宁淮高速公路改良膨胀土压实特性研究

宁淮高速公路有90多km的路段通过膨胀土地区，路堤用石灰改良膨胀土填筑．为指导施工和控制填土质量，研究了最大干密度试验方法．结果表明，不同制样过程的石灰改良膨胀土标准击实试验获得的最大干密度有明显差别，其中湿法击实试验的试样含水率变化过程与现场石灰改良土的含水率变化过程相同．因此，工程建设只能用湿法获得的最大干密度作为压实度控制标准．

Study on compaction characteristics of improved expansive soil of Ninghuai Expressway

There are more than 90km of expansive soil foundation along the Ninghuai Expressway, and the embankment of the expressway is constructed with the improved lime expansive soil. For guidance of construction and assurance of quality of soil compaction, a study was performed on the test method for the maximum dry density. Standard compaction tests showed that the maximum dry densities of the improved lime expansive soils with the samples made by different processes were quite different, while the variation of the moisture content of the samples from wet compaction tests was the same as that of the field improved lime soil. Therefore, only the maximum dry density obtained by wet compaction can be used as a criterion for control of compaction ratio in practical projects.