考虑空间效应的基坑开挖对邻近隧道影响分析  

Influence Analysis on Adjacent Tunnel Induced by Foundation Pit Excavation Considering Spatial Effect

作　　者：朱春柏 钱栋栋 余忠祥 过锦 胡海波[4,5] Zhu Chunbai;Qian Dongdong;Yu Zhongxiang;Guo Jin;Hu Haibo(CRRC Construction Engineering Co.,Ltd.,Beijing 100078,P.R.China;Jiangsu CRRC Urban Development Co.,Ltd.,Suzhou Jiangsu 214105,P.R.China;Hangzhou Binjiang Real Estate Group Co.,Ltd.,Hangzhou 310016,P.R.China;Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,P.R.China;Engineering Research Center of Urban Underground Development of Zhejiang Province,Hangzhou 310058,P.R.China)

机构地区：[1]中车建设工程有限公司,北京100078 [2]江苏中车城市发展有限公司,江苏苏州214105 [3]杭州滨江房产集团股份有限公司,杭州310016 [4]浙江大学滨海和城市岩土工程研究中心,杭州310058 [5]浙江省城市地下空间开发工程技术研究中心,杭州310058

出　　处：《地下空间与工程学报》2023年第5期1471-1477,共7页Chinese Journal of Underground Space and Engineering

摘　　要：基坑开挖引起的围护结构变形将引起周边土体的卸荷,而土体卸荷将会对邻近隧道附加变形及内力产生不利影响。考虑围护结构变形的空间效应,建立了基于基坑侧壁位移影响的三维土压力卸载计算模型,并借助Mindlin解得到了基坑开挖卸荷在隧道轴线处引起的附加应力。考虑地基土体变形连续性,将隧道视为置于Pasternak地基的Euler-Bernoulli梁,得到了隧道附加变形的受力响应。将基坑开挖引起的附加荷载施加于邻近隧道,得到了考虑空间效应的基坑开挖诱发邻近隧道附加变形的理论计算方法。通过与已有案例的对比分析,验证了本文方法的可靠性。进一步分析了围护墙最大变形、隧道与基坑边距离及地基模量等因素的影响规律,结果表明:围护墙最大变形的增大会进一步增加隧道的变形及内力,而隧道与基坑边距离及地基模量的增加,则会减小隧道的附加变形及内力。The deformation of retaining structures induced by the excavation will cause the change of the earth pressure,which will have an adverse impact on the additional deformation and internal force of adjacent tunnels.Combining the earth pressure with the deformation of the diaphragm wall,a three-dimensional unloading earth pressure calculation model is established considering the spatial effect of excavation.Mindlin's solution is used to calculate the additional stress at the tunnel axis.The tunnel is regarded as a continuous Euler-Bernoulli beam resting on the Pasternak foundation which considers the continuity of soil deformation,and the response of the tunnel under additional load is obtained.Applying the additional load caused by the excavation to the adjacent tunnel,theoretical method for calculating the additional deformation of tunnels considering spatial effect is obtained.Compared with the history case,the reliability of the method is proved.By applying the method,the influence laws of the maximum deformation of the retaining wall,the distance between the tunnel and the foundation pit and the soil modulus are further analyzed.The research results show that:the increase of the maximum deformation of the diaphragm wall will further increase the deformation and internal force of the tunnel,while the increase of the soil modulus and distance between the tunnel and foundation pit will reduce the additional deformation and internal force of the tunnel.

关 键 词：基坑开挖 围护结构变形 隧道变形 两阶段法 空间效应 

分 类 号：TU43[建筑科学—岩土工程]