Abstract：For the deformation of excavations using the edge top-down construction method, the resisting lateral force provided by the inner structure is the key factor during the construction period. Combined with a practical project, a 3D finite element model is simulated and analyzed. Considering the mechanical properties of deep soft soils, the hardening-soil (HS) model is used. The deformation, ground settlement and stress distribution of the resisting lateral walls are analyzed and compared under four cases: the inner resisting lateral walls for one, two, three rows and the top-down floors fixed support at the end. The results show that compared with those of one row of the resisting lateral walls, the horizontal displacement of diaphragm wall and the settlement of ground with two and three rows of resisting lateral walls can be reduced by approximately 20% and 30%, and they are obviously smaller in the case of the top-down floors fixed support at the end, which increases the risk of engineering. According to the calculated results, some suggestions are given to optimize the design.
白成生 . 佛山东平广场坑边逆作深基坑变形数值分析[J]. 岩土工程学报, 2012, 34(suppl): 139-144.
BAI Cheng-sheng. Numerical analysis of deformation of excavation of Foshan Dongping Plaza using edge top-down construction method. Chinese J. Geot. Eng., 2012, 34(suppl): 139-144.
[1] 李斯海, 张自然, 丁毅深. 大基坑顺作/逆作复合工法在厦门市某基坑的应用[J]. 福建建设科技, 2011(6): 1–4. (LI Si-hai, ZHANG Zi-ran, DING Yi-shen. The application of normal and reverse compound construction in deep excavation in Xiamen[J]. Fujian Construction Science & Technology, 2011(6): 1–4. (in Chinese))[2] 郑信荣, 王飞飞. 大型深基坑顺、逆作结合施工技术[J]. 建筑施工, 2011, 33(4): 256–258. (ZHENG Xin-rong, WANG Fei-fei. Construction technology for large foundation pit with combination of normal and reversed construction method[J]. Building Construction, 2011, 33(4): 256–258. (in Chinese))[3] 李 伟. 顺逆结合的施工技术在地铁车站十字换乘段工程中的应用[J]. 建筑施工, 2010, 32(4): 297–299. (LI Wei. Ordinal and reversed construction technology applied to cross transfer section in metro station project[J]. Building Construction, 2010, 32(4): 297–299. (in Chinese))[4] 徐 军. 集合“顺作”与“逆作”优点的“半逆作”法工艺设计及施工探讨[J]. 建筑施工, 2004, 26(4): 286–288. (XU Jun. Study of design and construction with semi-reversed construction method combined with advantages of normal and reversed construction method[J]. Building Construction, 2004, 26(4): 286–288. (in Chinese))[5] 钱川国, 庄剑锋, 王志国. “半顺半逆作法”基坑开挖施工过程的有限元分析[J]. 建筑施工, 2006, 28(11): 866–868. (QIAN Chuan-guo, ZHUANG Jian-feng, WANG Zhi-guo. Finite element analysis of foundation pit excavation processes with “semi normal and semi reversed construction method[J]. Building Construction, 2006, 28(11): 866–868. (in Chinese))[6] 王旭军. 上海中心大厦裙房深大基坑工程围护墙变形分析[J]. 岩石力学与工程学报, 2012, 31(2): 421–431. (WANG Xu-jun. Analysis of retaining wall deformation for deep and big foundation pits of podium in Shanghai tower[J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(2): 421–431. (in Chinese)) [7] 杜建成, 张利民. 广州地区软土应力应变特性研究[J]. 四川联合大学学报(工程科学版), 1997, 1(1): 24–28. (DU Jian-cheng, ZHANG Li-min. Study on the stress–strain behavior of soft clay of Guangzhou[J]. Journal of Sichuan Union University (Engineering Science Edition), 1997, 1(1): 24–28. (in Chinese))[8] DG/TJ08—61—2010基坑工程技术规范[S]. 上海: 上海市城乡建设和交通委员会, 2010. (DG/TJ08—61—2010 Technical code for excavation engineering[S]. Shanghai: Shanghai Urban Construction and Communications Commission, 2010. (in Chinese))
