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为研究注水对煤层破坏特性的影响,开展煤样单轴压缩试验,观察不同含水率预制裂纹型煤试件的能耗及破坏模式。结果表明:随着含水率的增加,煤样单轴抗压强度和弹性模量均以负指数函数方式下降;煤样积聚的总能量、存储的弹性能和破坏的耗散能均随含水率以二次抛物线递减函数方式减小;煤样中预制裂纹产生起裂点所需轴向应力和峰值应力随含水率逐渐减小;试样破坏形式随含水率由单一剪切破坏发展到拉伸破坏,然后剪切拉伸复合型破坏。
In order to study the influence of water injection on the failure characteristics of coal seam, uniaxial compression tests of coal samples were carried out to observe the energy consumption and failure modes of precast cracked briquette samples with different moisture contents. The results show that with the increase of water content, the uniaxial compressive strength and elastic modulus of coal sample decrease with the negative exponential function. The total energy accumulated, the elastic energy stored and the dissipative energy of failure depend on the moisture content And decreases with the quadratic parabolic decreasing function. The axial stress and peak stress required for initiation and cracking of prefabricated cracks in coal samples gradually decrease with the water cut-off rate. The failure modes of samples develop from single shear failure to extensibility Vandalism, and then shear the composite damage.