Application technologies of grouting effect test for large-area suspended roof instability disasters in room-pillar goafs

Wen Li; Donghao Wang; Qinghua Liu; Jianghua Li; Jian Li; Wenwu Dou; Qingtong Chen; Liqin Zhao; Haozhe Zhang

doi:10.1117/12.2620465

22 December 2021 Application technologies of grouting effect test for large-area suspended roof instability disasters in room-pillar goafs

Wen Li, Donghao Wang, Qinghua Liu, Jianghua Li, Jian Li, Wenwu Dou, Qingtong Chen, Liqin Zhao, Haozhe Zhang

Author Affiliations +

Proceedings Volume 12058, Fifth International Conference on Traffic Engineering and Transportation System (ICTETS 2021); 120583I (2021) https://doi.org/10.1117/12.2620465
Event: 5th International Conference on Traffic Engineering and Transportation System (ICTETS 2021), 2021, Chongqing, China

Abstract

The large-area suspended roof instability disaster in the room-pillar goafs is the main hazard faced in the comprehensive control of the coal mining subsidence area in the Yushenfu mining area in China. The collapse and induced by the sudden instability of the suspended roof in the continuous room and pillar goaf mine earthquakes have become a key issue that the local governments and energy companies urgently need to solve. Based on a case of suspended roof grouting control in a section of the room-pillar goaf from Baofu Highway, the paper examines the effect of grouting control based on numerical simulation and field measurement technology. Research shows that surface surveys, undermine surveys and drilling surveys are important means and methods for judging the degree of large-area suspended roof instability in room-pillar goafs; the grouting control method is an effective method to prevent large-area suspended roof instability in room -pillar goafs disasters, and the grout stone body test technology is a necessary technique for grouting effect test. The strength of the test block in the 28-day compressive strength test of the grout test block is greater than 0.5 Mpa can satisfy the supporting effect on the roof of the room-pillar goaf area; the numerical simulation test can simulate the comparison of displacement and stress changes before and after grouting, and then provide a supporting method for the test of the grouting control effect. Comprehensive grout stone test technology and numerical simulation test technology can provide a criterion for the test of the grouting control effect of large-area suspended roof instability disasters in the room and pillar goaf, which has a certain degree of applicability and feasibility.

Citation Download Citation

Wen Li, Donghao Wang, Qinghua Liu, Jianghua Li, Jian Li, Wenwu Dou, Qingtong Chen, Liqin Zhao, and Haozhe Zhang "Application technologies of grouting effect test for large-area suspended roof instability disasters in room-pillar goafs", Proc. SPIE 12058, Fifth International Conference on Traffic Engineering and Transportation System (ICTETS 2021), 120583I (22 December 2021); https://doi.org/10.1117/12.2620465

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