Study on formation and expansion condition of hidden soil cavity under condition of groundwater exploitation in karst areas

Wei, Yongyao; Sun, Sulin

doi:10.1007/s12665-017-6601-1

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…Establishing mechanical and mathematical models can reveal the evolution of soil caves' underwater level change. Wang et al improved the mechanical model of soil cave collapse based on the ultimate balance theory and accurately divided the evolution stages of soil caves [4][5][6]; Guo et al established a ground subsidence mechanical model of covered karst soil caves considering the cave's shape and size under the condition of groundwater slump to reveal the internal relationship between the initial groundwater level, the shape and size of the cave, and the negative pressure of the soil cave cavity and clarified the influence of the negative pressure change caused by the water level drop on the stability of the soil cave evolution stage [7,8]; Xue et al conducted acoustic emission tests to measure the effect of CO 2 adsorption force on the mechanical properties of deep coal seams and established an elastic damage constitutive model of nonlinear stress-strain relationship and proposed the deformation and failure mechanism of deep coal seam due to the strength of gas adsorption force [9]. To the greatest extent, the field test can reflect the collapse process of karst soil caves under hydrodynamic conditions [10].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Influence of Groundwater Level Fluctuation on Karst Soil Cave Collapse

2023

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Artificial water pumping and rainfall will induce groundwater level fluctuations, leading to large-scale karst collapse. Therefore, the combination of physical model test and FLAC3D numerical simulation is adopted to simulate the soil cave collapse caused by three different initial water level fluctuations in this paper. The influence of various initial water level heights on the variation of water-gas pressure, soil pressure of the overlying soil layer, and deformation in the existing soil cave during the fluctuation was analyzed. The relationship between initial water level height, deformation and collapse of the cave, and water-gas pressure was established, and the action law of water level fluctuations on the collapse of soil cave was introduced. The results show the following: (1) The change of water-gas pressure positively correlates with the initial water level height, directly affecting the overlying soil layer deformation. (2) The change of soil pressure of overlying soil positively correlates with the change of water-gas pressure under different initial water level fluctuations. (3) The deformation and collapse difficulty of the soil cave negatively correlates with the initial water level. The higher the initial water level, the stronger the negative pressure absorption and positive pressure gas explosion effect on the overburden on the soil cave and the collapse will occur with fewer water level fluctuations. (4) The numerical simulation results are consistent with the laboratory model test. These laws elucidate the change of water-gas pressure in different initial water level fluctuations and reveal the collapse mechanism of water level fluctuations. It will provide essential theoretical support for further research on the action law of hydrodynamic factors on karst collapse and a scientific and reasonable basis for urban groundwater pumping control, karst and roadbed collapse prevention and prediction.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Influence of Groundwater Level Fluctuation on Karst Soil Cave Collapse

2023

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Karst geology and mitigation measures for hazards during metro system construction in Wuhan, China

Wang

Lai

et al. 2020

Nat Hazards

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Study on field and numerical analysis of karst collapse as railway hazard

Islam,

Linrong,

Usman

et al. 2024

Proceedings of the Institution of Civil Engineers - Geotechnica

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The vulnerability of karst ecosystems and the weak mechanical performance of caves pose hidden risks in railways, leading to increased karst collapses. To analyze karst collapse as a railway hazard, we selected the Beijing-Guangzhou Railway, China line to identify karst features using the multi-source frequency domain method for its operational advantages. We also used ABAQUS to numerically analyze the factors (dynamic loading, groundwater fluctuations, over-burden thickness) affecting the collapse mechanism. The study reveals diverse stratigraphy, transitioning from a Quaternary layer to stable rock formations. A notable finding is that the presence of a karst cavity in the railway embankment significantly increases the vertical dynamic displacements, particularly within the soil layer, by 72%, highlighting the significant impact of karst sections on soil dynamics. The study also reveals that due to the groundwater table fluctuations from subsoil surface to subgrade surface, the maximum displacement increases by 73% in the subgrade section of the railway embankment. We consider soil overburden thickness to validate confirming reliability through field data and theoretical study. Findings offer crucial insights for managing karst hazards, enhancing railway safety, and ensuring durable infrastructure in challenging geological conditions.

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Study on formation and expansion condition of hidden soil cavity under condition of groundwater exploitation in karst areas

Cited by 3 publications

References 8 publications

Analysis of the Influence of Groundwater Level Fluctuation on Karst Soil Cave Collapse

Analysis of the Influence of Groundwater Level Fluctuation on Karst Soil Cave Collapse

Karst geology and mitigation measures for hazards during metro system construction in Wuhan, China

Study on field and numerical analysis of karst collapse as railway hazard

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