河北地区土水特性曲线试验及数据库研究

Study on the tests of soil-water characteristic curves and the database in Hebei

非饱和土土水特性试验是获取非饱和土力学参数的重要途径,但由于耗时过长,严重影响着非饱和土理论的实际应用。本文利用新型土水特性曲线压力板仪,对河北省范围内三处典型地区的土质进行了土水特性曲线室内试验,分析研究了土质、埋深与孔隙率对土水特性曲线的影响。在此基础上构建了河北地区土水特性曲线数据库,通过数据库可以快捷地得到相应地区同类土层的土水特性曲线参数,为快速获取非饱和土力学参数提供了途径。

The important parameters for unsaturated soil could be obtained from the results of soil-water characteristic curves （SWCC） tests. Due to the long time consuming of SWCC tests, the application of the unsaturated theory becomes difficult. By using the new-made volumetric pressure plate extractor, the tests of SWCC for unsaturated soil from three typical places in Hebei province are carried out. The effects of depth, the types of soil and the void ratio on the SWCC are investigated. Based on these tests, the database of SWCC for Hebei area is developed, by which the parameters of SWCC could be easily obtained. It is shows that the database nrovides the new way to quickly obtain the main parameters for unsaturated soil.