高地应力软岩大变形隧道施工技术

Construction Techniques for a Tunnel in Highly Deformed Soft Rock with High Ground Stress

两水隧道为双线铁路隧道,穿过志留系千枚岩地层,施工中多处出现大变形,反复出现初期支护侵限,安全风险高,施工难度极大。由于有针对性地采取了调整支护参数、加大变形预留量、自进式长锚杆锁脚、微台阶施工工艺等变形控制措施和施工技术,有效地控制了大变形。文章分析了两水隧道高地应力软岩特点和大变形特征,对高地应力软岩隧道施工进行了有益的探索。

The construction of the double-track Liangshui tunnel passing through the phyllite strata of the Silurian system was risky and difficult since deformation occurred at several places and the primary support invaded the clearance. Some measures taken to address these issues included parameter adjustment, larger deformation allowance, self-drilling long anchoring, and micro-bench construction technology. This paper analyzes the features and deformation characteristics of the soft rock with high ground stress around the Liangshui tunnel.