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(1 東華理工大學(xué)土木與建筑工程學(xué)院， 南昌 330013；2 東華理工大學(xué)核資源與環(huán)境國家重點(diǎn)實(shí)驗室， 南昌 330013)
［摘要］ 為了解決深大基坑在建筑物緊貼、施工空間狹窄、地質(zhì)條件差等復(fù)雜環(huán)境下的基坑支護(hù)難題，依托某工程實(shí)例，結(jié)合場地條件及基坑周圍環(huán)境，分析了該工程的難點(diǎn)，提出了拉森鋼板樁墻＋逆作法主體結(jié)構(gòu)板水平內(nèi)支撐＋深層水泥攪拌樁隔水帷幕的支護(hù)方案，并對支護(hù)結(jié)構(gòu)構(gòu)件進(jìn)行了計算和設(shè)計。結(jié)果表明，在進(jìn)行基坑施工的過程中，基坑周圍緊貼建筑物未發(fā)生開裂、地面不均勻沉降以及基坑滲漏。基坑支護(hù)方案的隔水效果和支護(hù)效果都較好，可為類似地區(qū)的工程提供經(jīng)驗參考。
［關(guān)鍵詞］深大基坑；拉森鋼板樁；逆作法；基坑支護(hù)設(shè)計；地下工程
中圖分類號：TU476+.9 文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)22-0141-06
Design of Larsen steel sheet pile + internal strut of reversed construction method in retaining and supporting for deep and large foundation pit in complex environment
LI Guang1, YANG Zeping1, ZHANG Minsi1, CHENG Xinjun1, LIANG Hai′an1,2, HU Guangyang1, ZENG Hao1
(1 School of Civil and Architectural Engineering, East China University of Technology, Nanchang 330013， China；2 State Key Laboratory of Nuclear Resources and Environment, East China University of technology, Nanchang 330013， China)
Abstract: In order to solve the trouble of deep and large foundation pit support in complex environments such as existing building restrictions, narrow construction space and poor geological conditions, relying on an engineering example, combining the site conditions and the surrounding environment of the foundation pit. The difficulties of the project were analyzed, and the support plan of Larsen steel sheet pile retaining wall + horizontal internal support of main structural plate in reversed construction method + deep cement mixing pile water-proof curtain was proposed. And supporting structural members were calculated and designed. The results show that during the construction of the foundation pit, no cracking, uneven ground settlement and leakage of the foundation pit occurred in the surrounding buildings. The water isolation effect and supporting effect of the foundation pit support scheme are very good, which can provide experience reference for projects in similar areas.
Keywords:deep and large foundation pit； Larsen steel sheet pile； reversed construction method； foundation pit support design； underground engineering
*國家自然科學(xué)基金地區(qū)項目（51864001），中國地震局地震工程與工程振動重點(diǎn)實(shí)驗室開放研究專項（2020D24）。
作者簡介：李廣，碩士研究生，Email： 1264610347@qq.com； 通信作者：楊澤平，碩士，副教授，Email：zpyang@ecit.edu.cn。
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