摘要
基于岩石内部裂隙和孔隙分布的随机性,运用连续损伤力学理论,建立了围压与轴压共同作用下岩石的统计损伤模型;结合岩石应力应变曲线的特征参量确定了模型参数,增强了模型的适应性;探讨了岩石损伤的演化性态及其宏观表现,并通过试验对模型进行了验证.结果表明:岩石的宏观力学特性取决于内部微裂纹的细观力学响应,其损伤演化途径反映了岩石变形破坏的全过程;模型理论曲线与试验实测曲线具有较高的吻合度,验证了模型的合理性.
Firstly,using the continum damage mechanics theory,the statistical damage constitutive model of rocks under the interaction of confining pressure and axial compression was established based on the randomness of the rock internal cracks and pore distribution.Secondly,the method for determining the model parameters was established by combing the characteristic parameters of rock stress-strain curve,which enhanced the adaptability of the model. Finally, the evolutionary path of the rock damage and its macroeconomic performance were investigated,and the model was verified by the test.The results show that the macro-mechanical properties of the rock depend on micromechanics response of the internal micro-cracks,its damage evolution approach reflects the whole process of rock deformation and failure.In addition the theoretical curve of model and the experimental measured curve has a high degree of matching which verify the rationality of the model.
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2014年第3期29-32,共4页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
国家自然科学基金资助项目(11172232
41272340)
陕西省自然科学基金资助项目(2011JM1003)
教育部新世纪人才支持计划项目(ACET-12-1044)
陕西省教育厅专项基金项目(11JK0525
11JK0542)
关键词
岩石
损伤演化
本构方程
模型参数
rock
damage evolution
constitutive equation
model parameter
