Buildings along the flood plain of River Osun, southwest Nigeria, are usually thought of as been a safe haven for residence over the years. But in recent times with vast (increasing) population and growing urbanization, some of the buildings currently experience structural damages not related to constructional designs but rather ground conditions around building foundations. The ground conditions (seepages in this case) and how it influences properties of soils (water moisture, permeability etc.) to support the foundation of buildings. This paper attempts to map out seepages in heterogeneous soils around buildings in Erinle, southwest Nigeria where building cracks probably as a result of water seepages from subsurface through fissures and fractures where noticed. These cracks are a probable manifestation of a weakened foundation that could overtime result to a collapse, hence the need to investigate seepage prone zones. To achieve this, electrical resistivity (ER) and Electromagnetic Ground Penetrating Radar (EM-GPR) surveys were made along affected buildings to map out possible causes of deterioration. Geo-sections (analyzed ER data) shows high resistivity layer (topsoil) underlain by low resistivity layer (weathered basement) confirmed by planer reflections (topsoil) and fairly smooth to smooth reflections (weathered basement) in Radargrams (analyzed GPR data). An integration of the geo-section and radargram produced from ER and GPR data shows that buildings along traverses 1, 2, 3 and 5 is most prone to seepages especially as it exhibits very low anomalously resistivity values (< 25 Ωm) but this is not the case for buildings along traverses 4, 6, 7 and 8.

中文翻译：

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使用地球物理方法对一些建筑物下的非均质土壤进行渗流调查：以尼日利亚西南部为例

多年来，尼日利亚西南部奥森河（River Osun）泛滥平原上的建筑物通常被认为是居住的避风港。但是近来随着人口的庞大（增加）和城市化的发展，一些建筑物目前遭受的结构破坏与建筑设计无关，而与建筑物基础周围的地面条件有关。地面条件（在这种情况下为渗流）以及它如何影响土壤特性（水分，渗透性等）以支撑建筑物的基础。本文试图绘制尼日利亚西南部埃林勒（Erinle）建筑物周围非均质土壤中的渗流图，那里的建筑物裂缝可能是由于地下，裂缝和裂缝中渗水引起的。这些裂缝很可能是地基薄弱的一种表现，可能会导致加班而导致坍塌，因此需要研究易于渗水的区域。为了实现这一目标，对受影响的建筑物进行了电阻率（ER）和电磁探地雷达（EM-GPR）测量，以查明可能的恶化原因。地理剖面（已分析的ER数据）显示了低电阻率层（风化的地下室）下的高电阻率层（表土），通过雷达反射图的平面反射（表土）证实了相当平滑至平滑的反射（风化的地下室）（分析的GPR数据）。根据ER和GPR数据生成的地理剖面和雷达图的整合显示，沿着导线1、2、3和5的建筑物最容易渗漏，尤其是因为它表现出非常低的反常电阻率值（<