Deformation rate analysis utilizes deformation memory effect (DME) that is one of the fundamental properties of rock, to estimate in situ stress underground. It could be influenced by the stress history which has been subjected to in the past. To understand the influence under the cyclic loading path, in the experimental study, different stress levels were applied on sandstone samples and two types of granite samples. In the theoretical investigation, the sliding friction model consisting of multiple microstructure surfaces is considered in this paper. Both experiments and the theoretical model show that when the number of cyclic loading times keeps increasing, (1) the stress read at the DRA inflection is getting closer to the previously cyclic stress; (2) the angle at the DRA inflection becomes sharper, which gives clearer inflection point; and (3) the strain differential amplitude in the DRA curve gradually decreases and then toward a stable value. An upper limit exists for influence, indicating that the best cyclic loading times occur when the pulse amplitude of the strain differential stops changing. It is confirmed that the multiple cyclic loading method provides a better outcome for experiment using artificial preload when DME is utilized for stress reconstruction. Without other factors disturbing, the memory information of the in situ stress would hardly lose under the history of cyclic loading.

中文翻译：

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循环加载路径对岩石变形记忆效应的影响

变形率分析利用变形记忆效应 (DME) 作为岩石的基本特性之一，来估计地下的原位应力。它可能会受到过去承受的压力历史的影响。为了了解循环加载路径下的影响，在实验研究中，对砂岩样品和两种类型的花岗岩样品施加了不同的应力水平。在理论研究中，本文考虑了由多个微结构表面组成的滑动摩擦模型。实验和理论模型都表明，当循环加载次数不断增加时，（1）DRA 拐点处的应力读数越来越接近先前的循环应力；(2)DRA拐点处的角度变得更锐利，从而给出更清晰的拐点；(3) DRA 曲线中的应变微分幅值逐渐减小，然后趋于稳定值。存在影响的上限，表明当应变微分的脉冲幅度停止变化时出现最佳循环加载时间。经证实，当 DME 用于应力重建时，多循环加载方法为使用人工预加载的实验提供了更好的结果。在没有其他因素干扰的情况下，地应力的记忆信息在循环载荷历史下几乎不会丢失。经证实，当 DME 用于应力重建时，多循环加载方法为使用人工预加载的实验提供了更好的结果。在没有其他因素干扰的情况下，地应力的记忆信息在循环载荷历史下几乎不会丢失。经证实，当 DME 用于应力重建时，多循环加载方法为使用人工预加载的实验提供了更好的结果。在没有其他因素干扰的情况下，地应力的记忆信息在循环载荷历史下几乎不会丢失。