兰渝铁路木寨岭隧道变形机理及变形控制技术研究

Research on Deformation Mechanism and Deformation Control Technology of Muzhailing Tunnel in Lanzhou-Chongqing Railway

兰渝铁路木寨岭隧道地质条件极为复杂特殊,施工期间出现强烈变形和严重破坏.依托兰渝铁路木寨岭隧道,结合现场测试及试验段施工情况,分析了挤压性围岩变形机理、变形特征及变形控制技术.分析结果表明,高地应力、地层岩性及地下水是挤压性围岩变形影响主要因素,挤压性围岩变形具有速率高、变形量大、变形持续时间长、来压快、支护受力大、不对称性等特点,减少扰动、多重支护和锚注联合支护体系、快速大刚度支护对控制变形具有明显的效果.

The geological conditions of Muzhailing Tunnel in Lanzhou-Chongqing Railway are extremely complicated and special,and the construction period has been severely deformed and damaged.Based on the Muzhailing Tunnel,the deformation mechanism,deformation characteristics and deformation control technology of the extruded surrounding rock are analyzed combined with the field test and the test section construction situations.Analysis results show that the high ground stress,formation lithology and groundwater are the main factors that influencing the deformation of extruded surrounding rock.The deformation is characterized by high rate,large amount,long duration,quick to pressure,large supporting force and asymmetry,and it has obvious effects on controlling deformation by reducing disturbance,multiple supporting,bolting combined grouting support system as well as rapid large stiffness supporting.