岩土材料的非线性统一强度模型

杜修力; 马超; 路德春

doi:10.6052/0459-1879-13-312

岩土材料的非线性统一强度模型

北京工业大学城市与工程安全减灾教育部重点实验室, 北京 100124
首都世界城市顺畅交通协同创新中心, 北京 100124

基金项目: 国家自然科学基金（91215301，51278012）、国家重点基础研究发展计划（2011CB013600）和北京工业大学博士生创新奖学金资助项目.

详细信息

作者简介:
杜修力，教授，主要研究方向：地震工程.E-mail：duxiuli@bjut.edu.cn

中图分类号: TU47
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出版历程
- 收稿日期: 2013-09-08
- 修回日期: 2013-12-20
- 刊出日期: 2014-05-17

NONLINEAR UNIFIED STRENGTH MODEL OF GEOMATERIALS

Key Lab of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China
Beijing Collaborative Innovation Center for Metropolitan Transportation, Beijing 100124, China

Funds: The project was supported by the National Natural Science Foundation of China (91215301, 51278012), the National Basic Research Program of China (2011CB013600) and the Doctoral Fund of Innovation of Beijing University of Technology.

摘要

摘要: 将材料的破坏归结为剪切破坏，每种材料对应于特定的剪切滑动面，抗剪强度为滑动面上正应力的函数，基于不同材料的强度特性将一系列的剪切滑动面统一起来，建立了岩土材料的非线性统一强度模型.非线性统一强度模型的滑动面为β应力空间内的等倾面，在β应力空间内的强度面为圆锥面；在普通应力空间内的强度面为一系列连续光滑、外凸的锥面，在偏平面上强度曲线涵盖了从下限Matsuoka-Nakai曲线到上限Drucker-Prager圆之间的所有区域，子午面上强度线为直线.非线性统一强度模型只有3个材料参数，参数都具有明确的物理意义，通过与国内外学者已取得的岩土类材料真三轴强度试验结果的比较，表明模型可适用于多种类型的材料，并合理描述其非线性强度特性.
- 土 /
- 混凝土 /
- 岩石 /
- 统一强度理论 /
- 非线性
Abstract: The failure of material can be concluded to the shear fracture and each material has a specific shear sliding surface. The shear strength is the function of normal stress on sliding surface. A series of shear sliding surface is unified and nonlinear unified strength model of geo-materials is proposed. Sliding surface of nonlinear unified strength model is isoclinic surface in β stress space. The Strength surface of nonlinear unified strength model is circular conical surface in the β stress space and a series of conical surfaces are continuous smooth and convex in principal stress space. The nonlinear unified strength model can be illustrated as a curve between the Drucker-Prager and SMP in deviatoric plane, and as a straight line in meridian plane. There are only three mechanical parameters in the model which have definite physical meanings. Compared with large numbers of data under true triaxial tests, the applicability of nonlinear unified strength model is verified to different materials. And the proposed model can describe the nonlinear strength property of various materials reasonably.
- soil /
- concrete /
- rock /
- unified strength theory /
- nonlinear

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