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9 results on '"He, Gui-cheng"'

4. A Numerical Research on Crack Process of Gypsum Containing Single Flaw with Different Angle and Length in Uniaxial Loading

Author

Zhang Zhi-jun, Dai Bing, and He Gui-cheng

Subjects
Numerical research, Materials science, Gypsum, Article Subject, Mechanical Engineering, 0211 other engineering and technologies, 02 engineering and technology, engineering.material, 010502 geochemistry & geophysics, Geotechnical Engineering and Engineering Geology, Condensed Matter Physics, 01 natural sciences, lcsh:QC1-999, Stress (mechanics), Mechanics of Materials, Inclination angle, engineering, Composite material, lcsh:Physics, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences, Civil and Structural Engineering
Abstract

To investigate the crack behaviour of rock or rock-like material in uniaxial loading, a series of numerical simulations were conducted on gypsum specimens containing a single flaw with different inclination angle (0°–90°) and length (10 mm–30 mm). Based on the numerical simulations results, the effect of flaw length on peak strength, the CI stress, and the CD stress were investigated with different inclination angles. The results show that the peak strength decreased initially and then increased with increasing of the flaw angle. Meanwhile, the peak strength decreased gradually when the length of the preexisting flaw increased. When the inclination angle was 30°, 45°, and 60°, the reduction degree of peak strength increased with increasing of the flaw length. The CI stress and CD stress not only depend on the inclination angle but also depend on flaw length. Four types of crack were observed in numerical simulations. The present research facilitates increased understanding of crack behaviour of rock under different conditions.

Published
2018

9. PSA-SVM approach for back analysis of displacements and its application.

Author

Liu Yong, Ding De-Xin., He Gui-Cheng, Zhang Zhi-Jun, Liu Yong, Ding De-Xin., He Gui-Cheng, and Zhang Zhi-Jun

Abstract

A method is described for the back analysis of displacements occurring during underground mining based on the support vector machine (SVM) approach optimised using a pattern search algorithm (PSA). A case study is described for a stope in an underground mine in Hunan, China, in which the approach was used to analyse the mechanical properties of the stope and the effect of the stope on ground subsidence. Good agreement was obtained between the numerical calculations and field monitoring results., A method is described for the back analysis of displacements occurring during underground mining based on the support vector machine (SVM) approach optimised using a pattern search algorithm (PSA). A case study is described for a stope in an underground mine in Hunan, China, in which the approach was used to analyse the mechanical properties of the stope and the effect of the stope on ground subsidence. Good agreement was obtained between the numerical calculations and field monitoring results.

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