强风化带回采巷道临界宽度研究

处于强风化带的回采巷道具有围岩风化裂隙增多、强度减弱、矿压显现强烈等特征,如果仍采用普通围岩的巷道设计宽度进行掘进,容易形成巷道局部冒顶、围岩变形大、支护困难等工程问题.为了有效控制和维护巷道围岩,对影响巷道临界宽度的主要因素进行详细分析,认为自然地质因素、掘进与回采技术、支护因素是影响巷道临界宽度的主要因素;应用极限平衡理论、弹塑性理论,结合目前煤矿锚杆支护技术确定强风化带回采巷道的临界宽度;并以东庞矿为工程实例来合理确定强风化带回采巷道的临界宽度.图1,表2,参9.

Research on Roadway Critical Width of Strongly Weathering Zone

In strongly weathering zone, the surrounding rock of roadway has some special engineering problems that are the weathered fissure increasing, the rock mass strength weakening, the ground behaviour intensifying and so on. If the roadway was digged still according to the design width of the ordinary surrounding rock, the roadway easily occur roof partly falling, surrounding distortion enlarging and maintenance hardening. In order to effectively control and maintain the surrounding rock of roadway, the main factors affecting the roadway critical width was analyzed. The nature geological factor, digging, mining and support factor were the main factors. And the roadway critical width of the strongly weathering zone was determined rationally through applying the limit-equilibrium theory and elastic-plastic theory, combining with the present colliery bolt supporting technology. The Dongpang coal mine was taken as an engineering example to determine rationally the roadway critical width of the strongly weathering zone. 1fig., 2tabs., 9refs.