含应变软化本构关系的岩-土接触元直剪试验数值模拟

关于含应变软化本构关系的岩-土接触面特性的研究手段较为有限,基于FLAC可实现具有应变软化接触的本构数值分析。利用该模型对接触面直剪试验进行模拟,并对接触单元剪切强度参数演化与剪切应力-位移关系变化特征进行深入研究。模拟结果再现了接触面的渐进性破坏过程及内部剪应力变化特征,研究表明了摩擦角的增减变化主控剪切应力-位移关系曲线的形式特征。

Numerical simulation for direct shear tests with strain softening constitutive contact elements

Research tools for direct shear of geomaterials contact surfaces with strain softening constitutive characteristics is more limited, based on FLAC, strain softening constitutive contact element models is achieved in this paper. Using this element models, the direct shear tests are simulated; the relationships between the shear strength parameters evolution for contact elements and the formal features of shear stress-displacement curves are deeply studied. The progressive failure process of the contact surfaces and the variation characteristics of the internal shear stress are reproduced in the simulation results. The studies have shown that the variation of the friction angle has a major impact on the formal features of shear stress-displacement curves.