复合土钉墙支护设计参数敏感性分析及边坡变形规律研究

›› 2011, Vol. 32 ›› Issue (S2): 393-400.

复合土钉墙支护设计参数敏感性分析及边坡变形规律研究

徐帮树，刘日成，李连祥，公铭，王育奎

山东大学土建与水利学院城市地下空间工程系，济南 250061

收稿日期:2011-03-30 出版日期:2011-08-10 发布日期:2011-08-26
作者简介:徐帮树，男，1974年生，博士，副教授，主要从事岩土工程数值计算、GIS三维分析方面的教学与研究工作
基金资助:
国家自然科学基金资助项目（No. 50539080；No. 50574053；No. 50779073）

Study of slope deformation and parameters sensitivity in supporting design of composite soil nailing wall

XU Bang-shu, LIU Ri-cheng, LI Lian-xiang, GONG Ming, WANG Yu-kui

Department of Underground Space, School of Civil and Hydraulic Engineering, Shandong University, Jinan 250061, China

Received:2011-03-30 Online:2011-08-10 Published:2011-08-26

摘要/Abstract

摘要： 由土钉和预应力锚索组成的复合土钉墙支护结构可以有效加固周围土体，控制基坑变形，被广泛应用于基坑支护设计中。以济南西客站站前广场基坑工程复合土钉墙支护设计为例，通过FLAC3D有限差分软件数值计算和现场监测分析，采用弹塑性实体单元和线性锚杆单元，考虑锚杆与土体相互作用，通过对土钉和预应力锚索组成的复合土钉支护结构进行开挖支护施工全过程的三维动态模拟分析。分析基坑坡面水平位移、坑底隆起、地表沉降、土钉轴力、预应力锚索轴力等变化规律，研究复合土钉墙的受力机制，探讨土钉和预应力锚索的共同作用机制。分析土体各种力学参数和锚杆间距、锚索预应力等设计参数对基坑变形影响的敏感性，并与监测数据进行对比分析。研究表明，锚杆与土体相互作用力学模型能较好模拟复合土钉墙支护施工过程，计算精度较高；土体黏聚力、摩擦角、土钉间距、锚索预应力等对基坑边坡变形的影响较大，计算结果可为复合土钉墙设计参数选取提供参考

关键词: 复合土钉墙, 土钉耦合模型, FLAC3D, 基坑变形, 敏感性分析

Abstract: Composite soil nailing wall (CSNW) composed of soil nails and prestressed anchor cable can reinforce surrounding soils effectively and control deformation of the foundation pit. Also, it is used in the supporting design of foundation pit widely. Based on the foundation pit of Jinan’s West Railway Station, the fast Lagrangian analysis of continua in 3 dimensions (FLAC3D) is used to do numerical simulation of the CSNW, and do detail comparison with field monitoring. Elastoplastic entity unit and linear anchor unit are applied and the interaction between soil and anchor cable is considered in the numerical simulation. 3D simulation analysis of foundation pit has been done during the whole process of excavation, supporting and construction. Force mechanism of CSNW and effects of soil nails and prestressed anchor cable are analyzed in the aspects of horizontal strain of slope, vertical strain of bottom, ground settlement, axial force of soil nails and prestressed anchor cable. Mechanical parameters and design parameters are analyzed according to their impact on the strain of the foundation pit. And the results are analyzed and compared with the field monitoring data. The results show that the model considering interaction between soil and anchor cable can simulate the whole process of CSNW very well, and can get a very high computational accuracy. The parameters including soil cohesion, soil friction, soil nail spacing and prestress have great influence on slope deformation. And the results can provide reference to the choosing of design parameters of CSNW.

Key words: composite soil nailing wall, coupling interaction of soil and nail, FLAC3D, deformation of foundation pit, sensitivity analysis

中图分类号:

TU 411

徐帮树，刘日成，李连祥，公铭，王育奎. 复合土钉墙支护设计参数敏感性分析及边坡变形规律研究[J]. , 2011, 32(S2): 393-400.

XU Bang-shu, LIU Ri-cheng, LI Lian-xiang, GONG Ming, WANG Yu-kui. Study of slope deformation and parameters sensitivity in supporting design of composite soil nailing wall[J]. , 2011, 32(S2): 393-400.

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