A new pile-soil interface and its application in battered mini piles under monotonic lateral load in cohesive soil

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Haran Gananathan, Mahdi Disfani, Yinghui Tian, Guillermo Narsilio
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引用次数: 0

Abstract

Numerical modelling of laterally loaded piles requires a robust pile-soil interface model. The conventional Coulomb friction model has limitations when predicting the soil-structure interaction at shallow depths for battered mini piles (BMPs) in cohesive (fine-grained) soils. This paper proposes an efficient pile-soil interface model to simulate laterally loaded BMPs in cohesive soils using three-dimensional finite element models (FEM). BMP systems have been commonly used to support lateral load-dominated lightweight superstructures. They are hybrid foundations with BMPs oriented at different inclinations and directions, mimicking tree root systems. FEM results indicate that the Coulomb model is unsuitable for simulating the pile-soil interface at shallow depth due to underprediction of shear resistance. The proposed interface model comprising a surface-to-surface cohesive damage interface with friction captures the lateral performance of BMPs accurately. The proposed model was implemented for a range of pile and soil properties to verify its suitability in understanding the behaviour of BMPs. The ultimate lateral capacity of BMPs increases with penetration length up to 1.5 m. While an increase in diameter and undrained shear strength increases the capacity, the lateral load eccentricity negatively impacts it. Interaction diagrams are developed to serve engineers estimate the ultimate lateral capacity of BMPs.
一种新的桩-土界面及其在粘性土单调侧向荷载下破碎微型桩中的应用
横向荷载桩的数值模拟需要一个鲁棒的桩-土界面模型。传统的库仑摩擦模型在预测粘聚(细粒)土中破碎小桩浅深度土-结构相互作用时存在局限性。本文提出了一种有效的桩-土界面模型,利用三维有限元模型来模拟黏性土中横向荷载作用下的桩-土界面。BMP系统通常用于支撑横向荷载主导的轻型上层结构。它们是混合地基,具有不同倾斜度和方向的bmp,模仿树根系统。有限元分析结果表明,库仑模型由于对桩-土界面的抗剪力预测不足,不适合模拟桩-土界面的浅深度。所提出的界面模型包含有摩擦的面-面黏结损伤界面,能够准确地捕捉bmp的横向性能。提出的模型用于一系列桩和土的性质,以验证其在理解bmp行为方面的适用性。当侵彻长度达到1.5 m时,bmp的极限侧向承载力增加。增大管径和不排水抗剪强度可以提高承载力,但横向荷载偏心对承载力有不利影响。开发了交互图,以帮助工程师估计bmp的最终横向能力。
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
Computers and Geotechnics
Computers and Geotechnics 地学-地球科学综合
CiteScore
9.10
自引率
15.10%
发文量
438
审稿时长
45 days
期刊介绍: The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.
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