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为满足工程建设的需要,如何提高深埋地下管线的探测精度是探测工作中的难点.在地铁盾构土建施工的工地,采用FDEM(frequency domain electromagnetic method)法对埋深约16m的成品油管道进行探测,第一步是经过地面测线X方向的探测工作,确定了目标管道的走向Y并缩小了范围,因为受干扰物体的影响,所以两种工作频率探测结果之间的定深误差很大,尚未满足工程实际的需要;第二步是在经过距目标管道5.0m处的两个孔内的Z方向进行探测,获得了离开目标管道较近“测线”上的H_z实测曲线;第三步是用H_z理论曲线与H_z实测曲线进行拟合反演,最终获得了定位、定深误差分别为20cm、10cm以内的探测精度,为地铁施工建设提供了精准的基础性技术资料.孔内Z方向的探测工作表明,“测线”离目标管道更近,又可以避开地面X方向测线上的干扰物的影响,可以提高探测精度.孔内探测是对地面X方向探测成果的检验,值得推广到对地面探测成果质量的验收中;采用拟合软件进行推断解释,是对探测数据的信息处理技术,将在FDEM法探测地下管线中得到广泛的应用.
In order to meet the needs of engineering construction, how to improve the detection accuracy of buried underground pipelines is a difficult task in the exploration.In the subway shield construction site, FDEM (frequency domain electromagnetic method) The first step is to detect the X-direction of the surface survey line to determine the direction Y of the target pipeline and narrow the scope. Because of the influence of the disturbing object, the deep-set error between the two working frequency probing results is very large Large, has not yet meet the actual needs of the project; the second step is to go through the target pipe 5.0m at the two holes in the Z direction to detect the direction of the test, get closer to the target pipe “measured line ” on the Hz measured curve ; The third step is to use H_z theoretical curve and H_z measured curve fitting inversion, and finally the positioning and depth of the error were 20cm, 10cm within the detection accuracy, the subway construction provides accurate basic technical information. The detection of the Z direction in the hole shows that the “line” is closer to the target pipelines and can avoid the influence of the interfering objects on the X-direction line on the ground, which can improve the detection accuracy. The test of X-direction detection results is worthy of popularization to the acceptance of the quality of ground detection results. Using the fitting software to make inference and interpretation, it is the information processing technology of the probe data and will be widely used in FDEM detection of underground pipelines.