基于一系列不同围压、不同含水率条件下的冻结砂土的三轴压缩试验，在一个宽泛的含水率范围内，研究了围压与含水率对冻结砂土破坏应变能密度的影响特性。试验结果表明：含水率为30.6%的冻土试样容易发生塑性破坏，其他含水率的冻土试样容易发生脆性破坏。围压对破坏应变能密度的影响可以分为低围压阶段、中围压阶段、高围压阶段，并且含水率对临界围压有重要影响。含水率对破坏应变能密度的影响也可以分为两种类型：当围压较低时（50 kPa），随着含水率的增大，破坏应变能密度有一个初始增加的阶段，在含水率约为30.6%时破坏应变能密度达到最大值600 kPa，之后随着含水率的继续增大，破坏应变能密度转而减小，达到60 kPa后含水率的进一步增大不再影响破坏应变能密度，即此时冻土的破坏应变能密度接近于冰的破坏应变能密度；当围压较高时（大于等于500 kPa），与低围压阶段相比，破坏应变能密度没有初始增加的阶段。

Effects of confining pressure and water content on failure strain energy density of frozen silty sand are investigated in a comprehensive experimental program of triaxial compressive test under the condition of various confining pressures and a wide range of water content. The results show that when the water content is about 30.6%, the frozen soil is prone to plastic failure, while brittle failure occurs at other water contents. The influence of confining pressure on failure strain energy density can be divided into low confining pressures phase, medium confining pressures phase and high confining phase. And water content has an important effect on the boundary confining pressure. Two types of the effect of water content on failure strain energy density are observed. When confining pressure is low (50 kPa), failure strain energy density begins to increase with increasing the water content, and reaches a maximum (600 kPa) at water content of 30.6%. Then, as the water content continues to increase, the damage energy density decreases. When the water content reaches 60 kPa, the further increase of the water content no longer affects the damage energy density, i.e., the damage energy density of the frozen soil is close to that of the ice. When the confining pressure is high (≥ 500 kPa), there is no initial increase in the failure strain energy density compared to the low confining pressure stage.