Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (6): 1795-1802.doi: 10.13278/j.cnki.jjuese.201706202

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Thermal Damage of Granite with Fracture Under Temperature Effect:A Case Study on Beishan Granite in Gansu

Gao Hongmei1, Lan Yongwei2, Zhou li1, Meng Liyan1   

  1. 1. Institute of Architectural Engineering, Heilongjiang University of Science and Technology, Harbin 150022, China;
    2. Institute of Mining Engineering, Heilongjiang University of Science and Technology, Harbin 150022, China
  • Received:2017-03-23 Online:2017-11-26 Published:2017-11-26
  • Supported by:
    Supported by National Natural Science Foundation of China(11402080),National Natural Science Foundation of Heilongjiang Province(QC2014C062) and Open Project of Key Laboratory of Mining Engineering of Heilongjiang Ordinary Higher Education Institutions(2013-KF04)

Abstract: In order to study on thermal damages of detective granite under temperature effect, an analysis on thermal stress of cracked granite was conducted through applying the theories of thermodynamics and damage mechanics. The critical stress formula of thermal damage of cracked granite was derived, further the influence of high temperature on the variation of the thermal elastic ratio of granite was analyzed, and then the thermal damage evolution equation of granite under temperature was established, finally the possible forms of the stress damage surface of granite under temperature were studied. A numerical simulation of the internal structure, crystal element damage, and stress variation of the Beishan defective granite under temperature was carried out. When the temperature rose to 60℃, a significant thermal damage occurred near the cracks of granite, and the damage was small far away from the cracks. When the temperature rose to 120℃, the shear failure characteristics of granite defects were obvious, the thermal damage near crack increased seriously, and the uninterrupted damages appeared obviously away from the defects. Under 120℃, a sudden change came out for the damage amount, the thermal stress, and the cumulative energy. Thereafter, with the increase of temperature to 200℃, the increment of damage is weak. The results show that there is a direct relationship between the damage and the temperature of Beishan granite with defects.

Key words: defective granite, thermal damage, thermal stress, Beishan,Gansu

CLC Number: 

  • TD313
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