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The Influence of Parameters on the Stability of a Coal Roadway in Weakly Cemented Soft Rock and Stability Failure Features
(1 State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590; 2 College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590; 3 College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590)
Abstract For a coal roadway in weakly cemented soft rock, it was critical to maintain stability of the mining zone, and in this case the failure features were closely related to the mechanical behaviors of the composite structure composed of rock, coal, and rock. A calculation model for a coal roadway featuring soft rock at both thetop and bottom was established. Orthogonal numerical tests were conducted with mixed levels, in which the strength, stiffness, thickness, and overburden of various rock and coal layers were selected as influential factors and displacements at the top, bottom, and two sides were used as an evaluation index. Five quantified influential levels of various factors were classified by defining the quantified index k and creating an evaluation standard by classifying the statistic F using different inspection levels, namely highly significant, significant, relatively significant, non-significant, and non-influential. The results show that: the stiffness of the coal seam has a significant impact on roadway deformation at a certain depth of overburden; various failures occur with the combination of different factors, such as tensile shear at the roof, floor, and coal seam, which can be used as a reference for analyzing the failure mechanism and potential roadway maintenance.
Abstract��
For a coal roadway in weakly cemented soft rock, it was critical to maintain stability of the mining zone, and in this case the failure features were closely related to the mechanical behaviors of the composite structure composed of rock, coal, and rock. A calculation model for a coal roadway featuring soft rock at both thetop and bottom was established. Orthogonal numerical tests were conducted with mixed levels, in which the strength, stiffness, thickness, and overburden of various rock and coal layers were selected as influential factors and displacements at the top, bottom, and two sides were used as an evaluation index. Five quantified influential levels of various factors were classified by defining the quantified index k and creating an evaluation standard by classifying the statistic F using different inspection levels, namely highly significant, significant, relatively significant, non-significant, and non-influential. The results show that: the stiffness of the coal seam has a significant impact on roadway deformation at a certain depth of overburden; various failures occur with the combination of different factors, such as tensile shear at the roof, floor, and coal seam, which can be used as a reference for analyzing the failure mechanism and potential roadway maintenance.
ZHAO Zeng-Hui-1,
2 ,
WANG Wei-Ming-3 etc
.The Influence of Parameters on the Stability of a Coal Roadway in Weakly Cemented Soft Rock and Stability Failure Features[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(3): 143-151
2014, Vol. 51 