Characteristics Analysis of Roof Overburden Fracture in Thick Coal Seam in Deep Mining and Engineering Application of Super High Water Material in Backfill Mining

Liu, Weitao; Pang, Lifu; Liu, Yuben; Du, Yanhui

doi:10.1007/s10706-018-00770-4

Cited by 13 publications

(6 citation statements)

References 6 publications

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“…Each filling stops 30–60 m, and the roof condition and fracture development are observed. 29 , 30 In order to further analyze the condition of the immediate roof, four monitoring points were set at 0, 6, 12, and 18 m of the overlying strata to monitor the stress change of the overlying strata.…”

Section: Evolution Law Of Surrounding Rock Stress and Fracture In Min...mentioning

confidence: 99%

Study on overlying strata migration law of strip interval filling mining

et al. 2023

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Aiming at the problem that it is difficult to popularize in Guizhou mining area due to high filling cost, taking 11071 working face of Panzhihua Coal Mine in Liupanshui as the research background, the idea and technology of strip interval filling mining are put forward. Through theoretical analysis and mechanical tests, the reasonable range of strip spacing distance and mechanical parameters of filling body were obtained. The FLAC3D simulation software is used to analyze the stress field, displacement field, and plastic zone of five kinds of design schemes, and the UDEC simulation software is used to carry out the filling mining of No.7 coal seam. The results show that the strip interval filling mining technology regards the empty roof area as a controllable underground spatial structure, and the single spatial stress field changes little. The load on the immediate roof is gradually transferred from the top of the empty roof area to the top of the filling body. The “filling body-direct roof” structure improves the self-bearing capacity of the immediate roof, and the overlying surrounding rock migration is controlled. With the increase of mining depth, it gradually tends to the original rock stress, and the control effect on surface subsidence is more significant. Finally, “filling 3 m interval 3 m” is determined as the optimal filling scheme. In the process of simulated filling mining, the peak stress in the stress concentration area of the front coal wall shows a trend of “increase-decrease-increase,” and the peak stress curve of the immediate roof in the middle of the stope changes from “increase-decrease ‘trend to’ increase-decrease-increase-decrease” trend. The rock layer near the immediate roof is in a stress concentration state in the coal wall area on both sides, and the middle part is not obvious.

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Section: Evolution Law Of Surrounding Rock Stress and Fracture In Min...mentioning

confidence: 99%

Study on overlying strata migration law of strip interval filling mining

et al. 2023

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“…Sixty percent of the annual precipitation is mainly concentrated in July-September. This study area is located in a temperate semiarid desert plateau continental monsoon climate [36]. In the study area, there is a TAS layer covering the ground.…”

Section: Engineering Backgroundmentioning

confidence: 99%

Characteristics of Overburden and Ground Failure in Mining of Shallow Buried Thick Coal Seams under Thick Aeolian Sand

et al. 2022

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Mining can lead to overburden failure and ground damage, which are more severe in mining shallow buried thick coal seams (SBTCS) under thick aeolian sand (TAS). We attempted to discover characteristics of mining in this particular geological condition through theoretical derivation and numerical simulation, and field monitoring. Theoretical methods, combined with numerical simulation and field monitoring methods, reveal the essence of the development and distribution of surface cracks caused by mining SBTCS and depth to thickness ratio (DTR) to be 13.43, less than 15. The findings show that, when mining SBTCS, the overburden breaks down periodically, the initial collapse distance is greater than the collapse step, approximately 55 m on average, and the collapse step is approximately 45 m, on average, in the Daliuta Coal Mine. The collapsed blocks are stacked into goaf and form “masonry beams”, and many cracks and pores are generated between the blocks. The weak stress of the aeolian sand layer causes the movement angle in the aeolian sand layer to be smaller than that in the bedrock, and leads to much sheer, tension and compression failure on the ground, and the main forms of cracks are compression uplift, tensile cracking, shear step.

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“…On the other hand, some coal mining processes affect the extraction rate of coal resources, resulting in a waste of coal resources [ [4] , [5] , [6] , [7] ]. The process of coal mining also produces a large amount of coal gangue waste, which accumulates on the surface, occupies good land and pollutes surface water and groundwater [ [8] , [9] , [10] , [11] , [12] ].…”

Section: Introductionmentioning

confidence: 99%