应用磁异常信号监测填埋体位移的技术研究

在比较填埋场内部位移监测方法的基础上，提出利用增强填埋场内目标体所产生的磁异常信号(磁通量密度，以ΔT计)观测填埋体位移的方法. 建立正演模型，研究目标体磁异常信号的理论曲线变化特征及其在不同环境条件下的信号变化规律. 对ΔT实测值分析表明，填埋场环境背景值(-100～100 nT)并不会掩盖特征目标体磁异常信号的最大理论值(724.31～2 804.24 nT)，确定了该方法的可行性. 模拟表明，在规定目标体大小、磁化强度的条件下，当目标体埋深为1～2 m时，其水平位置定位误差≤0.02 m，竖直位置定位误差≤0.09 m，证实了磁测定位方法具有良好的应用前景. 

Technology Research on Applying Magnetic Anomaly Signals to Monitor Displacement of Waste Landfills

On the basis of comparison with current landfill internal displacementmonitoring tests, this paper proposes a theory of using magnetic anomaly signals (ΔT) to monitor the internal displacement in a landfill. Forward modelingwasestablished to study the theoretical curve characteristics and variation regularity under different conditions of the magnetic anomaly signals generated by specific magnetic targets. According to field analysis of the landfill magnetic anomaly signal data, we obtained the background value of -100-100 nT of landfill, which did not shield the largest theoretical value of the target magnetic anomaly signal 724.31-2,804.24 nT. Field simulation tests showed horizontal and vertical location errors of ≤0.02 m and ≤0.09 m, respectively, using a magnetometer with specific target with defined size and magnetization buried 1-2 m below ground. This proved that the magnetic monitering location method has good application prospects.