The imitational parameters are different for loading section and unloading section of the fine-sandstone deformation curve at the same circulate curve under the same deformation-rate and stress-level.

在相同位移速率和相同载荷水平条件下，同一次循环时岩石变形曲线的加载段与卸载段的相应拟合参数值不同。

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Thus, the degree of nonlinear creep for fine sandstone specimen increases along with loading stress with obvious stress effect.

所以细砂岩试样的非线性蠕变程度随加载应力水平的提高而提高，载荷效应明显。

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The thermal cracking threshold of fine sandstone was determined with the change of temperature.

结果表明随着温度变化，细砂岩存在热破裂阀值。

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