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梁    晟¹ , 王曉磊¹ , 張建英² , 于庭富² , 張澤浩¹

( 1. 河北工程大學 土木工程學院 ，河北 邯鄲 056038 ;

2. 中國二十二冶集團有限公司 路橋工程分公司 ，河北 唐山 064000)

摘   要： 以河北省邯鄲市某富水地層拉森鋼板樁＋高壓旋噴樁止水帷幕設(shè)計的管廊深基坑工程為依托，利用Midas-GTS 軟件對基坑降水開挖進行了全過程的數(shù)值模擬，研究了止水帷幕對支護結(jié)構(gòu)變形和受力的影響 。在驗證模型準確的基礎(chǔ)上，分別分析了止水帷幕與支護樁不同間距和止水帷幕不同排數(shù)對支護樁的影響 。結(jié)果表明 ，旋噴樁止水帷幕能夠延長地下水的滲流路徑 ，減緩滲流速度 ，分擔部分樁后土壓力 ，對抑制支護樁變形和 彎矩的產(chǎn)生有積極作用； 旋噴樁止水帷幕與支護樁不同的間距增加了整體抗彎剛度 ，可以有效地限制支護樁變 形和彎  矩的產(chǎn)生，間距建議保持在 1 ~ 3 m 適宜，超過5 m 后抑制作用不明顯； 旋噴樁止水帷幕的排數(shù)越多支護效果越明顯，相關(guān)結(jié)果對富水地層基坑工程的優(yōu)化有一定的參考意義。

關(guān)鍵詞： 數(shù)值模擬； 深基坑開挖； 富水地層； 止水帷幕

中圖分類號： TU94+2      

文獻標志碼： A      

文章編號： 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

?基金項目： 河北省建設(shè)科技項目  (2022-2013) 。

作者簡介： 梁晟  (1997—) , 男 ，碩士研究生 ，主要研究方向： 巖土工程。 收稿日期： 2022-07-19