脆性岩石微裂纹压密段本构模型研究

为准确掌握脆性岩石在荷载作用下的应力-应变关系，从岩石单裂隙出发，引入自然应变的概念，建立了物理意义明确的脆性岩石微裂纹压密段本构模型，并将其简化后与线弹性阶段的本构模型进行统一。通过热-力耦合室内试验确定了模型参数，试验结果验证表明:模型能够描述不同热处理温度、不同围压下花岗岩的压密段、线弹性段试验结果，对于脆性岩石的高温劣化性和围压对压密段的抑制作用也有很好的呈现，对深入掌握脆性岩石的强度规律具有一定的指导意义。

Research on constitutive model of microcrack compaction section in brittle rock

In order to accurately grasp the stress-strain relationship of brittle rock under load, the concept of natural strain was introduced from the single fracture of rock, and a constitutive model of microcrack compaction section in brittle rock with the clear physical meaning was established. Furthermore, the model was simplified and unified with the constitutive model of linear elastic stage. The model parameters were determined by the thermal-mechanical coupling tests in laboratory. The results showed that the model can well describe the test results of the compression section and the linear elastic section for granite under different heat treatment temperature and confining pressure, and can also well present the high temperature degradation of brittle rock and the inhibition effect of confining pressure on the compaction section. Therefore, this model has a certain guiding significance for the in-depth understanding on the strength laws of brittle rock.