三峡库区滑坡土石混合体与桩的接触面力学特性试验研究

 以库区典型堆积层滑坡为工程背景，开展一系列不同的含水率、含石量及剪切速率的室内大型直剪试验，探讨不同试验条件下抗滑桩与土石混合体接触面力学特性的变化特征和规律，建立抗剪强度参数与含水率、含石量之间的函数关系。试验结果表明，接触面的抗剪强度、黏聚力和内摩擦角随着含水率的升高而减小，而黏聚力减小趋势在土体饱和时趋于平稳。随着含石量的增大，桩土接触面抗剪强度及内摩擦角则呈现出先减小后增大的抛物线型变化趋势，而黏聚力则逐渐减小。此外，剪切速率增大，接触面的抗剪强度参数则显著增大。研究成果可为土石混合体滑坡抗滑桩设计、接触本构和加固工程的长期稳定性分析提供重要依据。

EXPERIMENTAL STUDY OF MECHANICAL PROPERTIES OF INTERFACE BETWEEN PILE AND MACADAM SOIL IN ACCUMULATIVE LANDSLIDE IN THREE GORGES RESERVOIR AREA

Due to the influence of water level change and seasonal rainfall in the reservoir area of Three Gorges,the mechanical properties of interface between anti-sliding pile and macadam soil are very important for the reinforcement design and safety operation of accumulative landslide.Based on a typical macadam soil landslide,a series of shear tests on interface mechanical properties are conducted under the conditions of various water contents,macadam ratios and shear rates.Accordingly,the functional relationship...