Impacts of Aquitard Properties on an Overlying Unconsolidated Aquifer in a Mining Area of the Loess Plateau: Case Study of the Changcun Colliery, Shanxi

Xu, Shaofa; Zhang, Yongbo; Shi, Hong; Zhang, Zhixiang; Chen, Junfeng

doi:10.1007/s10230-019-00649-7

Cited by 11 publications

(1 citation statement)

References 31 publications

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“…Based on a numerical simulation of consolidation in the subsidence area and tensile failure in the fault area, Shu et al [14] reported that the tensile fracture strength in the fault area of a thick coal seam had a significant influence on the distribution of mining stress and the rock layer. In addition, Xu et al [15] studied the influence of the thick coal seam mining overburden on loose aquifers and showed that coal seam excavation reduced the impermeability of the aquifer and increased the hydraulic gradient between the porous aquifer and fractured bedrock aquifer. Ma et al [16] introduced fault fractal dimensions and fold fractal dimensions as indicators of aquifer permeability, and after a fuzzy comprehensive evaluation, permeability levels were delineated in the study area of thick coal seams.…”

Section: Introductionmentioning

confidence: 99%

Fracture Development and Multifield Coupling Evolution Law of Soft Overburden Rock in a Medium-Thick Coal Seam Mine

Cai

Guo³

et al. 2022

Geofluids

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To study the fracture development and multifield coupling evolution law of soft overburden rock for medium-thick coal seam mining, taking the first 50105 working face of the Faer coal mine as the research background, a numerical simulation, a fractal theoretical analysis, and network parallel electric method experiments were conducted; the fracture development and coupled stress field and energy field evolution law of soft overburden rock for medium-thick coal seam mining are analyzed. The results showed that the overburden collapse process could be divided into three stages: pseudo-top collapse to key layer breakage, key layer breakage to overburden bending, and overburden bending to collapse and compaction. The fractal dimensions of the overburden fracture before and after breakage of the key layer showed a rising-stable-declining trend, and the experimental analysis showed that fracture development began in the unmined area at the front end of the working face under the influence of overstress. In addition, the height of fracture development after stabilization was 53.7 m. A relationship was established between the height of the overburden fracture, peak stress, and dissipation of the energy density of the key layer, and their associated disaster mechanism induced by mining in a medium-thick coal seam progressed as follows: coal mining → stress redistribution → dissipation energy increase → fracture development → stress concentration → key stratum breaking → stress transfer → energy release → dynamic disaster. These results can be used as a reference for observing and mastering the development law of overburden fractures and preventing disasters under such conditions.

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Section: Introductionmentioning

confidence: 99%