Paper Title:
Prediction Method of Coal Fracture Based on Failure Approach Index and Hoek-Brown Criterion
  Abstract

According to Mohr-Coulomb criterion, the yield approach index (YAI) of Hoek-Brown criterion is derived. The rock-mass intact coefficient KV is introduced, and coal failure approach index is defined by combining failure degree. On the basis of logging data and stratified in-site stress model, the failure approach index and yield approach index are calculated in wellbore direction. Based on FAI values, coal fracture degree is divided four grades of A, B, C, D, and coal fracture classification method is proposed. Taking ZP-1 Well in QinShui basin as an example, the distribution regularity of coal fracture degree is predicted by the method. The results indicate that failure approach index of ZP-01 well is between 0.8-1.2; the section of 551-552.7m of coal seam is fractured (grade A), and the rest section of coal seam is regarded as grade B. Through electron microscope to scan coal sample structure, the results agree well with the prediction results, therefore the classification method is reliable. Depending on theory results, computer program is corresponding developed.

  Info
Periodical
Advanced Materials Research (Volumes 383-390)
Chapter
Chapter 20: Metrology and Measurement
Edited by
Wu Fan
Pages
4994-4999
DOI
10.4028/www.scientific.net/AMR.383-390.4994
Citation
X. Wang, L. S. Zhang, X. Z. Yan, "Prediction Method of Coal Fracture Based on Failure Approach Index and Hoek-Brown Criterion", Advanced Materials Research, Vols. 383-390, pp. 4994-4999, 2012
Online since
November 2011
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Price
$32.00
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