摘要
Abstract
To investigate the impact of acidic dry-wet cycles on the stability of tuff tunnels during construction,this study integrates laboratory mechanical testing with numerical simulations to systematically analyze the deterioration patterns of tuff under such conditions and their influence on tunnel surrounding rock stability.The test results indicate that acidic dry-wet cycles significantly accelerate the degradation of tuff,with the first cycle causing the most notable reductions in strength and elastic modulus.The degradation coefficient of the elastic modulus decreases by 40％in an acidic environment,suggesting that acidic media exacerbate the deterioration of surrounding rock properties.The cohesion and internal friction angle of tuff decrease by approximately 22％and 25％,respectively,under acidic dry-wet cycles,leading to increased deformation of the surrounding rock during tunnel excavation.This also results in stress concentration near the support structure,increasing the risk of localized failure.The findings provide theoretical support for construction safety control and long-term stability of tunnels in acidic environments and offer valuable references for similar engineering projects.关键词
凝灰岩/酸性干湿循环/力学特性/隧道变形Key words
tuff/acidic dry-wet cycles/mechanical properties/tunnel deformation分类
建筑与水利
