黄土-泥岩切层滑坡勘察中的电法解译分析

Analysis of Electrical Method Interpretation in the Geological Investigation of Loess-mudstone Insequent Landslidet

省道204公路中有一处黄土-泥岩切层滑坡位于早期海原大地震产生的老滑坡中前部,利用高密度电法并结合工程地质调绘、钻孔验证对该滑坡进行了综合探测研究,目的是查明滑体的规模大小、滑动带的形态特征及发育情况。结果表明:电法解译的断面很好的反应了地层结构及空间分布特征,表层松散的黄土堆积物呈高阻反应,中部碎裂状泥岩因赋水呈低阻反应,下部风化程度较低的泥岩因含石膏矿脉电阻率值变化范围较大。这一研究结果说明高密度电法在黄土-泥岩切层滑坡中具有准确性和有效性,为进一步分析研究因海原大地震诱发的黄土地震滑坡机理及危险性评价等提供了可靠的物探数据。

In the middle and in front of the old landslide caused by the early Haiyuan earthquake,Provincial Highway 204has a loess-mudstone insequent landslide.This paper will conduct a comprehensive exploration study of the landslide using the high-density resistivity method,engineering geological mapping,and borehole verification to determine the size of the landslide,the morphological characteristics of the slide zone,and its development.The results of this study demonstrate that the electrical method interpretation can reflect the stratigraphic structure and spatial distribution characteristics with high accuracy and validity.The loose loess accumulation on the surface is in a high resistance state,the fractured mudstone in the middle is in a low resistance state because of the water supply,and the lower weathered mudstone contains gypsum veins,resulting in a wide range of resistivity values.The results of this study demonstrate that the high-density resistivity method provides reliable geophysical data for further analysis of the mechanism and risk assessment of the loess seismic landslide caused by the Haiyuan earthquake.It is accurate and effective in predicting loess-mudstone shear landslides.