Analysis of the Dynamic Pressure Characteristics for Rock Fracturation under High Intensity Mining

Abstract:

With the increase of mining intensity, mining causes significant dynamic disturbance and dynamic disasters, which have exerted a great influence on the safety and high-efficiency of production. This article based on the study of the displacement tendency of the rock masses on or under fractured face of the key layer, deduces the vertical stress calculation formula of the rock mass under the fractured face which indicates that the vertical stress is correlative with the length of fault block in key layer, the depth of key layer, the distance between key layer and mining coal seam, the equivalent elastic modulus of coal stratum underlying the key layer and so on; And then by numerical simulation, it studies the dynamic disturbance effect on front coal-rock masses as the key layer fractures which shows that dynamic disturbance effect caused by high intensity mining is relatively conspicuous on the fractured stratum (the key layer), the stratum under the fractured one and the stratum in the advancing direction of working face; As for the stratum on the fractured one (the key layer),the dynamic disturbance effect becomes less conspicuous as they grow farther away from the fractured one.

• Periodical: Advanced Materials Research (Volumes 734-737)
• Pages: 714-721
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.734-737.714
• Online since: August 2013
• Authors: Qing Feng Li*, Chuan Qu Zhu
• Keywords: Dynamic Disturbance, High Intensity Mining, Numerical Simulation, Stratum Fracturation

References

[1] Dou Lin-ming, HE Xue-qiu, Theory and technique of rock-burst prevention, China University of Mining and Technology Press, Xuzhou, 2001.

[2] Dou Lin-ming, ZHAO Cong-guo, YANG Si-guang, et al, Prevention and control of rock burst in coal mine, China University of Mining and Technology Press, Xuzhou, 2006.

[3] Mu Zong- long, DOU Lin-ming, LI Hui-min, et al, Numerical simulation of roof stratum effect on coal mass burst. Journal of Mining & Safety Engineering, 2009, 26(1): 26- 30.

[4] Goszcz, Antoni, Rock bursts and ways to combat them, Archiwum Gornictwa, 1991, 36( 3) :239- 261.

[5] Wang Hui- ming, The characteristics and prevention of rock burst in Sanhejian coal mine, Ground Pressure and St rata Control, 2004, 21(3): 115- 117.

[6] Wu Zhi-gang, ZHAI Ming-hua, ZHOU Ting-zhen, Prediction to roof pressure of the west mine in Xuzhou, Chinese Journal of Rock Mechanics and Engineering, 1996, 15( 2) : 163- 170.

[7] Qi Qing-Xin, WANG Yong-xiu, MAO De-bing, etc, Study on mechanism of rock-burst induced by high strength mining with condition of non-hard roof, Chinese Journal of Rock Mechanics and Engineering, 2005, 24(Supp.1): 5002- 5006.

[8] Qian Minggao, Shi Pingwu, Xu Jialin, Mine pressure and its control, China University of Mining and Technology Press, Xuzhou, 2010, p.84~90

[9] Qian Minggao, Liao Xiexing, Xu Jialin, et al, Theoretical study of key stratum in ground control, China University of Mining and Technology Press, Xuzhou: 2003, p.12~13