直流高密度电法在地质灾害治理中的效果和作用

Effects and Action of Direct Current High-density Electrical Method in the Management of Geological Disasters

根据皖南地区地质灾害的实际特点,能用于山区地质灾害勘察的物探方法相对较少,浅层地震探测基岩面法是工程物探的首选方法,但当遇到山区相对高差大,地形切割强烈,植被发育茂密且腐殖层厚度很大时,声波信号受屏蔽导致地震探测失效;因此尝试采用直流高密度电法探测山区覆土层厚度和基岩面起伏情况。根据物性标本观测资料建立模型并进行正反演计算分析,通过对休宁县七里顶地质灾害物探方法勘查实例,证实直流高密度电法可以获得较为理想的探测效果。在局部地形较平缓、地震反射波有效的区段进行两种物探方法的综合解释,可以提高解释的可靠性及解释精度。科学、合理地应用物探中各种方法,提高物探成果的解释精度,减少人为因素干扰,为皖南地区地质灾害治理工作提供可靠的理论依据,为灾害治理工程建设提供技术支持。

According to the actual characteristics of the geological disasters in south Anhui, the geophysical exploration methods can be used for the surveys of mountain geological disasters are less. Bedrock surface method of shallow seismic exploration is the first selection of engineering geophysical exploration methods. But when the relative elevation difference of mountains is big, the terrain cutting is strong, vegetation development is dense and the thickness of humus layer is very large, the earthquake detection would be failure because the acoustic signal is blocked. So, the workers try to use direct current high density resistivity method to detect the mountainous soil thickness and the ups and downs of bedrock surface. According to the physical specimen observation data, the model is established and the inversion calculation analysis was carried on. Through the exploration examples of geophysical exploration methods of geological disasters in Qiliding, Xiuning County, it is confirmed that direct current high-density electrical method can obtain the ideal effect. The integrated interpretation of the two methods of geophysical exploration in the area of the topography is smooth and seismic reflection wave is effective can improve the reliability of interpretation and the interpretation accuracy. Scientific and reasonable application of geophysical exploration in various methods, improvement of the interpretation accuracy of the geophysical exploration results, reducing of the artificial interference factors can provide reliable theoretical basis for geological disaster management work in south Anhui and provide technical support for disaster management project construction.