软岩非定常蠕变参数辨识

Testing Study on Creep Characteristic of Soft Rocks

岩石的流变特性是年岩石重要的力学特性之一,它控制着岩石的蠕变参数.某矿区岩石具有显著流变性,因此,矿区岩石蠕变规律研究成为一项重要的基础工作.为此,对矿区软弱复杂矿岩蠕变特性进行了试验研究.采用多级循环单轴压缩进行试验,在对试验数据深入分析时,考虑了加载历史对岩石试件变形的影响,真实地反映了岩石试件本身的流变力学行为.选取Burgers模型来反映岩石的蠕变特性,建立了一维情况下非定常粘弹性模型的蠕变方程,结果表明非定常粘弹性模型比定常粘弹性模型更为准确地反映了岩石的粘弹性变形性能.

Rheological characteristic is one of the most important mechanical characteristics of rock. It controls the creep deformation. Jinchuan mine rock has remarkable rheological characteristics. Therefore, the study on creep rule of the ore - rock at a mining region is an important base work. For this reason, a set of creep experiments was done to study the rheological characteristic of flabby and intricate ore - rock at that mine. It uses the various stepwise circular uniaxial compression creep test. In the process of data analysis, we take into consideration the influence of loading history on rock specimen deformation, and the result reflects truly the intrinsic rheological mechanical behaviors of rock specimen. Burgers creep model is adopted to reflect the characteristic of rock creep, and the one - dimensional and non - stationa- ry viscoelastic creep equation of rock is presented. The results show that non - stationary viscoelastic constitutive model more accurately reflects the deformation capability of rock than the constant one.