摘要
应用物探方法对滑坡进行勘查,已成为一种经济、快捷、有效的手段,文章首先从认识两类典型滑坡(Ⅰ类—土质滑坡、Ⅱ—类岩质滑坡)的滑坡结构开始,从物性差异角度分析了滑体、滑面和滑床的电性特征,说明了物探方法在滑坡勘查中的有效性;通过在某已知滑坡地质体上采用高密度电法不同装置、不同极距进行测试,得出滑坡勘查中电性响应特征的一般规律,总结了高密度电法在滑坡勘查中的技术要点和“滑面”解释原则;最后对贵州地区典型的2处滑坡(土质、岩质滑坡)勘查成果进行实例分析,结果显示:两类物质(土质、岩质)的岩石滑坡地质体电性响应特征具有相同规律,均有明显的三层电性结构层(高-低-高阻)分别对应滑体、滑面、滑床,但土质滑坡地质体的软弱夹层反映在电性剖面特征上的“体积效应”更显著。
Geophysical exploration methods are used in exploration has become a economic,fast and effective method.In this paper,from the understanding two kinds of typical landslide(Ⅰclasses-earthiness landslides,Ⅱ-rocky landslide)landslide structure,are analyzed from the points of view of property differences of sliding body,the electrical characteristics of slip surface and slip bed,illustrates the effectiveness of geophysical prospecting methods in landslide exploration;The general law of electrical response characteristics in landslide exploration is obtained by using high-density electrical method with different devices and different pole distances on a known landslide geological body,and the technical key points of high-density electrical method in landslide exploration and the principle of“sliding surface”interpretation are summarized.Finally,the case study of two typical landslides(soil and rock landslides)in Guizhou province shows that:The electrical response characteristics of rock landslide geological bodies of the two kinds of materials(soil and rock)have the same law,and there are obvious three layers of electrical structure layer(high-low-high resistance)corresponding to the sliding body,sliding surface and sliding bed respectively,but the“volume effect”reflected in the electrical profile characteristics of the soft interlayer of soil landslide geological bodies is more significant.
作者
吕天江
陈先童
黄启霖
宋启文
杨海龙
宋顺昌
陈德靖
杨武
LV Tian-jiang;CHEN Xian-tong;HUANG Qi-lin;SONG Qi-wen;YANG Hai-long;SONG Shun-chang;CHEN De-jing;YANG Wu(Institute of Geophysical and Geochemical Exploration,Guizhou Bureau of Geology and Mineral Resources,Guiyang 550018,Guizhou,China)
出处
《贵州地质》
2021年第4期419-429,397,共12页
Guizhou Geology
基金
贵州省地矿局青年地质科研项目(黔地矿科合(2018)38号)。
关键词
滑坡地质体
电性特征
高密度电法
装置
体积效应
滑面解释原则
Electrical characteristics of landslide geological body
High density electrical method
Device
Volume effect
Principle of slippery surface interpretation
