在以下三种应力途径实验中,研究了济南辉长岩和房山花岗岩的强度和体积膨胀:A型——增加最大主应力σ_1使岩石破坏;B型—从某一应力状态开始,保持σ_1不变而减小围压,直至岩石破坏;C型——保持σ_1不变增加围压,这时岩石不发生破坏,结果表明,岩石强度与体积膨胀及应力途径有关,在一定条件下,B型实验岩石强度较A型为低,与A型实验中岩石的体积膨胀相比较,B型实验中岩石处于一种过密状态,而在C型实验中处于一种超膨胀状态。 In the following three stress path experiments, the strength and volume expansion of the gabbro and Fangshan granites in Jinan were studied: Type A - increase the maximum principal stress σ_1 to destroy the rock; Type B - maintain a σ_1 from a stress state And the confining pressure is reduced until the rock is damaged. Type C - maintaining constant σ_1 increases confining pressure, and the rock is not damaged at this moment. The results show that the strength of rock is related to volume expansion and stress path. Under certain conditions, Type B The strength of experimental rock is lower than that of type A, and compared with the volumetric expansion of rock in type A, the rock in type B is in an over-dense state, while in type C it is in a super-expanded state.