单轴压力下花岗岩氡析出量的探究  

Explore the precipitation amount of radon in granite under uniaxial pressure

作　　者：严俊[1] 葛良全[1] 邹功江[1] 赵剑锟[1] 谷懿[1] 徐立鹏[1] 罗耀耀[1] 贾雪辉[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

出　　处：《核技术》2013年第5期27-30,共4页Nuclear Techniques

基　　金：国家自然科学基金(41074093);863计划"资源环境技术领域"课题(2012AA061803)资助

摘　　要：对不同的单轴压力下花岗岩氡析出量的影响进行实验探究,得到单轴压力值与花岗岩试样析出氡之间的关系,以此建立地质体处于孕震压密阶段时,氡析出量变化的实验模型。利用岩石三轴蠕(徐)变试验机对花岗岩试样进行单轴加压,在不同的单轴压力下采用CR-39固体径迹探测器对试样氡析出量进行累计测量。当试样初始压密与弹性变形阶段时,氡析出量随压力的增大而降低。为地震前氡的负异常情况提供了一定的实验参考依据,对利用氡气异常预测地震提供一定的参考价值。Background： For a long time, many scholars both at home and abroad have been engaged in radon monitoring for seismic forecast. Purpose： This paper deals with the relationship between uniaxial stress and rock radon exhalation, and wants to provide the basis of earthquake prediction by using the change of radon concentration. Methods： The uniaxial force applied on the granite sample is carried out using rock triaxial creep testing machine. The total accumulative measurement for sample radon emanation under different uniaxial pressure is performed using CR-39 solid track detector. Results： When the sample in the initial consolidation and elastic deformation stage, the radon emanation quantity with decreased the increase of the pressure. Granite samples＇ biggest axial displacement positively correlated to the uniaxial tension applied on them. With the development of time, the ＂native＂ fissure of sample is compressed tighter by degrees, lead to the smaller amounts of radon exhalation in fracture. Conclusions： This article provides some experimental reference for the negative anomalies circumstances of radon before earthquake.

关 键 词：单轴压力 花岗岩 氡浓度 固体径迹探测器 

分 类 号：TL99[核科学技术—核技术及应用]