深埋高压富水区岩溶隧道围岩开挖稳定性影响因素分析  

Analysis on influencing factors of excavation stability of karst tunnel in deep buried high-pressure and water-rich area

作　　者：周利梅 ZHOU Limei(Chongqing Telecommunication Polytechnic College,Chongqing 402247,China)

机构地区：[1]重庆电讯职业学院,重庆402247

出　　处：《邵阳学院学报（自然科学版）》2021年第1期67-75,共9页Journal of Shaoyang University：Natural Science Edition

基　　金：重庆市教育委员会2018年度科技项目(KJQN201805503);重庆市教育委员会高等职业技术院校新技术推广项目(GZTG201619);重庆市教育委员会2018年度科技项目(KJQN201805501)。

摘　　要：依托工程实例,对岩溶隧道处于深埋高压富水区域时围岩开挖失稳的影响要素展开分析。研究结果表明:隧道开挖后隧道周围逐渐产生闭合型塑性变形且塑性区域不断扩大,位移场变化云图形式泡状;隧道埋深、地下水位高度、围岩级别3种因素变化对隧道不同部位的影响程度不同,受埋深变化影响最大处发生在拱脚部位,受地下水高度变化影响最大处发生在拱底部位,受围岩级别影响最大处发生在拱顶部位;现场监控的最终拱顶沉降值为-25.05 mm,水平收敛值为-14.53 mm,考虑渗流力的结果更加接近监控结果,验证了文中分析方法的合理性,这也为以后类似项目提供一定的理论支撑。Based on the engineering example,the influence factors of surrounding rock excavation instability were analyzed when the karst tunnel was in the deep-buried high-pressure and water-rich area.The results show that,after the tunnel excavation,the closed plastic deformation gradually occurs around the tunnel,and the plastic area continues to expand,and the displacement field changes.The influence of the three factors of tunnel buried depth,groundwater level and surrounding rock level on different parts of the tunnel is different,the most affected part by the change of buried depth occurs at the arch foot,the most affected part by the change of groundwater level occurs at the arch bottom,and the most affected part by the surrounding rock level occurs at the arch top;the final vault settlement value monitored on site is-25.05 mm while the horizontal convergence value is-14.53 mm.The results of seepage force considered in this paper are closer to the monitoring results,which verifies the rationality of the analysis method in this paper and also provides some theoretical support for similar projects in the future.

关 键 词：深埋 富水区 岩溶隧道 围岩开挖稳定性 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]