Faculty of Public Safety and Emergency Management, Kunming University of Science and Technology
Faculty of Land and Resources Engineering, Kunming University of Science and Technology
Key Laboratory of Geological Disaster Risk Prevention and Control and Emergency Disaster Reduction of Ministry of Emergency Management of the People's Republic of China, Kunming University of Science and Technology
Key Laboratory of Early Rapid Identification and Prevention and Control of Geological Diseases in Traffic Corridor of High Intensity Earthquake Mountainous Area of Yunnan Province, Kunming University of Science and Technology

为探讨富水环境下强–中风化硅质板岩的吸水特性及吸水过程微观演化规律,以玉溪至楚雄段国家高速公路旧寨隧道中的强–中风化硅质板岩为研究对象,开展浸水试验、电镜扫描试验和X射线衍射试验。试验结果表明:富水环境下强–中风化硅质板岩吸水过程可分为急速吸水阶段(0~2h)、缓速吸水阶段(2~24h)和平衡吸水阶段(超过24h)等3个阶段。急速吸水阶段,岩石结构变得较为松散、孔隙及微裂隙逐步延伸发展;缓速吸水阶段,胶结物溶解、脱落,岩石结构进一步松散、孔隙及裂隙进一步发育,逐渐形成显著的贯穿性裂隙;动态平衡吸水阶段,岩石结构松散程度、孔隙及裂隙发育程度基本达到稳定状态。强–中风化硅质板岩主要矿物组成为石英和黏土矿物,随着浸水试验的进行,石英相对含量增加,黏土矿物含量不断减小;伊利石、伊蒙混层等黏土矿物遇水极不稳定,既能与水发生化学反应,转化成石英和其他黏土矿物,又能与水发生物理反应,表现出膨胀、破碎和分解等特性。研究成果可为开展强–中风化硅质板岩吸水软化特性的理论研究提供参考。

To study the water absorption characteristics and microscopic evolution law of strongly and moderatelyweathered siliceous slate under water-rich environment, the immersion test, scanning electron microscope test and X-ray diffraction test were conduced on the strongly and moderately weathered siliceous slate in Jiuzhai Tunnel of Yuxi-Chuxiong National Expressway. The results show that the water absorption process of strongly and moder-ately weathered siliceous slate under water-rich environment can be divided into three stages: rapid water absorp-tion (0–2 hours), slow water absorption (2–24 hours) and dynamic equilibrium water absorption (more than 24 hours). In the stage of rapid water absorption, the rock structure becomes loose, and pores and microcracks gradu-ally extend and develop. During the slow water absorption stage, the cement dissolves and falls off, and rock fur-ther loosens, producing further pores and cracksand forming obvious penetrating cracks gradually. In the stage of dynamic equilibrium water absorption, the looseness of rock structure and the development of pores and fratures basically reach a stable state. The main mineral components of strongly and moderately weathered siliceous slate are quartz and clay minerals. In water immersion test, the relative content of quartz increases, but clay minerals decrease. Clay minerals, such as illite and illite-montmorillonite mixed layer, are extremely unstable when ex-posed to water. They can not only react chemically with water and transform into quartz and other clay minerals, but also react physically with water, showing the characteristics of swelling, crushing and decomposition. The research results can provide reference for the theoretical research of water absorption and softening of strongly-moderately weathered siliceous slate.

云南省阿瑟夫·汉院士工作站资助项目(202105AF150076);云南省重点研发计划资助项目(202003AC10002);云南省基础研究计划面上资助项目(202001AT070043)

1试验方案
1.1试样
1.2浸水试验
1.3强–中风化硅质板岩吸水强度试验
1.4扫描电镜(SEM)试验
1.5 X射线衍射(XRD)试验
2试验结果分析
2.1浸水试验结果
2.2强–中风化硅质板岩吸水强度试验结果
2.3 SEM试验结果
2.4 XRD试验结果
3分析与讨论
4结论

杨志全, 李飞洋, 甘进, 等. 富水环境下强–中风化硅质板岩吸水特性及微观演化规律[J]. 采矿与岩层控制工程学报, 2024, 6(1): 013036.

YANG Zhiquan, LI Feiyang, GAN Jin, et al. Water absorption behavior and its micro-evolution law of strongly-moderately weath-ered siliceous slate under water-rich environment[J]. Journal of Mining and Strata Control Engineering, 2024, 6(1): 013036.