大采高小煤柱沿空掘巷围岩变形规律研究

A Study on the Surrounding Rock Deformation of the Gob-Side Driving Entry with Small Pillars and Large Mining Height Face

为解决大采高小煤柱沿空掘巷支护的技术难题,针对谢桥矿1161（3）轨道顺槽的工程技术条件,对其变形特征和破坏特点进行了分析,并运用FLAC3d软件模拟了轨道顺槽在回采期间的受力情况,最终确立了以高强度预应力锚杆、锚索为核心的围岩强化控制技术,优化了支护形式与参数,加强了肩角的支护强度,并进行了井下矿压监测。研究结果表明：在巷道掘进初期,围岩变形速度快,锚杆索支护体系载荷增长迅速;由于厚底煤释放了部分的能量,巷道顶底板整体变形不大;在高支护强度（0.3-0.5MPa）下,回采期间顶板离层最大值为86mm,得到了很好的控制,达到了预期的支护效果。

To solve the technical problems concerning the gob-side entry driving support with large mining heights and small pillars,this study,taking Xieqiao Mine as the case,first observed the engineering and technical conditions of Rail Crossheading 1161（ 3） and analyzed its deformation and damage characteristics. Then it simulated the force condition of tail entry during mining with FLAC3 d,established surrounding rock strengthen control technology based on the high strength pre-stressed anchors and anchor cables,optimized the support forms and parameters,strengthened support intensity in the shoulder angle,and conducted underground mine pressure monitoring. The results show that in the early stage of roadway excavation,the surrounding rock deforms fast and the load of anchor cable support system increases rapidly.However both the roadway roof and floor have little deformation due to the thick bottom coal releasing a part of the energy. With the high supporting strength（ 0. 3- 0. 5MPa）,the maximum roof separation reaches only 86 mm when mining and the surrounding rock deformation is well controlled,which achieves the desired supporting effect.