【摘要】 黄土在全世界广泛分布，在中国西北地区尤为典型。由于过度的农业灌溉，导致中国甘肃兰州黑方台黄土滑坡频发。地球物理勘探是滑坡不良工程地质勘察所采用的重要方法之一，工程地质调绘、钻探、物探、监测等众多方法综合进行工程地质评价，以期给予滑坡防护设计及施工尽可能详实的基础资料。使用地球物理方法探测黄土滑坡的理论可行性至关重要。通过对中国甘肃兰州黑方台滑坡群的浅层地质结构进行勘察，建立了典型大地电磁法地电模型，综合使用了二维有限单元法正演数值模拟及工程地质分析方法，完成了黄土滑坡区大地电磁场分布特征的研究，是地质过程分析方法在地球物理勘探技术中的典型应用。本研究提供了中国甘肃黑方台典型地层结构、不同地下水分布的电性特征，验证了正演建模及计算结果的正确性，为大地电磁法探测滑坡提供了较为详实的理论依据。本研究对中国甘肃兰州黑方台滑坡进行了正演数值模拟，可以为滑坡调查提供详实的地球物理依据，验证地质调查和滑坡设计的结果，并促进黑方台地区农业的可持续发展。更多还原

【Abstract】 Loess soils are widely distributed worldwide and typical in northwest China,and excessive agricultural irrigation has caused landslides in the area,specifically in the Heifangtai loess region in Lanzhou,Gansu,China.Geophysical exploration is an essential method in landslide engineering geological surveys,and geological surveying,drilling,geophysical prospecting,monitoring,and other methods are used for performing engineering geological evaluation and obtaining comprehensive basic data for landslide protection design and construction.The theoretical feasibility of using geophysical methods in loess landslide detection is essential.On the basis of the shallow geological structure of the Heifangtai landslide region in Lanzhou,Gansu,China,a typical geoelectric model of the magnetotelluric method was established,and the loess landslide area was modeled through a two-dimensional finite element method,forward numerical simulation,and engineering geological analysis.The distribution characteristics of the magnetotelluric field were determined.This is a typical application of the geological process analysis method in geophysical exploration.This study provides the typical stratigraphic structure and electrical characteristics of different groundwater distributions in Heifangtai,Gansu,China,verifies the accuracy of forward modeling and calculation results,and provides a detailed theoretical basis for landslide detection through magnetotelluric methods.Through the numerical simulation of the forward modeling of the Heifangtai landslide region in Lanzhou,Gansu,China,this study can provide a detailed geophysical basis for landslide investigation,corroborate results of geological investigation and landslide design,and facilitate the sustainable development of agriculture in Heifangtai.更多还原