煤岩力学性质测试分析与应用

THE MEASUREMENT AND ANALYSIS AND APPLICATION ON THE MECHANICAL PROPERTY OF COAL SEAM

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。

According to a lot of tests on the mechanical property of coal sample for measurement and analysis, the paper proves that it is lower elastic modulus, higher Poisson’s ratio, brittleness, and being easy of compression of coal seams in the test rgion, and it is obvious that the mechanical property between the direction of vertical and parallet bedding to make a great difference, then we must operate about the coal seam as isotropic in tranverse review. The authors apply Griffith’s brittle frature theory etc. to test and research the process of brittle fracture in the state of stress at single axial pressure of coal seam. The paper makes analysis qualitatively for character of gorwing crack by hydraulic fracture. It also proposes some improtant and valuable suggestion about hydraulic fracture design and operations.