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围岩大变形是一种常见的、危害极大的施工地质灾害,为了减弱乃至消除此类灾害对工程的影响,首先,基于工程地质条件和地应力测试结果分析,揭示了典型地段软岩挤压大变形的成因;其次,采用有限差分程序研究了软岩段施工过程中围岩的受力和变形特征,分析了支护结构对围岩稳定性的影响,考虑支护有效抑制了围岩变形,将开挖造成围岩变形的影响范围由2倍洞径减至1倍洞径,较好地稳固了掌子面的挤压变形;最后,根据考虑支护的施工过程模拟结果分析,提出了该段软岩大变形控制措施及其变形过大造成侵限的具体处理对策,经开挖后监测数据验证,措施有效,确保了软弱破碎围岩隧道的顺利施工,对类似工程具有一定的借鉴意义。
Large deformation of surrounding rock is a common and extremely damaging construction geological disasters. In order to weaken and even eliminate the impact of such disasters on the project, firstly, based on the analysis of engineering geological conditions and stress test results, Secondly, the finite element method is used to study the force and deformation characteristics of surrounding rock during the construction of soft rock sections. The influence of supporting structures on the stability of surrounding rock is analyzed. Considering the support, the surrounding rock Deformation, excavation caused by surrounding rock deformation range from 2 times the hole diameter reduced to 1 times the hole diameter, and better stabilize the extrusion of the face of the nail; Finally, according to the support of the construction process simulation results, The control measures of large deformation of soft rock and the specific measures to deal with the infiltration caused by excessive deformation are put forward. After the excavation, the monitoring data verify that the measures are effective and ensure the smooth construction of soft and fragmented rock tunnel. The reference significance.