【摘要】 采用数字图像处理技术表征花岗岩的细观结构,利用基于数字图像的岩石破裂过程分析系统(RFPA-DIP)建立反映花岗岩内部矿物颗粒分布的数值模型,进行花岗岩压缩数值试验,分析花岗岩压缩荷载作用下破坏机理.研究结果表明,花岗岩非均匀的细观结构起着使试件内部产生了拉应力区的作用;单轴压缩荷载作用下,试件在细观层次上以拉伸破坏为主;中低围压条件下,试件表现为张拉破坏和剪切破坏相互耦合的破坏方式,而且破坏机制随围压的增大是不断变化的,剪切破坏逐渐成为主控破坏方式.更多还原

【Abstract】 Digital image processing technologies were applied to characterizing the heterogeneity of granite so as to incorporate it into rock failure process analysis code based on digital image processing,i.e.,RFPA-DIP,and a numerical model of granite was thus developed.The compression tests were carried out numerically to investigate granite failure mechanism at meso-level.The results show that the heterogeneity of rock results in the appearance of tensile stress zones.Under the condition of uniaxial compressive stress,the failure mechanism of granite at meso-level is mainly tensile failure,but under moderate or low confining pressures it is in tensile-shear coupled failure modes.The failure mechanism changes with increasing confining pressure,and shear failure mode gradually comes to mainly controlled mode.更多还原