超千米深井巷道围岩变形特征与支护技术

为解决超千米深井巷道支护难题,以新汶矿区深井巷道为工程背景,分析深部矿井地应力、围岩强度与结构等地质力学参数分布特征,超千米深井巷道围岩、支护体变形及破坏状况。采用UDEC数值模拟软件,研究不同支护方式与参数下超千米深井岩巷围岩变形、破坏特征与支护作用。基于实测与数值模拟研究结果,确定新汶华丰矿-1180回风大巷采用全断面高预应力、高强度锚杆与锚索及注浆联合支护加固方式。详细介绍-1180回风大巷支护井下试验,包括支护参数设计、支护材料、底板注浆锚索施工工艺及矿压监测结果。通过分析围岩位移、顶板离层及锚杆、锚索受力监测数据,评价回风大巷支护效果。井下试验表明:高预应力、高强度锚杆与锚索及注浆联合加固技术,能够有效控制超千米深井岩巷大变形,保持围岩长期稳定。最后,针对井下试验中存在的问题,提出改进意见。

DEFORMATION AND SUPPORT OF ROCK ROADWAY AT DEPTH MORE THAN 1 000 METERS

To solve the supporting issues related to the roadways at depths more than 1 000 m in Xinwen coal mining area，the mechanical parameters，such as the in-situ stresses，the strengths and the structures of surrounding rocks，the deformation and damage states of surrounding rocks of deep roadway and the supports in coal mines， were analyzed. The deformation and damage characteristics of rocks surrounding a rock roadway with depth more than 1 000 m under various supporting types and parameters were simulated with UDEC. Based on the in-situ test data and numerical simulation results，the full section reinforcement with the high strength and pretension rock bolts and cables combined with grouting was put forward for the support of No.1180 main return roadway in Huafeng coal mine，Xinwen coal mining area. The underground test was described in detail，including the support parameters，materials，underground construction technologies for cables and grouting in roadway floor，and monitoring results. The supporting effects were evaluated through the analyses on the data of surrounding rock displacements，roof separations and the loads along bolts and cables. The underground test results confirmed that the large deformation of surrounding rock in the main return roadway with depth more than 1 000 m was effectively controlled，and the long term stability was kept by means of the combined support system of high pretension and strength bolts and cables with grouting.