摘要
采用基于异常电位法的三维有限元数值模拟方法,对影响直流聚焦超前探测效果的各种因素进行了数值计算,以异常幅度大于三倍均方误差为标准,对各种影响因素是否忽略进行了判定。结果表明,距离隧道轴线6m之外的旁侧异常体对超前探测效果影响很小,坑道后方的金属体对超前探测效果几乎没有影响,坑道正前方水体灾害的规模大小对聚焦电流法超前探测距离的确定影响较大。最后制作隧道空腔模型进行水槽模拟实验,该实验验证了九极聚焦法的实际可行性,并且其探测效果明显优于传统的单极装置。
In this paper,numerical simulation for different factors affecting on DC focusing advanced detection is performed using three dimensional finite element method based on anomalous potential.The determination of ignored factors according to the standard is three times greater than the mean square error.The results show that the anomalous body outside 6meters away from the tunnel axis has no small effect of advanced detection;metal pipe nearby has little effect on the tunnel advanced detection effect;while the volume changes of target body（aquifer）in the front of the tunnel face has a greater influence on determination of advanced detection distance.The existence of the tunnel cavity has no impact on the effect of advanced detection.Finally we made a tunnel cavity module and carried on the flume simulation experiment,which confirmed the feasibility of the nine pole focusing method.And the detection effect of this method is obviously better than the traditional single pole device.
出处
《物探化探计算技术》
CAS
CSCD
2016年第4期473-479,共7页
Computing Techniques For Geophysical and Geochemical Exploration
基金
中央高校基本科研业务费专项资金(2014G2260011)
大学生创新创业训练计划项目(201410710047)
关键词
直流聚焦
隧道
超前探测
三维有限元
水槽模拟实验
DC focusing method
tunnel
advanced detection
three dimensional finite element
flume simulation experiment
