南水北调中线工程第三系软岩工程地质性质研究

描述了南水北调中线工程中第三系软岩的典型地层剖面,论述了第三系软岩的沉积韵律建造和沉积旋回特征;运用颗粒分析、X射线衍射分析和差热分析,论述了软岩的粒度成分、主要矿物成分;通过物理力学实验,获得了软岩水理性、膨胀性和主要力学性质指标,证实第三系软岩具有与第四系松散土体相似的工程地质性质,属于极低强度的岩石.第三系软岩工程地质性质的研究是进行软岩工程设计的基础,具有重要的工程意义.

STUDY ON ENGINEERING GEOLOGICAL PROPERTIES OF TERTIARY WEAK ROCK OF THE MIDDLE ROUTE PROJECT OF SOUTH-TO-NORTH WATER TRANSFERS

The main irrigation canal of The Middle Route Project of South-to-North Water Transfers (MRP),63.25 km long, consists of Tertiary weak rock or Tertiary claystone and Quaternary clay. The engineering geological property of the Tertiary weak rock is one of the most important engineering problem for MRP. This paper described the typical stratum section of Tertiary weak rock and discussed its sedimentary rhythm and sedimentary cycle. It also studied its grain size and main mineral by means of grain size analysis, X-ray analysis and different heat analysis. Moisture content, expansiveness and main mechanics index of the weak rock were obtained by physical and mechanic experiment,which testified that the Tertiary weak rock has similar engineering geological properties to the Quaternary clay and is very low in strength.Therefore, it is very important for MRP.