均质砂岩蠕变破坏特征与粘弹性参数演化规律试验研究  

Experimental Study on Creep Failure Characteristics and Viscoelastic Parameters Evolution of Homogeneous Sandstone

作　　者：徐飞[1] 杨毅然 胡甘来 张涵 XU Fei;YANG Yiran;HU Ganlai;ZHANG Han(School of Civil Engineering,Xijing University;Shaanxi Key Laboratory of Concrete Safety and Durability)

机构地区：[1]西京学院土木工程学院,陕西省西安市710123 [2]陕西省混凝土安全与耐久性重点实验室

出　　处：《现代矿业》2022年第12期124-128,共5页Modern Mining

基　　金：西京学院2021年大学生创新创业训练计划项目(编号:190810011105)。

摘　　要：均质砂岩在地壳广泛存在,是地下资源开采过程中最为常见的天然地质体,掌握均质砂岩的力学特性和参数演化规律对于地下资源安全开采具有关键价值。以煤炭井工开采中常见的均质砂岩为研究对象,采用单轴蠕变试验获取不同静载水平作用下均质砂岩的蠕变破坏特征。通过参数估计方法得到了粘弹性参数,并获取了粘弹性参数的演化规律和特征。结果表明,在不同静载作用下,均质砂岩的蠕变破坏特征具有较大差异性,麦克斯维尔粘度越大,试样越容易发生破坏;而粘度较低的试样由于其较强的流动能力,则更倾向在更长的时间域中产生更大的蠕变变形进而发生破坏。Homogeneous sandstone widely exists in the crust and is the most common natural geological body in the process of underground resource exploitation.Mastering the mechanical properties and parameter evolution law of homogeneous sandstone is of key value for the safe exploitation of underground resources.Taking the common homogeneous sandstone in coal mining as the research object,the creep failure characteristics of homogeneous sandstone under different static load levels were obtained by uniaxial creep test.The viscoelastic parameters are obtained by parameter estimation method,and the evolution law and characteristics of viscoelastic parameters are obtained.The results show that under different static loads,the creep failure characteristics of homogeneous sandstone are quite different.The greater the Maxwell viscosity,the more likely the sample is to be damaged.The samples with lower viscosity are more likely to produce greater creep deformation and failure in a longer time domain due to their strong flow ability.

关 键 词：煤炭开采 砂岩 蠕变 麦克斯维尔粘度 

分 类 号：TD313[矿业工程—矿井建设]