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梁    晟¹ , 王晓磊¹ , 张建英² , 于庭富² , 张泽浩¹

( 1. 河北工程大学 土木工程学院 ，河北 邯郸 056038 ;

2. 中国二十二冶集团有限公司 路桥工程分公司 ，河北 唐山 064000)

摘   要： 以河北省邯郸市某富水地层拉森钢板桩＋高压旋喷桩止水帷幕设计的管廊深基坑工程为依托，利用Midas-GTS 软件对基坑降水开挖进行了全过程的数值模拟，研究了止水帷幕对支护结构变形和受力的影响 。在验证模型准确的基础上，分别分析了止水帷幕与支护桩不同间距和止水帷幕不同排数对支护桩的影响 。结果表明 ，旋喷桩止水帷幕能够延长地下水的渗流路径 ，减缓渗流速度 ，分担部分桩后土压力 ，对抑制支护桩变形和 弯矩的产生有积极作用； 旋喷桩止水帷幕与支护桩不同的间距增加了整体抗弯刚度 ，可以有效地限制支护桩变 形和弯  矩的产生，间距建议保持在 1 ~ 3 m 适宜，超过5 m 后抑制作用不明显； 旋喷桩止水帷幕的排数越多支护效果越明显，相关结果对富水地层基坑工程的优化有一定的参考意义。

关键词： 数值模拟； 深基坑开挖； 富水地层； 止水帷幕

中图分类号： TU94+2      

文献标志码： A      

文章编号： 1005-8249 (2024) 01-0119-07

DOI : 10. 19860/j.cnki.issn1005-8249.2024.01.021

 

LIANG Sheng¹ , WANG Xiaolei¹ , ZHANG Jianying² , YU Tingfu² , ZHANG Zehao¹

( 1. College of Civil Engineering , Hebei University of Engineering , Handan 056038 , China ;

2. Road and Bridge Engineering Branch of China 22 Metallurgy Group Co. ，Ltd. ，Tangshan 064000 , China)

Abstract: Based on the deep foundation pit project of pipe gallery designed by the waterproof curtain of Larsen steel sheet pile +high pressure jet grouting pile in a water-rich stratumd in Handan City, Hebei Province, the whole process of dewatering  excavation of foundation pit was numerically simulated by Midas-GTS software, and the influence of waterproof curtain on the deformation and stress of supporting structure was studied. On the basis of verifying the accuracy of the model, the influences of different spacings between waterproof curtain and supporting pile and different rows of waterproof curtain on supporting pile are analyzed respectively. The results show that the waterproof curtain can not only prolong the seepage path and slow down the seepage velocity,but also share some soil pressure ,which has a positive effect on inhibiting the deformation and bending moment of the supporting pile. The different spacing between the rotary jet grouting pile and the supporting pile increases the bending stiffness, which can effectively limit the deformation and bending moment of the supporting pile. It is suggested that the spacing should be maintained at 1 ~ 3 m, but the inhibitory effect is not obvious after exceeding 5 m. The more rows of rotaryjet grouting pile waterproof curtain, the more obvious the supporting effect is. The relevant results have certain reference significance for the optimization of foundation pit engineering in water-rich strata.

Keywords : numerical simulation; deep foundation pit excavation; water-rich strata; water-stopping curtain

∗基金项目： 河北省建设科技项目  (2022-2013) 。

作者简介： 梁晟  (1997—) , 男 ，硕士研究生 ，主要研究方向： 岩土工程。 收稿日期： 2022-07-19