软土深基坑伺服钢支撑布置型式与施工工序优化分析  

Optimization Analysis of Layout and Construction Process of Servo Steel Structs of Deep Foundation Pit in Soft Soil

作　　者：陈金铭 狄宏规[2] 吴强 陈杰 林定雄 周晓宇 林如辉 CHEN Jinming;DI Honggui;WU Qiang;CHEN Jie;LIN Dingxiong;ZHOU Xiaoyu;LIN Ruhui(Ningbo Rail Transit Group Co.,Ltd.,315012,Ningbo,China)

机构地区：[1]宁波市轨道交通集团有限公司,宁波315012 [2]同济大学上海市轨道交通结构耐久性与系统安全重点实验室,上海201804 [3]宏润建设集团股份有限公司,宁波315700

出　　处：《城市轨道交通研究》2022年第3期156-161,共6页Urban Mass Transit

基　　金：国家自然科学基金青年基金项目(51808405)。

摘　　要：基于宁波轨道交通某车站基坑的现场实测数据,分析了伺服钢支撑与普通钢支撑的支撑效果。通过建模,对伺服支撑设计方案及施工工序对基坑变形的影响进行优化。结果表明:与普通钢支撑段相比,伺服钢支撑段地下连续墙的最大累计水平变形更小;将基坑施工工序调整为先开挖伺服钢支撑段后开挖普通钢支撑段,普通钢支撑段和伺服钢支撑段地下连续墙的最大累计水平变形平均值分别减小了2.36 mm和2.19 mm;在施工工序优化的基础上,将伺服钢支撑由原来的三、五道相隔布置分别调整为四、五道相邻布置和三、四道相邻布置后,地下连续墙的最大水平累计变形分别减小了2.92%、22.44%。The supporting effect of servo steel struts and common steel structs is analyzed based on the field measurement data of certain station foundation pit project of Ningbo Rail Transit.The influence of servo steel struts design scheme and construction process on the foundation pit deformation is optimized through modeling.Results show that compared with ordinary steel structs section,the maximum horizontal cumulative deformation of diaphragm wall servo steel struts section is smaller.If the construction process is adjusted to first excavating servo steel struts section then the ordinary steel struts section,the average maximum horizontal cumulative deformation of ordinary steel struts section and servo steel struts section is reduced by 2.36 mm and 2.19 mm respectively.On the basis of construction process optimization,by adjusting arrangement of servo steel struts from 3rd and 5th struts spaced apart to adjacent 4th,5th struts and 3rd,4th struts,the maximum horizontal cumulative deformation of the diaphragm walls is reduced by 2.92%and 22.44%respectively.

关 键 词：软土深基坑 地下连续墙 伺服钢支撑 侧向变形 支撑布置 施工工序 

分 类 号：TU472[建筑科学—结构工程]