山西常村煤矿S5轨道下山支护方案优化  

Optimization of the Supporting Scheme of S5 Track Dip Roadway in Changcun Coal Mine in Shanxi Province

作　　者：郜富平 李政岱 Gao Fuping;Li Zhengdai(Changcun Coal Mine, Shanxi Lu~n Environmental Energy Development Co. , Ltd.;School of Mechanics and Civil Engineering, China University of Mining and Technology （Beijing)

机构地区：[1]山西潞安环保能源开发股份有限公司常村煤矿 [2]中国矿业大学(北京)力学与建筑工程学院

出　　处：《现代矿业》2018年第3期7-11,共5页Modern Mining

摘　　要：巷道的有效支护对于确保巷道快速安全掘进意义重大。常村煤矿S5轨道下山原设计采用锚杆、锚索联合支护方案,巷道支护后矿压监测表明:(1)巷道顶板最大下沉量为77 mm,右巷帮最大收敛量为83 mm,左巷帮最大收敛量为55 mm,巷帮收敛呈现不对称发展,巷道变形量超过50 mm的控制要求;(2)巷道顶板锚杆、左帮锚杆、右帮锚杆和锚索的轴力分别为77,95,71,177 k N,锚杆、锚索的支护作用并未得到充分发挥。在充分分析该矿已建巷道成功支护案例的基础上,对S5轨道下山的支护方案进行了优化,即:(1)保持锚杆长度、间排距不变,锚杆均垂直于巷道顶板打设;(2)锚索采用"大五花"布置形式,采用3根锚索支护时,在巷道正中位置布置1根,其余2根锚索分别布置于巷道最外侧锚杆轴线位置处,并倾斜25°打设;(3)采用2根锚索支护时,锚索布置方式与原支护方案一致;(4)将所有锚索的初张拉力提高至350 k N。FLAC3D数值模拟分析表明:支护方案优化后巷道顶板最大下沉量降低至49.2 mm,巷道两帮最大收敛量降低至41.67 mm。现场试验表明:采用支护优化方案后,巷道顶板最大下沉量为42 mm,巷道两帮最大收敛量约为48 mm,可见对该矿S5轨道下山支护方案的优化对于控制该段巷道围岩变形具有显著成效。Roadway supporting with high efficient is of great significance to roadway safety excavation with high speed. The original supporting method of S5 track dip roadway of Changcun coal mine is the integrated supporting scheme based on anchor rob and anchor rope. The actual mine pressure of the roadway supported by the original scheme is monitored,the result show that：（1）the maximum subsidence value of roadway roof is 77 mm,the maximum convergence value of the right side of roadway is 83 mm,the maximum convergence value of the left side of roadway is 55 mm,the convergence values of the both sides of roadway is characterized by asymmetrical development features,the overall deformation values of the roadway is larger than allowed value（50 mm）;（2）axial force of the anchor robs in the roof,left side,right side of the roadway and anchor rope are 77,95,71,177 k N,the supporting function of anchor rob and anchor rope can not be fully displayed. The supporting cases of the roadways constructed already of the mine is discussed in detail,the original supporting scheme is optimized. The optimization supporting scheme can be described as：（1）the length and density of anchor rob are consistent to the ones of the original support ing scheme,the anchor robs are set perpendicular to the roadway roof;（2） the anchor ropes are set with ＂ big pentagon＂ form,when the roadway is supported by adopting three anchor ropes,the one of them are set in the middle of roadway,the others are set in the axis areas of the anchor robs located at the outermost of roadway,and the anchor ropes are installed with the tile angle of 25°;（3）when the roadway is supported by adopting two anchor ropes,the anchor rope install method is consistent to the one of original supporting scheme;（4）initial tension force of anchor ropes is increased to 350 k N. The numerical simulation analysis results of FLAC3 Dsoftware show that under the application of the optimization supporting scheme,the maximum subsidence value of roadway roof is

关 键 词：井巷支护 轨道下山 矿压监测 支护方案优化 

分 类 号：TD353[矿业工程—矿井建设]