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焦春茂,汪华安,陈晓.基坑开挖变形稳定颗粒流数值模拟研究[J].河北工程大学自然版,2019,36(2):28-32
基坑开挖变形稳定颗粒流数值模拟研究
Numerical simulation of deformation and stability in foundation pit excavation with particle ?ow code
投稿时间:2018-11-07  
DOI:10.3969/j.issn.1673-9469.2019.02.007
中文关键词:  基坑  颗粒流  沉降变形  坑壁稳定
英文关键词:foundation pit  grain flow  subsidence deformation  stability of pit wall
基金项目:国家自然科学基金资助项目(51679071)
作者单位
焦春茂 中国能源建设集团 广东省电力设计研究院有限公司, 广州 510663 
汪华安 中国能源建设集团 广东省电力设计研究院有限公司, 广州 510663 
陈晓 河海大学 岩土工程科学研究所, 南京 210094 
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中文摘要:
      为了分析基坑开挖对周围环境的影响,基于颗粒流数值模拟方法,利用边界伺服法构建理想颗粒体系,利用线性接触黏结模型标定岩土体的细观力学参数。结果表明:基坑开挖后距离基坑壁60~70 m地表变形约5 mm;60~70 m远处的管道相对变形量不超过3 mm,不会引起管线不均匀沉降而破坏;桩墙失效基坑周围的素填土以及淤泥质黏土将会向基坑滑塌,其滑塌范围从基坑内壁向外约影响10 m,约为基坑开挖深度的2~3倍范围。研究结果可为基坑壁的稳定性判定与周围土体的变形控制提供参考。
英文摘要:
      In order to analyze the influence of foudation pit excavation on surrounding environment Based on the numerical simulation method of particle flow, the ideal particle system is constructed by boundary servo method, and the micro-mechanical parameters of rock and soil are calibrated by linear contact bond model. On this basis, the influence of foundation pit excavation on surrounding environment is analyzed. The results show that the ground deformation of 60-70m away from the foundation pit wall is about 5mm after excavation, the relative deformation of pipeline at 60-70m away from the foundation pit wall is less than 3mm, which will not cause uneven settlement of pipeline and damage; the plain filling and muddy clay around the failure foundation pit of pile wall will slide to the foundation pit, and the collapse range affects 10m approximately from the inner wall of the foundation pit, which is about 2~3 times the depth of the foundation pit. The research results can provide reference for the judgment of the stability of foundation pit wall and the deformation control of surrounding soil.
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