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针对目前几种山体滑坡、泥石流等岩土变形造成的地质灾害监测方法的不足,提出一种新型岩土变形测量方法,该方法是将螺旋平行传输线与时域反射技术相结合形成的一种变形分布测量技术。设计变形分布式测量标定系统,运用系统中的拉伸装置分别对162 cm螺旋线进行整体拉伸与对500 cm螺旋线进行定位拉伸,同时运用系统中的时域反射装置对被拉伸的螺旋线进行测量,并运用偏最小二乘法分别对2组测量数据进行建模。将162 cm螺旋线整体逐厘米拉伸至195 cm,每拉伸1 cm测量一次时域反射数据,所建模型对拉伸量的预测值最大误差为0.3%。将500 cm螺旋线逐次从起始端至末端每隔10 cm拉伸2 cm,每拉伸一次测量一次时域反射行数据,所建模型对拉伸位置距起始端的距离值最大误差为2%。实验结果说明提出的测量方法能够对螺旋平行传输线的拉伸量和拉伸位置进行准确预测,该方法解决了点式测量“测处未变,变处未测”的不足,并具有比光纤测斜方法更大的测量范围。
Aiming at the shortage of monitoring methods of geological disasters caused by the deformation of rock and soil such as landslides and debris flow, a new method of geotechnical deformation measurement is proposed. This method is a kind of deformation formed by the combination of parallel transmission lines and time-domain reflection Distribution Measurement Technology. Design deformation measurement and distribution of distributed calibration system, the use of the system of stretching devices were 162 cm helix overall stretch and 500 cm helix positioning and stretching, while using the system of time-domain reflectors on the stretched The spirals were measured and two sets of measurements were modeled using partial least squares. The whole spiral of 162 cm was stretched centimeter-centimeter to 195 cm, and the time-domain reflectance data was measured every 1 cm. The maximum error of the prediction value of the model was 0.3%. The 500 cm helix was stretched 2 cm every 10 cm from the beginning to the end, and the time-domain reflectance data was measured once per stretch. The maximum error of the distance between the model and the starting point was 2% . The experimental results show that the proposed method can accurately predict the tension and tensile position of the helical parallel transmission line. This method solves the shortcoming of point measurement, “the test point is unchanged and the test point is not changed” Fiber Optic Inclinometer method for greater measurement range.