Dynamic triggering mechanism of the Pusa mining-induced landslide in Nayong County, Guizhou Province, China

Cui, Fangpeng; Xiong, Chen; Yang, Zhongping; Peng, Jianquan; Li, Jiangshan; Li, Haowen

doi:10.1080/19475705.2021.2017020

Cited by 28 publications

(12 citation statements)

References 26 publications

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“…Rock avalanches are slope process detachments that refer to sliding, toppling, or falling [25]. It is commonly believed that underground mining has a cantilever effect on the layered rock, which leads to the destruction of overburdened rock and ground cracks [26][27][28]. Rock avalanches associated with underground mining have been reported throughout mining history.…”

Section: Introductionmentioning

confidence: 99%

Deformation and Failure Process of Slope Caused by Underground Mining: A Case Study of Pusa Collapse in Nayong County, Guizhou Province, China

et al. 2022

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Pusa village is located in the karst mountain area of Nayong County, Guizhou Province, China. Laoyingyan mountain rock is gently dipping, the upper part consists of hard rock formations, and the lower part is made up of soft rock composed of 3 coal seams. On August 28, 2017, a massive landslide occurred in this area, resulting in 82,3000 m3 of debris, which resulted in significant casualties and brought up the malaise in society. In this paper, the geological conditions and long-term mining activities in the study area are analyzed by field investigation. The base friction tests and numerical models are used to simulate and analyze the failure and deformation process of Pusa collapse to accommodate the research on the deformation and failure mechanism of the slope and provide better prevention and treatment suggestions. The results show that the Pusa collapse can mainly be attributed to unique geological conditions, underground mining activities, and the topography of the slope. The intensified mining activities promoted the development of fractures and cracks in the slope, resulting in unstable upper slopes. The failure process of the Pusa collapse can be summarized into four-stage: the development of goaves roof deformation, the crest of the slope cracks, intensification of deformation, and occurrence of collapse. The upper slope with high strength rock developed crack-toppling failure. Meanwhile, the upper slope with low strength rock developed subside-crack-sliding failure, and those two failures together contributed to the mechanism of Pusa collapse. Slope deformation and failure mechanism can be summarized as subside-crack-toppling-shear sliding type.

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Section: Introductionmentioning

confidence: 99%

Deformation and Failure Process of Slope Caused by Underground Mining: A Case Study of Pusa Collapse in Nayong County, Guizhou Province, China

et al. 2022

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“…According to the study by Cui et al [40], the parameters of rock masses with the Voronoi grid are listed in Table 1.…”

Section: Numerical Modelmentioning

confidence: 99%

Failure Mechanism of Anti-Inclined Karst Slope Induced by Underground Multiseam Mining

et al. 2022

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There occurred a lot of catastrophic landslides in Southwest China karst areas in recent years. This study numerically simulated the failure process of Pusa landslide by distinct element method (UDEC). The Voronoi diagram algorithm was used to discretize the rock blocks in the upper part of the mining area, and the erosion in sliding source area caused by heavy rainfall was simulated by increasing the block density and reducing the joint strength. Results obtained using UDEC matched the failure process recorded by UAV, and the subsidence of monitoring points on the slope surface was well coincident with the InSAR results. The DEM results are as follows: firstly, under the action of underground coal mining, the overlying strata of the mountain deform toward the goaf and the deformation of the stratum increase significantly with the caving of the roof stratum; and the deep karst fissures in the overlying stratum have an important influence on the deformation of the mountain; the upper strata form a subsidence zone along the fissures, expanding the range of tensile fissures. Secondly, due to the excavation and unloading of the rock masses at the leading edge of the sliding area, the extrusion deformation occurs to the outside of the slope, resulting in the critical instability of sliding area. Finally, with the strength decreasing of rock masses and structural planes by heavy rainfall, the stability of the mountain continues to decrease until the sliding area collapses.

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“…The theoretical analysis of karst caves, on the other hand, is generally made on the basis of consideration of the overall stability with a discounted safety factor based on engineering experience, and does not analyze the influence of factors such as the position and shape of the karst cave on the final fracture surface of the pit slope. For caves in special positions, the positional relationship to the structural plane may change the original failure path along the structural plane 21 . Therefore, uniform discounting of rock lateral pressure or increasing the stability safety factor for design is not compatible with reality.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of rock slope and calculation of rock lateral pressure in foundation pit with structural plane and cave development

Wang

2022

Sci Rep

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In this study, numerical simulations were carried out to analyze the influence of caves in different positions and shapes, in combination with structural planes, on the stability of the slope and the failure characteristics of a rock slope in a deep foundation pit with high inclination structural planes and cave development. The schemes for substituting a single karst cave for karst caves were constructed. Based on the penetration failure characteristics of karst caves between parallel structural planes, calculation methods for the safety factor of the rock foundation pits and the upper bound of the lateral pressure of supporting structures under the combined influence of the caves and structural planes have been developed, which can be used to assess the safety factor of a rock mass and to calculate the lateral pressure under complex geological conditions. The example of Xuzhou Metro Line 3 Sanhuan South Road Station is taken as an example to verify. The displacement calculation results show that the proposed rock and soil pressure calculation method is close to the actual measured value.

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Dynamic triggering mechanism of the Pusa mining-induced landslide in Nayong County, Guizhou Province, China

Cited by 28 publications

References 26 publications

Deformation and Failure Process of Slope Caused by Underground Mining: A Case Study of Pusa Collapse in Nayong County, Guizhou Province, China

Deformation and Failure Process of Slope Caused by Underground Mining: A Case Study of Pusa Collapse in Nayong County, Guizhou Province, China

Failure Mechanism of Anti-Inclined Karst Slope Induced by Underground Multiseam Mining

Stability analysis of rock slope and calculation of rock lateral pressure in foundation pit with structural plane and cave development

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