the reduction in shear stiffness attributed to the rubber mixture. (III) The relative crushing rate of unreinforced calcareous sand post-test is 25.9%, which increases to 29.8% with geogrid reinforcement, decreases to 19.1% with rubber reinforcement, and reaches 22.6% with combined rubber and geogrid reinforcement. The geogrid’s particle crushing rate disadvantage is offset by the advantage provided by rubber reinforcement. The collaboration of rubber and geogrid reinforcement effectively addresses the limitations of rubber sand as a foundation material, rendering it more suitable for practical applications.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 11","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrating analytical and machine learning approaches to simulate and predict dam foundation stress and river valley contraction in a large-scale reservoir 整合分析和机器学习方法，模拟和预测大型水库的坝基应力和河谷收缩

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-16 DOI: 10.1007/s10064-024-03941-1

Ziwen Zhou, Zhifang Zhou, Sai K. Vanapalli

{"title":"Integrating analytical and machine learning approaches to simulate and predict dam foundation stress and river valley contraction in a large-scale reservoir","authors":"Ziwen Zhou, Zhifang Zhou, Sai K. Vanapalli","doi":"10.1007/s10064-024-03941-1","DOIUrl":"10.1007/s10064-024-03941-1","url":null,"abstract":"<div><p>The safety of several large-scale reservoirs all over the world has been of concern due to dam foundation stress (DFS) that gradually changes following impoundment inducing the river valley contraction (RVC). Presently, there are limited approaches for the prediction of DFS and RVC based on complex hydro-geomechanics principles. However, these approaches require extensive information that is cumbersome and time-consuming to gather and hence expensive. In this paper, five machine learning models (MLMs) for DFS and RVC prediction were established by merging innovative analytical, BP neural networks and optimized algorithm approaches. Three key influencing factors; namely: seepage, temperature, and creep are used as input information in these models. The developed MLMs were validated using well-documented case study results over nine years for Xiluodu reservoir in China. The trend-fitting effect and statistical indicators of the proposed MLMs demonstrated strong predictive ability (R<sup>2</sup> > 0.9). Among the MLMs, Generic algorithm-BP and Sparrow search algorithm-BP methods were found to be comprehensive. The predicted RVC and DFS using MLMs are consistent with the coupled multi-field analytical method from the literature and provide reliable predictions using limited information. This study serves as a valuable reference for predicting DFS and RVC of large reservoirs for ensuring long-term safety.\u0000</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 11","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142438729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on water softening characteristics and multi-stage sliding zone reactivation mechanism of old clay landslides in the Three Gorges Reservoir area subjected to groundwater 三峡库区老黏土滑坡受地下水影响的水软化特征及多级滑动带再活化机理研究

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-16 DOI: 10.1007/s10064-024-03956-8

Lijuan Sun, Yihan Zhao, Chenjia Li, Yiping Sun, Shiwei Gao

{"title":"Study on water softening characteristics and multi-stage sliding zone reactivation mechanism of old clay landslides in the Three Gorges Reservoir area subjected to groundwater","authors":"Lijuan Sun, Yihan Zhao, Chenjia Li, Yiping Sun, Shiwei Gao","doi":"10.1007/s10064-024-03956-8","DOIUrl":"10.1007/s10064-024-03956-8","url":null,"abstract":"<div><p>The reactivation events of old landslides in the Three Gorges Reservoir area occur frequently, making it imperative to study the water softening characteristics and reactivation mechanism. An old clay landslide was selected as the focus of the research, and a segmented water injection permeable sliding surface was designed to simulate the formation and evolution of the old sliding zone during the process of groundwater rise. Volumetric water content sensors, pore water pressure gauges, high-speed camera devices, and Geopiv-RG digital image processing technology were used to obtain data on multiple physical fields. The analysis results indicated that the decrease in shear strength of the sliding zone soil and the sudden increase in pore water pressure on the sliding surface were important factors in the reactivation of old landslides. The surface deformation exhibited prominent zoning characteristics, primarily categorized into zones of strong deformation, weak deformation, and traction deformation. The failure mechanism involved shear sliding at the front edge, tensile cracking and failure at the trailing edge, and shear creep in the middle section. The development of multi-stage secondary sliding zones in old landslides can be categorized into three types: parallel to the original old sliding zone, partially overlapping with the original sliding zone to form a layered landslide, and completely overlapping with the original sliding zone, indicating overall reactivated deformation.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 11","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142438730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0