河北工业科技2026，Vol.43Issue(3)：244-253,10.DOI:10.7535/hbgykj.2026yx03006
深基坑桩锚联合支护体系力学机理与效果评估
Mechanical mechanism and effect evaluation of deep foundation pit pile-anchor combined support system
摘要
Abstract
To reveal the deformation and mechanical response laws of pile-anchor composite support structures during the excavation of complex deep foundation pits and enrich the theoretical system of composite support for deep foundation pits,taking a large-scale reconstruction and expansion deep foundation pit support project in China as the engineering background,PLAXIS 3D finite element software was adopted to quantitatively analyze the internal force and displacement of cast-in-place piles,and the surface deformation during the layered construction of anchor cables.An improved calculation method for the stability of support structures considering the distribution effect of anchor cable pretension was proposed and compared with the strength reduction method.The optimal design of anchor cable prestress was realized by regression analysis.The results show that during the layered construction of multi-layer anchor cables,the horizontal displacement of the ground surface presents a trend of"steep drop followed by gentle leveling",and the displacement and internal force of cast-in-place piles are mainly concentrated in the upper half of the pile body.After the construction of five rows of anchor cables is completed,the maximum safety coefficient calculated by the improved stability formula considering the pretension distribution is 1.88,while the stability formula of the strength reduction method is 1.94.Comparing the two,the calculation error of the improved formular is only about 3.1％,and a higher safety margin is retained.The bending moment variation curves of anchor cables under different prestress values conform to the Gauss distribution function.The optimal prestress of multi-layer anchor cables is 423 kN with the minimum bending moment as the control index,and the maximum horizontal displacement of the ground surface is reduced 86.2％after optimization.The research results can provide effective reference for the optimization of anchor cable prestress parameters in deep foundation pit engineering supported by pile-anchor composite structures.关键词
地基基础工程/桩锚联合支护/数值模拟/强度折减/预应力优化Key words
foundation engineering/pile-anchor combined support/numerical simulation/strength reduction/prestress opti-mization分类
建筑与水利引用本文复制引用
周建建,宋德威,葛斐,吴健,李进晓,孙阳,薛永利..深基坑桩锚联合支护体系力学机理与效果评估[J].河北工业科技,2026,43(3):244-253,10.基金项目
国家重点研发计划项目(2023YFC3206103) （2023YFC3206103）
国家电力投资集团公司B类课题(23FW2035) （23FW2035）
