【摘要】 为研究击实能和含水率对压实黄土强度特性的影响,以延安新区某高填方填筑土为研究对象,采用应变控制式直剪仪,将不同含水率、击实能作用下的压实土样分别在垂直压力为100、200、300和400 k Pa下进行直剪试验。试验结果表明:击实能的增大并不能保证土体强度的提高,还要考虑最优含水率的影响;当含水率较低时,抗剪强度随击实能的增大而提高;当含水率较高时,抗剪强度随击实能的增大而降低。黏聚力和内摩擦角表现与抗剪强度相同的变化规律。试验结果可为公路、路基及建筑物地基的填筑施工提供依据。更多还原

【Abstract】 In order to study the effect of compaction energy and water content on the strength characteristics of compacted loess,a high-filled soil in Yan’an new area was taken as the research object,and the strain-controlled direct shear instrument was used to treat different water content and compaction energy. Compacted soil samples were tested for direct shear at vertical pressures of 100,200,300 and 400 k Pa. The test results show that the increase of compaction energy does not guarantee the improvement of soil strength,but also the influence of optimal water content. when the water content is low,the shear strength increases with the increase of compaction energy;When the water content is high,the shear strength decreases as the compaction energy increases. The cohesion and internal friction angles have the same variation as the shear strength. The test results can provide a basis for the filling of roads,roadbeds and building foundations.更多还原