刚果金南部地区矿山湿陷性土形成机理分析

Analysis on formation mechanism of mine collapsible soil in southern DRC

基于工程实际调查结果,采用电子显微镜、岩矿鉴定、现场载荷试验等多种方法,分析刚果(金)南部区域分布湿陷性土的形成原因,探讨其矿山工程性质和湿陷机理。研究结果表明,刚果(金)南部湿陷性土多为新进纪(N)形成的残积类土,属于非黄土类的湿陷性地质结构,发生湿陷的机理主要为固结过程中团粒外覆氧化膜破坏,团粒间胶凝作用减弱以及土颗粒之间发生滑动实现再平衡。本文主要研究刚果地区南部矿山地质结构发展,同时通过地质结构发展过程了解其形成机理,并进行详细分析。

Based on the investigation results of engineering practice,the formation causes of the collapsible soil distributed in the southern region of the Democratic Republic of Congo(DRC)were analyzed by means of electron microscope,rock ore appraisal and field load test,etc.,and the engineering properties and collapsible mechanism of the mines were discussed.The results show that the collapsible soils in the southern Congo are mostly residual soils formed in the Neolithic period(N),belonging to the non-loess collapsible geological structure.The main mechanisms of the collapsible soils are the destruction of the coating oxide film of the aggregates during the consolidation process,the weakening of the cementation between the aggregates,and the sliding between the soil particles to realize the rebalancing.This paper mainly studies the development of mine geological structure in the southern Congo area,and at the same time,through the development process of geological structure to understand its formation mechanism,and carries out a detailed analysis.