Experimental Study on the Movement and Failure Characteristics of Karst Mountain with Deep and Large Fissures Induced by Coal Seam Mining

Zhong, Yang; Zhao, Qian; Liu, Xinrong; Yin, Zhiming; Zhao, Yuan; Li, Xuyong

doi:10.1007/s00603-022-02910-y

Cited by 24 publications

(11 citation statements)

References 61 publications

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“…The change and transfer of stress and strain in the mountain will also cause fracture initiation, propagation and coalescence, as well as the breaking of the intact rock bridge [45]. Some studies have shown that in the karst mountainous area in Southwest China, the existence of deep and large karst fissures at the top of the slope largely determines the extension direction of the tension cracks and the location of the slope body cracking [22,46]. Actually, the propagation mode of the mining-induced fractures in the overlying strata also has certain rules, that is, they propagate asymmetrically in the two sides of the goaf (in the free face of the goaf first).…”

Section: Evolution Processmentioning

confidence: 99%

Failure Mechanism Analysis of Mining-Induced Landslide Based on Geophysical Investigation and Numerical Modelling Using Distinct Element Method

et al. 2022

Remote Sensing

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Underground mining activity in the karst mountain in southwestern China has induced several large-scale rocky landslides and has caused serious casualties. At present, there is a lack of systematic research on the formation mechanism of landslides in this area using multi-method fusion technology. First, the orthophoto images of the landslide area obtained by UAV photography were used to analyze the deformation characteristics of the landslide. Second, the failure characteristics of the strata overlying the goaf were analyzed by geophysical detection. Finally, the deformation response characteristics of the mountain under underground mining were analyzed by UDEC numerical simulation. The results revealed that during the underground mining, the failure process of the mountain occurred in four stages: fracture expansion, subsidence and collapse, shear sliding, and multi-level sliding. Gently dipping soft–hard alternant strata and a blocky rock mass structure formed the geological foundation of the landslides. Underground mining accelerated the fracturing of the overlying strata and the formation of a stepped penetrating sliding surface. Tensile movement of the structural planes of hard sandstone in the free face, and shear sliding of the weak mudstone layer, were the main causes of the landslides. The slope instability mode was tension-shear fracturing, shear sliding, back toppling, and compressive shear failure. In addition, the fracture propagation in the overlying strata and damaged geological structure revealed by the geophysical detection were consistent with the simulation results. This study provides ideas for the precise countermeasures of disaster prevention and mitigation for similar landslides in this area.

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Section: Evolution Processmentioning

confidence: 99%

Failure Mechanism Analysis of Mining-Induced Landslide Based on Geophysical Investigation and Numerical Modelling Using Distinct Element Method

et al. 2022

Remote Sensing

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“…Especially, the eastward displacement induced by mining activities in Figure 10f is opposite to the sliding direction of the slope. This uneven surface displacement is highly susceptible to forming tensile cracks at the crown of the slope [27,51]. Furthermore, intense rainfall also plays a crucial role in slope deformation, as it can infiltrate the rock mass through ground fissures and rock fractures, softening the rock layer and increasing the load on the slope.…”

Section: The Spatial Separation Of Mining and Landslide Deformation F...mentioning

confidence: 99%

“…On the other hand, some studies have been carried out to explore the failure mechanism of landslides caused by underground mining extraction, such as the influence function methods [26], physical tests [27,28], and numerical simulations [29,30]. However, due to the kinematic process of mining-related landslides encompassing both mining-induced subsidence and slope instability, limited research has been conducted to separate the spatiotemporal interaction between landslides and subsurface excavation.…”

Section: Introductionmentioning

confidence: 99%

Retrieving the Kinematic Process of Repeated-Mining-Induced Landslides by Fusing SAR/InSAR Displacement, Logistic Model, and Probability Integral Method

et al. 2023

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The extraction of underground minerals in hilly regions is highly susceptible to landslides, which requires the application of InSAR techniques to monitor the surface displacement. However, repeated mining for multiple coal seams can cause a large displacement beyond the detectable gradient of the traditional InSAR technique, making it difficult to explore the relationship between landslides and subsurface excavations in both temporal and spatial domains. In this study, the Tengqing landslide in Shuicheng, Guizhou, China, was chosen as the study area. Firstly, the large-gradient surface displacement in the line of sight was obtained by the fusion of SAR offset tracking and interferometric phase. Subsequently, a multi-segment logistic model was proposed to simulate the temporal effect induced by repeated mining activities. Next, a simplified probability integral method (SPIM) was utilized to invert the geometry of the mining tunnel and separate the displacement of the mining subsidence and landslide. Finally, the subsurface mining parameters and in situ investigation were carried out to assess the impact of mining and precipitation on the kinematic process of Tengqing landslides. Results showed that the repeated mining activities in Tengqing can not only cause land subsidence and rock avalanches at the top of the mountain, but also accelerate the landslide displacement. The technical approach presented in this study can provide new insights for monitoring and modeling the effects of repeated mining-induced landslides in mountainous areas.

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“…Although there were several methods for predicting rock movement induced by coal mining, such as influence function methods [14,15] and physical test [16,17], there is no doubt that numerical method can reveal the failure process more comprehensively [4,18]. Finite element method (FEM) has been widely utilized in engineering, but it is more suitable for analyzing small deformation problems rather than large deformation problems like landslides [19].…”

Section: Introductionmentioning

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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Experimental Study on the Movement and Failure Characteristics of Karst Mountain with Deep and Large Fissures Induced by Coal Seam Mining

Cited by 24 publications

References 61 publications

Failure Mechanism Analysis of Mining-Induced Landslide Based on Geophysical Investigation and Numerical Modelling Using Distinct Element Method

Failure Mechanism Analysis of Mining-Induced Landslide Based on Geophysical Investigation and Numerical Modelling Using Distinct Element Method

Retrieving the Kinematic Process of Repeated-Mining-Induced Landslides by Fusing SAR/InSAR Displacement, Logistic Model, and Probability Integral Method

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

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