煤岩动静力学参数关系试验研究

Experimental study on the relationship between dynamic and static mechanical parameters of coal

煤岩的动、静力学参数关系的试验研究,对研究煤岩的位移和变形特征及工程支护设计具有重要意义.将取自新河煤矿3 煤的煤样加工成Φ50 mm×100 mm 的圆柱体标准试件;采用500 kHz频率的纵横波换能器分别进行纵横波速度测试;在MTS815.03 电液伺服试验机上进行单轴压缩试验,得到静态弹性模量和泊松比.试验结果表明：煤岩动弹性模量与横波速度相关性强于与纵波速度的相关性,煤岩介质的纵波对孔隙和裂隙发育程度的敏感程度要比横波高;煤岩试件Ed/Es 比值主要集中在1.4-1.7,室内煤岩试件动、静弹性模量和动静泊松比之间存在较好的线性相关关系.

Experimental study on relationships between dynamic and static mechanical parameters of coals ishighly significant for study on displacement and deformation characteristics of coal and design of support project.Coal samples taken from the 3th seam in Xinhe mine are shaped into standardized cylinder samples （Φ50 mm×100 mm）.P-wave and s-wave velocities were measured using transducer with a frequency of 500 kHz. The uniaxial compressiontests were carried out on the MTS815.03 Electro-hydraulic servo-controlled testing machine to obtain thestatic elastic modulus and Poisson’s ratio. Experimental results showed that the correlativity between dynamicelastic modulus and s-wave velocity of coal is better than that with p-wave velocity. The ratio of Ed/Es is mainlydistributed between 1.4 and 1.7 in the tested samples. There is a good linear relationship between dynamic/staticelastic modulus and dynamic/static Poisson’s ratio in tested samples.