摘要
黄河流经黄土高原携带巨量泥沙入海,并在河口沉积形成黄河水下三角洲。黄土沿黄河流域自西北高原迁移至东部渤海的过程中,其工程性质必然也会发生相应变化。归纳总结近30年来黄河流域地区黄土研究资料,统计不同区域黄土的物理性质、成分、结构特征、力学性质与动力特性,分析黄土从黄土高原到东部渤海发生的变迁。研究结果显示在迁移入海的过程中黄土的容重、含水量变大,可塑性减弱;主要成分仍为粉粒,但黏粒含量增加,砂粒含量减小,于此同时,黄土孔隙也被更好地充填,结构由疏松变紧密,压缩性相应减弱;黄土的抗剪性区域性变化,而抗震性和抗液化强度变大。本研究对深入理解黄土地质灾害机理、科学指导黄土地区工程建设具有重要意义。
Millions of years ago, seemingly boundless sand storms covered northwestern China, which formed loess deposits several hundred meters deep. Some loess was transported thousands of kilometers away through the river system to the coastal area of the Bohai Sea, which generated the Modern Yellow River Delta. The engineering properties of loess changed from Yellow river to the sea. The physical mechanical properties, gradation composition, microstructure and dynamics properties of loess are obtained based on the achievements along the Yellow River in the past 30 years and researches on estuary sediment in the latest 10 years. Analysis of these data shows that the unit weight and water content increased in the process of transported into sea, while the plastic index decreased. The major contents of loess are silt, with little sand and clay. The clay content increased while sand content decreased. Consequently, the void was filled better, and the compressibility of loess reduced. The shear resistance shows big differences at different areas. The earthquake resistance and liquefaction resistance were increased. This paper is of great significance to better understanding the mechanism and prevention of the loess geological disasters.
出处
《工程地质学报》
CSCD
北大核心
2016年第5期941-950,共10页
Journal of Engineering Geology
基金
国家自然科学基金项目(41372287,41272316,41402253)
国土资源部黄土地质灾害重点实验室开放基金项目(KLGLAMLR201501)资助
关键词
黄土
迁移入海
工程性质
空间演变
黄河流域
Loess, From Yellow River in to sea, Engineering properties, Spatial evolution, Yellow River Basin
