圆形地连墙接缝刚度弱化对地面沉降的影响  

Settlement effect of joint stiffness weakening of circular diaphragm walls

作　　者：王汉辉 闵征辉 许建聪[3] WANG Hanhui;MIN Zhenghui;XU Jiancong(CISPDR Corporation,Wuhan 430010,China;Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]长江设计集团有限公司,湖北武汉430010 [2]长江勘测规划设计研究有限责任公司,湖北武汉430010 [3]同济大学地下建筑与工程系,上海200092

出　　处：《人民长江》2024年第11期190-197,共8页Yangtze River

基　　金：中央高校基本科研业务费专项资金项目(22120180312);国家自然科学基金-雅砻江联合基金项目(U1765110)。

摘　　要：目前,在土岩组合地层中深大圆形竖井的设计和施工方面经验尚缺。为了确保罗田水库—铁岗水库输水隧洞深78 m、直径34.9 m的圆形竖井施工安全和顺利进行,采用大型有限元软件ABAQUS建立了精细化的三维弹塑性有限元数值模型,分析了地连墙施工过程中周边地层的变形特性。通过将是否考虑地连墙接缝刚度弱化的数值计算结果与实测值进行比较,探究了地连墙接缝刚度弱化对墙顶、地表和箱涵的沉降影响。研究结果表明:对于距离竖井较近的地面、箱涵及地连墙墙顶的沉降,考虑地连墙接缝刚度弱化的数值计算结果与实测值的最大平均相对误差分别为10.11%,1.728%和16.49%,较为相符;而接缝刚度无弱化的数值计算结果与实测值的最大平均相对误差为83.02%,3.395%和139.6%,相差较大。研究结果可为超深大直径竖井及地连墙设计提供参考。At present,design and construction experiences of deep and large circular shafts in soil-rock combination strata are still much insufficient.In order to ensure the safe construction of the circular shaft of 78 m depth and 34.9 m diameter in Luotian-Tiegang Reservoir water conveyance tunnel project,an elaborate three-dimensional elastic-plastic finite element numerical model was established using ABAQUS,and adjacent stratum deformation characteristics during diaphragm walls construction were studied.By comparing the measured values with the simulated results,with and without considering the stiffness weakening of diaphragm wall joints,we analyzed the impacts of the stiffness weakening of diaphragm wall joints on the deformations of the wall top,the ground,and the adjacent box culvert structure.The results showed that for the settlements of ground,the box culvert near the shaft,and the top of the diaphragm wall,the maximum average relative errors between the measured values and the numerical calculation values considering the weakening of diaphragm wall joint stiffness were 10.11%,1.728% and 16.49%,respectively,in good agreement with the measured values;while the maximum average relative errors between the measured values and the numerical calculation values without the joint stiffness weakening were 83.02%,3.395% and 139.6%,respectively,significantly different from the measured values.The results can be used as a reference for design of super deep and large-diameter shafts and diaphragm walls.

关 键 词：圆形地连墙 接缝刚度弱化 沉降效应 精细化数值模拟 罗田水库—铁岗水库输水隧洞 

分 类 号：U455.8[建筑科学—桥梁与隧道工程]