摘要
ZTEM(Z轴倾子电磁法)是一种天然场源频率域工程勘察方法.从电磁场麦克斯韦方程组出发,使用有限差分法,采用"台阶状"网格逼近地形的起伏变化,实现ZTEM倾子数据起伏地形二维有限差分数值模拟,分析起伏地形对ZTEM倾子响应的影响.结果表明:在工程勘察中,倾子数据具有横向分辨率高的优点,可更准确地反映地下岩土体或地下工程的横向边界;起伏地形对ZTEM倾子响应存在影响,频率越高,影响越大.
ZTEM（Z-Axis Tipper Electromagnetics） is a frequency-domain engineering investigation method thatresults from natural sources. Based on the Maxwell equations of electromagnetic field,the finite difference methodis adopted,and the “step like” grid is used to approximate the relief of the terrain,and the 2D finite differencemethod forward modeling of ZTEM with topography is developed. The effect of undulating terrain on the responseof ZTEM tipper is analyzed. The research results show that the ZTEM tipper data has the advantage of high lateralresolution in engineering investigation and it can reflect the transverse boundary of underground rock mass orunderground engineering accurately. The undulating terrain affects the response of ZTEM tipper. The higher thefrequency,the greater the effect.
作者
许智博
Xu Zhibo(Civil and Transportation College of Beihua University,Jilin 132013,China)
出处
《北华大学学报（自然科学版）》
CAS
2018年第6期810-814,共5页
Journal of Beihua University（Natural Science）
基金
国家自然科学基金项目(41374078)
关键词
工程勘察
ZTEM倾子
有限差分法
数值模拟
engineering investigation
ZTEM tipper
finite difference method
numerical simulation
