隧道锚与隧道上下毗邻协同施工力学行为分析  

Mechanical Behavior Analysis of the Upper and Lower Adjacent Synergistic Construction of Tunnel Anchor and Tunnel

作　　者：杨先奎 许建凯 王保 苑庆峰 刘赐文 刘畅 王朝国 陈元忠 YANG Xiankui;XU Jiankai;WANG Bao;YUAN Qingfeng;LIU Ciwen;LIU Chang;WANGChaoguo;CHEN Yuanzhong(China Railway Development Investment Group Co.,Ltd.,Kunming 650501,China;Guizhou Wengkai Expressway Development Co.,Ltd.,Guiyang 550306,China;China Railway Guangzhou Engineering Group Co.,Ltd.,Guangzhou 511466,China;College of Civil Engineering,Guizhou University,Guiyang 550025,China;Guizhou Highway Engineering Group Co.,Ltd.,Guiyang 550001,China)

机构地区：[1]中铁开发投资集团有限公司,昆明650501 [2]贵州瓮开高速公路发展有限公司,贵阳550306 [3]中铁广州工程局集团有限公司,广州511466 [4]贵州大学土木工程学院,贵阳550025 [5]贵州省公路工程集团有限公司,贵阳550001

出　　处：《路基工程》2023年第4期143-149,共7页Subgrade Engineering

摘　　要：为确定隧道锚与隧道上下毗邻协同施工最佳的施工工况,依托翁开高速四坪隧道工程,利用数字模拟手段对围岩竖向位移、塑性状态和初支内力进行分析,对比分析了三种不同工况下的围岩位移、塑性状态和初支内力的情况。结果表明:采用先施工主隧道再施工隧道锚,围岩的竖向位移最大;当采用先施工隧道锚再施工主隧道时,围岩的竖向位移最小还能有效减小塑性区范围,随着土体黏聚力的增大总体位移值和塑性区范围减小;上、中台阶支护连接部位内力较大,因此,应适当采取初支加强措施,保证在施工阶段支护的稳定性。In order to determine the best construction conditions of the upper and lower adjacent synergistic construction of tunnel anchor and tunnel,based on the Wengkai Expressway Siping Tunnel project,the vertical displacement,plastic state and initial support internal force of surrounding rock were analyzed by means of digital simulation,and the surrounding rock displacement,plastic state and initial support internal force under three different working conditions were compared and analyzed.The results show that when the main tunnel is constructed first and then the tunnel anchor is constructed,the vertical displacement of the surrounding rock is the largest.When the tunnel anchors are constructed first and then the main tunnel is constructed,the vertical displacement of the surrounding rock is minimum and can effectively reduce the scope of the plastic zone.With the increase of soil cohesion,the overall displacement value and the range of plastic zone decrease;the internal force of the upper and middle step support connections is relatively large,so appropriate measures to strengthen the initial support should be taken to ensure the stability of the support during the construction stage.

关 键 词：围岩竖向位移 塑性状态 初支内力 稳定性分析 敏感性分析 

分 类 号：U455[建筑科学—桥梁与隧道工程]