软岩大变形隧道施工质量控制研究

Research on Construction Quality Control of Soft Rock Large Deformation Tunnel

软岩大变形主要是由深埋隧道高地应力、富水情况或通过断层破碎带所造成。本文通过分析江木拉隧道软岩大变形施工情况,发现软岩变形危害主要是初支开裂和剥落掉块;采取超前大管棚、增加锁脚、型钢支护、周边围岩注浆等支护加强措施,能减少隧道变形量及变形速率;结合超前地质预报、隧道设计文件及附近断面监控量测数据分析情况,及时调整隧道支护参数,能降低软岩对施工带来的不良影响。

The large deformation of soft rock is mainly caused by high ground stress in deep buried tunnels,water-rich conditions or through fault fracture zones.This paper analyzes the construction of large deformation of soft rock in Jiangmula Tunnel,and finds that the main damage of soft rock deformation is the cracking of the initial support and the peeling off blocks.Strengthening measures such as advanced large pipe shed,increased lock foot,steel support,surrounding rock grouting support can reduce the amount of tunnel deformation and deformation rate.Combined with advanced geological forecast,tunnel design documents and monitoring and measurement data analysis of nearby sections,timely adjustment of tunnel support parameters can reduce the adverse effects of soft rock on construction.