Numerical simulation of microstructure of brittle rock using a grain-breakable distinct element grain-based model

脆性 离散元法 极限抗拉强度 多孔性 材料科学 晶界 微观结构 岩土工程 断裂(地质) 开裂 压缩(物理) 地质学 剪切(地质) 压力(语言学) 复合材料 机械 物理 哲学 语言学
作者
Fuqiang Gao,Doug Stead,Davide Elmo
出处
期刊:Computers and Geotechnics [Elsevier BV]
卷期号:78: 203-217 被引量:144
标识
DOI:10.1016/j.compgeo.2016.05.019
摘要

A distinct element grain-based method (GBM) was developed to simulate the microstructure of rock-like materials. Using this method, a UDEC-GBM model can be readily constructed with a given mineral composition, allowing independent assignment of specific properties to both the grains and grain boundaries. Both intra-granular cracks cutting through the grains and inter-granular cracks developed along grain boundaries can be captured. These features allow a full incorporation of both geometric and mechanical heterogeneity at grain scale for simulating brittle rocks. The validity of the proposed UDEC-GBM approach was verified by simulating a low-porosity sandstone under compression and direct-shear tests. The UDEC-GBM was proved to be capable of reproducing many of the characteristics associated with brittle fracture in low-porosity sandstone. It was found that the model with unbreakable grains trends to under-estimate the crick initiation threshold, highlighting the importance of the incorporation of breakable grains when modeling micro-structure of brittle rocks. The numerical experiments suggested that examining the extent of the tensile stress zones alone may lead to a biased evaluation of tensile cracking at crack initiation. The tensile stress magnitude must also be taken into consideration. It was also found that a synthetic sandstone sample with relatively low ground boundary strength produces a more ductile post-peak behavior. Microscopic tensile strength of the grains has limited influence on the failure mechanism of the synthetic specimen under unconfined compression loading. The proposed GBM approach provides a very useful tool for studying grain-scale micro-mechanics of brittle rocks.
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