摘要
基坑围护结构变形会对坑外一定范围内的土体产生扰动,进而影响邻近既有隧道。为保证隧道的正常使用和安全,需要确定基坑与隧道的安全距离。本文以《基坑工程技术规范》中规定的围护结构最大变形值作为位移边界条件,用位移控制有限元法研究基坑围护结构变形对隧道的扰动规律,分析基坑与隧道不同的相对位置和基坑等级对隧道的影响。研究结果表明:基坑侧方土体的扰动范围受基坑宽度影响较小,而主要受基坑深度(对应不同基坑等级)影响明显。基坑越深土体的扰动范围越大,其形状大致呈"倒三角形"。最后,根据15 mm扰动控制量划定了基坑邻近隧道所需的保护距离,为建立隧道保护标准提供参考。
The deformation of the foundation pit supporting structure will disturb the soil in a certain range outside the pit and then affect the adjacent existing tunnels. To ensure the normal use and safety of the tunnel, it is necessary to determine the safe distance between the foundation pit and the tunnel. In this paper, the maximum deformation value of the retaining structure specified in the "Technical Specifications for Foundation Pit Engineering" is used as the displacement boundary condition, the displacement control finite element method is used to study the disturbance rule of the retaining structure to the tunnel and analyze the influence of the two different relative position and foundation pit levels on the tunnel. The research results show that the disturbance range of the side soil of the foundation pit is less affected by the width of the foundation pit but is mainly affected by the depth of the foundation pit(corresponding to different foundation pit levels). The deeper the foundation pit, the larger the disturbance range of the soil, and its shape is roughly "inverted triangle". Finally, based on the 15 mm disturbance control amount, the required protection distance of the foundation pit adjacent to the tunnel is delineated, which provides a reference for establishing tunnel protection standards.
作者
卞荣
贺雷
严远忠
吴冰
BIAN Rong;HE Lei;YAN Yuanzhong;WU Bing(State Grid Zhejiang Electric Power Company Economic and Technological Research Institute1,Hangzhou 310012,China;China Electric Power Research Institute,Beijing 102401,China;Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《建筑结构》
CSCD
北大核心
2021年第S02期1532-1537,共6页
Building Structure
基金
国网浙江省电力有限公司科技项目资助(SGZJJY00SJJS1900122)
关键词
基坑
既有隧道
安全距离
位移控制有限元
软土
foundation
existing tunnel
safety distance
displacement control finite element
soft soil
