带阳角土岩基坑变形特征仿真与实测对比分析  

Comparative simulation and measurement of the deformation features of the soil-rock deep foundation pit with a positive corner

作　　者：王洪德[1,2] 秦玉宾[1] 马云东[2] 张立漫[1] 

机构地区：[1]大连交通大学土木与安全工程学院,辽宁大连116028 [2]大连交通大学,辽宁省隧道与地下结构工程技术研究中心,辽宁大连116028

出　　处：《安全与环境学报》2013年第4期173-178,共6页Journal of Safety and Environment

基　　金：国家自然科学基金项目(51050003);辽宁省自然科学基金项目(201202022);大连市科技计划项目(2011E15SF118)

摘　　要：为掌握异形基坑变形特征及其对工程施工的影响,以大连市地铁二号线某车站深基坑工程为研究对象,对带阳角土岩组合深基坑变形特征进行仿真与实测对比分析。首先,构建带阳角基坑有限元分析仿真模型,其中,土体结构采用Mohr-Coulomb模型,岩体结构采用节理材料模型,锚杆、土钉与混凝土结构采用线弹性模型;然后基于实测数据对模型进行验证分析。通过该有限元分析模型平台,研究带阳角土岩组合深基坑变形特性,绘制土岩组合基坑变形与覆层土厚度关系曲线,分析土岩组合基坑阳角与阴角效应,找出不同阳角尺寸条件下覆层土体位移趋势。结果表明：地表超载25kPa时地表最大沉降量达到4~5mm;基坑阳角处最大水平位移2.5mm,最大竖向位移1.1mm,且显著大于阴角处量值。The present paper is inclined to introduce our research into the causes of the specially shaped foundation pit degeneration features and their effects on the construction process,for the purpose to provide a safe and reliable guidance to the design and construction of such pits.As a matter of fact,deep excavation engineering projects not only represent the trend of the features of maximization and profundity,but also reveal the actual need to do so,because,if not,the design would fail to meet the safe construction demand.Taking the metro station of Line Two in Dalian for example,we feel it necessary to analyze the simulation and the actual measurement results comparatively in the deformation of the soil-rock deep foundation pit with a positive corner.The reason to do such comparative studies comes from the fact that,first of all,the designers demand to set up the finite element simulation models of the deep foundation pit with positive corner,among which,the soil structure is to be modeled with Mohr-Coulomb model whereas the rock structure is modeled with a synthetic material structure.And,in contrast,the anchors,the soil nailing and the concrete structures are to be modeled with the linear elastic model.Secondly,the simulation models should be verified on the basis of the actual measurement data.The contrast and analysis results show that the actual measured value of the maximum settlement should be between 4 mm to 5 mm,the maximum vertical displacement at the foundation pit positive corner is less than 2.5 mm,and the maximum horizontal displacement here is only 1.1 mm,well with those of the calculated with the finite element method.And,finally,we have made a discussion on the deformation characteristics of the soil-rock deep foundation pit with positive corner based on the finite element simulation system,whose relative curve stands between the soil-rock foundation pit deformation and its covering soil thickness.And,last of all,we have analyzed the effects of the positive corner and the negative corner,and foun

关 键 词：安全工程 带阳角基坑 变形特征 模型仿真 阳角效应 对比分析 

分 类 号：X913.4[环境科学与工程—安全科学]