American Society of Civil Engineers


Centrifuge Study on Ultra-Deep Foundation Pit Excavation in Soft Ground


by Qianwei Xu, (School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200030, People’s Republic of China. E-mail: xuqwtju@126.com), Xianfeng Ma, (Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai, 200092, People’s Republic of China. E-mail: xf.ma@tongji.edu.cn), Hehua Zhu, (Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai, 200092, People’s Republic of China. E-mail: zhuhehua@tongji.edu.cn), Xiurun Ge, (School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200030, People’s Republic of China. E-mail: xiurunge@public.wh.hb.cn), Yan Ping, (Lovat Trading (Shanghai) Co. Ltd., Shanghai 200003, People’s Republic of China. E-mail: ping.yan@lovat.com.cn), and Fangfang Jin, (Department of Civil Engineering, University of Shanghai for Science and Technology, Shanghai 200093, People’s Republic of China. E-mail: jff_001@163.com)
Section: Section 3: Innovative Foundations, pp. 292-299, (doi:  http://dx.doi.org/10.1061/41106(379)37)

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Document type: Conference Proceeding Paper
Part of: Deep Foundations and Geotechnical In Situ Testing
Abstract: In order to investigate the behaviors of the support systems and the associated ground deformations, centrifuge model test is adopted to simulate the excavation of ultra-deep foundation pit in soft ground. In this test, the geometrical scale is 1:120, and the soil layer thickness, excavation depth and retaining wall height are 60 cm, 31.6 cm and 54.2 cm respectively. The model ground consists of two types of soil, including silty clay and sandy silt. The aluminum alloy plate and aluminum alloy pipes are used to simulate reinforced concrete diaphragm wall and braces respectively. The retaining wall deformation, bending moment, brace axial force, earth pressure around the retaining wall, ground surface settlement, etc. are measured and discussed in detail in this paper. This can be used to comprehensively assess the stability of pit excavation support system. The findings from the centrifuge study are particularly useful for practical engineering.


ASCE Subject Headings:
Centrifuge
Deep foundations
Excavation
Soft soils