Comparative analysis of pit deformation characteristics in typical region soft soil deposits of China
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ORIGINAL PAPER
Comparative analysis of pit deformation characteristics in typical region soft soil deposits of China Shijie Li 1 & Zhen Huang 1,2 & Kui Zhao 1 & Hongwei Xu 1 & Qing Fang 1 Received: 17 July 2018 / Accepted: 16 May 2019 / Published online: 6 June 2019 # Saudi Society for Geosciences 2019
Abstract In this study, statistical analysis and numerical simulation based on Shanghai and Suzhou soft ground pit data is used to analyze the laws of maximum deflection of the diaphragm wall, maximum ground settlement, and their relationship. The results show that the deformation characteristics of pits are different in the two regions, and the deformation of pits in Shanghai is greater. The maximum deflection of the diaphragm wall ranges from 0.066 to 0.960 %H, and the average value is 0.364 %H in Shanghai. In Suzhou, maximum deflection ranges from 0.05 to 0.30 %H, and the average value is 0.16 %H. The maximum ground settlement in Shanghai spans from 0.079 to 0.510 %H, the average value is 0.248 %H, and it ranges from 0.03 to 0.168 %H. Meanwhile, the average value was 0.089 %H in Suzhou. These results provide a useful reference for the design and construction of excavation projects in both regions. Keywords Pit excavation . Diaphragm wall . Statistical analysis . Numerical simulation
Introduction The rapid development of China’s economy is producing an increasing number of foundation pits in urban agglomerative regions, particularly in developed coastal cities such as Shanghai and Suzhou. As a consequence, there is a rising number of foundation pits which are deep, large sized, close to buildings, and hurriedly excavated (Xue et al. 2013; Liu et al. 2011), and reducing the impact of pit excavation to the surrounding buildings is critical (Huang et al. 2015; Huang et al. 2012). Since the 1960s, various researchers have studied the deformation characteristics of pits. Goldberg et al. (1976), Mana and Clough (1981), and Ou et al. (1993) developed understanding of the relationship between the deflection of the diaphragm wall, the ground settlements, and the excavation depth, using a large amount of measured data. Li Editorial handling: M. Karakus * Zhen Huang [email protected]; [email protected] 1
School of Resources and Environment Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu, China
et al. (2005) presented a theoretical mathematical model on the ground surface settlement induced by pit excavation using the fuzzy mathematics method. Lin et al. (2015) studied the deformation behaviors in different periods of pit excavation using FLAC3D software. Tan and Wang (2013a, b) collected measured data from the Shanghai World Finance Center building and 33 other top-down excavations in Shanghai, and obtained a relationship between the pit area and the ground surface settlement. Wang (2012) investigated the deformations of the retaining walls, soil outside the pits, and the ground surface settleme
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