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对锚注前软岩巷道围岩应力状态进行弹塑性分析,计算出锚注前围岩残余强度区半径;在此残余强度区内进行注浆,并将注浆区再细化为弹性区和塑性区,引入岩石蠕变的鲍尔丁-汤姆逊模型,建立了软岩巷道锚注支护结构的蠕变分析模型,采用塑性区岩体体积不变的假设,对锚注支护结构进行了黏弹性分析和黏塑性分析,推导出软岩巷道锚注支护结构应力及位移的蠕变公式.理论分析与相似模拟结果表明:软岩巷道锚注支护结构弹性区应力与时间无关,塑性区应力随时间而变化;弹性区、塑性区位移随时间的推移而不断增大,最后趋于一定值,且塑性区位移与半径成反比关系.
The stress state of the surrounding rock of soft rock roadway before the bolting is analyzed elastically and the radius of the residual strength zone of the surrounding rock is calculated. The grouting zone is grouted in the residual strength zone, and the grouting zone is refined into the elastic zone and Plastic zone, the Bourdin-Thomson model of rock creep is introduced to establish the creep analysis model of the bolting and grouting support structure in soft rock roadway. Based on the assumption that the volume of rock mass in plastic zone remains constant, The viscoelasticity analysis and the viscoplasticity analysis are deduced to deduce the creep formulas of the stress and displacement of the bolting and grouting support structure in soft rock roadway.The theoretical analysis and simulation results show that the stress in the elastic zone of the bolting and grouting support structure in soft rock roadway has nothing to do with the time, Plastic zone stress changes with time; elastic zone, plastic zone displacement increases with time, and finally tends to a certain value, and plastic zone displacement is inversely proportional to the radius.