【摘要】 锚杆支护是地下岩体工程的主要支护方式之一。为了揭示锚固岩体在实际情况下的长期力学特性,文章对标准砂岩试件沿径向钻孔、张拉钢丝并施加预应力,通过室内单轴压缩蠕变试验,对锚固前后岩石的蠕变力学特性进行了研究。结果表明:锚固后岩石的力学性能产生了明显的改善,对径向变形的抑制效果更加显著;锚固后岩样轴向瞬时变形平均降低27%,径向瞬时变形降低60%,蠕变变形降低14%;根据岩样的变形特点,选用Burgers模型描述两种岩样的流变特性,并分析了流变模型参数的变化规律。更多还原

【Abstract】 Support with anchor bolts is one of the main supporting methods in underground engineering.In order to understand the long-term mechanical behavior of anchored rock mass,the standard sandstone specimens were drilled along radial direction and prestress was applied,and the mechanical behavior of rock creepage before and after anchoring was studied by indoor uniaxial compression creepage test.The results show that significant improvement of mechanical behavior of the anchored rock and restrain effect of radial deformation are obtained;after rock anchoring,the average axial transient deformation and radial transient deformation and creep deformation of the rock specimen reduce by 27%,60% and 14% respectively;in light of the deformation characteristics of the rock specimen,it is to adopt Burgers model to describe the rheological behavior of the two kinds of rock specimen and to analyze the law of parameters changes of the rheological model.更多还原