铁谢——神堤河段地层土体特性及滩岸稳定分析

在铁谢—神堤河段选择典型部位开展了土体物理力学特性试验,同时探讨了不同含水率状态下土体力学特性的变化规律,并对滩岸稳定性进行了初步分析。结论认为:①粉质黏土、粉质壤土、砂壤土、细砂、中砂、粗砂的摩擦角、干密度均呈依次增大的趋势,压缩系数、液限含水率、孔隙比、天然含水率均呈依次减小的趋势;②土体含水率发生变化时,土体的状态随之而变;③滩岸边界特性、土层结构、水流条件和河床冲淤演变特性等在滩岸崩塌过程中起到了重要的作用,而且这些影响因素在不同时期所发挥的作用也不同。

Analysis on Soil Mass Characteristic and Stability of Floodplain and Embankments of Tiexie-Shendi River Section

It conducts physical mechanics characteristic tests of soil mass selected at typical location of Tiexie-Shendi section.It also discusses the variation law of mechanics feature of soil mass under different percent moisture content condition and makes initial analysis on the stability of floodplain and embankments.The conclusions are that a) the friction angle and dry density of silty clay,silty loam,sandy loam,fine sand,medium sand and coarse sand are in a increase trend successively and the compressibility,percent moisture content of liquid limit,void ratio and natural percent moisture content all in a decrease trend successively;b) the status of soil mass is changed as the percent moisture content of soil mass varied and;c) the boundary characteristic of floodplain and embankments,soil structure,flow condition and evolution characteristics of channel deposition and scouring have played an important function in the process of collapse and the functions of those affecting factors is also different in different periods.