灌浆充填裂隙对煤岩强度及破坏模式的影响
Influence of grout-filled flaws on strength properties and fracture modes of coal petrography
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摘要: 为了探究灌浆充填裂隙对煤岩强度及破坏模式的影响,基于室内充填裂隙岩样的测试结果,借助颗粒流平行黏结模型进行一系列模拟研究。结果表明:随着岩桥角度增加,砂岩峰值应力与其对应的峰值应变均呈现出先降低后增加的趋势;此外,随着裂隙倾角增加,同一岩桥角度下裂隙煤岩的应变能和滑移摩擦能均有不同程度的增加;试样的破坏模式主要为拉伸破坏、剪切破坏以及拉剪混合破坏等。Abstract: In order to study the influence of grout-filled flaws on strength and fracture modes of coal petrography, based on the test results of indoor cracked rocks, the fractured rock containing different geometric arrangements were investigated experimentally using the parallel particle flow model. The results show that the peak stress and peak strain of cracked sandstone decrease first and then increase with the increase of ligament angle. In addition, with the increase of the flaw inclination angle, the strain energy and slip friction energy of the fractured rock increase to some extent under the same ligament angle. The failure mode of the specimen mainly includes tensile failure, shear failure and tensile-shear mixture failure.
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