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为解决泥岩隧洞某洞段在施工完成后围岩突然发生持续大变形的问题,综合隧洞开挖揭露的地质条件和实测变形规律,并进行相应数值分析试验,研究发现原因是隧洞围岩中存在隔水层,后续的开挖导致围岩隔水层破坏,使原先处于干燥状态的围岩遭受地下水浸泡而软化,导致本已趋于稳定的隧洞重新发生收敛变形和支护结构破坏。经过对处理措施的数值试验研究和现场实际效果综合对比分析,发现采取以排导为主的方案是较为合理、经济、有效的处理措施。
In order to solve the problem of continuous large deformation of surrounding rock suddenly after the completion of construction in a certain section of mudstone tunnel, the geological conditions and measured deformation rules exposed by tunnel excavation are comprehensively analyzed and the corresponding numerical analysis tests are carried out. The reason is that there exists in tunnel surrounding rock The aquitard and the subsequent excavation lead to the destruction of the aqueduct of the surrounding rock, which makes the surrounding rock, which was originally in a dry state, soaked and softened by the groundwater, resulting in the convergence and deformation of the already stabilized tunnel and the destruction of the support structure. After a comprehensive comparison and analysis of the numerical experimental study on the treatment measures and the actual results on the spot, it is found that adopting a scheme based on drainage is a more reasonable, economical and effective treatment measure.