Deterioration elasto-plastic analysis of cracked surrounding rocks based on unified strength theory
ZHANG Qiang
WANG Hong-ying
WANG Shui-lin
GE Xiu-run
SHAO Gang
Abstract：Based on the feature of higher plastic deformation capacity and rapid destruction under high in-situ stress in deep rocks,the elastic-ideal plastic-brittle model suitable for deep rock mechanical behavior was established. For a long and circular mine opening, the surrounding rocks were divided into three regions, i. e. the cracked region, the plastic region and the elastic region. With unified strength theory, considering the action of the intermediate principle stress and the elastic modulus deterioration of the cracked surrounding rocks, the mechanical behavior of the surrounding rocks was simulated by an elasto-plastic model. The closed-form analytical solutions for the stress field and deformation field in the three regions were derived in a theoretically consistency way by using a non-associated flow rule. According to the additional conditions that the surrounding rocks turns out to be cracked, the computational formulae to determine the radii of cracked and plastic regions were obtained. Finally, an example was analyzed to show the influence of intermediate principle stress and the elastic modulus deterioration degree of cracked rocks on the range of cracked region and the deformation of the surrounding rocks.
Keywords：unified strength theorycracked regionelastic modulus deteriorationelasto-plastic analysisanalytical solution
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 381-386 )