Soft rock wall of tunnels in deep mining will have large creep deformation when the stress in rock is near its ultimate strength.
在深井软岩条件下，巷道围岩应力状态处于岩石强度极限邻域内，围岩会产生较大的蠕变变形。
After several years to jumbolter research, the hard rocks always present in the soft ones in the wall rock procedure using jumbolter, which results in changing the boring tool during the procedure.
经过几年对锚杆钻机的跟踪研究，发现锚杆钻机在围岩作业中常遇到软岩中有硬岩夹层的现象，造成施工过程经常更换钻具的问题。
The rheologic model has been used to analyze the interaction between shaft wall and viscoelasticviscoplastic surrounding rock in soft rock stratum.
利用流变介质模型，分析软岩立并并壁与粘弹塑性围岩的相互作用。
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