利用探地雷达精确探测铁路路基含水率

发布时间：2018-05-26 04:47

本文选题：速度分析 + 探地雷达　；参考：《地球物理学进展》2017年02期

【摘要】：冻胀是寒冷地区铁路运营的一个重要的安全隐患,因此必须查明铁路路基地下含水情况.对于铁路路基这种水平层状介质,利用探地雷达共中心点法测量数据,对预处理后的数据进行速度分析获取,通过Dix公式转换求取层速度后将其转化为介电常数,利用Topp公式可得到该点地下含水率.将多个共中心点的含水率进行插值,可得到地下含水率剖面.然而由于铁路路基的地层具有浅薄层状的特点,这使得速度分析中存在各种干扰.利用GPRmax软件进行正演模拟,发现随着偏移距的增大多次波及折射波的问题越来越明显.为解决这类问题进行了大量的模拟试验,分析试验结果并提出在速度分析中的采用最优化角度消除多次波及折射波影响的办法,提高了处理精度.利用该技术处理实际数据,处理结果与常规激发极化法异常位置具有很好的可比性.
[Abstract]:Frost heaving is an important safety hazard for railway operation in cold regions, so it is necessary to find out the underground water content of railway subgrade. For the horizontal layered medium such as railway roadbed, the velocity analysis of the pre-processed data is carried out by using the ground penetrating radar common center point method, and the layer velocity is converted to dielectric constant by Dix formula conversion. The underground moisture content of this point can be obtained by using Topp formula. The underground water content profile can be obtained by interpolating the water content of several common center points. However, due to the shallow layer of railway subgrade, there are many kinds of interference in velocity analysis. The forward modeling with GPRmax software shows that the problem of multiple and refraction waves becomes more and more obvious with the increase of offset. In order to solve this kind of problems, a large number of simulation experiments have been carried out, and the experimental results have been analyzed and the method of eliminating the influence of multiple wave and refraction wave by using the optimum angle in velocity analysis has been put forward, which improves the processing accuracy. Using this technique to process the actual data, the results are comparable with the abnormal position of the conventional induced polarization method.
【作者单位】：吉林大学地球探测科学与技术学院;铁道第三勘察设计院集团有限公司;
【基金】：国家高技术研究发展计划(2013AA064603) 国家自然科学基金(40874073,41074076) 博士后科学基金面上资助(801151010423) 吉林大学研究生创新基金项目(2016201)联合资助
【分类号】：P631.3;U213.1

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