(浙江省建筑设计研究院, 杭州 310006)

摘要: 井筒式地下立体车库占地面积小、开挖深度大、停车数量多,适用于解决老旧城区停车难。 首先在介绍先后建成的 3 个工程案例的结构形式和监测数据后,总结超深地下立体车库结构计算的主要问题;然后以开挖深度为 46. 2m 的杭州景芳园项目为例,分别利用三维连续介质有限元方法建立的地基-结构模型和结构-荷载模型,分析空间效应对结构的影响;最后以监测数据为参照,通过对比不同插入深度地下连续墙的内力和变形,分析有限元法和弹性支点法的计算精度。 分析结果表明:井筒式地下立体车库结构可综合沉井和明挖地下室的做法,结合地下水处理和结构内力变形,选择合适的支护结构插入深度;对地下连续墙墙身最大弯矩和最大水平位移而言,三维有限元计算值是实测值的 1. 25 倍以上,弹性支点法计算值是实测值的 2 倍左右。

关键词: 井筒式地下立体车库; 超深地下立体车库; 空间效应; 插入深度; 逆作法; 地下连续墙

中图分类号:TU470+. 3 文献标志码:A 文章编号:1002-848X(2022)15-0146-07

DOI:10. 19701 / j. jzjg. ZIAD2225

Study on calculation method of ultra-deep underground shaft-type stereo garage structure

LI Ying, XIE Xirong, LIU Xingwang, CHEN Dong, TONG Xing, ZHANG Jinhong

( Zhejiang Province Institute of Architectural Design and Research, Hangzhou 310006, China)

Abstract: The underground shaft-type stereo garage has the obvious characteristics of small plane area, large excavationdepth and large number of parking, which was helpful to solve the problem of parking difficulty in old residential areas anddowntown areas. Firstly, after introducing the structural types and monitoring data of three engineering cases completedsuccessively, the main problems in the calculation of ultra-deep underground stereo garage structure were summarized.Then, taking Hangzhou Jingfangyuan project with excavation depth of 46. 2m as study background, the foundation-structuremodel and the structure-load model established by the three-dimensional continuum finite element method were respectivelyused to analyze the influence of the space effect on the structure. Finally, using the monitoring data as a reference, thecalculation accuracy of the finite element method and the elastic fulcrum method were analyzed by comparing the internalforce and deformation of the underground diaphragm wall with different insertion depths. The analysis results showed thatunderground shaft-type stereo garage structure should integrate with the practice of caisson and open excavation basement toselect the appropriate excavation method and insertion depth of retaining structure by combined with groundwater treatmentand structural stress and deformation. For the maximum bending moment and maximum horizontal displacement ofunderground diaphragm wall, the calculation value of the three-dimensional finite element was more than 1. 25 times of themeasured value, and the calculation value of the elastic fulcrum method was about 2 times of the measured value.

Keywords:underground shaft-type stereo garage; ultra-deep underground stereo garage; space effect; insertion depth;inverse building method; underground diaphragm wall

∗国家自然科学基金(52078466) ,浙江省建设科研项目(2019K002、2019K003、2020K110) 。

第一作者:李瑛,博士,正高级工程师,注册土木工程师(岩土) ,主要从事深基坑工程的设计、咨询和研究,Email: liying3104@163. com。

[引用本文] 李瑛,谢锡荣,刘兴旺,等. 井筒式超深地下立体车库结构计算方法研究 [ J] . 建筑结构,2022,52(15) : 146-152. LI Ying, XIE Xirong, LIU Xingwang, et al. Study on calculation method of ultra-deep undergroundshaft-type stereo garage structure[ J] . Building Structure,2022,52(15) :146-152.