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中文摘要：
通过对循环载荷条件下细粒砂岩在不同载荷水平、不同位移速率时的变形特性及其塑性滞回环演化规律的分析发现：1）循环载荷条件下岩石的加、卸载曲线不重合,将形成一封闭的塑性滞回环,该塑性滞回环从第2循环起将趋于稳定;2）不同载荷水平和不同位移速率下第1循环时的各拟合参数值与第2循环相比存在有较大变化,但从第2循环曲线起,各拟合参数均将逐渐趋于恒定;3）随着位移速率和载荷水平的变化,其拟合参数将随之而发生变化;4）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.
英文摘要：
The deformation characteristics and the plastic-loop and unloading condition at the three different deformation-rates and of the fine-sandstone is studied under the loading the two different stress-levels, the results show： 1 ） There is really the plastic-loop in the deformation curve for the loading deformation curve is different form the unloading deformation curve. But the plastic-loop is nearly unchangeable since the second circulate loading. 2） There is different for every imitational parameter between the first deformation curve and the second deformation curve at the different stress-levels and the different deformation-rates, but every imitational parameters become more and more invariable gradually since the second circulate curve. 3 ） With the change of the deformation-rates and stress-levels, the imitational parameters will change with it. 4） 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.
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