Improvement of Quantitative Evaluation of Rock Brittleness Based on Stress-Strain Curve

Dongfeng JIANG, Tingting WANG, Wanchun ZHAO, Yanqiu CHEN, Yunpeng MA


Accurate assessment of brittle of rock is the key to the transformation of oil and gas reservoirs. In view of this, Therefore, through literature research, summarized more than 30 kinds of  brittleness index, and analysis the limitations of the brittleness evaluation index. A new brittle evaluation index, based on the stress characteristics of the stress-strain curve, and considering the two kinds of rock breaking behavior, is proposed. And carry out uniaxial compression test to verify the evaluation index of brittleness. The test results show that the new brittle index can evaluate the two kinds of rock brittleness, which is more general and reliable than other indexes. The results have important significance to enrich and improve the existing evaluation methods of rock brittleness.


Rock mechanics; Brittleness index; Stress-strain curve

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