期刊论文

Study on Mechanical Properties and Damage of Sandstone under Acidic Conditions and Freeze-thaw Cycles

中文

金属矿山

1001-1250

2023

3

94-99

10.19614/j.cnki.jsks.202303012

水利部土石坝破坏机理与防控技术重点实验室开放基金项目(编号:YK319008) 国家自然科学基金青年基金项目(编号:51708273) 湖南省教育厅项目(编号:20C1608)。

本校为第一机构

为研究水化学—冻融循环耦合作用下砂岩力学特性变化及损伤劣化规律，通过水化学溶液浸泡和冻融循环作用获得不同损伤程度的砂岩试样，再进行单轴压缩试验，分析其力学特性，并通过SEM扫描电镜从微细观角度分析砂岩损伤劣化机理。研究结果表明：①随着冻融循环次数增加，砂岩在酸性溶液下的纵波波速衰减程度与质量损失率较中性溶液下更大，且酸性溶液pH值越低响应幅度越大；②峰值应力与冻融循环次数成负相关，与浸泡溶液pH值成正相关，砂岩呈现出由脆性向延性转化的趋势；③从微细观结构角度分析得出砂岩损伤劣化是交替进行并不断积累的；④以弹性模量定义砂岩损伤变量，拟合建立损伤变量规律函...

In order to study the change of sandstone mechanical properties and the law of damage and deterioration under the action of hydrochemistry-freeze-thaw cycles,sandstone samples with different damage degrees were obtained by immersion in hydrochemical solution and freeze-...MORE In order to study the change of sandstone mechanical properties and the law of damage and deterioration under the action of hydrochemistry-freeze-thaw cycles,sandstone samples with different damage degrees were obtained by immersion in hydrochemical solution and freeze-th...