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Journal of Sensors
Volume 2015 (2015), Article ID 376498, 7 pages
http://dx.doi.org/10.1155/2015/376498
Research Article

Application of Method for Dynamic Analysis of Additional Strain and Fracture Warning in Shaft Lining

1State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China
2Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
3School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China

Received 15 October 2014; Revised 12 January 2015; Accepted 12 January 2015

Academic Editor: Fei Dai

Copyright © 2015 Guangsi Zhao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In the past few decades, enormous losses have been induced by hundreds of vertical shafts collapse. This study is based on long-term in situ monitoring data of several mines with overburden soil layers in East China in the past six years. modeling based on fractal theory was used to analyze the development of additional strains in shafts by using Hurst exponent. It can be found that from the monitoring results the Hurst effect is significant ranging from 0.5 to 1.0. Its trend also is in good agreement with forward-biased random distribution. Hence, method can be used to predict the additional strain along the shaft lining. In this paper, Hurst exponent shows an irregular phenomenon before cracking. It is proved that Hurst exponent can be used to predicate the progressive failure of shaft lining from abnormal state to normal state. This paper presents the prediction of shaft lining failures using strains measured by embedded strain gauges in the thick overburden soil layers in east China.