国家自然科学基金面上资助项目（51474040）；四川省教育厅重点科研资助项目（15ZA0304）；宜宾学院博士科研启动金资助项目（2012B18）；宜宾市科学技术局重点科研资助项目（2014SF032）；煤矿灾害动力学与控制国家重点实验室访问学者基金资助项目（2011DA105287-FW201406）。
采用RLW-2 000 M微机控制煤岩流变仪，以砂岩为研究对象，重点分析单轴压缩条件下水压应变水压体积曲线演化规律，从水压、应变和水压体积三者关系反映水力压裂过程的力学特征；结合断裂力学观点分析了砂岩的水力压裂裂缝形态及破坏类型。实验结果表明：岩石在水力压裂过程的变形演化规律可分为4个阶段，揭示了孔隙裂隙的注水阶段、弹性变形阶段、体积膨胀阶段和贯通破裂阶段的特征；利用乘幂负指数拟合方程，能较好地模拟ε1-t与P-Vp曲线演化规律且精度较高；裂缝起裂和裂缝扩展延伸过程存在拉伸变形和剪切变形的相互作用。
In this paper, mechanical characteristics of sandstone under hydraulic fracturing were investigated by uniaxial compression tests (using RLW-2000M Coal and Rock Computer Controlled Rheological Testing Machine). Transformation laws of strain-pore water pressure curves are the research highlights. The mechanical characters of sandstone under hydraulic fracturing were discussed based on pore water pressure, rock strain and water volume. In addition, we assessed the hydraulic fracture morphology and failure type of sandstone. The results show that the typical deformation evolution involoves four stages in hydraulic fracturing process, and well the characteristics of the pore fissure water injection stage, the elastic deformation stage, the volume expansion stage, and the gloable rupture stage are revealed. The power of negative exponential can fit the ε1-t and the P-Vp curves. Tensile deformation and shear deformation interact with each other during the crack initiation and propagation process.
杨红伟,许江,聂闻,林骏,龚涛.单轴压缩砂岩水力压裂力学特性试验研究[J].重庆大学学报,2016,39(5):90-96.
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