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通过大量煤岩力学性质的测试与分析 ,证实了试验区煤岩的弹性模量相对较低 ,泊松比较高 ,脆性大 ,易破碎 ,易压缩 ,且煤岩垂直层理方向上和平行层理方向上的力学性质相比差异较大 ,故而应将煤岩视为横观各向同性体来处理。运用Griffith断裂理论 ,试验和研究了煤岩的脆性断裂过程 ,针对煤岩结构构造和力学性质对水压致裂裂缝发育特点的影响做了定性分析 ,并对水力压裂设计与施工提出了有重要参考价值的建议。
Through a large number of tests and analysis on the mechanical properties of coal and rock, it is confirmed that the elastic modulus of coal and rock in the test area is relatively low, the Poisson’s ratio is relatively high, the brittleness is large, the crushing and compressing are easy, and the vertical and vertical coals The mechanical properties in the direction are quite different, therefore, the coal and rock should be treated as transverse isotropic body. The Griffith fracture theory is used to test and study the brittle fracture process of coal and rock. According to the qualitative and quantitative analysis of the influence of structure and mechanical properties of coal and rock on the development characteristics of hydraulic fracturing, the design and construction of hydraulic fracturing are proposed Important reference value advice.