摘要
通过大量煤岩力学物理性质的测试与分析 ,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物理性质差异较大 ,因而应将煤岩视为正交各向异性体或横观各向同性体来处理。运用 Griffith等有关脆性断裂理论 ,试验和研究了煤岩单轴压应力状态下的脆性断裂过程。
It is proved that the coal rocks in test areas have comparatively low elasticity modulus, high Poisson's ratio, high fragility and are easy to be broken & compressed through a great deal of tests for mechanical properties of coal rocks. Furthermore mechanical properties of coal rocks between parallel to its bed and perpendicular to its bed are much different and so the coal rocks should be regarded as perpendicular anisotropic body or parallel isotropic body. Brittle fracture of coal rocks in uniaxial compressive stress is studied by use of Griffith criterion of brittle.
出处
《石油钻探技术》
CAS
北大核心
2000年第3期10-13,共4页
Petroleum Drilling Techniques
关键词
煤层
岩石力学
水力压裂
煤层气井
coal bed,rock mechanics,physical property,hydraulic fracturing,isotropy,anisotropy,structural feature,fracture geometry,tensile strength,fracture,fracturing pressure
