Abstract:

With the help of a specially-designed large-scale oedometer,some experiments were carried out to investigate the compression,creep and wetting deformation of broken rock-soil mixture,which,with different broken rock contents,has been widely used in the airport construction in West China.The results show that the mixture is of high packing density,low compression and small initial creep rate when the broken rock content reaches 70%～80%,and that,for the same mixture at a certain pressure,the creep deformation is approximately linear to logarithmic time and the creep rate continuously increases with the stress level.Moreover,it is found that,when the mixture is submerged at a high stress level,significant wetting deformation may occur,and the final wetting defor-mation is greatly affected by the content of fine-particle soil in the mixture.Thus,it comes to the conclusion that,in the engineering with strict requirements for post-construction settlement,the long-term post-construction settlement due to wetting deformation should be paid more attention to.

Key words: hill fill, broken rock-soil mixture, compressibility, creep, wetting deformation