三峡大学学报（自然科学版）2025，Vol.47Issue(2)：1-11,11.DOI:10.13393/j.cnki.issn.1672-948X.2025.02.001
塑性混凝土防渗墙成槽与基坑开挖数值分析
Numerical Analysis of Trenching Construction for Plastic Concrete Cutoff Wall and Foundation Excavation
摘要
Abstract
In this study,the Shigu water source cutoff wall in the Lijiang section of the Central Yunnan Water Diversion Project is set as the research background.By the engineering classification method,the mix proportions of plastic concrete were determined.Through laboratory tests including uniaxial compression tests,Brazilian splitting tests,three-point bending tests,and variable angle shear tests,the physical and mechanical parameters of plastic concrete were obtained.Based on these parameters,numerical models corresponding to the actual project were established using FLAC3 D to simulate the construction of the cutoff wall and the excavation process of the pit,and to investigate the impact of construction on the deformation of the trench wall and the failure of soil masses.The results indicate that the construction of the cutoff wall causes deformation of the trench wall and the formation of plastic zones,with an increase in the length of the cutoff wall trench segment leading to significant increases in trench wall deformation and the expansion of soil failure areas.During the pit excavation process,the net distance between the cutoff wall and the pit significantly affects the deformation during excavation,with the maximum displacement showing a pattern of first decreasing and then increasing as the net distance increases.Therefore,the rational layout of the cutoff wall is necessary.This study provides a basis and guidance for optimizing construction techniques for plastic concrete cutoff walls and ensuring the safety of pit excavation.关键词
塑性混凝土/防渗墙/槽壁稳定性/基坑工程Key words
plastic concrete/cutoff wall/wall stability/foundation pit engineering分类
水利科学引用本文复制引用
刘振国,王蓥森,郑长洲..塑性混凝土防渗墙成槽与基坑开挖数值分析[J].三峡大学学报（自然科学版）,2025,47(2):1-11,11.基金项目
国家自然科学基金项目(51979272) （51979272）
