围压对冻结粉土在振动荷载作用下蠕变性能的影响

Effect of Confine Pressure on Creep Behaviour of Frozen Silt under Dynamic Loading

对冻结粉土在不同围压下进行了振动蠕变试验,振动频率为5Hz,试样温度为-5℃试验发现蠕变破坏时间及最小蠕变率随围压的变化具有极值,并据此提出了最大强度临界围压的概念,而破坏应变则与围压基本无关,其蠕变破坏准则与静载下的破坏准则具有相同形式。

Creep tests were conducted on frozen silt (loess) under dynamic loading with the frequency of 5Hz at -5℃. It is found that the variations of the time to failure and minimum creep rate with confine pressure have maximum and minimum values. Based on this fact, the concept of critical confine pressure correspondig to the maximum strength was proposed. The failure criterion of frozen soil under dynamic loading has the same form with that under static loading.