关键词: 膨胀红砂岩, 湿化性, 湿化过程, 试验, 溜坍

Abstract: Aiming at acknowledging the slaking of expansive red sandstones in Hongshanyao hydrojunction project, by using the scanning electron microscope, X-ray diffractometer and rock mechanics rigidity electroplating servo testing system(RMTS815.03) in the tests, three different weathering degree swelling sandstones with properties of slight swelling, softening and easily weathering are observed in the process of slaking and mechanics of slaking are analyzed. Finally the slaking of red sandstone is different from swelling and fissuring essentially. Experimental results indicate that: (1)The compressive strength of the moderate weathering red sandstone, when dried, is 5.85MPa, whereas is 0.2MPa when saturated. The rock self strength is decreased with the increasing of water content, which is in possession of the serious softening effect; (2)The slaking of the expansive rock is strengthened with the decreasing of cementation coefficient, which is irrelevant to the weathering degrees of red sandstone (the depth of embedding); (3)These studies are provided the theory guiding to settle the slope topsoil slip of Hongshanyao hydrojunction project and also could be used in other related domain.

Key words: swelling red sandstone, slaking property, slaking process, experiment, topsoil slip