Effects of jet grouting slabs on responses for deep braced excavations  

作　　者：Wengang Zhang Li Hong Yongqin Li Runhong Zhang Anthony T.C.Goh Hanlong Liu 

机构地区：[1]School of Civil Engineering,Chongqing University,Chongqing,China [2]Key Laboratory of New Technology for Construction of Cities on Mountain Area,Ministry of Education,Chongqing University,Chongqing,China [3]School of Civil and Environmental Engineering,Nanyang Technological University,Singapore

出　　处：《Underground Space》2021年第2期185-194,共10页地下空间（英文）

基　　金：the Chongqing Construction Science and Technology Plan Project(No.2019-0045);National Natural Science Foundation of Chongqing,China(No.cstc2018jcyjAX0632);Science and Technology Research Program of Chongqing Municipal Education Commission(No.KJZDK201900102).

摘　　要：Jet grouting slabs are widely used in deep excavations owing to their effectiveness for reducing the deflection of the diaphragm wall and the prop forces acting on the struts and improving the basal-heave stability.In this paper,according to case histories in Singapore,a series of finite-element numerical simulations are performed to evaluate the effects of jet grouting slabs on responses to deep braced excavations.On the basis of a parametric sensitivity study,a reasonable thickness of jet grouting slabs is proposed.The effects of the wall depth,wall stiffness,soft-clay thickness,and stiffness on the performance of the jet grouting slabs are assessed by comparing and analyzing a series of simulation results.It is found that the soft-clay thickness significantly affects the wall deflection and basal heave in deep excavation.During the design of support structures,soil profiles should be considered first.The findings of this study provide a reference and guidance for the support system design of similar projects.

关 键 词：Jet grouting slab Deep excavation Soft clay Finite-element analysis 

分 类 号：TU37[建筑科学—结构工程]