广州软土地区基坑边坡支护效果研究

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中图分类号：TU753 文献标志码：A 文章编号：1003-5168（2025）18-0077-05

DOI：10.19968/j.cnki.hnkj.1003-5168.2025.18.013

Research on the Effect of Foundation Pit Slope Support in Soft Soil Area in Guangzhou City

HUANG Jinlong WANGYi LIXiaohu ZHANG Yun XIAN Tianlang （Guangzhou Design Institute Group Co.，Ltd.，Guangzhou 51O620，China）

Abstract： [Purposes] Aiming at the deformation controlchallenges of deep foundation pits insoft soil in thePearl River Delta，this study takes the foundation pit in Guanglong Village，Nansha，Guangzhou as an example to investigate the deformation behavior of weak strata during excavation and explore optimized support methods for deep excavations in the region.[Methods]A finite element model of the geological conditions was established using the FEM，incorporating the HS-smallconstitutive model to simulate the nonlinear characteristics of the soil.A composite support system of“bored piles + anchor cables + mixing piles” was designed，and a multi-parameter stability evaluation was carried out using the Swedish slice method.[Findings]The results indicate that during the first excavation stage，the maximum horizontal displacement at the pit bottom was 9.OO mm，with a maximum heave of 20.OO mm in the central area. Soil nailing limited the setlement at the slope crest toonly1.OO mm.In the second stage，the displacement of the pilesshowed a gradient distribution（11.OO mmat the pile bottom >1.00 mmat thepile top）， thebase heave decreased to 18.75 mm，and the surrounding settlement was 3.75 mm.The safety factor for the most critical slip circle with a radius of 26m was1.787， exceeding the code-specified limit by （204号 37% . [Conclusions] The numerical simulation and stability analysis demonstrate that the proposed support scheme can effctively control the deformation of the soft soil foundation pit and meet the stability requirements during both construction and operation. It provides a design reference for similar projects. Keywords： foundation pit; soft soil area; numerical simulation; Swedish slice method; foundation pit support

0 引言

随着粤港澳大湾区城市化进程的加速推进，复杂环境条件下的深基坑工程正面临日益严峻的技术挑战。（剩余4946字）