地震研究

利用跨断层土壤气测量方法,连续两年对北京西部黄庄—高丽营断裂、八宝山断裂和南口山前断裂CO2与Rn的脱气浓度与通量进行了测量,分析了研究区断裂带脱气特征及产生的环境影响。结果表明:黄庄—高丽营断裂北段的西王路测区土壤气浓度平均值及KQ值最大,反映了该断裂北段构造活动性较强; 研究区3条断裂的土壤气浓度均值及构造活动性呈现东高西低的特征,与首都圈土壤气地球化学背景场特征一致。3条断裂脱气对大气CO2的年贡献量约为0.45×106 t。西王路测区土壤气Rn平均浓度高于20 kBq/m3,其附近建筑物应采取相应的底层地面抗开裂措施,部分测点浓度高于30 kBq/m3及50 kBq/m3,其附近建筑应采取防水处理或综合防氡措施。

The concentrations and fluxes of CO2 and Rn degassing from the Huangzhuang-Gaoliying fault,the Babaoshan fault and the Nankou piedmont fault in western Beijing were measured in two consecutive years using the cross-fault soil gas measurement method,and the fault degassing characteristics in the study area and their environmental impact were analyzed.The results indicated that:The average soil gas concentration and KQ value of the Xiwanglu survey area in the northern section of the Huangzhuang-Gaoliying fault are the largest,which indicated the strong tectonic activity in the northern segment of the fault.The average soil gas concentration and tectonic activity of the three faults in the study area characterized higher in the East and lower in the West which are consistent with the geochemical background characteristics of the soil gas in the capital area.The total annual output of CO2 from the three active fault are approximately 0.45×106 t.The average concentration of Rn in soil gas in the Xiwanglu survey area is higher than 20 kBq?m-3,the ground floor anti-cracking measures should be taken for nearby buildings,and in some measured points which the concentration of Rn in soil gas are higher than 30 kBq?m-3or 50 kBq?m-3,waterproof treatment or comprehensive radon prevention measures are required to prevent Rn diffusing into the buildings.

引言
1 地质概况
2 土壤气测量方法
3 结果与讨论
4 结论

图1 北京西部活动断裂区域地质概况及土壤气测区分布<br/>Fig.1 Geological structure of the main active faults and the survey areas for soil gas in western Beijing

图1 北京西部活动断裂区域地质概况及土壤气测区分布
Fig.1 Geological structure of the main active faults and the survey areas for soil gas in western Beijing

表1 土壤气测区基本信息及测点数<br/>Tab.1 Basic information of the survey areas and the number of measuring points for soil gas

表1 土壤气测区基本信息及测点数
Tab.1 Basic information of the survey areas and the number of measuring points for soil gas

图2 跨断层测点布置示意图<br/>Fig.2 Sketch of arrangement of measuring sites across the fault

图2 跨断层测点布置示意图
Fig.2 Sketch of arrangement of measuring sites across the fault

图3 土壤气浓度(a)和通量(b)测量示意图<br/>Fig.3 Sketch of measurements of soil gas concentration(a)and flux(b)

图3 土壤气浓度(a)和通量(b)测量示意图
Fig.3 Sketch of measurements of soil gas concentration(a)and flux(b)

表2 研究区活动断裂土壤气浓度和通量测量结果<br/>Tab.2 Statistics of soil gas CO2 and Rn concentrations and flux of active faults in research area

表2 研究区活动断裂土壤气浓度和通量测量结果
Tab.2 Statistics of soil gas CO2 and Rn concentrations and flux of active faults in research area

图4 各测区剖面土壤气浓度分布
Fig.4 Distribution of soil gas concentrations in each survey area profile

图5 各测区土壤气平均浓度(a)、CO2与Rn平均浓度相关性(b)及测区KQ值(c)<br/>Fig.5 Soil gas average concentration(a),the correlation between average concentration of CO2 and Rn(b),and KQ value(c)in each survey area

图5 各测区土壤气平均浓度(a)、CO2与Rn平均浓度相关性(b)及测区KQ值(c)
Fig.5 Soil gas average concentration(a),the correlation between average concentration of CO2 and Rn(b),and KQ value(c)in each survey area

表3 土壤气CO2风险水平分级(Baxter等,1999)<br/>Tab.3 Risk levels of concentration of CO2 in soil gas(Baxter et al,1999)

表3 土壤气CO2风险水平分级(Baxter等,1999)
Tab.3 Risk levels of concentration of CO2 in soil gas(Baxter et al,1999)

表4 研究区断裂带CO2脱气平均通量和对大气的贡献量<br/>Tab.4 Average flux and output of CO2 from active faults in research area

表4 研究区断裂带CO2脱气平均通量和对大气的贡献量
Tab.4 Average flux and output of CO2 from active faults in research area

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备注

引言

1 地质概况

2 土壤气测量方法

3 结果与讨论

4 结论

期刊信息