Vertical bearing behavior and pile group effect for cemented-soil composite pile groups based on on-site experiments

IF 4.2 2区工程技术 Q1 ENGINEERING, GEOLOGICAL

Soil Dynamics and Earthquake Engineering Pub Date : 2024-11-18 DOI:10.1016/j.soildyn.2024.109090

Zhiyu Gong , Guoliang Dai , Xinsheng Chen , Haoran Ouyang , Tao Hu , Zhiwei Chen

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引用次数: 0

Abstract

Bearing characteristics and interactions of a pile group are complex. and there is almost no on-site full-scale test data for cemented-soil composite pile group. In this research, vertical static load tests were conducted on two isolated pile, two-pile group and six-pile group for long-core SDCM pile. The bearing behavior of long-core SDCM pile and the interaction between pile groups have been studied. The results indicate that the long-core SDCM single pile is a typical friction type pile, and cemented soil provides most of the lateral friction resistance for the bearing capacity. In pile groups, pile spacing is the main factor affecting the pile group effect. The model calculation results based on the equivalent pier method are verified using on-site test data and the key parameters in the pile group for long-core SDCM pile including pile spacing S_ij, cemented soil Elastic modulus E_c and PHC pipe pile Elastic modulus E_p are analyzed using a mathematical model. Parameter analysis results indicate that the pile group interaction for long-core SDCM pile is mainly reflected in settlement. Group effect is inapparent at pile spacing greater than 4 D. The appropriate value of E_c and E_p are taken in the range of 1.2–1.6 GPa and 30–40 GPa.

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基于现场实验的水泥土复合桩群的垂直承载行为和桩群效应

桩群的承载特性和相互作用非常复杂，而且几乎没有针对水泥土复合桩群的现场全尺寸试验数据。本研究对长芯 SDCM 桩的两个孤立桩、两个桩群、六个桩群进行了竖向静载试验。研究了长芯 SDCM 桩的承载行为以及桩群之间的相互作用。结果表明，长芯 SDCM 单桩是典型的摩擦型桩，固结土为承载力提供了大部分侧向摩擦阻力。在桩群中，桩间距是影响桩群效应的主要因素。利用现场试验数据验证了基于等效墩法的模型计算结果，并通过数学模型分析了长芯 SDCM 桩的桩群关键参数，包括桩间距 Sij、胶结土弹性模量 Ec 和 PHC 管桩弹性模量 Ep。参数分析结果表明，长芯 SDCM 桩的桩群相互作用主要体现在沉降上。Ec 和 Ep 的合适取值范围分别为 1.2-1.6 GPa 和 30-40 GPa。

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来源期刊

Soil Dynamics and Earthquake Engineering 工程技术-地球科学综合

CiteScore

7.50

自引率

15.00%

发文量

446

审稿时长

8 months

期刊介绍： The journal aims to encourage and enhance the role of mechanics and other disciplines as they relate to earthquake engineering by providing opportunities for the publication of the work of applied mathematicians, engineers and other applied scientists involved in solving problems closely related to the field of earthquake engineering and geotechnical earthquake engineering. Emphasis is placed on new concepts and techniques, but case histories will also be published if they enhance the presentation and understanding of new technical concepts.