【摘要】 本文对煤岩基本力学性质、煤层水压致裂裂缝形成条件、裂缝形态以及裂缝开裂角方位等基本理论进行了研究与探讨。通过大量煤岩力学性质测试,证实了试验区目的层煤岩弹性模量低,泊松比较高,脆性大,易破碎,易压缩。文章还得出了目的层煤岩Mohr断裂准则二次抛物线型包络线,煤层水压致裂裂缝形式判断,裂缝开裂角方位的计算公式以及有关结论。更多还原

【Abstract】 This paper deals with the research and discussion of the mechanical properties of coal, the condition of developing crack, the form of crack and the incipient crack angle by hydraulic fracture on the basis of the foundational theory. According to a lot of tests on the mechanical property measurement of coal, the paper proves that it is low elastic modulus, high Poisson’s ratio, being easy of brittle fracture and compression in the test region. The paper al-so obtains the formulas to draw the second power parabolic Mohr envelope, to decide the crack form of the coalbed from hydraulic fracture, to calculate the incipient crack angle and some related conclusions.更多还原