击振条件下围岩松动圈试验研究

Experimental study on loose circles of surrounding rock under shock vibration condition

为精确掌握巷道围岩松动圈的范围,合理优化巷道锚杆支护参数,通过自研测力锚杆对巷道围岩松动圈进行测试,得到巷道围岩各部位松动圈变化范围为:顶部、紧邻顶部、起拱部位及直墙部位巷道松动圈厚度均值分别为1070 mm、985 mm、997 mm及970 mm;巷道平均围岩松动圈为1016 mm,属于中等围岩松动圈。基于数值模拟软件Flac 3D对试验所得松动圈值进行验证,二者所得结果接近,验证了试验结果的准确性。

In order to accurately grasp the range of loose circles of roadway surrounding rock and reasonably optimize the parameters of roadway bolt support,the loose circle of roadway surrounding rock was tested by self-developed force-measuring bolt,and the change range of loose circle of roadway surrounding rock was obtained as follows:the average thickness of loose circles of roadways at the top,adjacent to the top,at the bulging and straight wall was 1070 mm,985 mm,997 mm and 970 mm respectively;the average loose circle of roadway surrounding rock is 1016 mm,which belongs to a medium loose circle of the surrounding rock.Based on the numerical simulation software Flac 3D,the values of the loose circle obtained from the test are verified,and the results are close to each other,which verifies the accuracy of the test results.