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首页> 外文期刊>Journal of Civil, Construction and Environmental Engineering >Electrical Resistivity and River Flow Velocity Studies of Ebonyi River Bridge Sites at Onicha-Oshiri and Idembia Areas, Southeastern Nigeria
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Electrical Resistivity and River Flow Velocity Studies of Ebonyi River Bridge Sites at Onicha-Oshiri and Idembia Areas, Southeastern Nigeria

机译：尼日利亚东南部Onicha-Oshiri和Idembia地区的Ebonyi河桥站点的电阻率和河水流速研究

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Pre-design Geoelectrical and River Velocity studies have been carried out at two bridge locations: Ebonyi River at Onicha-Oshiri road and Ebonyi River at Idembia Ezza. The objectives of the studies are to determine the geoelectrical parameters with respect to structure and rock type at these locations in combination with geology and carry out the analysis of the river velocity at various points. Four Vertical Electrical Sounding (VES) stations and six Velocity profiles were established (two VES stations and three velocity profiles per bridge site). Three geoelectric layers were proposed for Onicha-Oshiri and four to five geoelectric layers for Idembia. These layers comprise of the Top soil with resistivity range of 290-950Ωm, Silty lateritic soil with resistivity range of 140-181Ωm, Hard lateritic soil with resistivity range of 724-860Ωm, Silty sand with resistivity range of 163-494Ωm and Mudstone with resistivity range of 52-100Ωm. Results of Onicha-Oshiri lot show that the velocity values range from 1.28mssup-1/sup to 1.95mssup-1/sup. Along profile D, velocity values rise from point 1 to point 3. Along the present bridge profile, the values are nearly the same for points 1 and 2 and rise to 1.37mssup-1/sup at point 3. However along profile F, the velocity value is higher at point 2 (middle of the river). At Idembia site velocity values range from 0.634m ssup-1/sup to 0.99m ssup-1/sup. Apart from profile B where the value is highest at point 3 (edge of the river) values at profiles A and C have higher amounts at the edges and lower amounts at the central portion indicating increased scouring at the edges. The river at Onicha-Oshiri site has higher velocity possibly on the account of this site being at the youthful stage of the river. At Onicha end, the top lateritic matter is interbedded with fresh blue shale which may be offensive to any structure. This must be taken care of during construction by aiming at the hard sandstone below.
机译：在两个桥梁位置进行了预先设计的地电和河流速度研究：Onicha-Oshiri路的Ebonyi河和Idembia Ezza的Ebonyi河。研究的目的是结合地质学，确定这些位置与构造和岩石类型有关的地电参数，并对各个点的河速进行分析。建立了四个垂直电测深（VES）站和六个速度剖面（每个桥位两个VES站和三个速度剖面）。为Onicha-Oshiri提出了3个地电层，为Idembia提出了4至5个地电层。这些层包括电阻率范围为290-950Ωm的表层土壤，电阻率范围为140-181Ωm的粉质红土，电阻率范围为724-860Ωm的硬质红土，电阻率范围为163-494Ωm的粉质砂土和电阻率的泥岩范围52-100Ωm。 Onicha-Oshiri批次的结果表明，速度值的范围从1.28ms -1 到1.95ms -1 。沿着轮廓D，速度值从点1上升到点3。沿着当前的桥梁轮廓，点1和2的速度值几乎相同，并在点3上升到1.37ms -1 。沿剖面F，速度值在点2（河流中间）较高。在Idembia，站点速度值的范围为0.634m s -1 至0.99m s -1 。除了轮廓B处的值在点3（河流边缘）最高之外，轮廓A和C的值在边缘处的含量较高，而在中央部分的含量较低，表明边缘处的冲刷增加。 Onicha-Oshiri厂址的河流速度较高，可能是因为该厂址处于河流的年轻阶段。在奥尼查（Onicha）端，最上层的红土层与新鲜的蓝色页岩夹层，这可能对任何结构都不利。在施工过程中必须注意以下硬砂岩。

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