中文摘要：

对4种不同倾角组合煤岩体进行了试验和数值模拟研究,获得了单轴和三轴压缩条件下组合煤岩体的宏观破坏机制,并分析了煤岩组合体中煤、岩不同倾角交界面对煤岩组合体整体变形破坏的影响。研究表明,单轴荷载条件下煤岩组合体的破坏强度随着组合倾角的增加而出现先微小减小,而后迅速减小;同种倾角条件下,煤岩组合体的破坏强度随着围压的升高而逐渐升高,并且煤岩组合体的倾角越小,破坏强度升高的速率越慢,而倾角越大,升高的速率越快,可见围压对于大倾角裂隙的抑制作用更明显。通过三轴试验获得了煤岩组合体整体结构的黏聚力和内摩擦角,其中组合体黏聚力随着倾角的增加而逐渐减小,但内摩擦角变化规律不明显。通过扩展有限元对试验结果进行了模拟验证,发现随着倾角由0°增加到60°,外力功、屈服应力和弹性应变能都在下降,当倾角超过45°～50°后,外力功和屈服应力将与弹性应变能出现背离,这是煤岩组合体的变形破坏机制由剪切变形机制逐渐转化为界面滑移破坏机制重要标志。

英文摘要：

Experimental and numerical simulation researches on the strength property and failure mechanism of different inclined angles coal-rock combination bodies have been carried out.The macro-failure mechanism of coal-rock combination bodies has been obtained.And the effect of the interface between coal and rock has also been analyzed in detail.The uniaxial experimental results indicate that the failure strength of coal-rock combination bodies decreases slowly at first and then rapidly with the increasing of combination inclined angle.For the same inclined angle for coal-rock combination bodies,the whole failure strength increases with the increasing of the confining pressure.In addition,the smaller the combination inclined angle,the smaller the increasing rate of the failure strength;the bigger the combination inclined angle,the bigger the increasing rate of the failure strength.Therefore,the effect of the confining pressure on the large inclined angle of the coal-rock combination body is obvious.The cohesion and internal friction angle of coal-rock combination bodies have also been obtained through the triaxial experiments.The cohesion of combination bodies decreases with the increasing of the inclined angle.However,there are no clearly relationship between the internal friction angle and the inclined angle.The extended finite element method（XFEM） has been applied to simulate the failure of different inclined angles combination bodies.The simulation results from inclined angle 0° to 60°,of which the interval 5° indicate that external force work,yield stress and elastic strain energy decease with the increasing of the inclined angles.However,when the inclined angles are more than 45-50°,the external force work and the yield stress will change inversely with the elastic strain energy.This is an important symbol of failure mechanism changing from shear failure to slip failure mechanism for the coal-rock combined bodies.