板岩各向异性蠕变特性试验研究

发布时间：2018-02-24 10:46

  本文关键词： 板岩 蠕变 各向异性 层理面倾角　出处：《中南大学学报(自然科学版)》2017年08期 　论文类型：期刊论文

【摘要】：利用RYL-600微机控制岩石剪切流变仪,对江西九江地区典型板岩进行单轴压缩蠕变试验,研究板岩内部固有各向异性对蠕变特性的影响。研究结果表明:板岩试样蠕变曲线均出现明显的瞬时弹性阶段、衰减蠕变阶段和稳态蠕变阶段,并未出现加速蠕变阶段,且试样在应力水平稳定的状态下突然发生破坏,表现出明显的脆性破坏特征;随着层理面倾角变化,蠕变破坏类型即剪切破坏和张拉破坏也发生变化;在初始应力水平下,层理面倾角为60°时的瞬时弹性应变最大,倾角为90°时的瞬时弹性应变最小,且随着应力水平大,瞬时弹性模量逐渐上升并趋于稳定,瞬时弹性应变则呈逐渐降低的趋势;蠕变速率随应力水平提高而逐渐增大,层理面倾角为60°的试样在高应力下出现最大蠕变速率。
[Abstract]:The uniaxial compression creep test of typical slate in Jiujiang area Jiangxi Province was carried out by using RYL-600 microcomputer controlled rock shear rheometer. The influence of inherent anisotropy in slate on creep characteristics is studied. The results show that the creep curves of slate samples have obvious instantaneous elastic stage, attenuation creep stage and steady creep stage, but no accelerated creep stage. Under the condition of stable stress level, the specimens suddenly fail, showing obvious brittle failure characteristics, and the creep failure types, i.e. shear failure and tensile failure, also change with the change of the inclined angle of the bedding plane, and at the initial stress level, the creep failure type also changes with the change of the bedding plane inclination angle, and at the initial stress level, the creep failure type also changes. The instantaneous elastic strain is the largest when the dip angle of the bedding plane is 60 掳, and the instantaneous elastic strain is the minimum when the dip angle is 90 掳, and the instantaneous elastic modulus increases gradually and tends to be stable with the large stress level, and the instantaneous elastic strain gradually decreases. The creep rate increases gradually with the increase of stress level, and the maximum creep rate appears at high stress for the specimen with a dip angle of 60 掳.
【作者单位】： 中南大学资源与安全工程学院;
【基金】：长江科学院开放研究基金资助项目(CKWV2016390/KY) 国家自然科学基金资助项目(51374246) 湖南省水利厅科技项目(30227) 中南大学硕士生自主探索创新项目(2016zzts453)~~
【分类号】：TU45
，

本文编号：1529949