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应用了胡少斌博士建立的含瓦斯煤体力学特性测试系统,进行了含瓦斯煤全应力-应变实验和含瓦斯煤吸附膨胀实验。实验结果表明,在有效围压一定的条件下,含瓦斯煤体的力学特性的影响与其瓦斯压力有关,瓦斯压力越大,煤体的弹性模量越低,抗压强度越低,抵抗变形的能力越弱;煤体中冲入吸附性越强的气体,对煤体力学特性影响越大,煤体抵抗变形的能力越弱;在固定轴向载荷和有效围压的条件下,煤体内瓦斯压力越大,煤体膨胀变形的速率越快,并且达到最终破坏的形变量也越小;吸附瓦斯和游离瓦斯的存在加速了裂纹劈裂破坏,使煤体更容易发生剪切滑移破坏。
The test system of methane-containing coal mechanics, established by Dr. Hu Shaobin, was applied to conduct the full stress-strain experiment of gas coal and the experiments of adsorption and expansion of gas containing coal gas. The experimental results show that under the condition of effective confining pressure, the influence of the mechanical properties of gas containing coal is related to the gas pressure. The larger the gas pressure, the lower the elastic modulus of coal, the lower the compressive strength and the resistance to deformation The weaker the ability; coal into the stronger adsorption of gas, the greater the impact on the mechanical properties of coal, coal resistance to deformation weaker capacity; fixed axial load and effective confining pressure conditions, the coal inside the gas The greater the pressure, the faster the rate of expansion and deformation of coal, and the smaller the amount of deformation to achieve the final destruction; the presence of adsorbed gas and free gas accelerated the crack splitting and destruction, and the coal is more prone to shear and slip damage.