保持加载下岩石变形记忆效应时效特征规律研究

doi:10.13722/j.cnki.jrme.2018.1491

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摘要作为岩石基本属性的变形记忆效应(deformation memory effect，DME)具有时效特性，加载保持时间(Tc)对岩石DME的影响是其时效特性之一。选用砂岩及2种花岗岩材料，开展不同Tc下的物理试验，对记忆信息形成精度及应变差幅值等进行分析，并基于岩石内部多微结构面间的黏弹性摩擦滑动理论，采用岩石三元件构建基本记忆单元理论模型，进行不同Tc下DME力学理论研究，结果表明：(1) 随Tc增加，2种花岗岩和砂岩的记忆信息形成精度明显提高，应变差幅值逐渐减小；(2) 记忆理论模型的记忆信息形成精度和应变差幅值的变化规律和物理试验保持一致，即基于多微结构面的记忆理论模型能够描述不同Tc下的岩石DME宏观行为；(3) Tc增加到一定幅度时，记忆信息形成精度和应变差幅值趋于不变，并提出当应变差幅值稳定时，此时为最佳Tc。结论给出了保持加载下岩石DME时效特性变化规律，为岩石DME时效性研究提供了试验及理论基础。

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	钟凌伟1
	2
	王海军2
	任旭华1
	汤雷2
	Ariel Hsieh3
	尹健民4
	李永松4

关键词 ：岩石力学, 岩石变形记忆效应, 变形率变化法, 时效性, 加载保持时间, 多微结构面, 摩擦滑动

Abstract：Deformation memory effect(DME)，as one of basic properties of rocks，has time features. The influence of the loading time(Tc) on DME is one of time effects. Sandstone and two kinds of granite materials were selected to carry out physical experiments under different Tc. The accuracy of memory formation and the magnitude of strain difference were analyzed. Based on the viscoelastic frictional sliding theory of multi-microstructural planes in rocks，a basic memory theoretical model was constructed by using three elements of rocks，and the DME mechanical theory under different Tc was studied. The results show that，with increasing Tc，the accuracy of memory formation of granite and sandstone is obviously improved and the amplitude of strain difference decreases gradually，and that both the accuracy of memory and the amplitude of strain difference tend to remain unchanged when Tc increases to a certain extent. It is put forward that Tc is the optimum creep time when the amplitude of strain difference keeps stable. The variations of the memory formation accuracy and the strain difference amplitude obtained from the proposed theoretical model are consistent with physical experiment results，which means the proposed model based on multi-microstructural planes can describe the macroscopic behaviors of rock DME under different Tc. The research provides an experimental and theoretical basis for the study of rock DME.

Key words： rock mechanics rock deformation memory effect deformation rate analysis time effect loading creep time multi- microstructures frictional sliding

引用本文:

钟凌伟1，2，王海军2，任旭华1，汤雷2，Ariel Hsieh3，尹健民4，李永松4. 保持加载下岩石变形记忆效应时效特征规律研究[J]. 岩石力学与工程学报, 2020, 39(2): 228-238.
ZHONG Lingwei1，2，WANG Haijun2，REN Xuhua1，TANG Lei2，Ariel Hsieh3，YIN Jianmin4，LI Yongsong4. Research on time features of rock deformation memory effect under creep loading. , 2020, 39(2): 228-238.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.1491 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I2/228

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