扩容角越大，剪切带最终可以获得越来越高的剪切应变和体积应变。
Higher DA results in higher values of shear strain and volumetric strain in shear band.
当扩容角较高时，应力峰值时试样内部的最大剪切应变增量较高，因而试样破坏的前兆比较明显。
Higher DA leads to higher value of maximum shear strain increment within the specimen. Therefore, more apparent precursor to failure can be observed at higher DA.
当差应力达到岩石的屈服应力时，扩容和非线性应变开始。此外，随应力水平的增加，扩容和非线性变形呈幂函数形式增加。
The volume dilatation and the non-linear deformation of rock originated, when the differential stress equals to the yield point of rock.
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