Explicit calculation of sand unified model combining shear dilatancy softening and shear shrinkage hardening

LU Yong; ZHOU Guo-qing; YANG Dong-ying; SONG Jia-qing

doi:10.16285/j.rsm.2017.1970

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Explicit calculation of sand unified model combining shear dilatancy softening and shear shrinkage hardening

更新时间：2026-06-25

- Explicit calculation of sand unified model combining shear dilatancy softening and shear shrinkage hardening
- Vol. 40, Issue 3, Pages: 978-986(2019)
- 作者机构：
  
  1. 苏州科技大学土木工程学院
  2. 中国矿业大学深部岩土力学与地下工程国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2017.1970
  CLC： TU441
- Published：2019
- 稿件说明：
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[1]陆勇,周国庆,杨冬英,宋家庆.砂土剪胀软化、剪缩硬化统一本构的显式计算[J].岩土力学,2019,40(03):978-986.

LU Yong, ZHOU Guo-qing, YANG Dong-ying, et al. Explicit calculation of sand unified model combining shear dilatancy softening and shear shrinkage hardening[J]. 2019, 40(3): 978-986.
[1]陆勇,周国庆,杨冬英,宋家庆.砂土剪胀软化、剪缩硬化统一本构的显式计算[J].岩土力学,2019,40(03):978-986. DOI： 10.16285/j.rsm.2017.1970.

LU Yong, ZHOU Guo-qing, YANG Dong-ying, et al. Explicit calculation of sand unified model combining shear dilatancy softening and shear shrinkage hardening[J]. 2019, 40(3): 978-986. DOI： 10.16285/j.rsm.2017.1970.

摘要

密实砂土通常表现出常压下剪胀软化特性、高压下剪缩硬化特性

不同的力学特性对岩土体受荷力学行为的演化有着重要影响。构建能够反映剪胀软化、剪缩硬化特性的本构模型并且实现其数值模拟计算

则是分析剪胀软化材料的受荷响应特征以及完善岩土体渐进破坏理论所要解决的一个重要科学问题。研究中首先对已构建的能够反映密实砂土相关力学特性的砂土统一本构模型进行描述

分析该模型的数值计算关键问题。基于显式方法进行模型应力积分程序的二次开发

应力积分过程中采用应变空间中的加卸载准则并对模型破坏面进行光滑处理以满足计算过程中的加卸载判断以及塑性应变方向的确定。通过计算实例验证了显式方法能够克服剪胀、软化问题的计算难点

可以实现对剪胀软化、剪缩硬化材料的力学行为分析计算。

Abstract

Dense sand normally exhibits shear dilatancy softening under normal pressure and shear shrinkage hardening under high pressure. Therefore

unified model of sand and its numerical implementation is an important scientific problem for describing the loading response of dilatancy softening material

and it will also promote the progressive failure theory. In this study

the unified model of sand which reflects the mechanical properties of dense sand under normal and high pressure is firstly described

and then the key problem of numerical calculation for the model is analyzed. By using the explicit method

the secondary development of stress integration program is carried out. In the process of stress integration

loading-unloading criterion within strain space and smoothed failure surface are used for satisfying the judgment of loading condition and determination of plastic strain direction. An example is given to prove that the explicit method can overcome the difficulties in calculation for dilatancy and softening. This method shows a good way to analyze the mechanical behavior for materials with dilatancy softening and shrinkage hardening characteristics.

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