小间距隧道施工性态监测与稳定性分析

Rock stability analysis and site monitoring of mechanical behavior for excavation of closely adjacent tunnels

在分岔隧道施工过程中,小间距段支护体系力学性态直接反映分岔隧道的稳定状况,结合沪—蓉线庙垭分岔隧道,对小间距中墙薄弱处侧向加固进行了理论分析,通过对围岩变形和围岩压力、钢支撑内力、锚杆轴力等支护体系监测成果的系统分析,以及中墙爆破振动现场试验研究,评判了小间距隧道的稳定状况,所得结论可为日后同类工程的设计、施工、监测提供有益的借鉴。

The mechanical behavior of supporting system for closely adjacent tunnels is the direct indication of its safety in the excavation of diverging tunnels;combined practical work of Miaoya diverging tunnel with small interval in Hu-Rong Expressway, the lateral reinforcement theory of inter-space rock and site monitoring of closely adjacent tunnels are introduced;based on the results,the deformation of surrounding rock and mechanical behavior of supporting system are presented;together with the study on the field experiments for blasting vibration of inter-space rock,the stability of closely adjacent tunnels is evaluated;and the conclusions obtained will devote to the following studies.