Deformation patterns and failure mechanism of high and steep stratified rock slopes with upper steep and lower gentle style induced by step-by-step excavations

Yang, Zhiquan; Fan, Xianglong; Yang, Yi; Kepeng, Hou; Du, Jun; Chen, Xinggui; Mi, Yapeng; Jiang, Chunping; Zhang, Jie; Guo, Yongfa

doi:10.1007/s12665-022-10327-7

Cited by 10 publications

(3 citation statements)

References 24 publications

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“…The ongoing construction of major projects, such as the Sichuan-Tibet Railway, Yunnan-Tibet Railway, Central Yunnan Water Diversion Project, and the Western Development Strategy, only exacerbates potential stability issues of these excavated slopes. The region where the rock mass is damaged by excavation is a common phenomenon in engineering geology [7][8][9]. Excavation, accompanied by the deformation of the rock mass during the unloading process, leads to a decline in rock mass quality, significantly impacting the safety and stability of slope geotechnical engineering [10].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Excavation Disturbance on the Stability of Bedding Cataclastic Rock Mass High Slope Containing Multimuddy Interlayers

Liu,

Zhang,

Guo

et al. 2024

Advances in Civil Engineering

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In China, slope engineering occasionally faces landslides in rocky slopes containing muddy interlayers, primarily triggered by excavation activities. These incidents lead to considerable human casualties and substantial economic losses. However, existing studies predominantly concentrate on the excavation-induced impacts on the stability of rocky slopes characterized by single-layered soft and weak interlayers. Conversely, reports on how excavation influences the stability of bedding cataclastic rock mass high slope containing multimuddy interlayers remain notably absent in the literature. Moreover, unloading due to excavation can swiftly compromise the mechanical integrity and overall quality of the rock mass, consequently impacting the stability of slopes postexcavation. Therefore, this paper modeled the unstable slope excavated at a waste incineration power plant in Yuxi, Yunnan, using the finite element strength reduction method. This approach was employed to comprehensively simulate the entire process of artificial multilevel excavation in a bedding cataclastic rock mass high slope containing multimuddy interlayers. This study investigated the impact of multilevel artificial excavation on slope stability by thoroughly considering factors including alterations in slope morphology, unloading effects, and the degradation of geotechnical parameters. The research yielded the subsequent conclusions. Multimuddy interlayers were the key to the slope’s instability. For slopes subjected to such multilevel excavation, efforts were made to minimize the exposure of muddy interlayers. Slopes above exposed muddy interlayers did not require additional support, while those below needed prioritized reinforcement. The likely instability mode of the actual slope was local destabilization leading to landslides. Furthermore, when using numerical simulation methods to study the impact of excavation disturbances on the stability of such slopes, it was necessary to consider the deterioration of geotechnical parameters to obtain results more reflective of actual conditions. These research findings provided valuable theoretical and empirical support for studies on similar excavated slopes.

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Section: Introductionmentioning

confidence: 99%

The Effect of Excavation Disturbance on the Stability of Bedding Cataclastic Rock Mass High Slope Containing Multimuddy Interlayers

Liu,

Zhang,

Guo

et al. 2024

Advances in Civil Engineering

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“…In addition, the numerical simulation technique is widely used in the analysis of slope stability, compared with physical model tests. This is because this technique not only reproduces the soil-structure interaction but also simulates the slope failure under various conditions, such as rainfall [18][19][20], earthquakes [21][22][23][24][25], human activity [26][27][28], etc. For example, Yin et al [29] simulated the Wangjiayan landslide during the 2008 Wenchuan earthquake using the Fast Lagrangian Analysis of Continua in Three Dimensions (FLAC3D) program.…”

Section: Introductionmentioning

confidence: 99%

Slope Stability and Effectiveness of Treatment Measures during Earthquake

Zhou

Wang

et al. 2023

Sustainability

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Slopes are prone to instability during earthquakes, which will cause geological disasters such as landslides and pose a great threat to people’s lives and property. Therefore, it is necessary to analyze the stability of slopes and the effectiveness of treatment measures during earthquakes. In this study, an actual slope in the creeping slide stage was selected and located in an area where earthquakes occur frequently. Once the slope experiences instability, it will produce great damage. Therefore, a finite difference program, Fast Lagrangian Analysis of Continua in Two Dimensions (FLAC2D), was employed in the numerical simulation to explore the stability of the slope before and after treatment under earthquake action. Different from previous studies, this study explores the effectiveness of various treatment measures on slope stability during earthquake. The computed results show that the stability of the slope is greatly influenced by earthquakes, and the slope displacement under seismic conditions is far larger than that under natural conditions. Three treatment measures, including excavation, anti-slide piles, and anchor cables, can significantly reduce slope displacement and the internal force on anti-slide piles, and improve the stability of a slope during an earthquake. This will provide a valuable reference for the strengthening strategies of unstable slopes. The analysis technique as well as the derived insights are of significance for slope stability and the effectiveness of treatment measures.

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“…At the same time, FLAC 3D has been used to establish a numerical model of a slope in the open-pit mine in Bingham Valley and analyze the conditions and trigger factors of slope movement. Yang et al [12] explored the deformation mode of a high and steep layered rock slope and its failure mechanism caused by gradual excavation; FLAC 3D was used to simulate the excavation process according to the actual situation. Srikrishnan et al [13] simulated an open-pit slope composed of different rock types using FLAC 3D .…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of a Steep Rock Slope in a Large Open-Pit Mine in a High-Intensity Area: A Case Study of the Yejiagou Boron Iron Mine

Zhang

2022

Geofluids

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The slope stability of open-pit mines has always been a major problem affecting the safe production of resources from open-pit step mines. At present, slope excavation in open-pit mines is difficult and slope instability problems are becoming increasingly prominent. In this study, an open-pit bench rock slope in Liaoning Province was taken as the research object. The physical parameters of the rock mass in the area were obtained through engineering drilling and large-scale direct shear tests. Based on the determination of the dominant group of the slope’s structural plane, the seepage deformation failure and maximum stress deformation of the slope were analyzed to explore the stability of high and steep rocky slopes in large open-pit mines. The results show that there is a group of dominant structural planes at the no. 1~3 observation points whose dip angle is steep and consistent with the slope inclination. The dip angle is slightly lesser at the slope toe, and the slope is basically a stable structure. The Janbu method was used to calculate the seepage stability of the slope and it is found that section 4-4 is in a dangerous area. In the stress nephogram, the maximum principal stress is located inside the slope, and the minimum principal stress is located at the surface of the free surface.

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Deformation patterns and failure mechanism of high and steep stratified rock slopes with upper steep and lower gentle style induced by step-by-step excavations

Cited by 10 publications

References 24 publications

The Effect of Excavation Disturbance on the Stability of Bedding Cataclastic Rock Mass High Slope Containing Multimuddy Interlayers

The Effect of Excavation Disturbance on the Stability of Bedding Cataclastic Rock Mass High Slope Containing Multimuddy Interlayers

Slope Stability and Effectiveness of Treatment Measures during Earthquake

Stability Analysis of a Steep Rock Slope in a Large Open-Pit Mine in a High-Intensity Area: A Case Study of the Yejiagou Boron Iron Mine

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