不同密度、不同加载方式、循环加卸载下做了实验，进行了详细地分析与总结。
Som experiments, diversity loading ways and diversity density and cycle loading, are done in this paper.
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。
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.
同一循环中的加载与卸载曲线基本不重合，且多数情况不形成闭合环路；
The loading curves of coal-rock combination body are usually not coincidence with the unloading curves. In addition, they usually do not form a closed loop.
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