软岩非线性蠕变损伤模型及其试验研究

发布时间：2018-06-27 03:43

本文选题：蠕变 + 弹性模量　；参考：《水文地质工程地质》2017年03期

【摘要】：为了反映软岩蠕变全过程,进行红层泥岩蠕变力学试验,试验发现弹性模量随时间的增长而逐渐衰减,黏滞系数在应力恒定且并未达到屈服应力的情况下,随时间的增长而逐渐增大。因此认为传统理论流变力学中的蠕变损伤处理方法不适用于将黏滞系数进行损伤演化,故引入分数阶微积分来描述软岩蠕变的黏弹性和黏塑性应变。通过构建一个考虑蠕变时效损伤的弹性体,并将其与基于分数阶微积分的黏滞和黏塑性体进行串联,从而建立一个新的非线性蠕变损伤模型。依据红层泥岩和相关文献中冻结软岩及红砂岩的蠕变试验数据,通过该软岩蠕变损伤模型对其进行辨识,充分显示出所建模型的合理性和适用性。
[Abstract]:In order to reflect the whole creep process of soft rock, the creep mechanical test of red mudstone is carried out. It is found that the modulus of elasticity decreases gradually with the increase of time, and the viscosity coefficient is constant and does not reach the yield stress. It increases over time. Therefore, the traditional creep damage treatment method in rheological mechanics is not suitable for the damage evolution of viscosity coefficient, so fractional calculus is introduced to describe the viscoelastic and viscoplastic strain of soft rock creep. A new nonlinear creep damage model is established by constructing an elastic body considering creep aging damage and connecting it with viscous and viscoplastic bodies based on fractional calculus. According to the creep test data of frozen soft rock and red sandstone in red mudstone and related literature, the creep damage model of soft rock is identified, which fully shows the rationality and applicability of the model.
【作者单位】：成都理工大学地质灾害防治与地质环境保护国家重点实验室;
【基金】：国家自然科学基金项目资助(41372306)
【分类号】：TU458.3

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