摘要
由于内支撑围护结构系统刚度在空间上的差异性,基坑的变形问题表现出三维特性。为了更好的对围护结构变形及周围土体沉降的空间特性进行研究,采用Plaxis 3D有限元模拟对空间效应主要影响参数进行分析。分析结果表明:开挖尺寸对围护结构的变形特性及空间效应有一定的影响。围护结构所处的深度对平面应变比(PSR)有一定的影响,越是靠近地表处,围护结构长边的平面应变比越容易达到稳定状态。地表沉降受其与围护结构的相对位置影响较大,在距离围护结构0.75H_e时,土体沉降较大且表现的空间效应最明显。
The deformations of retaining wall and soil show the three-dimensional(3 D)effects because of the difference of system stiffness corresponding to different positions. In order to analyse the deformation characteristics of the retaining wall and the soil, a series of finite element modeling were established to study the main influencing factors. Research results indicate that excavation size have a influence on the deformation characteristics of the retaining wall and soil. Plain strain ratio(PSR) have a relationship with the depth of retaining wall. The plain strain ratio is easy to reach a steady state near the surface. The surface settlement are greatly influenced by its relative position with retaining structure. Meanwhile, The surface settlement have the best obvious three-dimensional(3 D)effects with the relative distance of 0.75H_e(H_e is the excavation depth).
作者
刘念武
俞济涛
龚晓南
朱祖华
杨云芳
Liu Nianwu;Yu Jitao;Gong Xiaonan;Zhu Zuhua;Yang Yunfang(China Railway Eryuan Engineering Group CO.LTD,Chengdu 610031,China;Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 310018,China)
出处
《科技通报》
2019年第2期166-172,共7页
Bulletin of Science and Technology
基金
浙江省公益技术研究社会发展项目(2016C33020)
浙江省公益技术应用研究资助项目(2015C33017)
国家自然科学基金项目(51608485)
关键词
基坑工程
支撑
三维效应
侧向位移
土体沉降
excavation
struts
three-dimensional effects
lateral displacement
soil settlement
