基于能量耗散与释放原理的岩石强度与整体破坏准则

讨论了岩石变形破坏过程中能量耗散、能量释放与岩石强度和整体破坏的内在联系。指出岩石变形破坏是能量耗散与能量释放的综合结果。能量耗散使岩石产生损伤,并导致岩性劣化和强度丧失;能量释放则是引发岩石整体突然破坏的内在原因。定义了单元耗散能、可释放应变能、强度丧失和整体破坏的概念。给出了基于能量耗散的强度丧失准则和基于可释放应变能的整体破坏准则,分析了各种应力状态下岩石单元整体破坏的临界应力。并应用上述准则讨论了隧洞围岩发生整体破坏的临界条件。

CRITERIA FOR STRENGTH AND STRUCTURAL FAILURE OF ROCKS BASED ON ENERGY DISSIPATION AND ENERGY RELEASE PRINCIPLES

The intrinsic relations between energy dissipation,energy release,and strength and abrupt structural failure of rocks during failure process are discussed.It is emphasized that the failure of rock is a process in which energy dissipation and energy release occur simultaneously.The energy,part of work done by external forces,dissipates to produce damage and irreversible deformation inside rock and makes the material deteriorate and its strength drop down eventually.The strain energy released in rock volume plays the pivotal role of abrupt structural failure of rock.The concepts of energy dissipation,energy release,strength loss and abrupt structural failure of rock are defined.On the basis of these concepts,the criteria for strength and abrupt structural failure of rock are proposed.The critical stresses at the time of abrupt structural failure of rock under various stress states can be determined by these principles.The energy criteria have been applied to analyzing the failure condition of surrounding rock masses of a circular tunnel in practice.