Geophysical survey involving Schlumberger Vertical Electrical Sounding, 2-D imaging dipole–dipole technique and ground magnetic method were carried out along Ibadan-Ife Highway located in the Precambrian Basement Complex of Southwestern, Nigeria to examine the geological factors responsible for Highway pavement failure. This was with the view to detailing the subsurface geoelectric sequence, mapping the subsurface structural features within the sub-grade soil and delineating the bedrock relief as a means of establishing the cause(s) of the road pavement failure. The geoelectric sections, 2-D resistivity structures and modeled magnetic profiles revealed that the stable segments were founded on a shallow/outcropping basement near homogeneous substratum devoid of major geological features while linear features suspected to be fault/fractured zones, buried stream channels, bedrock depressions and lithological contacts were identified beneath the failed segments of the highway pavement. The geoelectric sections generally identified four geologic layers comprising the topsoil, weathered layer, partly weathered/fractured basement and fresh bedrock. Thus, the failed portions of the road are probably precipitated by very thick and low resistive substratum (clay) beneath the highway pavement and the identified suspected linear features are the major geological factors responsible for the highway pavement failure.

中文翻译：

---

地球物理方法在公路路面破坏中的应用：以尼日利亚西南部地下复杂地形为例

沿着斯伦贝谢垂直电测深仪，二维成像偶极-偶极技术和地磁方法进行了地球物理勘测，研究对象是尼日利亚西南部前寒武纪基底复合体中的伊巴丹-Ife公路，以研究造成公路路面破坏的地质因素。目的是详细说明地下地电序列，绘制路基土壤中的地下结构特征并描绘基岩浮雕，以作为确定道路路面破坏原因的一种方法。地电剖面，二维电阻率结构和模拟的磁剖面表明，稳定段建立在浅层/露头基底上，靠近均质层，没有主要地质特征，而线性特征被怀疑是断层/断裂带，在公路路面的故障部分下方发现了地下​​河道，基岩凹陷和岩性接触。地电部分通常确定了四个地质层，包括表土，风化层，部分风化/破裂的地下室和新鲜基岩。因此，道路的故障部分很可能是由高速公路路面下方的厚而低电阻率的底层（黏土）沉淀的，而确定的可疑线性特征是造成高速公路路面破坏的主要地质因素。部分风化/破裂的地下室和新鲜的基岩。因此，道路的故障部分很可能是由高速公路路面下方的厚而低电阻率的底层（黏土）沉淀的，而确定的可疑线性特征是造成高速公路路面破坏的主要地质因素。部分风化/破裂的地下室和新鲜的基岩。因此，道路的故障部分很可能是由高速公路路面下方的厚而低电阻率的底层（粘土）引起的，并且确定的可疑线性特征是造成高速公路路面破坏的主要地质因素。