Deep-hole in situ stress measurement method in high-altitude area based on remote sensing technology
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GMGDA 2019
Deep-hole in situ stress measurement method in high-altitude area based on remote sensing technology Cheng Qin 1 & Feng Xu 2,3 & Yudong Zhang 4 & Pinqing Yang 4 & Lei Pan 4 & Gongbin Yan 4 Received: 15 April 2020 / Accepted: 30 July 2020 / Published online: 17 August 2020 # Saudi Society for Geosciences 2020
Abstract In order to improve the understanding of the physical properties of earthquakes and the interior of the earth, a method for measuring deep-hole in situ stress in high-altitude areas based on remote sensing technology is proposed. The area of 2500 m above sea level is selected as the research area of in situ stress measurement in this paper. The digital image of Landsat TM5 (30 m) is used as the main information source, and the spectrum of the visible-shortwave infrared band is 0.38–2.5 um. The information enhancement of TM7-4-2 band is selected to process the clear remote sensing image of the research area. After locating deep boreholes based on remote sensing images, the in situ stress of deep boreholes is measured by the non-elastic strain recovery method. Core samples at five depths of 730 m, 980 m, 1030 m, 1080 m, and 1110 m are extracted and pasted with 18 strain gauges. The principal stress direction is obtained by core orientation, and the stress components are determined by calculating six independent directions of inelastic normal strain and rock’s inelastic strain recovery flexibility. The results are as follows: the direction of maximum horizontal principal stress is 31°~46° and the dominant direction is 36°; the inelastic strain of each strain gauge is positive strain, the curve increases steadily with time, and the initial inelastic strain increases quickly and then slows down, which accords with the law of inelastic strain change. Experiments show that this method can provide a basis for the study of geological conditions at high altitudes. Keywords Remote sensing technology . High-altitude area . Inelastic strain . Deep-hole . In situ stress . Measurement method
Introduction The technology and research of in situ stress measurement in China began in the 1960s. With the active advocacy and support of Professor Li Siguang, the Institute of Geomechanics of This article is part of the Topical Collection on Geological Modeling and Geospatial Data Analysis * Cheng Qin [email protected] 1
Water Environment Monitoring and Forecasting Room, Ecological and Environmental Monitoring Center of Chongqing, Chongqing 401147, China
2
Hydrology Institute, China Coal Research Institute, Beijing 100013, China
3
Hydrology Institute, CCTEG Xi’an Research Institute, Xi’an 710054, China
4
Department of Hydrology and Geophysical Prospecting, China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400039, China
the Chinese Academy of Geological Sciences and the Institute of Crustal Stress of the Seismological Bureau of China have successfully developed the in situ stress testing system based on stress relief (Wang et al. 2018). In the following decades, the in situ
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