浅埋卵石土层隧道地表注浆加固技术数值模拟分析

Study on the Application of Surface Grouting Reinforcement Technology in Shallow Gravel Tunnel

针对石羊岭隧道浅埋卵石土层段围岩破碎、自稳能力差,在施工中易引起大变形、坍塌、地表沉陷等工程问题,对该浅埋段采用地表注浆加固处理后进行三台阶法施工。通过Midas/GTS软件对隧道浅埋卵石段地表注浆效果进行数值模拟。结果表明:地表注浆对卵石土层加固效果较好,可有效增强上部岩土体的力学参数,并大幅减小围岩变形。

In view of the engineering problems such as broken surrounding rock and poor self stabilizing ability in shallow pebble soil section of Shiyangling Tunnel,it is easy to cause large deformation,collapse and surface subsidence during construction,the shallow buried section is reinforced by surface grouting and then constructed by three steps method.Midas/GTS software is used to simulate the surface grouting effect of shallow buried pebble section of tunnel.The results showed that surface grouting has a good effect on strengthening pebble soil layer,which can effectively enhance the mechanical parameters of upper rock and soil mass and greatly reduce the deformation of surrounding rock.