综合地球物理方法在剑岭地区地面塌陷勘查中的应用

Application of the Integrated Geophysical Methods in Exploration of The Ground Subside of Jianling Area

地面塌陷作为一种常见的地质灾害,给人民的生命和财产带来不可挽回的损失。广州市花都区赤坭镇剑岭村2006年8月发生部分地面塌陷、出现房屋裂缝,地球物理工作者接到任务后,及时赶赴现场,根据当时地面塌陷和开裂民房分布特征,进行构造地质、工程地质、水文地质调查和地质灾害勘查研究。采用高密度电法、探地雷达和瞬态瑞雷面波等综合物探方法,快速查明现有塌陷区的发展趋势和影响范围,居民区潜伏岩溶洞隙及其伴生土洞的分布情况、发育程度和发育规律。划分出危险地段,为地面塌陷地质灾害的防治提供技术支持,为政府抢险救灾、安置村民提供科学依据。

Ground subside is a very common geological disaster, which will threaten to people＇s life and properties. In August, 2006, ground subside happened in Jianlin of Guangzhou. The geophysical engineers were immediately sent there and they used integrated geophysical methods including high-density electricity survey, ground- penetrating radar （GPR）, and Rayleigh surface wave method to explore the cave or soft area of the subsur face near the ground. Thanks to integrated geophysics detecting, it was identified that where the easy subside place of the surface could be used for the prevention of the geological disaster. In this detection, we find the approximate position of the cave, confirm the depth of the cave or soft object by Rayleigh surface wave method, and find the soil object saturation contain water by ground-penetrating radar.