太原理工大学学报2024，Vol.55Issue(2)：267-275,9.DOI:10.16355/j.tyut.1007-9432.20220099
不同冷却模式下高温花岗岩力学特性演变规律试验研究
Experimental Study on the Evolution Law of Mechanical Properties of High Temperature Granite under Different Cooling Modes
摘要
Abstract
[Purposes]The mechanical properties of granite in the same high temperature state un-der different cooling modes(thermal shock cooling in water at 20℃ and natural cooling in air at 20℃)are different.[Methods]By using the laboratory self-developed thermal shock fracture experimental platform,uniaxial compression,Brazilian splitting,and variable-angle shearing(45°,55°,65°)were carried out on granite in different temperature states(25-600℃)under two cooling modes.To test its uniaxial compressive strength,stress-strain curve,peak strain,tensile strength,cohesion c,inter-nal friction angle φ and other macro-mechanical parameters.Besides,the evolution of the mechanical properties of high-temperature granite under different cooling modes was studied.[Findings]The re-search results show that:1)the cooling mode has a great influence on the uniaxial compressive strength,tensile strength,and cohesion c,but has little effect on the internal friction angle;2)The mechanical strength of granite at the same high temperature deteriorates more seriously with thermal shock cooling in water at 20℃,and 300℃ is the threshold temperature for the difference between the two cooling modes;3)From 25℃ to 600℃,compared with natural cooling,thermal shock cooling caused compressive strength,tensile strength,and shear strength(cohesive force)deteriorations of granite which are 51.7％,33％,and 27.6％,respectively,showing that the cooling mode affects the mechanical strength of granite in descending order:tensile strength,shear strength,and compressive strength.[Conclusions]The research results can provide test reference for related projects.关键词
高温花岗岩/冷却模式/热冲击/力学特性/演变规律Key words
high temperature granite/cooling mode/thermal shock/mechanical properties/evolution law分类
建筑与水利引用本文复制引用
辛国旭,郤保平,杨欣欣,董赟盛,何水鑫,吴阳春..不同冷却模式下高温花岗岩力学特性演变规律试验研究[J].太原理工大学学报,2024,55(2):267-275,9.基金项目
国家自然科学基金资助项目(51874207) （51874207）
山西省自然科学基金资助项目(201701D121131) （201701D121131）
山西省研究生创新项目(2021Y282) （2021Y282）
