Study on the Accuracy of Fracture Criteria in Predicting Fracture Characteristics of Granite with Different Occurrence Depths

Chenbo Liu, Gan Feng (), Hongqiang Xie (), Jilan Wang, Zhipan Duan, Ye Tao, Gongda Lu, Huining Xu, Yaoqing Hu, Chun Li, Yuefei Hu, Qiuhong Wu and Lu Chen
Additional contact information
Chenbo Liu: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
Gan Feng: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
Hongqiang Xie: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
Jilan Wang: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
Zhipan Duan: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
Ye Tao: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
Gongda Lu: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
Huining Xu: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
Yaoqing Hu: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Chun Li: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Yuefei Hu: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Qiuhong Wu: Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan University of Science and Technology, Xiangtan 411201, China
Lu Chen: School of Civil Engineering, Changsha University of Science & Technology, Changsha 410000, China

Energies, 2022, vol. 15, issue 23, 1-17

Abstract: The fracture network of a deep geothermal reservoir forms the place for heat exchange between injected fluid and rock mass with high temperature. The fracture resistance ability of reservoir rocks will affect the formation of fracture-network structure, heat exchange and transmission characteristics, and reservoir mechanical stability. However, there are few reports on the fracture toughness and trajectory prediction of geothermal reservoirs with different depths. In this paper, the modified maximum tangential stress criterion (MMTS) is analyzed. The results show that the experimental data are significantly different from the theoretical estimate of MMTS under the influence of different occurrence depths. It is found that the fracture process zone (FPZ) seriously affects the accuracy of predicting fracture initiation angle and mixed-mode (I+II) fracture toughness by MMTS. The FPZ value, considering the influence of different occurrence depths, is modified, and the accuracy of MMTS in predicting the fracture mechanical characteristics of granite is improved. In addition, the mechanical test results show that the Brazilian splitting strength ( σ t ) of granite fluctuates increase with the increase in temperature. With the increase in deviatoric stress, the Brazilian splitting strength and the Brazilian splitting modulus of rock show a trend of first increasing, then decreasing, and then increasing.

Keywords: rock mechanical properties; MMTS; geothermal development; geothermal reservoir; different depth of occurrence (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

Downloads: (external link)
https://www.mdpi.com/1996-1073/15/23/9248/pdf (application/pdf)
https://www.mdpi.com/1996-1073/15/23/9248/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:15:y:2022:i:23:p:9248-:d:995167

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().