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崔澤海 ，樊鵬鵬 ，胡發(fā)旺 ，李新強(qiáng) ，欒    蔚 

（ 中國建筑第八工程局有限公司 ，甘肅 蘭州 730030)

摘   要：SMW 工法樁與環(huán)形支撐的聯(lián)合支護(hù)體系逐漸在基坑工程中實(shí)際應(yīng)用，分析其支護(hù)效果和支護(hù)樁 的受力性能對工程實(shí)際具有重要意義 。基于某基坑工程實(shí)際 ，運(yùn)用有限差分程序建立數(shù)值模型，分析其降水及 多次開挖工況下土體的位移和支護(hù)樁的變形特征 。研究結(jié)果表明： 降水工況下，基坑的土體沉降主要集中在開 挖范圍內(nèi)及基坑的邊緣處 ，隨著開挖的進(jìn)行 ，基坑邊緣土體沉降線呈圓弧狀，坑底土體因卸荷會產(chǎn)生回彈，最大回彈值約為 4. 5 mm; 基坑開挖對距邊緣 25 m 范圍內(nèi)的土體影響較大，從地表至地下 6. 5 m 影響逐漸減小； 基 坑側(cè)壁的變形隨開挖加深而增大，呈現(xiàn)出先增大后減小的趨勢，支護(hù)樁在坑邊中心位置變形最大，承受較多的荷載，且對于環(huán)形內(nèi)支撐體系，整體受力均勻，研究結(jié)果可為基坑支護(hù)工程提供參考。

關(guān)鍵詞： SMW 工法樁； 環(huán)形支撐； 基坑支護(hù)； 數(shù)值模擬

中圖分類號： TU 753      

文獻(xiàn)標(biāo)志碼： A      

文章編號： 1005-8249 (2023) 06-0008-09

 DOI : 10. 19860/j.cnki.issn1005-8249.2023.06.002

 

CUI Zehai , FAN Pengpeng , HU Fawang , LI Xinqiang , LUAN Wei

( China Construction Eighth Engineering Division Co. ，Ltd. ，Lanzhou 730030 , China)

Abstract: The combined supporting system of SMW pile and ring support is gradually applied in foundation pit engineering. It is of great significance to analyze the supporting effect and the mechanical performance of the supporting pile for engineering practice. Based on the engineering practice of a foundation pit, the finite difference program is used to establish a numerical model to analyze the displacement of soil and the deformation characteristics of supporting piles under dewatering and multiple excavation conditions. The results show that：Under the condition of dewatering, the soil settlement of the foundation pit is mainly concentrated in the excavation range and the edge of the foundation pit. With the excavation, the settlement line of the soil at the edge of the foundation pit is circular. The soil at the bottom of the pit will rebound due to unloading, and the maximum rebound value is about 4.5 mm. The excavation of foundation pit has a great influence on the soil within 25 m from the edge, and the influence gradually decreases from the surface to the underground 6.5 m. The deformation of the side wall of the foundation pit increases with the deepening of excavation, showing a trend of increasing first and then decreasing. The deformation of the supporting pile at the center of the pit is the largest, and it bears more loads. For the annular internal support system, the overall stress is uniform. The research results can provide reference for foundation pit support engineering.

 Keywords : SMW piles ; ring support; foundation pit; numerical simulation

?基金項(xiàng)目： 中建八局科技研發(fā)項(xiàng)目： 高原高寒地區(qū)大型會展中心綜合建造技術(shù)。 

作者簡介： 崔澤海  (1990—) , 男 ，高級工程師 ，主要從事建筑施工方面的研究。

通訊作者： 欒蔚  (1987—) , 男 ，高級工程師 ，博士 ，主要從事結(jié)構(gòu)基礎(chǔ)施工方面的研究。 

收稿日期： 2023-05-26