岩石类材料的峰后力学行为一直是岩石力学研究领域的重点,也是难点之一。为了充分了解破裂岩石本身的自稳性能,本文首先采用室内三轴试验,得到了某大型地下水封洞库工程库址区现场花岗片麻岩的弹性模量为29.3Gpa,泊松比为0.25;同时分析了在不同围压条件下花岗岩峰值强度随着围压增加呈非线性变化,而随着围压增加,花岗岩残余强度逐渐增大且提高幅度较大;最后分析了洞室围岩与支护相互作用机理。试验结果可反映深部地下工程围岩在不同支护所形成的结构性约束条件下的承载能力和稳定性。 The post-peak mechanical behavior of rock-like materials has been the focus of rock mechanics research field, but also one of the difficulties. In order to fully understand the self-stability of the ruptured rock itself, this paper first uses the indoor triaxial test to get the elastic modulus of the granite gneiss in the site of a large-scale underground water seal cavern project site is 29.3Gpa and the Poisson’s ratio is 0.25 The peak intensity of granite under different confining pressure is analyzed to change non-linearly with the increase of confining pressure. As the confining pressure increases, the residual strength of granite increases and increases greatly. Finally, Support interaction mechanism. The test results can reflect the bearing capacity and stability of the surrounding rock in deep underground engineering under the structural constraints formed by different supports.