Engineering and Applied Sciences
Volume 4, Issue 6, December 2019, Pages: 149-153
Received: Nov. 14, 2019;
Accepted: Dec. 2, 2019;
Published: Dec. 7, 2019
Views 135 Downloads 53
Ma Shuyin, China Coal Technology and Engineering Group Chongqing Research Institute, Chongqing, China; State Key Laboratory of the Gas Disaster Detecting Preventing and Emergency Controlling, Chongqing, China
In order to obtain Stress distribution and damage law of Steeply inclined working face floor，this paper combined elastic-plastic mechanics theory to improve model of the half-infinite body model，and the three-dimensional half-infinite body model was established which comprehensively considered the stress characteristics in the strike and inclined directions of the working face，and the iterative formula of vertical stress in floors was calculated. Meanwhile，the three-dimensional stress distributions in floors with different depths were calculated by Software-MATHCAD and SUFER. The numerical simulation was applied to simulate no supporting condition and temporary supporting with Cement Based Grouting Material condition in fully-mechanized coal caving face of steeply inclined coal seam and obtained the corresponding plastic damage zone. According to the empirical formula calculated formula floor damage depth of 10.4m, and the application of cement grouting material was carried out on the floor, temporary support, in the working face, the lower floor heave amount reduced 28.7%, in the working face, the upper floor heave amount reduced 22.4%, and the supporting method can effectively control the floor damage. The results show that provided a theoretical basis for the floor management of steep coal seam working face.
Steeply Inclined Working Face Floor Stress Distribution and Supporting Research, Engineering and Applied Sciences.
Vol. 4, No. 6,
2019, pp. 149-153.
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/
) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
MENG Xiang-rui, XU Cheng-hui, GAO Zhao-ning, et al. Stress distribution and damage mechanism of mining floor [J]. Journal of China Coal Society, 2010, 35 (11): 1832-1836.
LIU De-jun. The stress distribution of the goaf and its relationship of water inrush [J]. Safety in Coal Mines, 1988, 7: 35-39.
LINFeng. Equivalent-material simulation and analysis of stress distribution over seam floors [J]. Journal of Anhui University of Science and Technology, 1990, 10 (3): 19-28.
CAO Shu-gang, XU Guang-ming, CHEN Lin-dun. Panel roadway floor stress distribution [J]. Ground Pressure and Strata Control, 1993, 10 (Supp): 177-180.
ZHU Shu-yun, JIANG Zhen-quan, YAO Pu, et al. Application of analytic method in calculating floor stress of a working face [J]. Journal of Mining and Safety Engineering, 2007, 24 (2): 191-195.
ZHANG Hua-lei, WANG Lian-guo. Computation of mining induced floor additional stress and its application [J]. Journal of Mining and Safety Engineering, 2011, 28 (2): 288-293.
WANG Lian-guo, HAN Meng, WANG Zhan-sheng et al. Stress distribution and damage law of mining floor [J]. Journal of Mining and Safety Engineering, 2013, 30 (3): 317-322.
LI Xiang-yang, LI Jun-ping, ZHOU Chuang-bing, Xiang wen-fei et al. Comparative study on numerical simulation and similarity simulation of overburden deformation in abandoned stope [J]. Rock and Soil Mechanics, 2005, 26 (12): 1907-1912.
GAO Zhao-ning, MENG Xiang-rui. Study on Deformation and Fracturing Characteristics of Seam Floor under Mining Influence [J]. mining safety & environmental protection. 2010, 37 (3): 17-20.
ZHANG Yong etc. Damage and Slip Mechanism of Floor in Longwall Mining on the Strike of Steep and Thick Coal Seam [J]. Coal Science and Technology, 2013, 41 (10): 9-12.
XUN Yan-chun, YANG Yang etc. Applicability Analysis on Statistical Formula for FailureDepth of Coal Seam Floor in Deep Mine [J]. Coal Sci-ence and Technology, 2013, 41 (9): 129-132.
YANG Sheng-li, ZHAO Bin, LI Liang-hui. Coal wall failure mechanism of longwall working face with false dip in steep coal seam [J]. Journal of China Coal Socity. 2019, 44 (2): 367-376.
WANG Nan, ZHENG Shangshang, LI Shanshan, KONG Dezhong. Stability Analysis of End Face Roof of Steep Inclined Coal Seam [J]. Safety in Coal Mines, 2019, 50 (6): 235-239.
CHENG Wei-min，SUN Lu-lu, WANG Gang et c. Similar material simulation test of steep-inclined extra-thick coal seam [J]. Journal of Mining & Safety Engineering. 2016, 33 (3): 387-392.
ZHANG Pingsong，WU Jiwen, LIU Shengdong. Study on dynamic observation of coal seam floor’s failure law [J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25 (Sup 1): 3009-3013.