不同压力作用下重塑黄土的固结特性

一般认为,固结系数随固结压力的增大而绝对减小,但这种认识在特定条件下具有一定的片面性。基于时间对数法和时间平方根法,对重塑黄土常规固结试验结果中的固结系数、密度进行了对比研究,并给出了结构度的概念。两种方法的计算结果表明,重塑黄土的固结过程是一个渐变过程,在不同压力作用下固结系数的变化呈震荡式衰减而非单调递减。土体固结系数受荷载和初始孔隙率这两个主要因素的影响,而并非只取决于荷载的大小。由时间对数法和时间平方根法计算得到的固结系数变化趋势和幅度并不完全一致。土体结构度曲线较好地反映了土体的固结特性。

Consolidation Properties of Remolded Loess under Different Pressures

It is generally thought that the coefficient of consolidation is absolutely reduced with the increasing of consolidation pressure.To illustrate the prejudice under certain conditions,based on the time square root method and time logarithmic method,the contrast study was made on the consolidation coefficient and density of remolded loess derived from consolidation test results,and then the conception of structuredness is defined.The results from the two approaches show that the consolidation of remodeling loess is gradual,and the changing regulation of the consolidation coefficient is the concussed attenuation nor the gradual attenuation under different pressures.The major factors influencing the consolidation coefficient of remolded loess are the initial porosity and loading,not only the loading.The changing trend and magnitude of the consolidation coefficient from time square root method and time logarithmic method are not same.The curve of structuredness could better describe the consolidation properties of remolded loess.