岩体低温动态力学性能研究是低温岩体工程动态破坏机理和安全性分析的基础。本项目首先采用冲击试验研究裂隙岩体和节理的低温非线性动态力学行为，并建立相应的本构模型，分析温度、动载、含水率等多种耦合因素对裂隙岩体和节理低温非线性动态力学行为的影响；其次，改进等效连续介质模型考虑裂隙岩体的低温非线性动态力学行为，改进位移不连续模型考虑节理的低温非线性动态力学行为，以此建立节理裂隙共存时低温岩体中波传播分析力学模型，分析多种耦合因素对节理裂隙岩体低温动态力学响应的影响；在此基础上，建立岩体动态力学性能的低温劣化模型，分析岩体动态力学性能的低温劣化规律，揭示温度、动载、含水率等多种耦合因素对岩体动态力学性能低温劣化的影响。

The investigation of dynamic behavior of frozen rock mass is of extreme importance for dynamic analysis of frozen rock mass structures, such as feasibility analysis and safety assessment. Firstly, the proposed project performs series of dynamic tests to investigate the nonlinear mechanical behavior of micro-crack and macro-joint under low temperature. The corresponding nonlinear constitutive relations are proposed to investigate the thermo-hydro-mechanical coupling effects on the dynamic behavior of frozen micro-cracked rocks and macro-joints. Secondly, the equivalent medium model and the displacement discontinuity model are modified to consider the nonlinear behavior of frozen micro-cracked rock and macro-joint, respectively. A wave propagation method is derived to investigate the thermo-hydro-mechanical coupling effects on the dynamic response of frozen rock mass with co-existence of micro-cracks and macro-joints. Finally, a dynamic behavior deterioration model of frozen rock mass is proposed and the thermo-hydro-mechanical coupling effects is systemically investigated.