Shentu Nanying, Qiu Guohua, Li Qing, Tong Renyuan, Shentu Nankai, Wang Yanjie
College of Mechanical & Electrical Engineering, China Jiliang University, Hangzhou 310018, China.
College of Information Engineering, China Jiliang University, Hangzhou 310018, China.
Sensors (Basel). 2015 Apr 13;15(4):8406-28. doi: 10.3390/s150408406.
Underground displacement monitoring is a key means to monitor and evaluate geological disasters and geotechnical projects. There exist few practical instruments able to monitor subsurface horizontal and vertical displacements simultaneously due to monitoring invisibility and complexity. A novel underground displacement 3D measuring sensor had been proposed in our previous studies, and great efforts have been taken in the basic theoretical research of underground displacement sensing and measuring characteristics by virtue of modeling, simulation and experiments. This paper presents an innovative underground displacement joint inversion method by mixing a specific forward modeling approach with an approximate optimization inversion procedure. It can realize a joint inversion of underground horizontal displacement and vertical displacement for the proposed 3D sensor. Comparative studies have been conducted between the measured and inversed parameters of underground horizontal and vertical displacements under a variety of experimental and inverse conditions. The results showed that when experimentally measured horizontal displacements and vertical displacements are both varied within 0~30 mm, horizontal displacement and vertical displacement inversion discrepancies are generally less than 3 mm and 1 mm, respectively, under three kinds of simulated underground displacement monitoring circumstances. This implies that our proposed underground displacement joint inversion method is robust and efficient to predict the measuring values of underground horizontal and vertical displacements for the proposed sensor.
地下位移监测是监测和评估地质灾害及岩土工程的关键手段。由于监测的不可见性和复杂性，能够同时监测地下水平和垂直位移的实用仪器很少。在我们之前的研究中提出了一种新型的地下位移三维测量传感器，并通过建模、仿真和实验在地下位移传感和测量特性的基础理论研究方面付出了巨大努力。本文提出了一种创新的地下位移联合反演方法，该方法将特定的正演建模方法与近似优化反演过程相结合。它可以对所提出的三维传感器实现地下水平位移和垂直位移的联合反演。在各种实验和反演条件下，对地下水平和垂直位移的测量参数与反演参数进行了对比研究。结果表明，当实验测量的水平位移和垂直位移均在0~30mm范围内变化时，在三种模拟地下位移监测情况下，水平位移和垂直位移的反演偏差通常分别小于3mm和1mm。这意味着我们提出的地下位移联合反演方法对于预测所提出传感器的地下水平和垂直位移测量值是稳健且有效的。
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