某机场场地稳定性的磁电探测应用研究

发布时间：2018-04-09 06:06

本文选题：断层　切入点：场地稳定性　出处：《成都理工大学》2015年硕士论文

【摘要】：为查清某拟建机场区地下岩石磁性是否稳定以及地下地质构造情况,对该待建区域开展高精度磁测、激电法等勘查研究工作,利用所获资料的磁异常及激电剖面及断面特征,综合地质特点,对该拟建机场场地稳定性进行了研究。首先对本研究区地质资料进行了收集和整理,得到本区域基本地质特征。再采用高精度地面磁测方法对研究区域进行扫面工作,对采集数据分析处理,得到磁异常变化特征,并初步确定了磁场变化较大的区域:全区仅西北角出现呈连续性较长、多条等值线平行的、呈不规则弧形的磁场梯级带,该磁场梯级带地磁场强度总体呈现由东南向西北逐渐增大的趋势。西南角区域与周围区域有明显异常差异,初步推断,此处可能有断层存在。然后,使用激电探测来验证该推断断层是否存在,并确定其边界的确切位置。沿垂直磁场梯级带走向布置了三条测线,使用联合剖面法与电阻率测深方法相结合,以确定推断断层的具体位置及其倾斜方向,并对其断面形态有所了解。测定结果正交点与低阻异常区域对比效果明显,据联合剖面曲线判断的倾向与视电阻率拟断面显示结果一致。磁、电异常及其解释推断结果表明,拟建机场跑道区场地基础稳定,研究区弧形磁场梯级带下方存在断层的可能性较大,有待进一步的工程验证。综合磁电探测方法,对车站、机场、高层建筑等场地进行稳定性评价研究,是一种行之有效的方法,可以用来解决类似问题,为生产生活和工程建设服务;每种物探方法都有一定的局限性,对于单一方法无法解释的异常,可综合几种不同的勘探方法,以发挥各种勘探方法的优势,弥补单一方法的不足,根据不同的地质情况和具体工作环境,将两种或多种不同的物探方法与地质综合使用,从而达到解决实际问题的目的。
[Abstract]:In order to find out whether the magnetic properties of underground rock and the underground geological structure are stable or not in a proposed airport area, the high precision magnetic survey and IP method are carried out in the area to be built, and the magnetic anomalies and the profile and section characteristics of the obtained data are used.The stability of the proposed airport site is studied in this paper.Firstly, the geological data of the study area are collected and sorted, and the basic geological characteristics of the region are obtained.Then using the method of high-precision ground magnetic measurement to sweep the study area, analyzing and processing the collected data, obtaining the characteristics of magnetic anomaly change, and preliminarily determining the region with large magnetic field change: the whole area only appears in the northwest corner with a longer continuity.The geomagnetic field intensity of the magnetic field cascade belt is increasing gradually from southeast to northwest.There are obvious differences between the southwest corner region and the surrounding area, and it is preliminarily concluded that there may be faults here.Then IP detection is used to verify the existence of the inferred fault and to determine the exact location of its boundary.Three measuring lines are arranged along the strike of the vertical magnetic field cascade zone. The combined section method and the resistivity sounding method are used to determine the specific location and inclined direction of the fault and to understand the shape of the fault section.The results show that the orthogonal points are more effective than the low-resistivity abnormal areas, and the tendency to judge according to the joint profile curve is consistent with the apparent resistivity pseudo section display results.The results of magnetic and electrical anomalies and their interpretation and inference indicate that the ground foundation of the proposed airport runway area is stable and the possibility of faults under the arc magnetic field cascade zone in the study area is high which needs further engineering verification.It is an effective method to evaluate the stability of stations, airports, high-rise buildings and so on. It can be used to solve similar problems and serve for production and life and engineering construction.Each geophysical exploration method has some limitations. For anomalies that can not be explained by a single method, several different exploration methods can be synthesized in order to give full play to the advantages of various exploration methods and to make up for the shortcomings of a single method.According to different geological conditions and specific working environment, two or more different geophysical exploration methods and geology are used comprehensively to solve practical problems.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.3;P631.2

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