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利用改进的非饱和土三轴仪进行了小浪底水库1#滑坡非饱和土三轴试验,着重对围压对基质吸力的影响、非饱和土强度及基质吸力对它的影响进行研究,结果表明:基质吸力对非饱和土抗剪强度有增强作用,主要体现为对总内聚力的增强,对内摩擦角影响极小,且其强度参数Φb不是常量。应用最小二乘法对基质吸力与总内聚力实测曲线进行拟合并结合非饱和土强度理论建立了实用抗剪强度公式,用具体函数来明确基质吸力对强度的影响。
The triaxial test of unsaturated soil in landslide # 1 of Xiaolangdi Reservoir was carried out by using improved triaxial apparatus of unsaturated soil. The influence of confining pressure on the matrix suction, the strength of unsaturated soil and the influence of matrix suction were studied. The results show that: The matrix suction enhances the shear strength of unsaturated soils, which is mainly reflected in the enhancement of the total cohesion and the minimal impact on the internal friction angle, and its strength parameter Φb is not constant. The least square method was used to fit the measured curves of matrix suction and total cohesion, and combined with the strength theory of unsaturated soil, a practical shear strength formula was established. The concrete function was used to determine the influence of matrix suction on the strength.