基于磁梯度张量的滑坡监测方法

Landslide monitoring method based on magnetic gradient tensor

滑坡监测是滑坡防治的有效技术手段,针对钻孔测斜仪在滑坡深部发生大位移时失效的问题,提出一种基于磁梯度张量的滑坡监测方法。该方法以磁梯度张量理论为基础,使用了十字形阵列进行监测,通过测得的磁感应强度三分量得到轴心的梯度值,再根据反演计算出目标磁源的空间坐标,通过实验验证了该方法的可行性。在测量前将磁传感器阵列固定并计算偏离角,之后使永磁体按照矩形轨迹缓慢运动,并选取一定的测量点验证了该方法的精度,三轴平均绝对误差在0.1m以内,三轴最大误差在0.2m以内。最后分析了该方法存在误差的原因。

Landslide monitoring is an effective technical means for landslide prevention and control.Aiming at the failure problems of borehole inclinometer when large displacement occurs in the deep part of the landslide,a landslide monitoring method based on magnetic gradient tensor is proposed.This method is based on the magnetic gradient tensor theory.The cross array is used for monitoring.The gradient value of the axis is obtained from the three components of the measured magnetic flux density.Then the spatial coordinates of the target magnetic source are calculated according to the inversion.The feasibility of this method is verified by experiments.Before the measurement,the magnetic sensor array is fixed and the deviation angle is calculated.After that,the permanent magnet is moved slowly according to the rectangular trajectory.The precision of this method is verified by selecting certain measurement points.The average absolute error of the three axes is within 0.1 m,and the maximum error of the three axes is within 0.2 m.Finally,the reason for the error of this method is analyzed.