Burning coal leaves behind two solid residual byproducts: fly ash and bottom ash. Direct application of these materials provides an economical replacement for conventional materials in large-scale construction projects such as filling low-lying areas, constructing ash dykes, and creating highway embankments. However, using coal ash for construction offers a viable solution for industrial waste disposal. To assess the performance of a structure resting on coal ash, it is essential to know the stress, strain, and volume change behavior of the coal ash. The present research aims to study the volume change and stress–strain behavior of bottom ash under triaxial drained conditions. Slurry deposition procedures were employed to prepare the test samples, which were intended to replicate the wet disposal of coal ash in the ash dykes. Early in the shearing process, the material exhibits strain-hardening behavior and then strain-softening behavior after the post-peak. With an increase in axial strain, it exhibits a contractive volumetric response that is followed by a small dilatation. Shearing of the material results in the crushing of particles identified by their gradation characteristics. Reduction in the angle of internal friction was observed with an increase in confining pressure.