Similar Simulation Test of Overlying Rock Failure and Crack Evolution in Fully Mechanized Caving Face with Compound Roof

Backfill mining has become an important part of coal mine green mining technology. In this paper, the spatiotemporal characteristics of coupling effect between the roof and dense backfill body were analyzed by theoretical analysis and similar simulation test, and Xingtai Mine in China was taken as an engineering case for verification. The results show that the larger subsidence of the roof is, the stronger the supporting capacity of the backfill body is, and the interaction between the two is more obvious, thus showing a coupling effect. This coupling effect presents a regular variation with the increase of backfill distance and time, that is, the coupling degree of roof and backfill body is high in the middle of goaf and low in the vicinity of the coal pillar in spatial distribution, and the coupling behavior of roof and backfill body continues to occur slowly with time. Through the monitoring of stress and displacement in the engineering site and the analysis of borehole observation results, the spatiotemporal coupling effect between roof subsidence and backfill support is fully verified. The research results are of great significance to the control of surrounding rock in backfill mining, the study of the mechanical aging characteristics of backfilling materials, and the optimization of backfill body support performance.

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Similar Simulation Test for Breakage Law of Working Face Floor in Coal Mining Above Aquifer

Journal of Computational and Theoretical Nanoscience ◽

10.1166/jctn.2016.5273 ◽

2016 ◽

Vol 13 (7) ◽

pp. 4230-4235

Author(s):

Zhenhua Li ◽

Zhai Changzhi ◽

Hui Xie ◽

Faguang Yang

Keyword(s):

Coal Mining ◽

Simulation Test ◽

Working Face ◽

Similar Simulation Test ◽

Similar Simulation

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Strata Behaviors of Fully-Mechanized Sublevel Caving Face Based on Similar Simulation Test

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.734-737.638 ◽

2013 ◽

Vol 734-737 ◽

pp. 638-643

Author(s):

Hua Wen Lv

Keyword(s):

Abutment Pressure ◽

Main Roof ◽

Test Model ◽

Simulation Test ◽

Slow Increase ◽

Working Face ◽

Sublevel Caving ◽

Pressure Peak ◽

Similar Simulation Test ◽

Similar Simulation

in view of research situations of the fully mechanized sublevel caving, the similar simulation test model for fully mechanized sublevel caving was presented. During the top-coal caving process, variation of top-coal subsidence and abutment pressure were measured. Consequently, the ground pressure behavior of fully mechanized sublevel caving was analyzed. The following conclusions can be reached: (1) top coal subsidence experiences the process of slow increase, trend to aggressive and sharp increase; (2) undulate change as well as decay after reaching the peak of abutment pressure is appeared with the advance of working face, strata behaviors of main roof displays smoothly; (3) on account of cushion above hydraulic support, influence of dynamic load during periodic weighting such as rock burst can be eased and abutment pressure peak moves forward, consequently, strata behaviors in the working face presents smoothly.

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Mechanism of Surrounding Rock Failure and Crack Evolution Rules in Branched Pillar Recovery

Minerals ◽

10.3390/min7060096 ◽

2017 ◽

Vol 7 (6) ◽

pp. 96 ◽

Cited By ~ 3

Author(s):

Gaojian Hu ◽

Tianhong Yang ◽

Jingren Zhou ◽

Qinglei Yu ◽

Lianku Xie ◽

...

Keyword(s):

Rock Failure ◽

Surrounding Rock ◽

Crack Evolution

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Experimental Platform Development of Similar Simulation and Mechanical Test for Undersea Metal Mining

E3S Web of Conferences ◽

10.1051/e3sconf/202020603032 ◽

2020 ◽

Vol 206 ◽

pp. 03032

Author(s):

Zhixiang Liu ◽

Xiaoqing Dai ◽

Shan Yang ◽

Yuxi Liu

Keyword(s):

Mechanical Test ◽

Mineral Resources ◽

Test System ◽

Metal Mining ◽

Model Sample ◽

Similar Simulation Test ◽

Seabed Mining ◽

Safe Thickness ◽

Mental Resources ◽

Similar Simulation

With the depletion of shallow metal resources in the land, the development of seabed resources has become a new direction. In order to achieve safe and efficient exploitation of seabed metal mineral resources, a similar simulation test platform was established for seabed mining of metal minerals in this paper. Similar simulation materials and the best material ratios were selected to make simulated specimens. A series of mechanical pressurization devices and model sample were prototyped and submarine simulation mining test was conducted. During the simulation mining test, stress and strain changes and microscopic observations of crack evolution were monitored by the static strain test system. These indicators revealed the characteristics of ore-rock mechanical change in the development of submarine mental resources. By exploring the best safe thickness of seabed resource mining, it provides effective data reference for subsequent seabed resource development, so as to realize safe and efficient mining.

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Analysis on Subsidence Law of Bedrock and Ultrathick Loose Layer Caused by Coal Mining

Geofluids ◽

10.1155/2021/8849955 ◽

2021 ◽

Vol 2021 ◽

pp. 1-12

Author(s):

Weiping Shi ◽

Kaixin Li ◽

Shengwen Yu ◽

Cunzhi Zhang ◽

Jingkai Li

Keyword(s):

Coal Mining ◽

Ground Subsidence ◽

Simulation Test ◽

Working Face ◽

Similar Materials ◽

Bedrock Surface ◽

The Law ◽

Similar Simulation Test ◽

Theory Calculation ◽

Loose Layer

In the process of coal mining, when the buried depth is large and the loose layer is thick, the ground subsidence tends to be abnormal, thus causing great damage to the surface ecological environment. In order to reveal the mechanism of mining ground subsidence under ultrathick loose layer, taking 1305 working face of a mine as the background, the law of mining ground subsidence under ultrathick loose layer was analyzed through field measurement. The law of bedrock subsidence is analyzed by similar simulation test, and the role of ultrathick loose layer in bedrock subsidence is quantitatively analyzed. The hydrophobic settlement model of ultrathick loose layer is established by settlement theory calculation, and the law of ground subsidence caused by hydrophobic of ultrathick loose layer is analyzed. The results show that the ground subsidence is mainly composed of bedrock subsidence and hydrophobic settlement of ultrathick loose layer. The maximum ground subsidence measured in the field is 4.201 m, the bedrock surface subsidence obtained by the simulation test of similar materials is 3.552 m, and the subsidence of ultrathick loose layer obtained by hydrophobic settlement analysis is 0.58 m. Adding the subsidence of bedrock surface and the subsidence of ultrathick loose layer, the ground subsidence is 4.132 m. It is in good agreement with the total ground subsidence measured in the field, which verifies the rationality that the ground subsidence mainly includes bedrock subsidence and hydrophobic settlement of ultrathick loose layer.

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