###### Abstract
[22] employed Integrated Fiber Optical Sensing Technology (IFOST) to test the surface as well as the deep deformation of the slope by embedding the sensing fibers into the soil by boreholes. [PERSON] et al. [23] developed a series of FBG-based transducers that include inclination, linear displacement, and differential pore pressure sensors for comprehensive evaluation of slope stability and presented cases of field monitoring using the FBG sensor arrays. [PERSON] et al. [24] applied FBG technology in a traditional inclinometer, proposed a method to calculate displacement based on wavelength change, and used this method for the safety monitoring of the right side slope in the section ZK56 + 860\(\sim\)ZK56 + 940 of Longyong Expressway. [PERSON] et al. [25] proposed a fiber Bragg grating-based monitoring and warning system for expressway slopes, and the four-level early warning method based on statistical analysis was introduced, characterized by four different displacement rate ranges. [PERSON] et al. [26] investigated internal deformation and the failure of a centrifuge model slope with horizontally and vertically embedded FBG arrays. [PERSON] et al. [27] designed a real-time monitoring system based on FBG technology for the Majiagou landslide, which records the displacement at the deeper sliding surface, together with the rainfall, water level, pore water pressure, and temperature, and according to the analysis of these data, the stability evaluation of the slope was carried out. [PERSON] et al. [28] designed an inclinometer using fiber Bragg grating to measure the internal displacement of the slope and carried out field monitoring suitability tests. [PERSON] et al. [29] implemented a fiber Bragg grating (FBG) sensors array into the deep unconsolidated layer to realize long-term ground monitoring. [PERSON] et al. [30] fabricated an in-place FBG-based inclinometer to determine the deformation movement of a slope. [PERSON] et al. [31] embedded the ultra-weak fiber Bragg grating in the boreholes for monitoring and determined the range of plastic zone for each borehole according to the monitoring results. In this paper, the engineering geological profiles were acquired based on 2D inversion maps of the high-density resistivity method combined with geologic exploration data to determine the location of potential sliding surfaces and areas of weakness. Then, the slope finite element numerical models were established to analyze the deformation and damage characteristics, and the location and shape of the sliding surface of the slope were obtained. Finally, the specific location of the monitoring system was confirmed based on the results of the above analysis, and the FBG strain detection piles were deployed to monitor the deformation of the deep stratigraphy. Interpretation of Engineering Geologic Structures of Slope Based on 2-D Inversion Maps of High-Density Resistivity  
The Yuanyang-Luchun Secondary Highway is located in the southwest of Honghe Prefecture, Yunnan Province, and runs from northeast to southwest, the geological working slope is situated between highway miles K77 + 120\(\sim\)K77 + 215. The slope is located south of the Tropic of Cancer and has a subtropical climate with no snow throughout the year; the average temperature for many years is 16.9 \({}^{\circ}\)C\(\sim\)16.44 \({}^{\circ}\)C, respectively. The rainy season is mostly concentrated from May to September, with April, October, and November as the flat water period and the remaining four months as the dry season; the average precipitation over the years is 1450.89\(\sim\)2108.99 mm. The previous geological survey showed that the stratigraphy is composed of a Quaternary (\(Q_{4}^{dl+el}\)) slope residual layer, Triassic (\(T_{3}g\)) upper mudstone, and Indosinian di diorite. The slope residual layer consists of yellow-brown clay and sandy clay with 20\(\sim\)40% gravel; the gravel is less than 6 cm in diameter, 5\(\sim\)7 cm thick, and composed of mudstone fragments and diorite fragments.