【摘要】 为探究不同结构类型的粗粒土所表现的强度特征,采用室内直剪仪对不同结构类型粗粒土进行了直剪试验,推导了不同结构类型粗粒土的剪应力-剪切位移曲线变化规律,得出了不同结构类型粗粒土的抗剪强度.通过对抗剪强度-正应力曲线进行分析,分析不同结构类型粗粒土的强度指标.试验结果表明:充填结构粗粒土试样内摩擦角最小,嵌合结构、骨架密实结构内摩擦角逐渐增大,而骨架松散结构内摩擦角又发生减小的趋势.粗粒土4种结构类型中,骨架密实结构具有最大的抗剪强度值,研究结论有助于提高建筑施工中的稳定性.更多还原

【Abstract】 In order to explore the strength characteristics of coarse soil with different structure types, the direct shear tests of coarse soil with different structure types were carried out by means of indoor direct shear apparatus, the shear stress-shear displacement curves of coarse soil with different structure types were derived, and the shear strength of coarse soil with different structure types was obtained. Through the analysis of shear strength-normal stress curve, the strength indexes of coarse soil with different structure types were analyzed. The results show that the friction angle of coarse soil samples with filling structure is the smallest, and the friction angle of chimeric structure and skeleton compact structure increases gradually, while the friction angle of loose skeleton decreases. It is concluded that among the four structure types of coarse grained soil, the skeleton compact structure has the maximum shear strength value, which is conducive to improving the stability of construction.更多还原