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李    龍 ¹   ,  唐金召²  ,  左文州¹   ,  李長(zhǎng)印¹   ,  李景豐¹

( 1 .  中國(guó)水利水電第十一工程局有限公司 ，河南 三門(mén)峽 450001 ;

2. 河南理工大學(xué)土木工程學(xué)院 ，河南 焦作 450003)

摘   要 ：為研究不同止水帷幕深度下深基坑降水井出水流量的變化規(guī)律， 以鄭州地鐵某車(chē)站深基坑降水為背景，利用有限元MIDAS GTS 對(duì)不同止水帷幕深度下各種降水工況進(jìn)行模擬，并重點(diǎn)分析降水井出水流量的變化規(guī)律 。研究表明，止水帷幕插入潛水層的深度與降水井出水流量呈負(fù)相關(guān)， 即降水井出水流量隨著止水帷幕插入潛水層深度的增大逐漸減小，且貫穿止水帷幕后趨于穩(wěn)定；當(dāng)止水帷幕插入比介于 0. 44 ~ 0. 625 時(shí)，降水井 出水流量的變化幅度隨止水帷幕插入深度的增加逐漸減小；當(dāng)止水帷幕插入比在 0. 625 ~ 0. 875 之間時(shí)，降水井出水流量近似線性的減?。划?dāng)止水帷幕插入比大于 0. 875 時(shí)， 降水井出水流量降低的效果與完全隔斷含水層的效果相近 。綜合考慮止水帷幕深度對(duì)降水井出水流量的影響及工程造價(jià)，止水帷幕插入比深度宜介于 0. 875 ~ 1 之間 。該研究成果可為鄭州地鐵車(chē)站深基坑止水帷幕優(yōu)化提供理論指導(dǎo)。

關(guān)鍵詞 ：降水井 ；止水帷幕 ；插入比 ；MIDAS GTS

中圖分類(lèi)號(hào) ：TU46+ 3           

文獻(xiàn)標(biāo)志碼 ：A    

文章編號(hào) ：1005- 8249  (2023)   05- 0013- 07

DOI : 10. 19860/j . cnki . issn1005- 8249. 2023 . 05 . 003

LI Long¹  ,  TANG Jinzhao² ,   ZUO Wenzhou ¹  ,   LI Changyin ¹  ,   LI Jingfeng¹

( 1 . Sinohydro Bureau 11Co. ，Ltd. ，Sanmenxia 450001 ,   China;

2. School of Civil Engineering ,   Henan Polytechnic University ,  Jiaozuo 454003 ,   China)

Abstract：In order to study the variation law of the outflow of the deep foundation pit dewatering well under different waterproof wall depths, based on the deep foundation pit precipitation of a station in Zhengzhou subway, the finite element MIDAS GTS is used to simulate various precipitation conditions under different waterproof curtain depths, and the variation law of water flow in precipitation wells is emphatically analyzed. Study proves that, the depth of the waterproof wall inserted into the phreatic layer is negatively correlated with the outflow of the dewatering well, that is, the outflow of the dewatering well decreases with the increase of the depth of the waterproof curtain inserted into the phreatic layer, and tends to be stable after the waterproof wall is penetrated; when the insertion ratio of the waterproof wall is between 0.44 and 0.625, the variation range of the outflow of the dewatering well decreases with the increase of the insertion depth of the waterproof wall; when the insertion ratio of waterproof wall is between 0.625 and 0.875, the outflow of dewatering well decreases approximately linearly; when the insertion ratio of waterproof wall is greater than 0.875, the effect of reducing the outflow of dewatering well is similar to that of completely isolating aquifer. Considering the influence of waterproof curtain depth on the outflow of precipitation wells and the engineering cost, the insertion depth of waterproof wall should be between 0.875 and 1. The research results can provide theoretical guidance for the optimization of deep foundation pit waterproof wall of Zhengzhou subway station.

Keywords：foundation pit; dewatering wells; waterproof wall; insertion ratio; MIDAS GTS

作者簡(jiǎn)介 ：李龍  (1989—) ,  男，碩士研究生，工程師 ，研究方向 ：巖土工程等相關(guān)領(lǐng)域的研究。

通信作者 ：唐金召  (1998—) ,  男 ，碩士研究生，研究方向：地下工程。

收稿日期 ：2022- 08- 03