充填黄土压缩蠕变特性与湿陷性试验研究

Study on the Filling Loess' Compression-Creep Behavior and the Collapsibility Test

利用美国MTS815岩石力学伺服试验系统，测得充填黄土在0～7．5MPa范围内的σ-ε曲线、压实度-应力曲线以及4种不同应力条件下的蠕变曲线；并根据不同应力条件下黄土的蠕变特征，回归了ησ-σ曲线及其方程。用双线法湿陷试验得到了黄土5种不同埋深条件下的湿陷系数筑与δs荷P的关系曲线，并对压实过程中黄土的湿陷机理进行了分析，总结了黄土的疋峰值δs埋深的关系曲线，得到了其回归方程。结合曹村煤矿的采矿地质条件，计算出了充填黄土的最大下沉量和最终压缩系数，为工程应用提供了依据。

Using the USA MTS815 Rock Mechanics Test System, the σ-ε curve of the loess between compression ratio and stress in 0-7.5MPa, and the creep curves for four different stresses were gained in this experiment. Based on the creep characters of loess under different stresses, the ησ-σeurve and approximate equations were gained. According to the crewel method, the loess＇ collapsibility in five different depths was tested, and the δ, - P curve was obtained; then the collapsible mechanism of the loess was analyzed, the relationship between δ, ＇ s peak value and depth was summarized and the relation expression was also received. These results, combined with the mine geological conditions of the Caocun coal mine in Huozhou Coal--electricity Group, were applied to calculate the most sinking account and the end compression--coefficient of the filling loess. The conclusion offers great help in the engineering use.