不同集气装置对断层土壤气观测数据质量的影响分析

Analysis of the Influence of Different Gas Collecting Devices on the Quality of Fault Gas Observation Data

针对我国中西部干旱少雨地区普遍使用的断层土壤气观测集气坑设计施工方案,不能有效排除东南部地区地下水埋深浅、储量丰富、季节性强降雨频发等环境因素影响,对于地势较洼或地下水补充迅速的台址,夏季强降雨容易导致潜水面快速抬升,造成测氡仪闪烁室出现进水故障,从而导致测得的氡浓度急速下降,对地震前兆数据的分析研究造成干扰。充分考虑仪器参数和运行环境,因地制宜对集气设施和观测井装置进行改进,提出堆土式集气室和钻孔套管式集气装置设计方案,宿迁市断层土壤气观测实践表明该方案可以满足在我国东南部地区开展断层土壤气观测研究的技术要求。

In this paper,we analyzed the influence of heavy rainfall on the observation data of fault soil gas in the Suqian section of the Tanlu Fault Zone.We obtained some practical design and construction schemes of fault soil gas observation gas collecting pit in arid areas in the middle and west of our country.The influence of environmental factors,such as shallow groundwater depth,abundant reserves,and frequent seasonal heavy rainfall,cannot be effectively excluded in the southeast of China.Moreover,the strong rainfall in summer could cause the rapid rise of the diving surfaces and the failure of the Scintillation Chamber,which further causes the rapid decrease of the radon concentration and interferes the analysis of the earthquake precursor.Therefore,the researchers should take into account that the instrument parameters and operating environment should be adapted to the local conditions to improve gas gathering facilities and observation well equipment,which is helpful to meet the technical requirements of fault soil gas observation in the southeast China.