%0 Journal Article
%T 三轴应力条件下粉砂质泥岩分级松弛特性<br>Silt mudstone stress relaxation characteristics under tri-axial stress condition
%A 陈方明
%A 胡泉光
%A 宁光忠&lt
%A br&gt
%A CHEN Fangming
%A HU Quanguang
%A NING Guangzhong
%J 山东大学学报（工学版）
%D 2017
%R 10.6040/j.issn.1672-3961.0.2017.099
%X 摘要： 为研究软岩的应力松弛特性,采用分级荷载的方式对粉砂质泥岩进行三轴条件下的松弛试验。通过对不同围压条件下泥质粉砂松弛特性的分析,发现Burgers模型能够很好的反映出泥质粉砂岩不同应力条件下的松弛特性。研究应力松弛度随各级荷载初始应力水平的演化规律,结果表明:发现各级荷载初始应力较低时,应力松弛度随着各级荷载初始应力的升高而指数型降低;各级荷载初始应力较高时,部分岩样的应力松弛度呈现出略微升高的趋势。<br>Abstract: To investigate the stress relaxation characteristics of soft rock, step loading relaxation tests under tri-axial stress condition were performed with silt mudstone samples. Based on the analysis of silt mudstone relaxation characteristics with different confining stresses, the stress relaxation properties could be well reflected by the Burgers model. The evolution of stress relaxation rate with the change of original stresses was studied. The results showed that, when the original stress was lower, the stress relaxation rate decreased exponentially with the increase of the initial stress; while higher original stress was applied, the stress relaxation of some samples showed a slight increase trend
%K 松弛试验
%K Burgers模型
%K 应力松弛度
%K 粉砂质泥岩
%K &lt
%K br&gt
%K silt mudstone
%K Burgers model
%K stress relaxation rate
%K stress relaxation test
%U http://gxbwk.njournal.sdu.edu.cn/CN/10.6040/j.issn.1672-3961.0.2017.099