深部半煤岩回采巷道围岩破坏特征及支护技术

Failure Characteristics and Support Technology for Deep Half Coal- rock Mining Roadway

为研究深部半煤岩回采巷道围岩破坏特征,以某矿半煤岩回采巷道的具体工程地质为背景,利用弹塑性力学知识求解并绘制了该半煤岩体巷道围岩破坏状况,并运用FLAC3D建立了深部半煤岩巷道的三维数值计算模型,分析了不同支护方案作用下巷道围岩的变形破坏规律,优化了巷道支护方案与参数,提出深部半煤岩巷道围岩控制的"高强度预应力锚网索+横纵梯子梁"的联合支护方案,并在现场进行了施工与监测。结果表明:采用优化后的支护方案有效的控制了深部半煤岩巷道围岩的变形破坏,确保了深部半煤岩巷道围岩的稳定。

In order to research the failure characteristics of half coal- rock roadway,taking the work face of a mine as background,on the basis of previous studies by using elastic- plastic mechanics solution to draw the half coal- rock roadway surrounding rock failure status,and the three dimensional numerical calculation model of half coal- rock roadway in deep coal mine was established by using FLAC3 Dsoftware. Moreover,in- depth research was carried on deformation damage law of surrounding rock,the supporting scheme and parameters of roadway were also obtained optimization. At last,the joint supporting scheme of ＂ high strength prestressed bolt-mesh- cable plus longitudinal and cross ladder beam＂ was proposed for surrounding rock control of half coal- rock roadway,field construction and monitoring was also carried out. Results suggests that the optimal supporting scheme effectively controlled the deformation damage of surrounding rock of the half coal- rock roadway in deep coal mine,thus the stability of rock surrounding half coal- rock roadway located in deep coal mine was guaranteed.