Articles

The Safety Coefficients Determination for Shear Strength Reduction Method Based on Orderly Clustering

  • LIU Aihua;WU Junping;MA Chunde
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  • School of Resources and Safety Engineering, Center South University, Changsha 410083, China

Received date: 2012-12-31

  Revised date: 2013-01-25

  Online published: 2013-04-28

Abstract

In order to accurately obtain the mutation point of displacement-reduction coefficient curve when using shear strength reduction method, the method of orderly clustering analysis is brought in for the safety coefficient determination. First, the strength reduction method and criterions of instability are introduced. In view of the system model changes before and after the mutation breakdown point, especially displacement and plastic strain increase sharply, the orderly clustering analysis is used to find out the mutation point. Since conventional Fisher optimal segmentation is not applicable to the progressive trend sequence, by integrating the regression clustering thought, using fitting a polynomial as clustering center, the sum of squared residuals as regression class diameter, a new orderly regression clustering method is set up. Based on the method, the displacement-reduction coefficient sequence is divided into a stable segment and a buckling segment, therefore the mutation point is able to be ascertained, and the corresponding reduction factor is the safety factor of the system. The typical examination question of EX1(a) from ACDAS is used to prove the feasibility of the method, the result for the method is consistent with that for solve fos method of Flac3D and closes to the standard answer. Finally, a discriminant of the system state is established, it is more convenient and practical.

Cite this article

LIU Aihua;WU Junping;MA Chunde . The Safety Coefficients Determination for Shear Strength Reduction Method Based on Orderly Clustering[J]. Science & Technology Review, 2013 , 31(12) : 75 -79 . DOI: 10.3981/j.issn.1000-7857.2013.12.013

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