Work

Study on thermal crack characteristics of granite in Shandong Province, China under different temperatures and heating/cooling treatments

Year: 2024

Type: article

Abstract: In order to delve deeper into the mechanism of thermal crack of rock, the crack initiation characteristics, extended procedure, and crack network morphology of rock under different temperatures and heating/cooling paths was qualitatively and quantitatively analyzed, the thermal crack mechanism was also analyzed from the perspectives of microstructure, thermal stress, and mineral crystal properties. The research results show that 200-300℃ and 600℃ are two obvious mutation points of water-cooled samples, while the mutation points of air-cooled samples is around 600℃. The initiation positions of thermal cracking under all temperature paths are relatively similar, with intergranular crack located between particles at the edge of the sample or intercrystalline crack in the middle of feldspar or quartz aggregates. Slow heating and rapid cooling contribute to the complexity of the thermal crack network, and rapid heating can form larger sized thermal cracks. The process of thermal cracking can be divided into three stages: the development of small cracks, the joint development of main cracks and small cracks, and the connection of cracks into a network structure. The thermal cracking mechanism is difference of the expansion and thermal conductivity between different crystals.

Source: Case Studies in Thermal Engineering

DOI: 10.1016/j.csite.2024.105127

Authors: Weiqiang Zhang, Wei Li, Xin Zhang, Wei Qiao, Yangzhou Wang, Jinyu Xie

Institutions: China University of Mining and Technology, China University of Petroleum, East China

Language: English

Topic: Rock Mechanics and Modeling

Subfield: Mechanics of Materials

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,210

Funders: National Natural Science Foundation of China, China University of Mining and Technology, Priority Academic Program Development of Jiangsu Higher Education Institutions