姜彦彬,丁元芳,钱亚俊,等. 刚性桩复合地基离心试验插桩制模研究[J]. 水利水运工程学报,2023(5):123-130. doi: 10.12170/20220424003
引用本文: 姜彦彬,丁元芳,钱亚俊,等. 刚性桩复合地基离心试验插桩制模研究[J]. 水利水运工程学报,2023(5):123-130. doi: 10.12170/20220424003
(JIANG Yanbin, DING Yuanfang, QIAN Yajun, et al. Study on the pile insertion and model preparation in centrifugal test of rigid pile composite foundation[J]. Hydro-Science and Engineering, 2023(5): 123-130. (in Chinese)). doi: 10.12170/20220424003
Citation: (JIANG Yanbin, DING Yuanfang, QIAN Yajun, et al. Study on the pile insertion and model preparation in centrifugal test of rigid pile composite foundation[J]. Hydro-Science and Engineering, 2023(5): 123-130. (in Chinese)). doi: 10.12170/20220424003

刚性桩复合地基离心试验插桩制模研究

Study on the pile insertion and model preparation in centrifugal test of rigid pile composite foundation

  • 摘要: 土工离心模型试验是研究复合地基关键问题的前沿手段,饱和黏土工况下的刚性桩复合地基离心模型制作复杂,影响因素较多。基于多组刚性桩复合地基离心模型的制备过程分析,探讨了1g下插桩制模对离心模型地基抗剪强度的影响。试验结果表明:离心模型地基制样扰动与插桩方式相关,先引孔、后插桩有益于减少制样扰动。1g制模过程中,黏土模型地基的不排水抗剪强度有所损失,插桩制作扰动与1g下模型静置是导致饱和模型地基强度损失的主要原因,且复合地基上层软土抗剪强度的降低程度大于下部持力层。离心模型对比试验应充分考虑模型土样应力历史的相似性。研究提出了理想的刚性桩复合地基离心模型试验步骤,可为提升土工离心模型试验的精细化水平提供参考。

     

    Abstract: Geotechnical centrifuge model test is an advanced technology to study the key issues of composite foundation. The centrifugal modelling of rigid pile composite foundation under saturated clay condition is complex and has numbers of influencing factors, which should be paid enough attention to. Based on the analysis of the preparation process of centrifuge model of several groups of rigid pile composite foundation, this paper discusses the influence of 1g pile insertion modelling on the shear strength of the foundation model. It is shown that the disturbance of sample preparation of centrifugal model foundation is related to the way of pile insertion, and it is beneficial to reduce the disturbance of sample preparation to guide a hole before inserting the pile. The undrained shear strength of the clay model foundation will be weakened during the molding process under 1g. The comparative analysis shows that the disturbance of pile insertion and the model preparation under 1g are the main reasons for the strength loss of the saturated foundation model. The reduction of shear strength of upper soft soil of composite foundation is greater than that of the lower bearing layer. The similarity of stress history of the soil samples should be fully considered in the centrifugal model comparison test. An ideal centrifuge modelling procedure of rigid pile composite foundation is proposed, which provides an important reference for improving the refinement level of geotechnical centrifugal model test.

     

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