工程地质学报2025，Vol.33Issue(3)：812-826,15.DOI:10.13544/j.cnki.jeg.2024-0578
不同酸碱环境下干湿循环对玄武岩力学性能劣化试验研究
EXPERIMENTAL STUDY ON THE DETERIORATION OF BASALT MECHANICAL PROPERTIES UNDER DRY-WET CYCLES IN DIFFERENT ACIDIC AND ALKALINE ENVIRONMENTS
摘要
Abstract
The long-term exposure of slope rock masses to seasonal rainfall cycles leads to intensified weathering and deterioration of their mechanical properties,increasing their vulnerability to landslide hazards.This study con-ducted dry-wet cycle tests on basalt samples saturated in solutions with pH values of 2,4,7,9,and 11,with the number of cycles ranging from 0 to 40,to investigate the impact of acidic and alkaline environments and cyclic dr-ying and wetting on the mechanical characteristics of basalt.Through uniaxial compression tests and scanning elec-tron microscopy(SEM)analyses,the degradation patterns of basalt's mechanical properties under dry-wet cycles across different pH conditions were examined.Furthermore,a damage constitutive model for basalt was developed based on statistical strength theory to quantitatively characterize its progressive deterioration.The results demonstrate that both the compressive strength and elastic modulus decreased sharply with increasing numbers of dry-wet cycles.Under acidic conditions,the uniaxial compressive strength decreased by 59.93％～70.33％;under neutral condi-tions,by 56.93％;and under alkaline conditions,by 53.07％～53.73％after 40 cycles.The reduction in elastic modulus was even more pronounced than that in compressive strength,with the severity of degradation following the trend:acidic＞neutral＞alkaline.However,as the number of cycles increased,the differences in degradation among the various environments gradually diminished.The failure morphology of the rock changed significantly with the in-creasing number of cycles.More severe fragmentation was observed under acidic conditions,while alkaline condi-tions did not exhibit a similar trend.SEM image analysis revealed distinct degradation mechanisms for different pH conditions:a three-stage evolution of defect distribution in acidic environments,a two-stage pattern in alkaline con-ditions,and a logarithmic trend in neutral environments.The damage constitutive model,constructed using the Weibull distribution and statistical strength theory,demonstrated a strong fit to the experimental data.These find-ings provide a scientific basis for evaluating the stability of basalt rock slopes and contribute to landslide hazard pre-vention and mitigation.关键词
玄武岩/干湿循环/酸碱环境/力学性能劣化/微观结构/缺陷占比率Key words
Basalt/Dry-wet cycle/Acid-base environment/Mechanical property deterioration/Microstructure/Defect ratio分类
建筑与水利引用本文复制引用
杨继清,葛子尧,杨继华,陈积普,谢凤玉,申林方..不同酸碱环境下干湿循环对玄武岩力学性能劣化试验研究[J].工程地质学报,2025,33(3):812-826,15.基金项目
国家自然科学基金项目(资助号:11962008,42167022),云南省教育厅科学研究基金项目(资助号:2025Y0543),国家级大学生创新创业训练计划项目(资助号:202310676003).This research is supported by the National Natural Science Foundation of China(Grant Nos.11962008,42167022),Scientific Research Fund Pro-ject of Yunnan Provincial Department of Education(Grant No.2025Y0543)and National College Students' Innovation and Entrepreneurship Train-ing Program Funding Project(Grant No.202310676003). （资助号:11962008,42167022）
