软岩隧道围岩加固方法优化对比试验研究与分析

为解决软岩隧道工程的支护优化设计问题,研制出力学曲线与原岩相似的模型材料,形成软岩工程常用的支护设计方法对应的物理模型,即锚杆支护、锚喷支护、锚杆加长的锚喷支护,加上毛洞模型作为参考模型,4种平面模型形成三维模型后,置入大型真三轴模型试验机,在模型边界相同的条件下对软岩隧道的支护方法进行研究。试验结果表明:不同的支护方式具有不同的超载能力和不同的破坏特点;该相似模型材料对软岩大变形特点具有良好的适用性。试验还为软岩隧道支护设计提供了可靠的研究基础。

Research and analysis of comparative tests of optimization of methods for reinforcing soft surrounding rock of tunnel

In order to solve the problem of optimum supporting design of tunnel engineering with soft surrounding rock, a similar material of model of which the mechanical curve is similar to the origional rock is developed. The physical models corresponding with the cases which are usually used in soft rock engineering such as bolt supporting case, bolt and jetting supporting case , lengthed bolt and jetting supporting case, are made.As well as the bare tunnel case, the four models form a 3D model and are put into the large scale real triaxial physical model machine. So the research on supporting design of soft rock tunnel is base on the same boundary condition of model. The test results demonstrate that various supporting methods lead to various over loaded abilities and various failure character. The similar material is fit for the trait of large deformation of soft rock. The research provides reliable foundation for supporting design of soft rock tunnel as well.