矿业科学学报2024，Vol.9Issue(3)：351-360,10.DOI:10.19606/j.cnki.jmst.2024.03.004
热损伤花岗岩力学劣化特性及损伤演化规律研究
Study on the mechanical degradation characteristics and damage evolution of thermally damaged granite
摘要
Abstract
The high geothermal environments encountered in deep mineral mining induce thermal damage to rocks,which can trigger geotechnical disasters in deep engineering projects.Therefore,explo-ring the degradation characteristics of rock mechanical properties and the damage evolution laws after high-temperature exposure is of significant importance for rock engineering in deep high-geothermal en-vironments.By subjecting granite to the temperature range from ambient to 1200 ℃ and conducting macro-microscopic studies using optical microscopy,the degradation characteristics of Young's modulus and compressive strength in granite samples post various high-temperature treatments were investigated.Additionally,an analysis was performed on the internal cracks and damage evolution in thermally damaged granite from a microscopic perspective.The experimental results demonstrate that high-temperature treatments significantly reduce the mechanical properties of granite.The granite's com-pressive strength and Young's modulus decrease with increasing treatment temperatures,and the extent of crack development increases with temperature.The mechanic cal properties of granite are highly cor-related with the development of internal crack structures.There is a power function relationship between the crack density and compressive strength in granite after different temperature treatments,indicating that crack density can effectively reflect the extent of thermal damage in granite.关键词
高温处理/热损伤/裂纹密度/抗压强度Key words
high-temperature treatment/thermal damage/crack density/compressive strength分类
矿业与冶金引用本文复制引用
周韬,范永林,陈家嵘,周昌台..热损伤花岗岩力学劣化特性及损伤演化规律研究[J].矿业科学学报,2024,9(3):351-360,10.基金项目
国家自然科学基金(52274090,52192625) （52274090,52192625）
广东省自然科学基金(2022A1515010827) （2022A1515010827）
深圳市自然科学基金(JCYJ20210324093400001) （JCYJ20210324093400001）
广东省"珠江人才计划"引进创新创业团队(2019ZT08G315) （2019ZT08G315）
