基于扰动状态概念的桩-土接触面荷载传递模型

doi:10.12068/j.issn.1005-3026.2021.12.015

东北大学学报（自然科学版） ›› 2021, Vol. 42 ›› Issue (12): 1775-1781.DOI: 10.12068/j.issn.1005-3026.2021.12.015

基于扰动状态概念的桩-土接触面荷载传递模型

贾羽¹，张家生^1,2，张飞³，廖湘英⁴

(1. 中南大学土木工程学院，湖南长沙410083; 2. 中南大学教育部重载铁路工程结构重点实验室，湖南长沙410083; 3. 安徽省交通规划设计研究总院股份有限公司，安徽合肥230088; 4. 长沙市美的房地产开发有限公司，湖南长沙410600)

修回日期:2021-04-14 接受日期:2021-04-14 发布日期:2021-12-17
通讯作者: 贾羽
作者简介:贾羽(1990-)，男，内蒙古赤峰人，中南大学博士研究生；张家生(1964-)，男，湖南长沙人，中南大学教授.
基金资助:
国家自然科学基金资助项目(51978674)；中国铁路总公司科技研究开发计划项目(2017G008-A).

Load Transfer Model of Pile-Soil Interface Based on the Disturbed State Concept

JIA Yu¹， ZHANG Jia-sheng^1,2， ZHANG Fei³， LIAO Xiang-ying⁴

1. School of Civil Engineering， Central South University， Changsha 410083， China; 2. MOE Key Laboratory of Engineering Structures of Heavy Haul Railway， Central South University， Changsha 410083， China; 3. Anhui Transport Consulting & Design Institute Co. Ltd.， Hefei 230088， China; 4. Changsha Midea Real Estate Group Co.， Ltd.， Changsha 410600， China.

Revised:2021-04-14 Accepted:2021-04-14 Published:2021-12-17
Contact: ZHANG Fei
About author:-
Supported by:
-

摘要/Abstract

摘要： 基于扰动状态概念(DSC)，假定桩-土接触面单元中相对完整(RI)状态部分的抗剪强度服从线弹性理论，完全调整(FA)状态部分的抗剪强度服从理想塑性理论，进而建立桩-土接触面荷载传递模型.针对桩-土接触面进行了大型直剪试验，试验结果表明:桩-红黏土接触面剪切过程中，接触面表现出应变软化特性，且随着法向应力的增加，软化现象越明显;桩-粉质黏土接触面剪切过程中，接触面表现出轻微应变硬化特性.利用桩-土接触面荷载传递模型计算得到的剪切应力-剪切位移曲线(τ-s曲线)与直剪试验得到的τ-s曲线吻合较好，验证了基于DSC的桩-土接触面荷载传递模型具有较好的准确性与适用性.

关键词: 扰动状态概念(DSC);桩-土接触面;荷载传递模型;τ-s曲线;大型直剪试验

Abstract: Based on the disturbed state concept(DSC)， it is assumed that the shear strength of the relative intact(RI)part of the pile-soil interface obeys the linear elastic theory， and the shear strength of the fully adjusted(FA)part obeys the ideal plastic theory， so that the pile-soil interface load transfer model can be established.A large-scale direct shear test was carried out on the pile-soil interface， which shows that the strain exhibits softening characteristics during the shear process between the pile and red clay interface， and the softening phenomenon becomes more significant with the increase of the normal stress.The strain exhibits slightly hardening characteristics during the shearing process between the pile and silty clay interface. The shear stress-shear displacement curves(τ-s curves) calculated by using the pile-soil interface load transfer model is in good agreement with the τ-s curves obtained from the direct shear test， which proved that the load transfer model of pile-soil interface based on DSC has a good accuracy and applicability.

Key words: disturbed state concept(DSC); pile-soil interface; load transfer model; τ-s curves; large-scale direct shear test

中图分类号:

TU473

贾羽，张家生，张飞，廖湘英. 基于扰动状态概念的桩-土接触面荷载传递模型[J]. 东北大学学报（自然科学版）, 2021, 42(12): 1775-1781.

JIA Yu， ZHANG Jia-sheng， ZHANG Fei， LIAO Xiang-ying. Load Transfer Model of Pile-Soil Interface Based on the Disturbed State Concept[J]. Journal of Northeastern University(Natural Science), 2021, 42(12): 1775-1781.

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基于扰动状态概念的桩-土接触面荷载传递模型

Load Transfer Model of Pile-Soil Interface Based on the Disturbed State Concept

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