基于柔性测斜装置的滑坡大变形误差识别与修正

Recognition and correction of large deformation errors of landslide based on flexible inclinometer device

近年来随着MEMS技术的兴起,柔性测斜装置应用越来越广泛。介绍了柔性测斜装置安装工艺及其变形计算原理,并据此分析了此类装置在滑坡大变形情况下的误差产生原因,同时也研究了此类误差的识别及其修正方法。研究认为,柔性测斜装置具有显著优于普通测斜仪的大量程、高精度等优势,但同时也因其量程较广,导致在进行大变形观测时,其累积的测量误差不能像传统小变形观测那样被直接忽略。通过对典型底部抽离情况下柔性测斜装置测量原理的解析,确定其误差主要来源于零点偏移及测孔与装置间拉伸不匹配两个方面,给出了此类误差识别及估算正确结果的方法。

With the emerging of MEMS technique, the flexible inclinometer device is widely used in recent years. The installation process and deformation computing theory of flexible inclinometer devices is firstly introduced, and the cause of the error under large deformation of landslide is analyzed accordingly, as well as the error recognition and correction methods. The research results show that the flexible inclinometer device has the advantages such as wide range and high accuracy compared with the traditional inclinometer; however, the cumulative measurement error cannot be ignored in large deformation monitoring as small deformation monitoring by traditional device. Through analyzing the measurement principles of inclinometer device under typical bottom extraction condition, we demonstrate that the error is mainly cuased by two factors, i.e. the datum point offset and the tension mismatch between the measuring hole and the flexible inclinometer, and the method of identifying and correcting the error was proposed.