Lyu Guanji, Zheng Mingxin, Xiong Lu, Liu Zilong, Zhang Hanqiu
College of Transportation Engineering, East China Jiaotong University, Nanchang, Jiangxi 330013, China.
Department of Management Engineering, Fujian Business University, Fuzhou, Fujian 350012, China.
ACS Omega. 2024 Dec 26;10(1):1667-1676. doi: 10.1021/acsomega.4c09569. eCollection 2025 Jan 14.
Coal-bearing soils (CBS), products of coal-bearing strata weathering, are particularly prone to disintegration due to the effects of dry-wet cycles. Static water disintegration tests, environmental scanning electron microscopy (ESEM), and mineral chemical composition analyses were conducted on CBS. The disintegration evolution of CBS is characterized by granularity entropy and is analyzed concerning the disintegration ratio. Furthermore, the disintegration mechanism is examined based on the water-air two-phase flow (WTF) and mineral chemical reactions. Results show a significant exponential relationship between the standard basic entropy (A) and disintegration ratio (D), where the disintegration ratio decreases as the standard basic entropy increases. As the number of dry-wet cycles increases, A initially decreases rapidly before stabilizing, mirroring the variation pattern of the particle size distribution curve and its derived indicators. Illite produces significant short-range hydration repulsion, leading to the formation of additional cracks in CBS. WTF significantly influences disintegration; water intrusion increases air pressure, and the subsequent pressure release plays a critical role in damaging soil structure. These findings are significant for the safety and protection of CBS slope engineering.
含煤土壤（CBS）是含煤地层风化的产物，由于干湿循环的影响，特别容易崩解。对含煤土壤进行了静水崩解试验、环境扫描电子显微镜（ESEM）和矿物化学成分分析。含煤土壤的崩解演化以粒度熵为特征，并结合崩解率进行分析。此外，基于水 - 气两相流（WTF）和矿物化学反应研究了崩解机制。结果表明，标准基本熵（A）与崩解率（D）之间存在显著的指数关系，即崩解率随标准基本熵的增加而降低。随着干湿循环次数的增加，A最初迅速下降，然后趋于稳定，这与粒度分布曲线及其导出指标的变化模式相似。伊利石产生显著的短程水化斥力，导致含煤土壤中形成额外的裂缝。水 - 气两相流对崩解有显著影响；水的侵入增加了气压，随后的压力释放对破坏土壤结构起着关键作用。这些发现对含煤土壤边坡工程的安全与防护具有重要意义。
