A borehole diametric deformation measuring system with multi probes structure based on micro-optical imaging
WANG Chuanying1，WANG Yiteng1，2，HAN Zengqiang1，WANG Jinchao1，2，HU Sheng1，ZOU Xianjian1
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China)
With the development of deep underground space and deep energy exploitation，more and more attention has been paid to the in-situ stress measurement technology of deep rock mass. The testing environment of high temperature and high pressure in deep rock mass is the key to restrict the development of this technology. In this paper，a new micro-optical borehole deformation measurement method with multi probes type is proposed and the corresponding measurement apparatus is developed. With the structure design of the rigid probe and the independent packaging optical measuring device，the system is conducted to solve the problem of the complex high temperature and high pressure environment. In the measurement of the borehole wall deformation，the design scheme of the structure by using the multi probes and the micro optical photography technique for the visualization of the small change of the borehole wall is presented. The system realizes the synchronous acquisition of multiple sets of borehole deformation data with more abundant effective data and higher measuring efficiency. Based on the features of the system，the method of borehole shape measurement is put forward，which breaks through the fixed thinking mode which can only measure the diameter deformation for a long time. It lays the foundation for the new method of in-situ stress measurement based on borehole shape. Through simulation experiments，the feasibility of the principle of the system，the rationality of the structural design，the correctness of the measurement method and the operability of the practical application are verified. Through the study of micro-optical borehole deformation measuring system，a number of key issues including design，principle and method will be solved. A novel measuring device for measuring the deformation of borehole diameter and the shape of borehole is developed providing a new testing technique and method for the in-situ stress measurement in deep borehole.
王川婴1，王益腾1，2，韩增强1，汪进超1，2，胡 胜1，邹先坚1. 触头式显微光学孔径变形测量系统研究[J]. 岩石力学与工程学报, 2018, 37(S2): 4274-4282.
WANG Chuanying1，WANG Yiteng1，2，HAN Zengqiang1，WANG Jinchao1，2，HU Sheng1，ZOU Xianjian1. A borehole diametric deformation measuring system with multi probes structure based on micro-optical imaging. , 2018, 37(S2): 4274-4282.
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2018, Vol. 37 
