预制非贯通单组裂隙岩石模型力学参数的实验研究

开展裂隙岩体破坏的力学特性的研究始终是岩体力学研究领域的重要课题，预制裂隙岩石模型是了解和掌握岩石破坏机理的一条重要途径，本文预置裂隙的水泥砂浆试块模拟节理发育的裂隙岩石，通过单轴压缩试验与剪切试验研究节理影响下的岩石力学参数的变化，并演示了裂隙的扩展贯通过程。研究表明：(1)岩体内部节理面的张开扩展延伸直至贯通从而引起非贯通节理岩体的破坏。(2)岩石模型的单轴抗压强度随着节理角度的增加逐渐下落，在节理角度达到45°时，试块的单轴抗压强度出现最小值，随后开始反向增大。(3)岩石模型单轴抗压强度与节理贯通率的关系满足一定的关系式，单轴抗压强度随着节理贯通率的增大而不断降低。(4)随着法向应力的增加，裂隙岩石模型的峰值剪应力也相应线性增大，当节理面存在充填物时会一定程度上会提高裂隙岩石的强度。这为裂隙岩石的破坏机理提供了重要的参考依据。

Research on Mechanical Parameters of Prefabricated Non Connected Single Group of Jointed Rock Mode

Study on the mechanical properties of fractured rock mass destruction is always an important issue in the field of rock mechanics research, prefabricated crack model of rock is to understand and grasp the rock failure mechanism is one of the important way.Preset cracks of cement mortar test block to simulate the joint development of fractured rock, through uniaxial compression test and shear test study the change of the rock mechanics parameters, under the influence of the joint and crack extending through the process is demonstrated. Research shows,(1)The expansion and extension of the joints in the inner surface of the rock mass can cause the destruction of the non-penetrating jointed rock mass. (2) The uniaxial compressive strength of the rock mode with the increase of joint Angle gradually falling, in the joint Angle to 45 °, the uniaxial compressive strength of the minimum value, then begin to reverse. (3)The relationship between the compressive strength and the joint rate of the rock uniaxial compressive strength is in a certain relationship, and the uniaxial compressive strength decreases with the increase of the joint rate. (4) With the increase of normal stress, the peak shear stress of fracture rock model increases linearly, and the strength of fissure rock will be improved to some extent when the joint surface is filled. This provides an important reference for the failure mechanism of fractured rock.