Micromechanics numerical simulation of rock failure process under compression condition
Micromechanics and macromechanics of rock failure process was studied by many researchers, the macromechanics failure performance of rock is controlled by internal micromechanics changes, resulting in the rock failure form very different under different stress conditions, so that the macromechanics and micromechanics mechanism of rock failure process is very complicated. According to the rock failure process problem, from the internal micromechanics point of view, that there are a lot of internal micro-cracks in the rock, when the external load to meet certain conditions, these micro-cracks will be extended, the extended of micro-cracks leading to the rock physics changes in mechanical properties, where caused the decrease of rock elastic constants. The continued effect of the external load, the extended of internal micro-cracks will constantly growing, when the accumulation of such changes to a certain value, the macro failure of rock will happened.In order to simulate the micromechanics of rock failure process, finite element method is used for numerical simulation. Considered the rock as homogeneous materials, the initial elastic constants of every calculation elements is same, but the micro-cracks distribution of each element are not the same, subject to some statistical distribution. In the loading process, because each element of the internal micro-cracks distribution are not the same, and the stress-strain of the elements is different too, will result in the extended of micro-cracks in each element are different. Since the extended of micro-cracks in each element will lead to the reduction of its elastic constants, so a different micro-crack growth of each element will lead to changes in elastic constants inconsistent, in the continuing effect of external load, this elements internal micro-crack growth inconsistent will be ultimately reflected in the form of rock macro failure. For the macrostress-strain of rock failure process, the micro-cracks extended should reflect in the rock macro mechanics changed, that is, the entended of micro-cracks in each element effect on the rock macro mechanical properties, where the damage variables and effective elastic constants are used to reflect the rock failure process, so that the micromechanics and macromechanics in the rock failure process are combined together.
J.W.Zhou X.G.Yang J.K.Chen Z.H.Yang L.Zhang
State Key Laboratory of Hydropower and Mountain River Engineering,Sichuan University,Chengdu,610065 School of Engineering,University of Alaska Anchorage,Anchorage,99508 USA
国际会议
南京
英文
1-2
2009-10-18（万方平台首次上网日期，不代表论文的发表时间）