隧道围岩挤入型流变大变形预测及其工程应用研究

Study on the Prediction of Large Squeezing Creep-Deformation of Tunnel Surrounding Rocks & Its Applications

将高地应力条件下隧道软弱围岩发生挤入型大变形的复杂力学行为归属为变形速率快而收敛慢、量值大、达到稳定的时间长的一种非线性蠕变范畴,着重研究了对围岩挤入型大变形的预测方法及其可靠性评价.对乌鞘岭铁路隧道断层带施工开挖大变形问题进行了变形预测的工程应用,并对一种可用以解决上述围岩大变形问题的新型自进式压力分散型让压锚杆提出了应用建议.

A complex mechanical behavior of large squeezing deformation of tunnel weak rocks is discussed under high ground stress condition. From the point of view of rock rheology, the definition of such squeezing deformationis interpreted comprehensively that it can be belonged to the scope of a kind of rock nonlinear creep with fast deformation rate but slow and large convergence. An emphasized research is focused on squeezing prediction method and its probability evaluation which are applied to analyze and assess the large squeezing deformation of a rock fault zone of the Wushaoling railway tunnel under excavation. A study with suggestions on a new typed yield-pressure rock anchor bolts/cabies for solving the above-mentioned squeezing problem is presented.