Effect of Rock Stress Evolution on Failure Under Transverse Plain Water Jet

• Published in: Geotechnical and geological engineering Vol. 38; no. 4; pp. 3941 - 3954
• Main Authors: Hu, Mengmeng, Li, Biao, Zhang, Bo, Zhang, Chao, Nie, Lichao, Liu, Zhengyu, Cao, Wenzheng
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.08.2020; Springer Nature B.V
• Subjects: Brittleness; Civil Engineering; Damage; Earth and Environmental Science; Earth Sciences; Evolution; Exact solutions; Failure analysis; Geotechnical Engineering & Applied Earth Sciences; Hydraulic jets; Hydrogeology; Mohr-Coulomb theory; Original Paper; Rocks; State variable; Terrestrial Pollution; Time dependence; Trace elements; Waste Management/Waste Technology; Transverse plain water jet; Time dependence; Rock breaking; Elastic-brittle damage; Analytical solution of stress evolution
• ISSN: 0960-3182; 1573-1529
• DOI: 10.1007/s10706-020-01269-7

The subject of this investigation is the stress evolution characteristics of rock impacted by transverse plain water jet (PWJ), including the application of stress evolution in the interpretation of the laws of breaking rocks (including artificial rock). Based on the semi-infinite plane theory, an analytical solution of the stress evolution of rock subjected to transverse jet loading is obtained, and the evolution of the stress state variable F of the rock microelement based on the Mohr–Coulomb criterion is also obtained. Then, elastic brittle failure and elastic-brittle damage of rock microelements are analyzed. Besides, an expression of the damage variable D based on elastic-brittle failure assumption is proposed. The analysis shows that the peak values of the F evolution curve determines the failure of the rock microelement based on the elastic-brittle failure hypothesis. The area S F surrounded by the evolution curve F and the line ( F  =  F 0 ) is positively correlated with the damage variable D , which can be used to qualitatively explain the time dependence of breaking rock using a transverse PWJ. In addition, the method based on damage variable D presented in this paper shows great potential in quantitative analysis of time dependence of rock failure.