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隧道施工穿越富水软弱围岩时常发生塌方地质灾害,给工程建设带来困难。该文依托江西省昌宁高速公路莲花山隧道塌方实例,运用多物理场耦合模拟软件对典型断面进行流固耦合数值计算,定量分析了富水软弱围岩隧道塌方过程中围岩和支护结构的应力、位移以及渗流场响应特征,研究了塌方发生机理。基于稳固处治原则,采取了包含塌体稳固、塌方影响段加固、塌方情况物理探测、管棚支护参数设计、塌方段洞内管棚注浆支护、短开挖强支护的综合治理技术措施。围岩变形监测结果表明:塌方处治效果较好。
Tunnel construction through the weak water-rich rocks often occur landslides geological disasters, to the construction of the project to bring difficulties. Based on the example of Lianhuashan tunnel collapse in Changning Expressway, Jiangxi Province, the numerical simulation of fluid-solid coupling of typical sections is carried out by using multiphysics coupled simulation software to quantitatively analyze the surrounding rock and supporting structure in the process of tunnel collapse The stress, displacement and seepage field response characteristics of the landslide mechanism. Based on the principle of stable treatment, the comprehensive treatment technology including solid collapse, the reinforcement of landslide affected sections, physical detection of landslides, parameter design of pipe shed support, grouting support of pipe shed in collapsed sections, short excavation and strong support are taken Measures. Surrounding rock deformation monitoring results show that: landslide treatment effect is better.