Shengnan Li, Junhui Zhang, Jin Chang, Hao Yang, Shao Yue, Junhui Peng, Kang Chen, Yu Li, Zhenhua Ren, Wei Chen
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引用次数: 0
Abstract
This paper presents a theoretical analysis of the damage evolution law of carbonaceous mudstone during compressive failure process under dry–wet cycling. In this study, microscopic testing and uniaxial compression synchronous acoustic emission testing systems are employed to examine the microstructure, mechanical properties, and failure acoustic signal of carbonaceous mudstone. The results demonstrated that dry–wet cycling aggravated the mesostructure damage of carbonaceous mudstone. As the dry–wet cycling increased, the pores of carbonaceous mudstone increased, and the disorganization of the mesostructure became more serious, leading to reductions in peak stress, elastic modulus, and cumulative acoustic emission signals. The analysis of PFC (Partical Flow Code) revealed that the number of crack propagation in carbonaceous mudstone increased, and the crack morphology became more complex under dry–wet cycling. A comprehensive framework was developed to incorporate crack propagation into the damage process, where in the growth of cracks exhibits an "S-shaped" pattern with axial strain. As the number of dry–wet cycling increased, the threshold strain for the accelerated damage increased, and the crack growth rate decreased, along with a decrease in the initiation damage stress. This damage pattern was further evidenced by the identification of the crack propagation morphology and rock failure localization during dry–wet cycling. The proposed method showed good consistency with the experimental test results and numerical simulations, enabling quantitative calculation of compression-induced damage in carbonaceous mudstone.
期刊介绍:
Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces:
• the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations;
• the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change;
• the assessment of the mechanical and hydrological behaviour of soil and rock masses;
• the prediction of changes to the above properties with time;
• the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.