Effects of cement-enhanced soil on the ultimate lateral resistance of composite pile in clayey soil

IF 9.4 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Journal of Rock Mechanics and Geotechnical Engineering Pub Date : 2024-01-01 DOI:10.1016/j.jrmge.2023.03.010

Zhijun Yang , Kexin Chen , Xudong Fu , Zhiyan Zou

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引用次数: 0

Abstract

The composite pile consisting of core-pile and surrounding cement-enhanced soil is a promising pile foundation in recent years. However, how and to what extent the cement-enhanced soil influences the ultimate lateral resistance has not been fully investigated. In this paper, the ultimate lateral resistance of the composite pile was studied by finite element limit analysis (FELA) and theoretical upper-bound analysis. The results of FELA and theoretical analysis revealed three failure modes of laterally loaded composite piles. The effects of the enhanced soil thickness, strength, and pile-enhanced soil interface characteristics on the ultimate lateral resistance were studied. The results show that increasing the enhanced soil thickness leads to a significant improvement on ultimate lateral resistance factor (N_P), and there is a critical thickness beyond which the thickness no longer affects the N_P. Increasing the enhanced soil strength induced 6.2%–232.6% increase of N_P. However, no noticeable impact was detected when the enhanced soil strength was eight times higher than that of the natural soil. The maximum increment of N_P is only 30.5% caused by the increase of interface adhesion factor (α). An empirical model was developed to calculate the N_P of the composite pile, and the results show excellent agreement with the analytical results.

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水泥增强土对粘性土中复合桩极限侧阻力的影响

近年来，由桩芯和周围的水泥土增强土组成的复合桩是一种很有前途的桩基。然而，水泥增强土如何以及在多大程度上影响极限侧向阻力尚未得到充分研究。本文通过有限元极限分析（FELA）和理论上限分析研究了复合桩的极限侧向阻力。有限元极限分析和理论分析的结果揭示了横向加载复合材料桩的三种破坏模式。研究了增强土厚度、强度和桩-增强土界面特性对极限侧向阻力的影响。结果表明，增加增强土厚度可显著提高极限侧向阻力系数（NP），且存在一个临界厚度，超过该厚度后，增强土厚度不再影响极限侧向阻力系数。提高增强土壤强度可使 NP 增加 6.2%-232.6%。然而，当增强土壤强度是天然土壤强度的 8 倍时，并没有发现明显的影响。界面粘附系数 (α)的增加仅导致 NP 最大增加 30.5%。建立了一个经验模型来计算复合桩的净压强，结果与分析结果非常吻合。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Rock Mechanics and Geotechnical Engineering Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

11.60

自引率

6.80%

发文量

227

审稿时长

48 days

期刊介绍： The Journal of Rock Mechanics and Geotechnical Engineering (JRMGE), overseen by the Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, is dedicated to the latest advancements in rock mechanics and geotechnical engineering. It serves as a platform for global scholars to stay updated on developments in various related fields including soil mechanics, foundation engineering, civil engineering, mining engineering, hydraulic engineering, petroleum engineering, and engineering geology. With a focus on fostering international academic exchange, JRMGE acts as a conduit between theoretical advancements and practical applications. Topics covered include new theories, technologies, methods, experiences, in-situ and laboratory tests, developments, case studies, and timely reviews within the realm of rock mechanics and geotechnical engineering.