土工基础

›› 2015, Vol. 29 ›› Issue (4): 103-106.

• 工程实录 • 上一篇    下一篇

砂岩在循环荷载作用下的Felicity效应研究

唐晓军1,2，闫 兵1，许 江2   

  1. （1.重庆工业职业技术学院建筑与环境工程系，重庆 401120;2.重庆大学煤矿灾害动力学与控制国家重点试验室，重庆 400030）
  • 收稿日期:2014-10-01 出版日期:2015-08-20 发布日期:2015-11-06
  • 作者简介:唐晓军（1979-），男，讲师，研究方向为岩土工程，建筑安全。

Felicity Effect of Sandstone under Cycling Loading Conditions

TANG Xiaojun1,2, YAN Bing1, XU Jiang2   

  1. (1. Department of Building Engineering, Chongqing Industry Polytechnic College, Chongqing 401120;
    2. State Key Laboratory for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering, Chongqing University, Chongqing 400030)
  • Received:2014-10-01 Online:2015-08-20 Published:2015-11-06

摘要： 通过不同循环载荷水平作用下对砂岩变形特征的试验研究，探讨了砂岩在循环载荷作用下的状态参数、物性参数和声发射信息规律。试验结果表明：(1)砂岩在不同加、卸载阶段所产生的应变变化量不断增加，即随着加载水平的提高塑形变形加大；(2)砂岩在闭合阶段同样产生明显的声发射效应，而在卸载阶段未发现声发射现象；(3)砂岩在反复加、卸载过程中产生明显的Felicity效应；在每个应力水平下Felicity比不一样，应力水平越低，Felicity效应越明显，随着应力水平的增加，砂岩的各个物性和状态参数的Felicity效应有不断增大的趋势。

关键词: 砂岩, 循环载荷, 声发射, Felicity

Abstract: This paper presents the experimental study results of the state variables, physical parameters and acoustic emission properties of sandstone samples under various cyclic loading levels. The results indicate that, 1) under loadingunloading conditions, the amount of plastic strain increases with the increase of loading level; 2) distinct acoustic emissions are observed during the fissure closing period in the loading stage and no acoustic emissions are observed during the unloading stage; 3) Distinct Felicity Effect is encountered in both loading and unloading conditions. Different Felicity Effects are found in different stress levels. A lower stress level usually contributes a higher Felicity Effect. With the increase of the stress level, the state variables and the physical parameters demonstrate a trend of increase.

Key words: Sandstone, Cyclic Loading, Acoustic Emission, Felicity Effect