Analysis on mechanism and key factors of surrounding rock instability in deeply inclined roadway affected by argillation and water seepage

• Published in: International journal of mining science and technology Vol. 25; no. 3; pp. 465 - 471
• Main Authors: Ma, Rui, Li, Guichen, Zhang, Nong, Liu, Cong, Wei, Yinghao, Zhang, Ming
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2015; School of Mines, China University of Mining&Technology, Xuzhou 221116, China%School of Mines, Kunming Metal urgy Col ege, Kunming 650033, China%JCHX Mining Management Co., Ltd, Beijing 101500, China
• Subjects: Anchoring defect; Argillation and water seepage; Deeply inclined; Shear sliding instability; 不稳定; 倾斜巷道; 围岩; 地下水渗流; 机制; 泥化; 渗水; 锚固螺栓; Argillation and water seepage; Shear sliding instability; Anchoring defect; Deeply inclined; Argil ation and water seepage
• ISSN: 2095-2686
• DOI: 10.1016/j.ijmst.2015.03.022

Based on the characteristics of surrounding rocks for deeply inclined roadway affected by argillation and water seepage, a structure model of layer crack plate was established to analyze the shear sliding insta-bility mechanism. Through solid mechanics analysis of anchored surrounding rock with defect from water seepage, combined with numerical analysis for instability mechanism under water seepage in deeply inclined roadway, key factors were proposed. Results show that with increasing height of layer crack plate, lateral buckling critical load value for high wall of the roadway decreases;there is a multi-stage distribution for tensile stress along the anchor bolt with defect under pulling state condition;groundwater seepage seriously affects the strength of surrounding rock of the roadway, to some extent the plastic zone of the high side rises up to 8 m. Finally some support strategies were proposed for the inclined roadway and successfully applied to Haoyuan coal mine in Tiela mining area, western China.