轴向应力对红砂岩氡气析出量影响的探究  

A study of granite radon in the precipitation quantity under axial stress

作　　者：徐立鹏[1,2] 葛良全[1,3] 罗耀耀[1,3] 邹功江[1] 

机构地区：[1]成都理工大学核技术与自动化工程学院,成都610059 [2]四川省辐射环境管理监测中心站,成都610031 [3]地学核技术四川省重点实验室,成都610059

出　　处：《核技术》2014年第11期10-16,共7页Nuclear Techniques

基　　金：国家"863计划"项目(No.2012AA06A61803);国家自然科学基金项目(No.41374136)资助

摘　　要：针对不同轴向应力下的红砂岩试件,进行试件轴向应变实验与氡气析出量测量实验。进而探讨了轴向应力与试件轴向应变的相关性,研究了轴向应力与试件氡气析出量之间的关系。实验结果表明,Burgers蠕变模型能表征实验试件瞬时加载应变、衰减蠕变和稳态蠕变等蠕变特征;根据瞬时和累积两种测氡方法的测量结果,发现二者的相关性系数达到0.97(p<0.05);实验证实轴向应力与红砂岩的氡析出量呈负相关性。这一结果为孕震过程中岩石受压导致自由氡析出的减少提供了有力的证据,对氡气预报地震具有积极的指导意义。Background： Many scholars at home and abroad had engaged in the research of underground radon in the earthquake. Purpose： The aim is to discuss the relationship between axial stress and radon precipitation quantity. Methods： Aim at red sandstone specimen under different axial stress, this paper made the axial strain experiment and the radon precipitation quantity measurement experiment. Results： The results show that the Burgers creep model can represent the creep characteristics such as instantaneous loading strain, decay creep and steady creep; according to the results of instantaneous radon measurement method and cumulative radon measurement method, the correlation coefficient between the axial stress and red sandstone radon precipitation quantity is up to 0.97 （p〈0.05）; the experimental result confirmed that the axial stress has a negative correlation with radon precipitation quantity. Conclusion： This result provides a strong evidence for the rock radon precipitation reduces under stress in the process of earthquake preparation, it has a positive guiding significance for using radon to forecast the earthquake.

关 键 词：轴向应力 红砂岩 氡析出量 

分 类 号：TL8[核科学技术—核技术及应用] TU458[建筑科学—岩土工程]