全风化花岗岩小净距隧道中夹岩柱注浆加固技术

根据天马山隧道工程实践,利用ABAQUS建立数值模型,从施工时力学的角度,对先行洞开挖后小净距隧道中夹岩柱加固前后的受力变形情况进行了数值模拟分析,计算结果表明:对中夹岩柱加固后,其力学性能增强,承载能力提高,在隧道开挖的过程中,靠近中夹岩柱一侧的初衬混凝土层拉应力区域明显减小。

The rock pillar grouting reinforcement technology of whole weathered granite small spacing tunnel

According to the Tianmashan tunnel project example,this paper used ABAQUS to establish the numerical simulation,from the con-struction mechanics point of view,made numerical simulation analysis on the stress and deformation situation of advance excavation small spacing tunnel middle rock pillar before and after reinforcement,the calculation results showed that：after middle rock column reinforcement,its mechani-cal properties enhanced,the bearing capacity improved,in the process of tunnel excavation,the tensile stress area decreased of initial lining con-crete layer near the middle rock pillar side.