工程地质学报2024，Vol.32Issue(6)：1988-2002,15.DOI:10.13544/j.cnki.jeg.2023-0303
贺兰口岩画载体薄厚互层浅变质砂岩差异损伤特征与机制研究
STUDY ON THE DIFFERENTIAL DAMAGE CHARACTERISTICS AND MECHANISM OF THIN AND THICK INTERBEDDED LOW-GRADE META-MORPHIC SANDSTONE IN HELANKOU ROCK PAINTING CARRIER
摘要
Abstract
In view of the frequent occurrence of geological disasters such as slope debris flow and dangerous rock in the rock painting area of Helankou,through the detailed investigation and qualitative analysis of the disaster devel-opment characteristics and lithologic conditions in the region,it is concluded that the problem of frequent geological disasters is caused by the differential damage of thin and thick interbedded low-grade metamorphic sandstone.Based on previous research,freeze-thaw and dry-wet cycle experiments of two kinds of rocks in different chemical environ-ments were set up,and the damage mechanism was preliminarily revealed.The results showed:The mass loss rate,the attenuation rate of cohesion and internal friction angle,the growth rate of the number and area of pores,the conversion rate of feldspar minerals,and the change rate of damage variable of thin low-grade metamorphic sand-stone samples are significantly higher than those of thick low-grade metamorphic sandstone samples under any same deterioration conditions.The reason for the difference is that the thin low-grade metamorphic sandstone has a high content of feldspar minerals,the existence of latency layers,and interstitial material that is mainly argillaceous.The joint action of these three aspects makes the intensity of mineral hydrolysis and dissolution reaction and the degree of cementation failure of thin low-grade metamorphic sandstone significantly higher than that of thick low-grade met-amorphic sandstone under the same deterioration conditions.关键词
薄厚互层/损伤特征/损伤变量/差异风化/隐伏层面Key words
Sandstone interbeds/Damage feature/Damage variable/Differential weathering/Latency layer分类
天文与地球科学引用本文复制引用
崔凯,陈一凡,吴国鹏,裴强强..贺兰口岩画载体薄厚互层浅变质砂岩差异损伤特征与机制研究[J].工程地质学报,2024,32(6):1988-2002,15.基金项目
国家自然科学基金项目(资助号:42107206,U22A20599),中国博士后科学基金项目(资助号:20023MD734145),甘肃省自然科学基金项目(资助号:22JR5RA292).This research is supported by the National Natural Science Foundation of China(Grant Nos.42107206,U22A20599),China Postdoctoral Science Foundation(Grant No.20023MD734145)and the Natural Science Foundation of Gansu(Grant No.22JR5RA292). （资助号:42107206,U22A20599）
