土岩二元地区深基坑桩锚支护结构变形分析.docx

*土岩二元地区深基坑桩锚支护结构变形分析伊晓东1 ，黄鹏1 ，王智超2( 1．大连理工大学建设工程学部空间信息研究所，辽宁 大连116024;2． 解放军 65015 部队，辽宁 大连116023)摘 要: 土岩结合条件下深基坑支护问题是大连地区面临的典型支护问题。桩锚支护结构作为典型基坑支护形式，使其在坑内预留平台的二元结构深基坑中如何有效发挥作用、既经 济又安全，是近年来人们不断探索的课题。本文结合本地区一实际工程，运用有限元软件 ABAQUS 基坑开挖全过程进行非线性分析，结果表明: 二元结构分界处是引起支护结构“急 剧”变形的关键位置。通过与监测数据对比，表明该数值模型的可靠性，得到了相关的基坑变 形规律，为类似土岩结合地区深基坑支护设计、施工及监测提供借鉴。关键词: 二元结构; ABAQUS; 数值模拟; 变形监测中图分类号: TU470 + ． 3 文献标识码: A文章编号: 1673-0836( 2013) 增 1-1549-05The Deformation Analysis of Pile-anchor Supporting System of Deep FoundationPit in Soil-rock Dualistic AreaYi Xiaodong1 ，Huang Peng1 ，Wang Zhichao2( 1． Laboratory of Surveying and Spatial Information Technology，School of Civil Engineering，Dalian University of Technology，Dalian，Liaoning 116024，China; 2． 65015 Troops，Dalian，Liaoning 116023，China)Abstract: Deep foundation pit supporting in soil-rock areas occurred commonly in Dalian Ｒegion． In the dual structure deep foundation pit in which the platform is reserved and the pile-anchor support is as a typical form of foundation pit support，how to play its role effectively and make the design economical and safe is the subject explored continuously in recent years． Through a practical engineering case，this paper used finite element software ABAQUS to simulate the whole process of pit excavation． Simulation results show that the boundary of the dual structure is the key position that caused the “sharp deformation”of the supporting structure． Compared with monitoring data，the results indicate that the reliability of the numerical model and the relevant deformation laws are verified，which can be used as the reference for the design，construction and monitoring of the deep foundation pit support in the similar location．Keywords: dual structure; ABAQUS; numerical simulation; deformation monitoring对深基坑工程理论研究、设计与施工均提出了诸多挑战性问题［1］。目前，对于纯土体的一元结构基坑相关理论与 经验已较成熟，但对于上层土体、下层岩体的特殊 二元结构地区有较难的适用性。土岩结合地区深1引言近年来，随着经济建设的高速发展，高层建筑越来越多，基坑开挖的深度与规模也不断增大。由 于功能要求日益复杂、支护体系繁多，其复杂程度* 收稿日期: 2013-09-13( 修改稿)作者简介: 伊