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Thermal cracking characteristics and mechanism of sandstone after high-temperature treatment
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  • Weijing Xiao,
  • Guo Yu,
  • Haitao Li,
  • Dongming Zhang,
  • Shujian Li,
  • Beichen Yu,
  • Dongwei Li
Weijing Xiao
Chongqing University
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Guo Yu
PetroChina Southwest Oil and Gas Field Company Exploration and Development Research Institute
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Haitao Li
PetroChina Southwest Oil and Gas Field Company Exploration and Development Research Institute
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Dongming Zhang
Chongqing University
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Shujian Li
Chongqing University
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Beichen Yu
Chongqing University
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Dongwei Li
Chongqing University
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Abstract

To study the thermal cracking characteristics and mechanism of sandstone after high-temperature treatment, the pore size distribution and micromorphology of sandstone were observed by nuclear magnetic resonance and scanning electron microscopy. Then, based on the Weibull distribution theory, a thermal elastic mechanical model of random heterogeneous rock was established for the rock unit, the thermal stress distribution characteristics of sandstone were analysed, and the thermal fracture mechanism of rock was discussed. The results show that the porosities of the samples increased with increasing temperature, and the proportion of large pores increased significantly when exceeded 400 °C. Particularly when reached 1000 °C, thermal cracking was distributed in a complex network. Additionally, different rock units are in different thermal stress states, which leads to the regional differences in the distribution of rock thermal fracture. When exceeded 400 °C, there were obvious thermal cracks near the outer edge that weakened the mechanical properties of rock.

Peer review status:IN REVISION

25 Apr 2021Submitted to Fatigue & Fracture of Engineering Materials & Structures
27 Apr 2021Assigned to Editor
27 Apr 2021Submission Checks Completed
28 Apr 2021Reviewer(s) Assigned
08 May 2021Review(s) Completed, Editorial Evaluation Pending
16 May 2021Editorial Decision: Revise Major