土壤氡浓度测量在广州市岩溶地面塌陷、地面沉降地质灾害调查中的应用
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摘要
由于受大型地下工程施工大量抽排地下水的影响,广州市大坦沙和金沙洲先后发生了大规模岩溶地面塌陷、地面沉降地质灾害,为查明区内岩溶发育和断裂带的分布情况,综合运用土壤氡浓度测量、高密度电法、浅层地震反射波、弹性波CT和地质雷达进行探则.由于受各种管线、电磁和震动的干扰,在城市开展电法、磁法、浅层地震等受到限制,而土壤氡浓度测量具有不受地电、地磁和震动干扰的优点.本文以土壤氡浓度测量在广州市金沙洲和大坦沙岩溶地面塌陷、地面沉降地质灾害应用为例,说明了土壤氡浓度测量机理、方法技术和影响因素,结果表明土壤氡浓度测量在广州市金沙洲和大坦沙岩溶地面塌陷、地面沉降地质灾害调查中取得了显著的效果,为广州市金沙洲和大坦沙地质灾害防治提供了基础资料.
Because of the influence of ground water was over pumped on construction.It happen large-scale karst surface collapse,ground subsidence geological disasters on Datansha and Jinshazhou in Guangzhou.In order to investigate the distribution of karst development and fracture structure,comprehensive use of soil radon concentration and high density resistivity method and shallow seismic reflection wave method and cross-hole seismic CT techniques and ground penetration radar,which have detected geological hazard of karst ground collapse and ground subsidence on Jinshazhou and Datansha in Guangzhou city.Due to the interference of various pipelines and electromagnetic and vibration,electrical method and magnetic method and seismic method is limited in the city,soil radon concentration measurement has the advantages of no electricity,magnetism and vibration disturbance.This article take the application of soil radon concentration measurement on Jinshazhou and Datansha in Guangzhou for example to explain:measuring mechanism and technology and influence factors of soil radon concentration.The results show that it has achieved remarkable effect on the investigation of karst surface collapse,ground subsidence geological disasters on Jinshazhou and Datansha in Guangzhou,to provide the basic data for the prevention and control of geological disasters in Jinshazhou and Datansha.
引文
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