NDLI: A Mesostructure-based Damage Model for Thermal Cracking Analysis and Application in Granite at Elevated Temperatures

Content Provider	Springer Nature Link
Author	Yu, Q. L. Ranjith, P. G. Liu, H. Y. Yang, T. H. Tang, S. B. Tang, C. A. Yang, S. Q.
Copyright Year	2014
Abstract	Thermal stress within rock subjected to thermal load is induced due to the different expansion rates of mineral grains, resulting in the initiation of new inter-granular cracking and failure at elevated temperatures. The heterogeneity resulting from each constituent of rock should be taken into account in the study of rock thermal cracking, which may aid the better understanding of the thermal cracking mechanisms in rock. In this paper, a mesostructure-based numerical model for the analysis of rock thermal cracking is proposed on the basis of elastic damage mechanics and thermal–elastic theory. In the proposed model, digital image processing (DIP) techniques are employed to characterize the morphology of the minerals in the actual rock structure to build a numerical specimen for the rock. In addition, the damage accumulation induced by thermal (T) and mechanical (M) loads is considered to modify the elastic modulus, strength and thermal properties of individual elements with the intensity of damage. The proposed model is implemented in the well-established rock failure process analysis (RFPA) code, and a DIP-based RFPA for the analysis of thermally induced stress and cracking of rock (abbreviated as RFPA-DTM) is developed. The model is then validated by comparing the simulated results with the well-known analytical solutions. Finally, taking an image from a granite specimen as an example, the proposed model is used to study the thermal cracking process of the granite at elevated temperatures and the effects of temperature on the physical–mechanical behaviors of the granite are discussed. It is found that thermal cracks mostly initiate at the location of mineral grain boundaries and propagate along them to form locally closed polygons at the elevated temperatures. Moreover, the effects of temperature on the uniaxial compressive strength and elastic modulus of the granite are quite different. The uniaxial compressive strength decreases consistently with increasing temperature, but there exists a threshold temperature for elastic modulus which starts to decrease as the temperature increases after it exceeds the threshold.
Starting Page	2263
Ending Page	2282
Page Count	20
File Format	PDF
ISSN	07232632
Journal	Rock Mechanics and Rock Engineering
Volume Number	48
Issue Number	6
e-ISSN	1434453X
Language	English
Publisher	Springer Vienna
Publisher Date	2014-12-24
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Digital image processing Mesostructure-based damage model Thermal cracking Granite Geophysics/Geodesy Civil Engineering
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology Civil and Structural Engineering

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