综合物探方法在广州市金沙洲岩溶地面塌陷、地面沉降地质灾害调查中的应用

综合运用跨孔地震CT、探地雷达、高密度电阻率法、浅层地震反射波、土壤氡浓度和波速测试6种物探方法,对广州市白云区金沙洲岩溶地面塌陷、地面沉降地质灾害进行探测,查明了该区的溶洞、土洞及构造破碎带的分布。介绍了各种方法技术,对综合物探成果进行总结,结合实例说明综合物探方法在该区的应用取得了显著效果,为地质灾害防治提供了基础地质资料。在广花盆地岩溶发育区,首次应用跨孔地震CT探测建筑物地下岩溶分布,为评价受岩溶地质灾害影响的建筑物安全提供依据。

The application of integrated geophysical techniques to the investigation of karst graound collapse and ground subsidence in Jingshazhou area,Guangzhou city

With the comprehensive use of cross-hole seismic CT technique, ground penetration radar, high density resistivity method, shallow seismic reflection wave method, soil radon concentration and bore wave velocity test method, the authors detected geological hazards of karst ground collapse and ground subsidence in Jinshazhou area, Baiyun district of Guangzhou city. The distribution of karst caves, soil caves and tectonic fracture zones was detected. The authors utilized all kinds of methods and techniques and summarized the results of integrated geophysical techniques. With practical examples, it is proved that integrated geophysical techniques are efficient in the investigation of karst ground collapse and ground subsidence geological hazards, and can provide important basic data for geological disaster prevention. The first cross-hole seismic CT was applied to detecting the distribution of structures of underground karst in Guang-hua basin, thus providing a basis for the safety of structures which are affected by karst geological hazards.