2020
DOI: 10.1155/2020/7356740
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Study on the Strata Movement Rule of the Ultrathick and Weak Cementation Overburden in Deep Mining by Similar Material Simulation: A Case Study in China

Abstract: In the deep mining areas of western China, there exist ultrathick and weak cementation strata in the overburdens above the Jurassic coal seams, and the overburden lithology is generally moderately a little weaker than the medium-hard strata. Yet, the practical measurement indicates that the surface movement rule in this area displays the specialty that is apparently inconsistent with its lithology, which increases the uncertainty of safe production in coal mines. In this study, the similar material and numeric… Show more

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Cited by 19 publications
(18 citation statements)
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“…e tensile fracture line expands obliquely along the tensile-compressive transition line. e above fracture characteristics have also been confirmed in two-dimensional numerical simulation and similar simulation or field measurement [27,[34][35][36][37][38]. e fracture characteristics in section II-II are the same as those in the KS first fracture.…”
Section: Ks Fracture Characteristicssupporting
confidence: 65%
“…e tensile fracture line expands obliquely along the tensile-compressive transition line. e above fracture characteristics have also been confirmed in two-dimensional numerical simulation and similar simulation or field measurement [27,[34][35][36][37][38]. e fracture characteristics in section II-II are the same as those in the KS first fracture.…”
Section: Ks Fracture Characteristicssupporting
confidence: 65%
“…It can be seen from Table 1 that the four working faces were all super-large mining height working faces, but there were great differences in the intensity degree of M GPA. In general, the M GPA of the deep-buried working face was more obvious than that of shallow buried working face [8,12,19]. After entering PW, the working faces were greatly different fro m each other.…”
Section: Comparative Analysis Of Mgpamentioning
confidence: 99%
“…According to formula (31), it can be seen that when the groundwater seepage velocity at the crack opening is greater than v cr , water and sand inrush will occur, and with the increase of internal friction angle, cohesive force, and aquifer buried depth, the higher the critical water flow velocity is required for off-stability of arch. It can also be explained that the stability of the transition arch formed by the sand with a certain cohesion is affected by the characteristics of the sand and the external mechanical environment.…”
Section: Floating Weight Of Sandy Unit In Watermentioning
confidence: 99%
“…Some scholars have also conducted in-depth research on similar simulated materials. Through different ratios of similar materials, simulated materials with similar physical properties of rock formations are obtained, and the internal mechanism of thick loose seams in the process of coal mining is analyzed through internal physical experiments, the law of sinking [29][30][31][32].…”
Section: Introductionmentioning
confidence: 99%