复采巷道过破碎顶板区钢梁支护研究  

Research on steel beam support in fractured roof area of re-mining roadway

作　　者：何峰[1,2] 王振伟[3] 于洋[1] 张胜云[2] 周玉龙 张小康[2] HE Feng;WANG Zhenwei;YU Yang;ZHANG Shengyun;ZHOU Yulong;ZHANG Xiaokang(Department of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China;Huozhou Coal Electricity Group Co.,Ltd.,Huozhou 031400,China;North China University of Technology,Beijing 100144,China)

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]霍州煤电集团有限责任公司,山西霍州031400 [3]北方工业大学,北京100144

出　　处：《煤炭科学技术》2019年第7期115-120,共6页Coal Science and Technology

基　　金：国家自然科学基金资助项目(11202091,51774184,51774167)

摘　　要：为了解决复采巷道掘进时频繁过空巷和破碎顶板区巷道支护的难题,采用理论分析、数值计算和现场实测相结合的方法,通过分析"破碎顶板-工字钢梁"相互作用机理,建立2种梯形棚梁力学计算模型,研究了复采残采松软破碎围岩梯形棚被动支护强度确定问题;并根据梯形巷道几何参数及覆岩力学参数,计算不同棚梁跨长不同棚距下顶板压力值并与工字钢梁最大支护载荷进行比较;对复采巷道过实体煤和破碎顶板区围岩控制平面应变力学模型进行数值计算。结果表明:将梯形棚立柱和顶梁简化成简支压弯构件模型,更符合实际;当棚梁跨长为3.2m,单梁最大允许棚距为0.7m;巷道顶板压力小于梯形棚梁抗拉强度和屈服强度,可满足复采掘进巷道支护要求。研究为复采矿井破碎顶板工字钢梯形棚支护方案确定提供理论依据。In order to solve the problem of development roadway supporting on frequent abandoned workings and broken roof area,the theoretical analysis,numerical calculation and field measurement are combined to analyze the interaction mechanism of"fractured roof-I-beam",two kinds of trapezoid shed beam mechanical calculation models are built,and the problem of determining the passive support strength of the trapezoidal shed of the soft-breaking surrounding rock during re-mining and residual mining is studied;and according to the geometric parameters of trapezoidal roadway and mechanics parameters of the overlying strata,the different span lengths of different sill beams are calculated.The pressure value of the lower roof is compared with the maximum supporting load of the I-beam.The numerical calculation of the plane strain mechanics model of the surrounding rock of the solid mining road and the fractured roof area is carried out.The study results showed that the trapezoidal shed column and the top beam are simplified as a compression bending composite model,which is more in line with the reality;when shed beam span is 3.2 m,the maximum allowable shed distance of the single beam is 0.7 m.The roof pressure of the roadway is less than the tensile strength and yield strength of the trapezoidal sill beam,which can meet the support requirements of the roadway for re-mining roadway.The study provides a theoretical basis for the determination of trapezoidal shed support schemes in similar complex mining.

关 键 词：复采巷道 破碎顶板 工字钢棚梁 围岩控制 围岩变形 

分 类 号：TD353[矿业工程—矿井建设]