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田鵬剛^1 , 3 ,  牛建輝^1 , 3 ,  楊永林² ,  王明皎² ,  王勇華² ,   卜崇鵬² ,  蒲   靖^1 , 3

( 1 .  陜西建工控股集團(tuán)未來(lái)城市創(chuàng)新科技有限公司 ，陜西 西安 712000 ;  2.  機(jī)械工業(yè)勘察設(shè)計(jì)研究院

有限公司 ，陜西 西安 710021 ;  3 .  未來(lái)城市建設(shè)與管理創(chuàng)新聯(lián)合研究中心 ，陜西 西安 712000)

摘   要 ：隨著城市化快速發(fā)展和土地資源的日益緊張 ，城市建設(shè)中深基坑工程日漸增多。而工程延期 、方案變更和施工困難等導(dǎo)致的基坑超期服役問(wèn)題也伴隨出現(xiàn) ，這不僅增加建設(shè)成本，還帶來(lái)環(huán)境與安全風(fēng)險(xiǎn)。因此 ，實(shí)施有效的二次加固設(shè)計(jì)至關(guān)重要。依托西安某超期深基坑工程實(shí)例，采用支護(hù)構(gòu)件強(qiáng)度折減法對(duì)錨拉樁、復(fù)合土釘墻及懸臂樁三個(gè)支護(hù)形式的斷面進(jìn)行加固設(shè)計(jì)，建立深基坑的有限元模型 ，模擬分析該深基坑加固前后的穩(wěn)定性及位移。結(jié)果表明：采用支護(hù)構(gòu)件強(qiáng)度折減法進(jìn)行基坑加固設(shè)計(jì)后，數(shù)值模擬結(jié)果與實(shí)測(cè)值吻合較好，基坑的整體穩(wěn)定性 、水平變形及豎向變形均符合規(guī)范要求。支護(hù)構(gòu)件強(qiáng)度折減法加固超期地基合理有效。

關(guān)鍵詞：超期深基坑 ；支護(hù)構(gòu)件 ；強(qiáng)度折減法 ；Midas GTS;  基坑加固設(shè)計(jì)

中圖分類號(hào)：TU473            

文獻(xiàn)標(biāo)志碼：A           

文章編號(hào)： 1005- 8249   (2024)  04- 0067- 07

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.04.012

TIAN Penggang^{1 , 3}  ,  NIU Jianhui ^{1 , 3}  ,  YANG Yonglin² ,  WANG Mingjiao² ,  WANG Yonghua² , BO Chongpeng² ,  PU Jing^{1 , 3}

( 1 . Future City Innovation Technology Co. ，Ltd. ，Shaanxi Construction Engineering Holding Group , Xi ’an 712000 ,  China;  2. China Jikan Research Institute of Engineering Investigation and

Design Co. ，Ltd. ，Xi ’an 710021 ,  China;  3 . SCEGC- XJTU  Joint  Research

Center for Future City Construction and Management Innovation ,  Xi ’an 712000 ,  China)

Abstract: With the rapid development of urbanization and the increasing scarcity of land resources, the deep foundation pit projects are increasing in the urban construction .is continuously on the rise. The problems of foundation pit services extension caused by projects delay scheme and construction difficulties alse occur,which not only increases construction costs but also poses environmental and safety risks. Therefore, implementing an effective secondary reinforcement design is of utmost importance. This paper, based on a case study of an over-service deep foundation pit project in Xi'an, uses the strength reduction method of support components to reinforce the sections of three types of support forms: anchor piles, composite soil nail walls, and cantilever piles. A finite element model of the deep foundation pit is established to simulate and analyze the stability and displacement before and after reinforcement. The results indicate that after the reinforcement design of the foundation pit using the strength reduction method of support components, the numerical simulation results are in good agreement with the actual measured values, and the overall stability, horizontal deformation, and vertical deformation of the foundation pit all comply with the regulatory requirements. The reinforcement of the over-serviced foundation using the strength reduction method of support components is rational and effective.

Keywords： overdue deep foundation pit;support components;strength reduction method;Midas GTS;reinforcement design of the foundation pit

作者簡(jiǎn)介： 田鵬剛  (1978—) ,  男 ，博士 ，教授級(jí)高級(jí)工程師 ，研究方向： 文物建筑預(yù)防性保護(hù)和工程結(jié)構(gòu)事故處理。

收稿日期：2023- 06- 19