Abstract
The position of the saturated line is an important basis for evaluating the stability of the slope, and the traditional sensors cannot be monitored for a long time because of poor durability and anti-interference. A method for measuring the saturated line with distributed optical fiber temperature measurement technology was proposed, and the one-dimensional and two-dimensional model experiments of measuring the saturated line at three kinds of electron flow (5 A, 10 A, and 15 A) were conducted, and their measuring data were carefully analyzed. The results showed the three stages of the optical fiber temperature difference with time: sudden-rising, fast-rising, and slow-rising. The temperature rising rate and stable temperature difference at the position of the saturated line are between saturated soil and unsaturated soil. The fiber optic temperature increases with the increment of heating electron flow, which also demonstrates stability and repeatability.
Highlights
With the rapid development of society and economy, infrastructures [1–3], including roads, railways, dams, bridges, waterways, etc., are the main investment directions to support the continued prosperity of the economy and the country
Piezometers, pore water pressure gauges, volumetric water contents, and other instruments are being used in the monitoring of the saturated line [14, 15]
Liu and Wang [23] predicted the response of the pore water pressure (PWP) in the soil to the slope stability under heavy rain, and three sets of PWP sensors were used to measure
Summary
With the rapid development of society and economy, infrastructures [1–3], including roads, railways, dams, bridges, waterways, etc., are the main investment directions to support the continued prosperity of the economy and the country These facilities have been placed in complex and changeable environments [4, 5] for a long time, and the failure or collapse caused by the deterioration of their structure may cause casualties and major damage [6]. Cao et al [29] allowed the measurement of soil moisture in saturated and unsaturated zones with a deviation of 0.027 m3/m3 and used the active heating optical fiber method to monitor soil moisture profiles through model experiments. Cheng et al [31] used the distributed optical fiber temperature detection to obtain data from the dam seepage heat laboratory model and used optical frequency domain reflectance (OFDR) technology to monitor temperature, which has high time and space accuracy. 170 sets of optical fiber temperature data are acquired and analyzed
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