【摘要】 土壤层次是反映土地复垦质量的重要指标,传统的挖剖面测量方法费时费力,无法满足大范围土壤层次检测的需要。探地雷达是一种快速、无损、准确的地球物理探测技术,目前使用较多的反射法探测由于反射信号能量不足导致成像分辨率低。为解决上述问题,提出了探地雷达层析成像探测方法,建立了含原状土、粗砂、细土和细砂的复垦土壤分层数字模型,对选定的剖面进行模拟层析探测,采用最小平方正交二乘算法反演计算,以节省内存和计算时间。仿真结果表明,重建图像中不同介质区域之间的界线明显,计算结果和仿真模型的数据相吻合,证实了改进方法用于复垦土壤分层结构探测的可行性和有效性,为大范围土壤层次检测提供了新的思路。更多还原

【Abstract】 Layer Structure is an important indicator of quality of reclamation soil. Digging profiles takes time and energy and cannot satisfy the demand of large-scale soil layer detection. Ground Penetrating Radar( GPR) is noncontact,quick and accurate. Insufficient reflected signal energy aquired by GPR using traditional reflection method leads to low resolution. Aiming at above problems,tomography technology can be used in GPR detection for layer structure of mine reclamation soil. The model consists of undisturbed soil,coarse sand,soil and fine sand,from bottom to top. Inversion equations were established after dissecting the detected profile,and Least Square QR-factorization( LSQR) was employed to solve the equations. Inversion results show agreement with model data,and the difference between layers is clear in the contour plots. This verifies that the radar tomography technology is practical for detection for layer structure of mine reclamation soil,and provides a new way to large-scale soil layer detection.更多还原