ABSTRACT
As this kind of semi-hard rock has great effect on the stability of slopes, most researchers always carry out relevant experiments to study its physical and mechanical properties in engineering, especially the softening and disintegrating properties. Wang et al. (2010) found that tertiary soft rock was mainly composed of mixed-layer montmorillonite and illite, characterizing with lower strength, light cementation and expansibility. Chen et al. (2006) claimed that the values of cohesion and internal friction angle of tertiary hard soil decrease as the value of water content increases, but their relationship is not linear, and this relationship changes greatly with sampling regions. Saada et al. (2012) indicated that rock strength properties and slope’s stability may be affected by seepage flow and the gradient of excess pore pressure distribution at different levels, and it’s necessary to study the effect of seepage field.
