非贯通节理类岩石试件单轴压缩特性初探

针对嵌入式非贯通节理对岩体力学特性的影响规律,采用数字建模和3D打印技术建立了正弦型节理实体模型,制备了完整类岩石试件、含单节理类岩石试件及含双节理类岩石试件,单节理角度分别为30°、45°、60°,双节理角度分别为30°、45°,30°、60°,45°、60°。对各类试件进行了单轴压缩试验,结果表明：含节理类岩石试件的单轴抗压强度低于完整类岩石试件,且随着试件内部节理数量的增加,试件单轴抗压强度的降低幅度增大；单节理类岩石试件的破坏形式均为沿节理所在平面发生剪切破坏,试件的单轴抗压强度随节理角度的增大而增大,这主要是节理面切割度和节理面法向应力共同作用的结果；双节理类岩石试件破坏时内部裂隙发育、贯通程度较高,破坏后的试件非常破碎,基本不具残余强度。

Preliminary Study on Uniaxial Compressive Properties of Rock-like Specimen with Non-Consecutive Joints

In view of the influence of embedded non- consecutive joints on the mechanical properties of rock mass, the solid model of sinusoidal joints is established by using digital modeling and 3D printing technology. Complete rock-like specimens, rock-like specimens with single joints and rock-like specimens with double joints are prepared. The angles of single joints are 30 degrees, 45 degrees and 60 degrees respectively. The angles of double joints are 30 degrees, 45 degrees; 30 degrees, 60 degrees; and 45 degrees, 60 degrees respectively. Uniaxial compression tests were carried out on all kinds of specimens. The results show that the uniaxial compressive strength of rock-like specimens with joints is lower than that of complete rock-like specimens, and with the increase of the number of joints in the specimens, the decrease of uniaxial compressive strength of specimen increases. The failure modes of rock specimens with single joints are all along the plane where the joints are located, and the uniaxial compressive strength of the specimen increases with the increase of the joint angle due to the joint plane dissection degree and the normal stress on the joint plane. The cracks in the destroyed specimens with double joints develop and penetrate in a high degree. Therefore, the specimens after failure are very fragmented and have little residual strength.