断层土壤气采气率对气氡观测结果影响的实验研究

Experimental Study on Gathering Gas Device and Collecting Gas Condition of Rn-content Observation in Fault Soil Gases

地震前兆观测是地震预报的基础。地震流体前兆观测在水资源过度开采的形势下,发展断层土壤气观测成为必然趋势。但地下流体观测技术规范未给出断层土壤气观测的集气-采气装置及采气条件的具体参数,而这些参数正是影响观测结果的重要因素。因此,本文对断层土壤气气氡观测的采气条件进行了实验研究及分析。结果表明,当日采气量一定时,集气室体积的大小对观测结果有较大影响。运用"采气率"这个概念来定量衡量断层土壤气观测装置系统的实用效果。集气室有效体积的大小应根据日采气量的多少来确定,采气量越大,集气室有效体积应越大,结合地震前兆观测实际,采气率应接近于1。本文实验研究结果对规范断层土壤气气氡观测提供了科学依据,也可供其它气体观测参考。

It is the inevitable trend of developing the observation methods of fault soil gas in earthquake fluid observation when the water resources is under the situation of extra-mining.The observation of Rn-content is always the importantly item in earthquake fluid observation measures.But the underground fluid observation technology standards has not given the concrete parameter of gathering-collecting gas device of Rn-observation in fault soil gas.These parameters are key factors to affect the observation result.Therefore,This article has done the experiment on different observation device and collecting conditions.The result indicated that,the gathering chamber detention volume have affect to observe result greatly,but the dead volume not.Therefore,the gathering chamber effective size should not retain the detention volume.Use the concept ＂collecting gas rate＂ to judge the practical effect of the fault soil gas observation system quantitatively.The gathering chamber effective size should act according to amount of the amount of collecting gas.The more the amount,the larger the gathering chamber,the ＂collecting gas rate＂ should be equal to 1.This article experimental result has provided the scientific basis to formulates the observation technology standards of Rn-content in the fault soil gas.