文献类型：期刊文献

英文题名：Thermal effect on permeability in a single granite fracture: Experiment and theoretical model

作者：Peng, Huan[1];Zhao, Zhihong[1];Chen, Wei[2];Chen, Yuedu[1];Fang, Jun[3];Li, Bo[4]

机构：[1]Tsinghua Univ, Dept Civil Engn, Beijing, Peoples R China;[2]Hubei Univ Technol, Sch Civil Engn Architecture & Environm, Wuhan, Peoples R China;[3]Univ Calif Irvine, Dept Math, Irvine, CA 92717 USA;[4]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing, Peoples R China

年份：2020

卷号：131

外文期刊名：INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES

收录：SCI-EXPANDED(收录号：WOS:000544101000004)、、EI(收录号：20202008649514)、Scopus(收录号：2-s2.0-85084403083)、WOS

基金：This study was financially supported by the National Key R&D Program of China (No. 2019YFB1504103), the National Natural Science Foundation of China (Nos. 51739006, 51779123, and 51709097), the China Postdoctoral Science Foundation (2019TQ0174, 2019M660652), and the Hubei Provincial Natural Science Foundation of China (2017CFB604). The constructive comments from the two anomyous reviewers are thanked.

语种：英文

外文关键词：Beishan granite; Fracture permeability; Temperature; Coupled thermal-mechanical model

外文摘要：The behavior of fluid flow through rock fractures at varying temperatures is a critical issue in many subsurface geo-energy projects. Previous work has considered the thermal effects on fracture permeability, but not in isolation of the chemical effects as well. Therefore, to quantitatively assess the mechanical influences on fracture permeability, we present results from permeability tests of five cylindrical Beishan granite samples, each with a single artificial fracture, at different temperatures. Three samples were tested at a constant confining pressure of 5 MPa and temperatures of 22 degrees C, 90 degrees C and 150 degrees C for 22 days, to examine creepinduced changes in fracture permeability. Fracture permeability decreases with time until about 10 days, and the eventual magnitudes of fracture permeability reduction are much greater at 90 degrees C and 150 degrees C than at 22 degrees C. Two samples were subjected to three heating cycles (30 degrees C to 150 degrees C) at a constant confining pressure of 5 MPa. Fracture permeability de- creases as temperatures increase from 30 degrees C to 150 degrees C, and then slight changes in permeability occur as the sample is cooled to 30 degrees C. A similar tendency appears in subsequent temperature cycles, while the magnitude of fracture permeability reduction decreases with increasing heatingcooling cycles. A coupled thermalmechanical model considering asperity damage is developed to describe the thermallyinduced changes in fracture perme- ability, which properly predicts the experimental results. The residual deformation of asperities and temperature dependent Young's modulus play an important role in thermallyinduced changes in fracture permeability.