聂子奇, 张少钦. 基坑止水帷幕隔水效应分析[J]. 南昌航空大学学报(自然科学版), 2020, 34(4): 77-82. DOI: 10.3969/j.issn.2096-8566.2020.04.013
引用本文: 聂子奇, 张少钦. 基坑止水帷幕隔水效应分析[J]. 南昌航空大学学报(自然科学版), 2020, 34(4): 77-82. DOI: 10.3969/j.issn.2096-8566.2020.04.013
Zi-qi NIE, Shao-qin ZHANG. Analysis of the Effect of Waterproof Curtain on Foundation Pits[J]. Journal of nanchang hangkong university(Natural science edition), 2020, 34(4): 77-82. DOI: 10.3969/j.issn.2096-8566.2020.04.013
Citation: Zi-qi NIE, Shao-qin ZHANG. Analysis of the Effect of Waterproof Curtain on Foundation Pits[J]. Journal of nanchang hangkong university(Natural science edition), 2020, 34(4): 77-82. DOI: 10.3969/j.issn.2096-8566.2020.04.013

基坑止水帷幕隔水效应分析

Analysis of the Effect of Waterproof Curtain on Foundation Pits

  • 摘要: 对无止水帷幕、悬挂式止水帷幕及落地式止水帷幕3种基坑,采用MIDAS/GTS软件进行基坑开挖过程的应力渗流耦合模拟分析和对比,以探讨止水帷幕的隔水效应。研究表明:止水帷幕的设置能有效控制基坑降水后坑外水位下降以及降水带来的地面沉降,且帷幕越深效果越显著;降水后围护桩朝基坑方向发生偏移,偏移程度随帷幕深度增加而增大;3种基坑开挖结束后地面沉降的最大值差异不大,坑外大约半个基坑宽度范围内地面沉降取决于开挖降水共同作用,其余部分则主要由降水沉降决定;随着帷幕深度的增加,坑外降水沉降最大值减小且变化速度从快到慢,最大值发生位置逐渐靠近基坑。

     

    Abstract: Using MIDAS/GTS to create three kinds of foundation pits model: no curtain, suspended curtain and floor curtain, to simulate, analyze and compare the excavation process of foundation pit under stress-seepage coupling. The research shows that the curtain can effectively control the water level drop outside the pit and the ground settlement caused by the precipitation, and it tends to be obvious with the increase of the curtain depth. After dewatering, the retaining pile shifted towards the foundation pit, and the displacement increased with the increase of curtain depth. The maximum value of the ground settlement after the excavation of the three kinds of foundation pits differs little, The ground settlement within the width of about half of the foundation pit is determined by the excavation and dewatering, while the rest is mainly determined by dewatering. With the increase of curtain depth, the maximum value of precipitation settlement outside the pit decreases from fast to slow, and the maximum value occurs closer to the foundation pit.

     

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