Insight into in-situ stress calculation applied in hollow inclusion measurement
YAN Zhenxiong1,2,WANG Peitao1,2
(1. School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China; 2. Key Laboratory of High-efficient Mining and Safety of Metal Mines of Ministry of Education,University of Science and Technology Beijing,Beijing 100083,China)
In order to improve in-situ stress calculation method applied in hollow inclusion measurement,the normal equations are built by least square method to obtain the mathematical expressions of in-situ stress components. Based on the Shengjin′s formulas to have characteristic equation of the stress state,the discriminant for estimating the stress state and calculation method of principal stress are obtained. According to geometric relations among the direction cosine of the principal stress,a method of determining octants of principal stress is given and the calculation formulas of azimuth and dip are deduced. With LabVIEW,a program of in-situ stress calculation is programmed to study the stress state of Xincheng gold mine. The results reveal that the in-situ stress is dominated by horizontal tectonic stress field and the maximum horizontal principal stress is oriented in SE-NW directionto nearly E-W direction.
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