岩石相似材料变形与强度特性及数值模拟研究

Deformation and Strength Characteristics and Numerical Simulation of Rock Similar Material

在岩石相似材料单轴压缩试验中,不同的材料配比和加载速率将直接影响到相似材料的变形与强度特性。在进行不同配比岩石相似材料模拟试验的基础上,详细分析了不同相似材料的配比与其变形和强度参数之间的相互关系,力图找到变形和强度均较适合滑坡模拟的相似材料;讨论了不同加载速率对相似材料变形与强度的影响,并利用FLAC3D软件应变硬化—软化模型进行了岩石相似材料试样剪切软化的对比模拟研究。研究结果表明,加载速率在某一合理范围内变形模量和单轴抗压强度的试验结果是合理的,一旦加载速率过大就会导致试验结果产生较大的偏差;利用FLAC3D应变硬化-软化模型可以较好地进行单轴压缩试验模拟,剪切破裂特征的模拟结果与实际情况十分吻合。

During the rock similar material uniaxial compressive test, the deformation and strengthen character were directly affected by different material proportion and loading rate. This paper analyses the relationship between different material proportions and deformation and strength based on such test to find the similar materials suitable for landslide simulation. It also discusses the effect of the deformation and strength of similar materials under different loading rate and makes a contrast simulation of shear softening for rock similar material by FLAC^3D software with strain hardening-softening model. The study indicates that the test results of deformation modulus and uniaxial compressive strength are reasonable only when the loading rate is within a certain range, and they will have a greater deviation when the loading rate is too fast. It is concluded that it is appropriate to conduct the uniaxial compressive test by FLAC^3D software with strain hardening-softening model, and the simulation results of shearing rupture character coincide with actual situation.