小浪底水库1~#滑坡非饱和土土-水特性试验研究

通过小浪底1#滑坡非饱和土三轴试验对非饱和土土-水特性及围压对基质吸力的影响进行分析.结果表明:基质吸力随体积含水率的增大而连续减小;天然含水率非饱和土工程性质受含水率的影响很大;相同体积含水率试件的基质吸力随围压的增大而非线性减小,含水率同基质吸力之间的关系是连续的.利用多项式函数模型对土-水特征曲线进行拟合并建立土-水特征方程,同时探讨了土-水特征曲线与强度之间的关系并依此建立强度公式.

Experimental Study on the Soil-water Characteristic of Unsaturated Soil of 1# Landslide in Xiaolangdi Reservoir

SWCC and the influence of confining pressures on matrix suction were analyzed by the triaxial test of unsaturated soil of 1# landslide in Xiaolangdi reservoir.The results indicated that along with volume moisture content increasing, the matrix suction continuously reduced.The influence of the moisture content on the characteristic of unsaturated soil was very great under the natural moisture content;the matrix suction along with confining presses increasing showed the nonlinear decreases under the same volume moisture content,the relation of moisture content and matrix suction was continuous.The fitting to the SWCC and the establishment soil-water secular equation were carried on using the polynomial function model,and simultaneously discussed the relation between the SWCC and the strength,and the strength formula of unsaturated soil was established depending on it.