浙江高液限土压缩特性研究

通过室内试验研究,得到浙江高液限土在不同含水率和干密度下的压缩指标。提出了高液限土压缩指标取值方法及标准。针对高液限土压缩特性对含水率较敏感的特点,总结了压缩指标与含水率的关系:含水率在塑限以上,土样难以压实;随着含水率的增大,压缩系数与压缩指数都增大;而液限含水率以下,高液限土的压缩模量随含水率的增加下降趋势较大,含水率大于液限时,则变化平缓;竖向压力大于100 kPa时,Burland方法能较好地对压缩曲线归一化处理,参数e*_(100)、C*_c与w/wL正相关。给出了相关经验式,便于在缺乏试验资料时对浙江高液限土的压缩指标进行快速取值。

Study on compression properties of high liquid limit soil in Zhejiang

Through laboratory tests the compression indexes of Zhejiang high liquid limit soil under different water content and dry density were obtained. The method and standard of high liquid limit soil compression index are put forward,the relationship between strength index, compressibility index and water content is summarized: The greater the liquid limit, the higher the compressibility of the high liquid limit soil, when the water content is more than plastic limit, the soil sample is difficult to compaction, with the increase of water content, the compression coefficient and the compression index increase; But when it is in the liquid limit of water content, the compression modulus of the high liquid limit with the decline of water content is larger, when the water content is greater than the liquid limit, the change is small; When the vertical pressure is greater than 100kPa, the Burland method can be used to normalize the compression curve,the relevant empirical formula is given in this paper, which is convenient for the rapid determination of Zhejiang high liquid limit soil in the absence of experimental data.