锚杆锚索支护巷道层状顶板变形特征及离层监测研究

Deformation characteristics and separation monitoring of layered roof roadway supported with bolts and cables

从分析层状顶板离层特征和顶板离层观测的原理入手,结合现场观测结果,认为两基点离层指示仪的深浅基点应分别设置在与巷道顶板锚索锚杆上端头同一水平位置;各类回采巷道在经受工作面采动影响时,安设深基点的顶板岩层都将产生位移,因此,对锚杆锚索支护巷道进行顶板离层观测的同时,还必须开展巷道顶板下沉量观测,只有把这2种观测结果结合起来,才能准确和客观地评价巷道锚杆锚索支护效果以及巷道的稳定性。在全面分析研究不同顶板岩层赋存条件下锚杆锚索支护巷道的变形与离层的基础上,得到了各类巷道顶板离层的临界值。

From the analysis of characteristics of roof separation and the principle of roof separation observation,deep and shallow basis points of indicator should be set on the same level respectively with anchor end of cables and bolts.The strata to install the deep basis points of indicator may take place displacement in all kinds of roadway affected by mining action.Except for roof separation observation,roof subsidence observation must be conducted. Only combined these two observations,the effect of bolt supporting and surrounding rock stability can be evaluated more objectively.Based upon the comprehensive analysis of different roof strata occurrence conditions,critical value of roof separation for all kinds of bolting support roadway was proposed.