铁道标准设计2019，Vol.63Issue(3)：26-33,8.DOI:10.13238/j.issn.1004-2954.201804020002
基坑开挖对邻近高铁路基变形影响的预测方法研究
Study on Prediction of the Influence of Foundation Pit Excavation on Deformation of Adjacent High-speed Railway Subgrade
摘要
Abstract
Focusing on a foundation pit engineering project in soft soil area,the method for the prediction of the influence of the excavation on deformation of adjacent high-speed railway subgrade is studied. This paper builds 96 finite element models for different engineering conditions using the parameters of the Modified Mohr-Coulomb model for the soil of this area. Based on the analysis and fitting of the finite element calculating results,simplified calculation formulae for the maximum horizontal displacement and the maximum settlement of HSR subgrade are worked out,which comprehensively involves three factors including the depth of excavation,the stiffness of the support system and the distance between the foundation pit and the subgrade. Prediction curves of horizontal displacement and settlement of HSR subgrade are proposed,and the corresponding prediction processes are given. The results show that according to the double logarithmic coordinates,δhmax /H (the maximum horizontal displacement of the subgrade /the excavation depth) and ρ (the stiffness of the support system) exhibit a linear relationship, so does δvmax /H (the maximum settlement of the subgrade /the excavation depth) and ρ,provided that the distance between the foundation pit and the subgrade is fixed. The horizontal displacement and the settlement of the subgrade can be calculated according to the broken line ABC in Fig. 10 and the line DEFG in Fig. 13 respectively. The proposed prediction method is effective in predicting the deformation of HSR subgrade in similar soft soil area under the influence of foundation pit excavation.关键词
基坑开挖/高铁路基/变形影响/预测方法/修正摩尔–库伦模型/有限元Key words
Foundation pit excavation/Highspeed railway subgrade/Influence on deformation/Prediction method/Modified Mohr-Coulomb model/Finite element分类
建筑与水利引用本文复制引用
方浩..基坑开挖对邻近高铁路基变形影响的预测方法研究[J].铁道标准设计,2019,63(3):26-33,8.基金项目
中铁第四勘察设计院集团有限公司科技研究开发计划项目(2013K16) （2013K16）
