基于正交数值试验的SMW工法桩参数反分析优化  

Inverse Analysis and Optimization of SMW Pile Parameters Based on Orthogonal Numerical Test

作　　者：鞠海燕[1] 刘星星 周杨 万灵 刘艳 JU Haiyan;LIU Xingxing;ZHOU Yang;WAN Ling;LIU Yan(School of Civil and Architectural Engineering,Nanchang Institute of Engineering,Nanchang 330029;Jiangxi Tianchi High-Speed Technology Development Co.,Ltd.,Nanchang 330000;Jiangxi Academy of Transportation Sciences,Nanchang 330200;School of Architectural Engineering,Zhejiang University,Hangzhou 310058)

机构地区：[1]南昌工程学院土木与建筑工程学院,南昌330099 [2]江西省天驰高速科技发展有限公司,南昌330000 [3]江西省交通科学研究院,南昌330200 [4]浙江大学建筑工程学院,杭州310058

出　　处：《现代隧道技术》2022年第5期136-143,共8页Modern Tunnelling Technology

基　　金：国家自然基金面上项目(51978431);江西省交通厅科技项目(2020Z003,2021H0007);江西省教育厅科学技术研究项目(GJJ211907).

摘　　要：采用有限元软件建立分析模型,研究基坑开挖对邻近隧道水平变形的影响,分析SMW工法桩桩体插入比、内插型钢间距、内插型钢型号、水泥土桩径、钢支撑预加轴力5种因素对邻近隧道变形的影响规律,结合正交试验将影响程度可视化,并采用回归法反分析优化SMW工法桩设计参数。研究结果表明:改变SMW围护结构内插型钢型号对邻近隧道变形影响很小,桩体插入比在超过2.0后,围护桩插入深度的增加对隧道水平位移影响较小;水泥土桩径对邻近隧道水平变形的影响最大,钢支撑预加轴力次之,桩体内插型钢间距的影响也应当予以重视,桩体插入比在1.0~2.5之间时可视为影响邻近隧道水平变形的非主要因素;在正交试验基础上采用回归法拟合回归方程反分析计算最优参数组合是可行的,且得出的参数组合较正交试验的更为优越。The finite element analysis is used to establish a model to study the influence of foundation pit excavation on the horizontal deformation of adjacent tunnels.The influence of five factors on the deformation of adjacent tunnels is analyzed,including the insertion ratio of the SMW pile,the spacing of inserted steel,the type of inserted steel,the diameter of the cement-soil pile,and the pre-axial force of steel support.The orthogonal test visualizes the influence degree,and the design parameters of the SMW pile are optimized by the regression method.The results show that the change in the type of SMW retaining structure has little effect on the deformation of the adjacent tunnel.When the pile insertion ratio exceeds 2.0,the increase of the insertion depth of the retaining pile has little effect on the horizontal displacement of the tunnel.The diameter of the cement-soil pile has the most significant influence on the horizontal deformation of the adjacent tunnel,followed by the pre-axial force of the steel support.The influence of the spacing of the inserted steel in a pile should also be paid attention to.When the pile insertion ratio is between 1.0 and 2.5,it can be regarded as a non-major factor affecting the horizontal deformation of the adjacent tunnel;based on the orthogonal test,it is feasible to use the regression method to fit the regression equation to calculate the optimal parameter combination,and the obtained parameter combination is superior to the orthogonal test.

关 键 词：基坑开挖 近接 正交数值试验 回归法反分析 SMW工法桩参数优化 

分 类 号：U231.3[交通运输工程—道路与铁道工程] U455.43[建筑科学—桥梁与隧道工程]