Experimental Study on the Relationship between Compression Stability and Deformation Localization of Viscous/Brittle Rock‐Like Materials

Abstract

Rock-like materials often exhibit irregular failure deformation under long-term service conditions, and the deformation and failure of asphalt and concrete materials is a serious problem that leads to subgrade failure. In this study, two different viscous/brittle rock-like materials were prepared by the in situ loading and optical speckle synchronous monitoring test method, and the evolution characteristics of the deformation field were studied during compression. The formation process of the compression deformation localization of rock-like materials and their relationship with stability were analyzed. A quantitative description of the compression deformation stage and localization characteristics of the viscous/brittle rock-like materials is presented. The results can be summarized as follows. At the initial stage of compression, the deformation localization zone of viscous/brittle rock-like materials begins to expand from the middle area to the surrounding area. Preliminary results of the deformation localization of the linear elastic deformation stage were obtained. The failure cloud image is completely formed at the peak, which is consistent with the failure physical map. The deformation process of compression can be quantitatively described using the deformation localization characteristics of rock-like materials.

Study on Mechanism of Cumulative Directional Blasting of Brittle Karst Limestone in the Guizhou Province

“…Moreover, the surrounding rock was subjected to joint damage. Brittleness is a characteristic of the rock mass that causes rock fracture when subjected to small deformation [3], refecting the deformation and fracture characteristics of the rock under load. Rock brittleness is related to mineral composition, Young's modulus, Poisson's ratio, pore fuid, tensile strength, compressive strength, internal friction angle, and P-S wave velocity [29].…”

“…As a typical karst landform in the Guizhou province, the rock formations are mostly limestone and argillaceous limestone [1]. As resource exploitation moves to deep strata, limestone is characterized by complex rock properties such as high strength, high brittleness, and easy deformation during exploitation [2,3]. Te cumulative blasting technology can efciently and directly fracture the rock mass, reduce the damage of the retained rock mass, and form a regular contour surface.…”