用压缩蠕变试验研究高填方体沉降变形

以九寨-黄龙机场104m高填方体为工程背景，研究了砂砾石填料压缩蠕变试验与高填方体的相似条件．研究表明，刚性侧限的压缩蠕变试验与大面积凹谷中的高填方体具较好的相似性，两者可近似为等应力状态，但试验得出的高填方体压缩沉降量较实测值稍小．此外，初始压实度决定了砂砾石填料的压缩变形特性，初始压实度为97．4％的砂砾石填料的压缩变形过程具对数函数特征，而初始压实度大于98．7％的砂砾石填料的压缩变形过程则以线性函数特征为主。

Compressional Creep Test of High Embankment Settlement

By taking the embankment, with a height of 104 m, of Jiuzhai-Huanglong airport as an example, similar conditions of compressional creep tests simulating the high embankment using filling material of sandy gravel were investigated. The research results show that the compressional creep tests with rigid boundary conditions have favorable similarity with the large-scale high embankment in a depression, and their stress states are very close to the same, but the amount of settlement obtained from the compressional creep tests with rigid boundary conditions are less than that of in-situ monitoring. Furthermore, the degree of initial compaction of the coarse grain filling material controls its compressional characteristics. When the degree of initial compaction is 97.4%, the process of compaction settlement shows a logarithmic characteristic, and when the degree of initial compactio is above 98.7%, the process of compaction settlement indicates a linear characteristic.