这个变形是随时间而缓慢变化的，这个缓慢变化的塑性变形就是蠕变变形。
The plastic deformation which is changed with time slowly is named room temperature creep.
由于外加的载荷随时间变化得很快，结构的变形也变化得很快，惯性力的作用将不可忽略。
The deformation of the structure changes very fast as the loads change with time. The effect of the inertia force can't be ignored.
岩体随时间产生的变形、锚索松驰、腐蚀、结构的不同等因素都将造成锚索预应力损失。
The load losses of the cable bolts are produced by the deformation of rock mass depending on time, corrosion and different kinds of structures etc.
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