884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

(1 華東建筑集團(tuán)股份有限公司, 上海 200011; 2 華東建筑設(shè)計(jì)研究院有限公司, 上海 200002;3 上海隧道工程有限公司, 上海 200002)

摘要: 上海蘇州河段深層排水調(diào)蓄管道系統(tǒng)工程中的苗圃豎井基坑直徑 30m,挖深 56. 3m,為軟土地區(qū)超深圓形基坑工程. 由于原設(shè)計(jì)逆作內(nèi)襯墻方案多達(dá) 15 個(gè)施工工況,施工組織難度大,提出了豎向設(shè)置 5 道環(huán)梁的順作優(yōu)化方案. 基坑開挖前采用三維 m 法,考慮土與結(jié)構(gòu)共同作用的三維有限元法分別對(duì)優(yōu)化方案和原設(shè)計(jì)方案進(jìn)行了模擬分析. 結(jié)果表明:優(yōu)化方案的地下連續(xù)墻滿足承載力要求,驗(yàn)證了優(yōu)化方案的可行性. 采用優(yōu)化方案實(shí)施的苗圃豎井基坑實(shí)測(cè)數(shù)據(jù)與計(jì)算結(jié)果規(guī)律基本一致;地下連續(xù)墻側(cè)向變形很小,對(duì)周邊建(構(gòu))筑物影響也很小;地下連續(xù)墻表現(xiàn)出以環(huán)向軸壓為主、豎向受彎為輔的受力性態(tài). 苗圃豎井基坑采用順作優(yōu)化方案,實(shí)施順利并取得了良好的技術(shù)經(jīng)濟(jì)效果,為軟土地區(qū)類似超深圓形基坑工程設(shè)計(jì)和施工提供了借鑒.

關(guān)鍵詞: 超深圓形基坑; 軟土; 三維分析; 優(yōu)化方案; 變形性狀

中圖分類號(hào):TU318+.1 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002?848X(2022)10?0001?10

DOI:10. 19701 / j.jzjg.20211998

Optimal design and practice of a 56m ultra?deep circular excavation in soft soils

WANG Weidong1, XU Zhonghua2, ZONG Ludan2, ZHU Yanfei3, WENG Qiping2

(1 East China Construction Group Co., Ltd., Shanghai 200011, China; 2 East China Architecture Design & ResearchInstitute Co., Ltd., Shanghai 200002, China; 3 Shanghai Tunnel Engineering Construction Co., Ltd., Shanghai 200002, China)

Abstract: The diameter and excavation depth of the Miaopu shaft circular excavation of the deep tunnel sewerage project ofSuzhou River in Shanghai were 30m and 56. 3m, respectively, which was a ultra?deep circular excavation project in softsoils. In original design, the shaft would be excavated in 15 steps using top?down method. This would bring great difficultiesto construction organization. Therefore, an optimized bottom?up construction scheme with 5 ring beams was proposed. Threedimensional beam?spring model method and three dimensional finite element method considering the interaction of soils andstructures were used to simulate and analyze the original and the optimized construction scheme of the deep excavation. Theresults show that the diaphragm wall could sustain the lateral pressure during excavation using the optimized bottom?upconstruction scheme. Monitoring results showed that deformation of the circular diaphragm wall and the adjacent facilitieswere very small. The diaphragm wall was mainly subjected to circumferential axial compression and supplemented byvertical bending. These monitoring results were consistent with the calculation results. Good technical and economic result shave been achieved using the optimized bottom?up construction scheme and this provides a reference for the design andconstruction of similar ultra?deep circular excavation in soft soil area.

Keywords:ultra?deep circular excavation; soft soil; three dimensional analysis; optimal scheme; deformation behavior

∗上海市科學(xué)技術(shù)委員會(huì)科研計(jì)劃項(xiàng)目(No.13231201006).

第一作者:王衛(wèi)東,博士,全國(guó)工程勘察設(shè)計(jì)大師,教授級(jí)高級(jí)工程師,主要從事巖土工程研究,Email: weidong _wang@arcplus.com.

[引用本文] 王衛(wèi)東,徐中華,宗露丹,等. 軟土地區(qū) 56m 深圓形基坑的優(yōu)化設(shè)計(jì)與實(shí)踐[ J]. 建筑結(jié)構(gòu),2022,52(10):1?10. WANG Weidong,XU Zhonghua,ZONG Ludan,et al. Optimal design and practice of a 56m ultra?deep circularexcavation in soft soils[J]. Building Structure,2022,52(10):1?10.