整体分析法在基坑变形与力学特性研究中的应用

李恭晨

doi:10.13568/j.cnki.651094.651316.2020.03.21.0001

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整体分析法在基坑变形与力学特性研究中的应用

工程技术 | 更新时间：2026-01-21

- 整体分析法在基坑变形与力学特性研究中的应用
- 整体分析法在基坑变形与力学特性研究中的应用
- 新疆大学学报（自然科学版中英文） 2021年38卷第3期页码：377-384
- 作者机构：
  
  中国地质大学(北京)水资源与环境学院
- 作者简介：
- 基金信息：
  
  大学生科技创新基金项目（201510405022）
- DOI：10.13568/j.cnki.651094.651316.2020.03.21.0001
  中图分类号： TU433
- 纸质出版：2021
- 稿件说明：
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[1]李恭晨.整体分析法在基坑变形与力学特性研究中的应用[J].新疆大学学报(自然科学版)(中英文),2021,38(03):377-384.
[1]李恭晨.整体分析法在基坑变形与力学特性研究中的应用[J].新疆大学学报(自然科学版)(中英文),2021,38(03):377-384. DOI： 10.13568/j.cnki.651094.651316.2020.03.21.0001.

DOI：10.13568/j.cnki.651094.651316.2020.03.21.0001.

摘要

为了研究整体分析法在基坑变形与受力中的应用

本文选取北京市某一采用复合土钉墙的基坑作为研究对象

运用FLAC 3D有限差分软件对该工程进行数值模拟

并结合现场实测数据进行分析

得到了该基坑侧壁侧向位移、土钉(锚索)轴力以及水泥土搅拌桩弯矩

并用现场实测数据验证了数值模型的可靠性.通过改变数值模型中水泥土搅拌桩这一影响因素

分析该基坑的侧壁变形、土钉(锚索)轴力的变化以及两者协同变化对基坑稳定性的影响.结果表明:基坑侧壁水平位移呈"弓"字形

两凸点位于基坑深度的1/3与2/3处、水平位移在1/3深度处最大;基坑水平位移随开挖深度的增加而增加

增长最大幅度是在第一步开挖时;土钉(锚索)轴力沿长度呈两头轴力小

距离临空面1/3长度处轴力最大

土钉从第1排到第5排轴力依次减小;水泥土搅拌桩不仅有挡水作用

还对基坑土体变形增长有一定的抑制作用;支护体系某一因素发生改变时

其不仅仅影响的是土体的变形

还有支护体系受力变化

两者共同作用来维持基坑的稳定性

所以分析时应将基坑土体与支护体系作为一个整体来考虑基坑的受力与变形.

Abstract

(Purpose)In order to study the overall analysis on the application of deformation and stress

this article selects a with composite soil nailing wall of foundation pit in Beijing as the research object

(Method)using the finite difference software Flac 3d numerical simulation for the project

obtained the lateral displacement of the foundation pit wall

soil nail(anchor) axial force and cement-soil mixing pile bending moment

and verify the reliability of the numerical model to the actual measured data.By changing the influence factor of soil-cement mixing pile in the numerical model

this paper analyzes the lateral wall deformation

the change of axial force of soil nails(anchor cables) and the contribution of the two changes to the stability of the foundation pit.(Result)The results show that the horizontal displacement of the side wall of the foundation pit is shaped like a "bow"

the two convex points are located at 1/3 and 2/3 of the depth of the foundation pit

and the horizontal displacement is the largest at 1/3 of the depth.The horizontal displacement of foundation pit increases with the increase of excavation depth.The axial force of soil nails(anchor cables) is small at both ends along the length

and the axial force is the largest at 1/3 of the length away from the air surface. The axial force of soil nails decreases successively from row 1 to row 5.Soil-cement mixing not only holds back water

but also inhibits the deformation of foundation pit.When a certain factor of the support system changes

it will not only affect the soil deformation

but also the stress change of the support system

both of which change together to maintain the stability of the foundation pit. Therefore

the soil and the support system of the foundation pit should be taken as a whole to analyze the stress and deformation of the foundation pit.

关键词

Keywords

references

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