基于块体单元法的砌块介质变形数值模拟

Numerical Simulation of Block-brick Deformation by Block Element Method

基于块体单元法,在块体的位移模式中考虑块体单元的刚体位移、常应变及弯曲曲率,编制了平面块体单元法的程序.数值模拟结果表明,此法能显著提高块体单元法的位移和应力精度,为模拟层状介质如层状岩体的变形,尤其是弯曲变形提供了参考.此外,在块体的接触面内引入材料的非线性来模拟介质沿接触面的屈服或开裂破坏,并通过砌块墙体的破坏模拟算例验证了方法的可行性和可靠性.

Besides rigid displacement and constant strain of block element,the bending curvature is taken into consideration in block deformation model.According to that model,the plane block element method program is developed.And the consequences of numerical simulation show that the method can clearly heighten the accuracy of block element displacement and stress.Consequently,the model will offer an excellent solution in order to simulate deformation of the layered structure as the layered rock mass.What is more,the paper introduces the method to simulate the structure interface destruction way as yield and crack through the introduction the materials nonlinearity in the interface of block.In the paper,a validation example of block brick wall is given and the results of damage simulation validate the feasibility and reliability of the method.