粉细砂土填筑压实技术试验研究

通过室内及现场试验,对粉细砂土物理力学性质和压实工艺进行研究,结果表明:粉细砂土颗粒均匀集中,通过增加单位击实功的方法不能有效提高粉细砂土的最大干密度;粉细砂土对较高含水率具有很强的敏感性,且最优含水率右侧强于左侧;粉细砂土压缩至稳定所用时间很短,碾压过程较为省时;依靠增大碾压压力来提高粉细砂土压实度的方法不可行;粉细砂土的抗剪强度峰值随法向压力增大而提高;总结了粉细砂土有约束碾压的技术参数。

Experimental Study on Compaction Technology of Silty Sand Embankment

Physical and mechanical properties of silty sand and its compaction process are studied through indoor and field tests. The results show that silty sand particles are uniform; the method of increasing unit compaction cannot improve the maximum dry density of silty sand effectively; silty sand is sensitive to higher moisture content,and the optimum moisture content of the right side of is more sensitive than that of the left; the time from compression to stability is short and the rolling process of silty sand is relatively time-saving; increasing compaction pressure to improve silty sand's compactness is not feasible; and the peak of silty sand shear strength increases as the normal pressure increases. This paper also summarizes the technical parameters of compaction with constraints.