基于CPTU测试的海相软土刚性桩复合地基承载特性研究

Hazard Control in Tunnelling and Underground Engineering

2019, Vol. 1

Issue (3): 46-56 DOI:

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Bearing characteristics of rigid pile composite foundation in marine soft soil based on CPTU

CAI Guojun, LIU Lulu, GONG Shen, LIU Songyu

Institute of Geotechnical Engineering, Southeast University, Nanjing 211189, Jiangsu, China

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Abstract Through on-site CPTU testing, software which interprets CPTU data was used to interpret the test data, and CPTU method was used to classify the site and stratify the soil layer. The physical and mechanical parameters of the soil in the engineering area were calculated, and the applicability of CPTU technology in deep marine soft soil area was proved by comparing the indoor test results. The CPTU method was used to predict the vertical bearing capacity of pile foundation theoretically. The numerical model of rigid pile composite foundation was established, and the field static load test was simulated. The results of single pile vertical ultimate bearing capacity of composite foundation obtained by theoretical formula calculation, numerical simulation and field static load test were compared and analyzed, and the failure forms of composite foundation are discussed. On this basis, the determination of bearing capacity characteristic value of single pile in composite foundation was deeply studied and the interaction mechanism between pile and soil in composite foundation and the working behavior under design load were studied.

Key words： piezocone penetration test(CPTU) marine soft soil rigid pile composite foundation bearing capacity numerical simulation

Received: 09 April 2019 Published: 13 November 2019

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Cite this article:

CAI Guojun,LIU Lulu,GONG Shen, et al. Bearing characteristics of rigid pile composite foundation in marine soft soil based on CPTU[J]. Hazard Control in Tunnelling and Underground Engineering, 2019, 1(3): 46-56.

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http://tunnel.sdujournals.com/EN/ OR http://tunnel.sdujournals.com/EN/Y2019/V1/I3/46

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