何飞, 穆锐, 刘一宏.深基坑施工过程中桩锚支护结构受力数值分析[J].河南理工大学学报（自然科学版）,2021,40(1):146-154.

HE F, MU R, LIU Y H.Numerical analysis of stress of pile-anchor support structure indeep foundation pit construction[J].Journal of Henan Polytechnic University(Natural Science) ,2021,40(1):146-154.

深基坑施工过程中桩锚支护结构受力数值分析

何飞1, 穆锐2, 刘一宏3

1.贵州中建建筑科研设计院有限公司，贵州 贵阳  550006;2.陆军勤务学院 军事设施系，重庆 401311;3.中国电建集团华东勘测设计研究院有限公司，浙江 杭州  310014

摘要:为研究分阶深基坑及其桩锚支护结构在施工过程中的受力变化规律，基于实际工程案例，通过Midas GTS NX软件建立数值模型，对深基坑上阶桩、下阶桩在施工过程中支护结构的位移、内力等规律进行研究。结果表明：（1）随基坑开挖深度增大，桩体的弯矩、剪力、轴力均 先增大后减小，且上阶桩存在反弯点；（2）桩顶水平位移、沉降位移随基坑开挖深度的增大而增大，地表沉降位移呈V形分布，且距基坑边缘4 ~ 5 m受影响最大；（3 ）随基坑开挖深度增大，锚索作用时会引起内力值发生突变，且作用较大。研究结果可为类似工程桩锚支护的优化设计、施工方案提供参考依据。

关键词:深基坑;桩锚支护结构;数值模拟;分阶开挖;内力分析

doi:10.16186/j.cnki.1673-9787.2019090006

基金项目:国家自然科学基金资助项目（51608141 ）；贵州省科学技术厅社发基金资助项目（黔科合SY字［2014］3067号）

收稿日期:2019/09/02

修回日期:2020/11/21

出版日期:2021/01/15

Numerical analysis of stress of pile-anchor support structure indeep foundation pit construction

HE Fei1, MU Rui2, LIU Yihong3

1.Guizhou Zhangj~ian Architectural Research and Design Institute Co. ,Ltd. ,Guvyang  550006 ,Guizhou,China;2.Department of Military Installations,Army Logistics University of PLA ,Chongqing  401311 ,China;3.East China Survey and Design Institute Co. ,Ltd. ,China Electric Power Construction Group ,Hangzhou  310014 ,Zhejiang,China

Abstract:In order to study the law of stress change in the construction process of the layered deep foundation pit and its pile anchor supporting structure,based on actual engineering case,the numerical model was established by Midas GTS NX analysis program to analyze it,which included the displacement and internal force of the supporting structure in the construction process of the upper and lower piles of the deep foundation pit. The results showed that:(1) With the increase of excavation depth of foundation pit,the bending moment,shear force,and axial force of the pile increased firstly and then decreased,and there was a reverse bending point in the upper pile；(2)The horizontal displacement and settlement displacement of pile top increased with the increase of excavation depth of the foundation pit,and surface settlement displacement was distributed in a " V" shape,which was most affected within 4〜5 m form the edge of the foundation pit ； (3) With the increase of excavation depth of foundation pit,the internal force of cable would change suddenly,and the effect was larger. The research results could provide some references for the optimization design and construction scheme of similar engineering pile anchor support structure.

Key words:deep foundation pit;pile anchor supporting structure;numerical simulation;step excavation;internal force analysis

 深基坑施工过程中桩锚支护结构受力数值分析_何飞.pdf