水力发电2025，Vol.51Issue(3)：57-63,70,8.
悬臂掘进机"S"形开挖路径对小断面软岩输水隧洞稳定性的影响
Influence of S-shaped Excavation Path of Roadheader on the Stability of Small-section Soft Rock Water-conveyance Tunnel
摘要
Abstract
Taking the Wutongmiao small-section mudstone water-conveyance tunnel of Tingzikou Irrigation Area in Sichuan as an example,a multi-footage excavation model of the tunnel is established to analyze the evolution characteristics and laws of the plastic zone of tunnel surrounding rock,the crown settlement and the convergence deformation under two S-shaped excavation paths of roadheader from top to bottom and from bottom to top.The influences of the two paths on the excavation stability of soft rock tunnels are compared,and the reliability of numerical model is verified based on field measured data.The results show that,(a)the bottom-to-top path causes greater disturbance to adjacent surrounding rock in the early stage of tunnel excavation,the surrounding rock plastic zone and weak zone formed by the top-to-bottom path are larger after the excavation of the face is completed,and the ratio of the maximum span of plastic zone formed on the side walls of tunnel to the maximum span of plastic zone formed at the bottom of tunnel under two excavation paths is close to 2;(b)the soft rock tunnel crown settlement caused by the top-to-bottom path is more significant than that caused by the bottom-to-top path,and the creep morphological characteristics of the footage-section are more obvious in the former;(c)the change degree of horizontal survey line distance of tunnel convergence deformation under the two excavation paths is similar,while the two oblique survey line distances is more convergent under the top-to-bottom path;and(d)the bottom-to-top path has a better adaptability to soft rock excavation.关键词
悬臂掘进机/"S"形开挖路径/软岩隧洞/围岩稳定性/塑性区/拱顶下沉/净空收敛Key words
roadheader/S-shaped excavation path/soft rock tunnel/surrounding rock stability/plastic zone/crown settlement/convergence deformation分类
土木建筑引用本文复制引用
朱明星,王东,陈浩哲,温友鹏..悬臂掘进机"S"形开挖路径对小断面软岩输水隧洞稳定性的影响[J].水力发电,2025,51(3):57-63,70,8.基金项目
国家自然科学基金资助项目(42377150) （42377150）
国家重点研发计划项目(2022YFB2603000) （2022YFB2603000）
