真三轴载荷下不同煤岩比例组合体力学响应研究
Mechanical response of coal rock mass with different proportions under true triaxial load
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摘要: 为探究真三轴载荷下不同煤岩比例组合体力学响应规律，制备不同组合方式立方体试件，以现场实测应力演化为真三轴加载路径，探究不同煤岩比例组合体在该应力路径下的力学响应及变形特征，并增加纯煤、岩样试件作为参照进行对比分析。结果表明：在真三载荷下煤、岩试样强度、弹性模量及抗变形能力较单轴压缩均有显著提高；煤岩组合体力学参数与峰值应变介于煤样与砂岩样之间，试件强度和弹性模量与煤层占比负相关，但随着煤层厚度增加，二者减小趋势并不相同，弹性模量随煤层厚度增加近乎等比例减小，而强度随煤层厚度增加而降低的速率逐渐减小；同时发现，由于煤的非均质性较砂岩更加突出，不同组合方式力学参数组内离散性与煤层占比正相关；峰值应变随煤层厚度增加并非单调变化，三元组合方式峰值应变大于二元组合体；在三轴载荷下，煤-岩与岩-煤2种组合方式试件力学参量与变形特征相差极小，认为由煤岩材料非均质性造成。Abstract: In order to explore the mechanical response law of different coal rock proportion combinations under true triaxial load, the cube specimens with different combination methods were prepared. The true triaxial test was carried out with the field measured stress evolution as the loading path to explore the mechanical response and deformation characteristics of different coal rock proportion combinations under the stress path, and the pure coal and rock samples were added as the reference for comparative analysis. The results show that the strength, elastic modulus and deformation resistance of coal and rock samples under true triaxial compression are significantly higher than those under uniaxial compression. The mechanical parameters and peak strain of coal rock combination are between coal sample and sandstone sample, and the strength and elastic modulus of specimen are negatively correlated with the proportion of coal thickness. However, with the increase of coal seam thickness, the decreasing trend of the two is not the same. The elastic modulus decreases almost in equal proportion with the increase of coal seam thickness, while the decreasing rate of strength with the increase of coal seam thickness gradually decreases. The reason is that the heterogeneity of coal is more prominent than that of sandstone. The peak strain does not change monotonously with the increase of coal seam thickness. The peak strain of ternary combination is larger than that of binary combination. Under triaxial loading, the difference between mechanical parameters and deformation characteristics of coal rock and rock coal composite specimens is very small, which is considered to be caused by the heterogeneity of coal rock material.
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