循环加-卸载岩石本构模型研究

发布时间：2018-04-11 03:08

本文选题：循环加-卸载 + 岩石　；参考：《岩土力学》2015年12期

【摘要】：循环加-卸载岩石本构模型是预测压气储能洞室长期稳定性的关键,但目前还没有适用的本构模型,因此,提出了一种能够描述岩石循环加载和卸载的本构模型。鉴于岩石在循环作用下损伤不断累积,将基于Weibull分布的岩石损伤软化模型进行拓展,并用内变量疲劳本构模型描述每个循环的初始模量和卸载模量的变化,进而得到循环加-卸载作用下的岩石本构模型,然后将该模型与现有的试验结果进行对比。该模型物理意义明确,涉及的参数较少,且便于拟合。提出的循环加-卸载下岩石本构模型对试验数据拟合效果较好,能较准确地反映循环荷载上、下限值对应的轴向应变,也能反映出循环内部变形模量衰减的趋势。该模型的成功建立为循环加-卸载下岩石本构模型的研究提供了新思路。
[Abstract]:Cyclic load-unloading constitutive model is the key to predict the long-term stability of pressurized gas energy storage cavern, but there is no suitable constitutive model at present. Therefore, a constitutive model which can describe the cyclic loading and unloading of rock is proposed.In view of the cumulative damage of rock under cyclic action, the damage softening model based on Weibull distribution is extended, and the initial modulus and unloading modulus of each cycle are described by the internal variable fatigue constitutive model.Then the constitutive model of rock under cyclic loading and unloading is obtained, and then the model is compared with the existing experimental results.The physical meaning of the model is clear, the parameters involved are less, and the model is easy to fit.The proposed constitutive model of rock under cyclic loading and unloading has a good fitting effect on the experimental data, and can accurately reflect the axial strain corresponding to the lower limit value and the tendency of deformation modulus attenuation within the cyclic load.The successful establishment of the model provides a new idea for the study of rock constitutive model under cyclic loading and unloading.
【作者单位】：同济大学土木工程学院地下建筑与工程系;中国大唐集团新能源股份有限公司;
【基金】：国家自然科学基金资助(No.51278378) 国家高技术研究发展计划(863计划)项目(No.SS2012AA052501)~~
【分类号】：TU45

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