摘要
为探究地下水对深部岩体蠕变力学特性的影响,利用ZYSS2000岩石高温高压蠕变仪对饱水状态下的煤矿深部粉砂岩开展单轴压缩蠕变试验。试验结果表明,煤矿粉砂岩在各级应力作用下,轴向和侧向蠕变曲线较为相似,主要表现为减速蠕变和等速蠕变,其中减速蠕变段历时较短,等速蠕变段历时较长;体积蠕变曲线表现出压缩向扩容转化的特征;随应力的逐级增大,煤矿粉砂岩的瞬时应变、蠕变应变及稳态蠕变速率整体呈增长趋势,但应力的增大对煤矿粉砂岩侧向变形的影响比轴向变形要大;粉砂岩蠕变过程中的等时应力-应变曲线,表明粉砂岩侧向的时效变形与非线性特性较轴向更明显。
In order to investigate the influence of groundwater on creep properties of deep rock mass,a series of uniaxial compressive creep tests on Siltstone in coalmine under water-saturated condition were carried out by ZYSS2000 rock creep testing machine with high temperature and high pressure. Test results indicate the axial and lateral creep curves of Siltstone in coalmine were similar at different levels of stress,mainly showing as decelerating creep and steady-state creep. The time of decelerating creep stage was shorter,yet that of steady-state creep stage was longer. The characteristics of volumetric creep curve presented a transformation from compression to dilatancy. With the increase in stress gradually,the instantaneous strain,creep strain and steady creep rate of Siltstone in coalmine increased as a whole,yet the influence of stress on the lateral deformation of Siltstone in coalmine was larger than that on the axial deformation. In addition,the time-dependent deformation and nonlinearity of lateral creep of Siltstone in coalmine were more obvious than those of axial creep by analyzing the isochronous stress-strain curve.
作者
郁培阳
马芹永
YU Pei-yang;MA Qin-yong(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan Anhui 232001,China;Engineering Research Center of Mine Underground,Ministry of Education,Anhui University of Science and Technology,Huainan Anhui 232001,China)
出处
《安徽理工大学学报（自然科学版）》
CAS
2018年第3期24-28,共5页
Journal of Anhui University of Science and Technology:Natural Science
基金
国家自然科学基金资助项目(51774011)
矿山灾害预防控制省部共建国家重点实验室培育基地开放课题基金资助项目(MDPC201603)
