深部岩巷锚喷支护技术参数确定与试验研究
Determination and experimental study on technical parameters of bolt-shotcrete support for deep rock roadway
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摘要: 为解决深部岩巷稳定控制难题，采用数值模拟和现场工业性试验的方法，建立了大尺寸“锚杆支护+混凝土喷层”三维数值计算模型，系统研究了深部岩巷锚喷支护参数对巷道变形的控制作用。研究表明：随锚杆预紧力、间距、锚固长度的增加，巷道围岩变形量得到有效控制，且受预紧力和锚固长度的控制更为显著，而适宜的锚杆长度可以有效控制巷道变形；喷层强度和厚度较小时，喷层结构会导致巷道顶底板变形向两帮转移，当喷层强度和厚度达到一定时，喷层结构可改善巷道整体围岩的控制效果。基于研究结果，设计了锚网喷支护技术和参数，现场工业性试验验证了其合理性。Abstract: In order to solve the problem of deep rock roadway stability control, a large-size three-dimensional numerical calculation model of “bolt support and concrete shotcrete layer” was established by means of numerical simulation and field industrial test. The control effect of bolt and shotcrete support parameters on roadway deformation was systematically studied. The research showed that: with bolt pre-tightening force, spacing, the increase of the anchorage length, to effectively control the deformation of surrounding rock of roadway, and is subject to the control of pre-tightening force and the anchoring length is more significant, and the appropriate anchor length can effectively control the deformation of roadway, the strength of spraying layer and the thickness is small, the structure of spray layer will cause the deformation of roof and floor of roadway to shift to two sides, when the spray layer reaches a certain strength and thickness, spray layer structure can improve the overall control effect of surrounding rock of roadway. Based on research results, we design the spray anchor net supporting technology and parameters, and the industrial test its rationality was verified.
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