土木与环境工程学报（中英文）2024，Vol.46Issue(6)：44-50,7.DOI:10.11835/j.issn.2096-6717.2023.057
酸性腐蚀花岗岩冲击荷载能量演化试验研究
Experimental study on energy evolution of granite after acid corrosion under impact loading
摘要
Abstract
Chemical corrosion has a degrading effect on the mechanical properties of rock masses.The rock masses in engineering practice is generally facing dynamic impact loading such as drill burst excavation and mechanical rock breaking,moreover,the destruction of rock is essentially a process of energy absorption and dissipation.Therefore,it is of great practical significance to study the energy evolution of corroded rock under impact loading.Dynamic impact tests were conducted on granite specimens after soaking in KHSO4 solutions at 2 different pH values(3 and 5)using the Split Hopkinson Pressure Bar(SHPB)system.Corrosion time was set to 30 and 60 days,and another set of specimens without corrosion was set up as control group,in order to investigate the energy evolution of granite after acidic corrosion under air chamber pressures of 0.15 MPa.The change laws of dynamic stress-strain curve,peak stress,peak strain,and energy absorption rate with pH value and corrosion time were given.It was found that with the decrease of pH value and the increase of corrosion time,the nonlinear stage of dynamic stress-strain curve was compressed,the peak stress and peak strain decreasing.Moreover,the energy absorption rate increased from 37.39%to 52.11%after 60 days of corrosion in solutions of pH=3,indicating that with increase of chemical corrosion,the strength of granite decreased,the deformation ability becoming worse,stress waves consuming more energy as they propagate through the interior of samples and the specimens were more easily damaged.关键词
花岗岩/化学腐蚀/分离式霍普金森压杆/峰值应力/能量吸收率Key words
granite/chemical corrosion/SHPB test/peak stress/energy absorption rate分类
建筑与水利引用本文复制引用
于天煜,周小平..酸性腐蚀花岗岩冲击荷载能量演化试验研究[J].土木与环境工程学报（中英文）,2024,46(6):44-50,7.基金项目
国家自然科学基金(52027814、51839009、42207193) （52027814、51839009、42207193）
中央高校基本科研业务费(2042021kf0058)National Natural Science Foundation of China(Nos.52027814,51839009,42207193) （2042021kf0058）
The Fundamental Research Funds for the Central Universities(No.2042021kf0058) （No.2042021kf0058）
