Abstract
For rock structures exposed in the natural condition, chemical weathering and water softening are thought to be the main reasons for its strength degradation thus it is of great value to analyze the mechanism. This paper introduces a novel composite contact model for rock materials considering the short-term water softening and long-term chemical degradation effects. The mechanical behavior of the bond model is obtained by the Discrete Element Method (DEM) simulation of the composite bond under different load patterns (e.g. compression, tensile and shear load). The water softening and chemical weathering effects are then imported into the bond model and its mechanical behavior under normal, shear and torsion directions are analyzed. Finally, the composite contact model is established which could be used in DEM simulations to model the strength degradation of rock materials under water softening and chemical weathering attacks.
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