Abstract
AbstractThe mechanical behaviors of rockfill materials at a comparatively low pressure are very important (e.g., for the stability of the top part and the slope of rockfill dams). In addition, the stress conditions of rockfill dams are unlikely to be axisymmetric but are three-dimensional. Because of this, the influence of the intermediate principal stress has to be taken into consideration in design. This paper presents a study on the effect of intermediate principal stress on the strength and dilatancy behavior of rockfill material at a comparatively low pressure. A series of constant b-value tests were carried out on rockfill materials commonly used for earth dam construction. Using the test data, the influences of the b-value on the peak friction angle, critical-state friction angle, and maximum dilatancy angle of rockfill materials were investigated. A revised relative dilatancy index was proposed for rockfill material to describe the change in the shear strength with the intermediate principal stres...
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