浅析介观尺度上砒砂岩与沙复配土结构稳定性的内力作用

Analysis of Soil Internal Forces on the Soil Structural Stability of Amended Mu Us Sand Land with Feldspathic Sandstone and Aeolian Sandy Soil

摘要: 毛乌素沙地治理事关我国西北地区生态环境安全和可持续发展，虽然近年来其沙化趋势得到明显遏制，却并未被彻底扭转，仍面临再次沙化的严峻挑战。新近研究揭示，土壤内部介观尺度上的静电斥力、水合斥力和范德华分子引力的相互作用可能是决定宏观尺度土壤结构稳定或破坏的本质原因。然而，砒砂岩与沙复配提升土壤结构稳定性的内力作用机制及其微观机理仍不清楚。因此，本文概述了和讨论了砒砂岩与沙复配在质地组配和结构改良方面的关键作用，分析了介观尺度上砒砂岩与沙复配土的复合效应和表面电荷效应差异将改变复配土颗粒间相互作用力，进一步影响风沙土结构形成和及其稳定性，并针对砒砂岩与沙复配土结构稳定性的内力作用研究中急需攻克的难题进行了总结和展望。

Abstract: Remediation of the Mu Us Sandy Land’s desertification is very important for Northwest China to maintain ecological and environmental safety and sustainable development. Although the desertification trend of Mu Us Sandy Land has been obviously reversed in recent years, it has not been completely controlled, instead, it may get worse again. Recent studies suggest that the mesoscopic scale interparticle forces, including the electrostatic repulsive force, van der Waals attractive force and surface-hydration repulsive force, may play a crucial role in the stability of soil structure. However, the mechanism of interparticle forces on the stability and micromechanism of with feldspathic sandstone and aeolian sandy soil is still unclear. Therefore, this paper summarizes and discusses the key role of feldspathic and sand composite in texture composition and structural improvement, and analyzes that the difference of composite effect and surface charge effect of feldspathic and sand composite soil on mesoscopic scale will change the interaction between particles of composite soil, further affecting the formation and stability of aeolian sandy soil structure. The paper also summarizes and looks forward to the problems that need to be solved urgently in the study of the internal force mechanism of soil internal forces on the soil structural stability of amended Mu Us sand land with feldspathic sandstone and aeolian sandy soil.