单裂隙类岩石强度特性及蠕变模型的实验研究

采用相似材料制作出单裂隙类岩石试件,对单裂隙类岩石试件进行单轴、三轴实验研究。结果表明:(1)单裂隙类岩石试件在单轴压缩下,峰值强度随角度的增加而显著增强;(2)单裂隙类岩石试件在三轴作用下,由于围压作用,试件的峰值强度与单轴压缩的峰值强度呈现不同趋势。当在低围压状态下,峰值强度趋势和单轴压缩下相同;而在高围压状态下,45°裂隙试件的峰值强度最低。通过对比高低围压的应力应变曲线发现围压对45°裂隙的影响最大;(3)通过单裂隙试件的单轴、三轴和围压卸载实验,发现稳态蠕变率都具有相同的趋势:稳态蠕变率随角度的增加先增加后减小,完整试件的稳态蠕变率最低;(4)采用实验法对单裂隙试件的蠕变曲线进行拟合,提出一种适合单裂隙类岩石材料蠕变特性蠕变方程。

The study of single fracture rock strength characteristics and creep model by experiment

Through the single fracture rock that using similar materials containing crack producing rock specimen uniaxial and triaxial experiments, the result showed that: (1) The single fissure types of rock specimen under uniaxial compression, the peak intensity is significantly enhanced with the increase of Angle; (2) The single fissure types of rock specimens under the action of a three axis, due to the confining pressure effect, the peak intensity different with the trend of uniaxial compression strength of the specimens, under low confining pressure condition, the trend of peak intensity under uniaxial compression are the same,under high confining pressure state, with 45 degrees of fracture the lowest strength of the specimens, contrast the high and low confining pressure stress-strain curve that 45 degrees of fracture most be influenced; (3) single fracture specimen uniaxial and triaxial and confining pressure unloading experiment, found that the steady-state creep rate has the same trend: the steady-state creep rate with the increase of the Angle increases after the first decreases, and the complete specimen of steady-state creep rate are the lowest, (4) In this paper, the creep curve of a single slit specimen is fitted with the experiment method, and a creep equation is proposed for the creep property of a single crack type rock material.