某港区事故应急池超深圆筒结构地下连续墙支护计算  

Calculation of diaphragm wall support in deep cylindrical structures for emergency pool in port areas

作　　者：顾宽海 陈梦 李仁宝 谢万东[3] GU Kuanhai;CHEN Meng;LI Renbao;XIE Wandong(CCCC Third Harbor Consultants Co.,Ltd.,Shanghai 200032,China;Shandong Port Rizhao Port Group Co.,Ltd.,Rizhao 276800,China;CCCC-FHDI Engineering Co.,Ltd.,Guangzhou 510290,China)

机构地区：[1]中交第三航务工程勘察设计院有限公司,上海200032 [2]山东港日照港集团有限公司,山东日照276800 [3]中交第四航务工程勘察设计院有限公司,广东广州510290

出　　处：《水运工程》2023年第9期21-27,64,共8页Port & Waterway Engineering

摘　　要：圆形地下连续墙支护结构具有三维拱效应,抵抗变形和承载能力较好,逐渐应用于基坑工程,但也面临墙身受力变形复杂、计算方法多样、环向刚度取值不确定等问题。本文以岚山港区直径65 m圆形事故应急池地连墙支护为例,分别采用环向等效刚度二维m值法和三维m值法建模分析,对比实测数据,结果表明:此类结构空间效应强,二维计算的侧向变形、竖向弯矩偏大,三维计算更真实模拟开挖过程;当采用二维m值法计算时,环向刚度折减系数宜取0.8,采用三维m值法计算时宜取0.5;当采用圆形地连墙支护时,墙后采用静止土压力计算较为合理。The circular underground diaphragm wall supporting structure with three-dimensional arch effect is gradually used in foundation pit projects because of its better resistance to deformation and load-bearing capacity.But it also faces problems such as complex force deformation of the wall,various calculation methods,and uncertainty in the value of circumferential stiffness.In this paper,taking the 65 m diameter circular accident emergency pool ground connection wall support in Lanshan port area as an example,the two-dimensional m-value method and the three-dimensional m-value method were used to model and analyze considering the annular equivalent stiffness respectively,and compared with the actual measured data.The results show that the structures have strong spatial effects,and the lateral deformation and vertical bending moment derived from two-dimensional calculation are relatively large,while three-dimensional calculation can more realistically simulate the excavation process.When the two-dimensional m-value method is used,it is more appropriate to take 0.8 for the circumferential stiffness reduction factor,and 0.5 for the three-dimensional m-value method.When the circular ground link wall support is used,it is more reasonable to use static earth pressure after the wall.

关 键 词：圆形地下连续墙 环向等效刚度 二维m值法 三维m值法 环向刚度折减系数 

分 类 号：TU473[建筑科学—结构工程] U65[建筑科学—土工工程]