EXPERIMENTAL RESEARCH ABOUT REINFORCEMENT OF WEA-THERED LAYERS ON TOP OF EARTHEN SITES

There are drought and harsh natural environment in northwest China, and the surface weathering causes most earthen sites here disappearing gradually. The paper uses glutinous rice slurries and SH as injecting paste materials to reinforce the weak weathering layers on the top of earthen sites in site. After this reinforcement, the mechanical strength and durability are measured via a mini-penetrometer, an infrared imaging device and an acoustic-waves-monitor, adding to a simulation rain test. In addition, some supplementary tests have been done indoor to make remolded samples in order to compare with the experiment results of uniaxial resist compression, wave velocity, disintegration and field tests. The experiment results show that the SH reinforcement effects on strength and resistance to water-erosions of earthen sites' surface are better than those reinforced by glutinous rice slurries. When the grouting aperture reaches 25mm, the maximum infiltration radius can be obtained. After using concentration of 2% of SH to reinforce, the strength is improved by 2.6 times, and the ability to resist disintegration is improved by 1.63 times. So the concentration of 2% of SH is the optimum to be the anti-weathering material.