考虑地下连续墙接缝的深基坑RFD系统研究  

Investigation into RFD system for deep excavation considering diaphragm wall joints

作　　者：THENDAR Yoshua LIM Aswin THENDAR Yoshua;LIM Aswin(Department of Civil Engineering,Universitas Katolik Parahyangan,Bandung,40141,Indonesia)

机构地区：[1]万隆天主教大学土木工程系,印度尼西亚万隆40141

出　　处：《岩土力学》2024年第12期3717-3727,共11页Rock and Soil Mechanics

摘　　要：刚性固定地下连续墙(rigid and fixed diaphragm wall,RFD)是一种新型的无支撑挡土墙系统,该系统需要隔板之间刚性连接。然而,在印度尼西亚,很少在连续墙隔板之间使用刚性连接。主要研究在考虑地下连续墙隔板接缝引起的各向异性因素的情况下,RFD系统对侧墙挠度和开挖稳定性的影响。首先通过位于雅加达中部的一个支撑开挖案例,验证了三维有限元模型的土体和结构参数。然后将RFD系统引入到三维模型中,通过改变几个参数进行了一些参数研究,以了解它们对安全系数和墙体挠度的影响。分析结果表明,RFD系统的实施有利于控制侧向变形。扶垛墙的长度和盖板的使用显著影响开挖变形和安全系数,而横墙和扶垛墙的深度影响较小。地下连续墙隔板接缝的存在使墙体各向异性,从而导致墙体刚度降低,进而导致墙体侧向变形的增加和开挖安全系数的降低。The rigid and fixed diaphragm wall(RFD)is a novel strut-free retaining wall system.This system needs a rigid connection between diaphragm panels.However,in Indonesia,constructing the rigid connection between diaphragm wall panels is scarce.The main objective of this study is to investigate the effectiveness of the RFD system on lateral wall deflection and excavation stability considering anisotropic factors due to joints in the diaphragm wall panels.First,the soil and structure parameters of the three-dimensional finite element model were validated through a well-documented braced excavation case history,which is located in Central Jakarta.Then,the RFD system was introduced to the 3D model.Some parametric studies were also conducted by varying several parameters to understand their influence on safety factors and wall deflections.The analysis results indicate that the implementation of the RFD system yields positive outcomes in controlling lateral deformations.The length of buttress walls and the use of cap slabs significantly affect excavation deformations and safety factors,while the depth of cross walls and buttress walls has a less significant impact.The presence of joints in the diaphragm wall panels causes the wall to be anisotropic,resulting in a reduction in wall stiffness.The reduction in wall stiffness leads to an increase in lateral wall deformations and a decrease in the excavation safety factor.

关 键 词：深基坑 RFD系统 地下连续墙 各向异性 侧向位移 安全系数 有限元法 

分 类 号：TU473[建筑科学—结构工程]