体积应变定义为物体单位体积的改变量，一般用θ 表示。当体积V增大或者缩小ΔV时，体积应变可用下式标示θ =ΔV/V
结果表明，非弹性体积应变与微裂纹数量直接相关。
It shows that unelastic volumetric strain is directly prepositional to the number of micro-cracks.
岩石基质渗透系数和孔隙率通过体积应变进行更新。
The permeability coefficient and porosity of rock are updated by volumetric strain.
积累损伤作为等效塑性应变、塑性体积应变和压力的函数。
The accumulated damage model is viewed as the function of equivalent plastic strain, plastic volumetric strain and pressure.
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