深基坑桩锚支护结构变形的土体参数敏感性分析
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摘要
为研究土体参数对深基坑桩锚支护结构变形的影响,利用有限元软件建立基坑计算模型,分别针对不同弹性模量、内摩擦角、黏聚力及泊松比对支护桩水平位移的影响进行敏感性分析,研究结果表明:增大土体弹性模量、内摩擦角和黏聚力,基坑支护桩变形量会逐渐变大;增大土体泊松比,基坑支护桩变形会逐渐变小;基坑支护桩水平位移最大水平位移发生在靠近桩中位置。研究结果可为不同土体参数的深基坑桩锚支护结构工程设计提供理论参考。
In order to study the influence of soil parameters on the deformation of pile-anchor support structure for deep foundation pit, this paper built calculation model for foundation pit using finite element software,and conducted sensitivity analysis on the influence of different elastic modulus, internal friction angle, cohesion and Poisson ratio on horizontal displacement of support pile. The results showed that the deformation of support pile of foundation pit will gradually become bigger with the increase of elastic modulus of soil, internal friction angle and cohesion, while the deformation of support pile of foundation pit will gradually become smaller with the increase of Poisson ratio. The maximum horizontal displacement of support pile for foundation pit occurs in the place near to pile middle. The research results could provide theoretical reference for the engineering design of pile-anchor support structure of deep foundation pit with different soil parameters.
In order to study the influence of soil parameters on the deformation of pile-anchor support structure for deep foundation pit, this paper built calculation model for foundation pit using finite element software,and conducted sensitivity analysis on the influence of different elastic modulus, internal friction angle, cohesion and Poisson ratio on horizontal displacement of support pile. The results showed that the deformation of support pile of foundation pit will gradually become bigger with the increase of elastic modulus of soil, internal friction angle and cohesion, while the deformation of support pile of foundation pit will gradually become smaller with the increase of Poisson ratio. The maximum horizontal displacement of support pile for foundation pit occurs in the place near to pile middle. The research results could provide theoretical reference for the engineering design of pile-anchor support structure of deep foundation pit with different soil parameters.
引文
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[2]李益斌,董维,王兵.软土地区深基坑监测及变形特性分析[J].测绘通报,2017(S2):116-120,130.
[3] Cui Xiaoyan,Ye Mingge, Zhuang Yan. Performance of a foundation pit supported by bored piles and steel struts:A case study[J]. Soils and Foundations,2018, 58(4):1016-1027.
[4] Hua Peng,Xiao Qi Xiao,Zhi Yong Dong. Study on Deformation Influence of Deep Foundation Pit Pile-Anchor Supporting System Nearby Metro Structure[J]. Applied Mechanics and Materials,2014,638:3489.
[5]韩健勇,赵文,贾鹏蛟,等.桩锚支护结构深基坑受力变形及稳定性分析[J].地下空间与工程学报,2017,13(S2):907-914.
[6]李金华,宋涛,朱海西,等.南宁地铁2号线车站深基坑开挖变形规律研究[J].施工技术,2017,46(19):32-35.
[7]陈树林,张峰,代楠.紧邻既有结构的深基坑受力变形特性分析[J].上海交通大学学报,2016,50(10):1658-1664.
[8]曾婕,龚迪快,成怡冲,等.软土地区深基坑变形控制措施对减小临近隧道变形的效果分析[J].工程勘察,2018,46(5):14-21.