巨厚软土地区深基坑应力与变形研究  

Study on Deep Foundation Pit Stress and Deformation in the Area with Super-thick Soft Soil

作　　者：张跃 颜庭成[1,2] Zhang Yue;Yan Tingcheng(East China Mineral Exploration and Development Bureau of Jianqsu Province,Nanjing 210007,China;Zhenjiang No.814 Surveying and Mapping Co.,Ltd.,Zhenjiang 212005,China)

机构地区：[1]江苏省有色金属华东地质勘查局,江苏南京210007 [2]镇江八一四勘察测绘有限公司,江苏镇江212005

出　　处：《甘肃科学学报》2018年第2期93-97,共5页Journal of Gansu Sciences

摘　　要：由于土体性质的复杂性,理论分析很难预测巨厚软土地区深基坑的应力和变形特征,而数值模拟是一个很好的解决方法。结合长江三角洲海相巨厚软土地区某地铁站深基坑工程地质条件,采用弹塑性有限元方法,对地下连续墙支护结构的深基坑在不同开挖时序的地表变形、支撑受力和基坑回弹特征进行了分析。数值模拟结果表明,巨厚软土地区深基坑开挖引起的地表沉降影响范围大约为基坑开挖深度的4倍;周边地表水平位移的影响范围大约为开挖深度的6倍;开挖过程中支撑受力从上至下有逐渐增大的趋势。这可为后续安全施工、科学设置监测点位置以保证深基坑本身和周边建(构)筑物安全提供基础资料,也可为类似巨厚软土地区深基坑的设计、施工提供借鉴。In consideration of the soil property complexity,it is difficult to forecast the stress and deformation characteristics of deep foundation pit in the area with super-thick soft soil in theory,but,the numerical simulation is recognized as a good solution.Given this,the author will take the elastic-plastic finite element method to analyze the surface deformation,supporting stress and foundation pit springback characteristics of the deep foundation pit which adopts the underground continuous wall supporting structure in different excavation sequences according to the engineering geological conditions of deep foundation pit in one subway station in the area with super-thick soft soil in Yangtze River Delta.According to the numerical simulation results,the surface subsidence caused by deep foundation pit excavation in the area with super-thick soft soil is 4 times of excavation depth of foundation pit;Meanwhile,the influence scope of horizontal displacement on the surrounding earth surface is approximately 6 times of excavation depth;The supporting stress is increased gradually from top to bottom during excavation.Thus,it will provide the basic materials for the follow-up safety construction,scientific monitoring station location,as well as the safety of the deep foundation pit and surrounding buildings(structures),in addition,which can also offer reference to the design and construction of deep foundation pit in the area with the similar super-thick soft soil.

关 键 词：巨厚软土 深基坑 弹塑性有限元 应力 变形 

分 类 号：TU473.1[建筑科学—结构工程]