Authors: A.G. Protosenya, M.A. Vilner

Title of the article: Forecast of stress-strain state of fiber-reinforced concrete support in discontinious rock masses

Year: 2021, Issue: 5, Pages: 5-14

Branch of knowledge: 25.00.20 Geomechanics, rock destruction by explosion, mine aerogasdynamics and mining thermal physics

Index UDK: 622

DOI: 10.26730/1999-4125-2021-5-5-14

Abstract: Maintaining of the mine drifts stability is a priority in the work of a mining enterprise. Over time, it becomes necessary to develop mineral resources that are situated in increasingly difficult mining and geological conditions. A highly jointed rock mass can be considered as a particular case. The most unfavorable case of lining loading is the separation of rock mass in the roof or sides of the working, while the entire weight of the separated rock falls on the lining. In addition, when the rock mass acts on the support, the support might be partly stretched. These conditions lead to the need to develop and use advanced supports at mining enterprises. The article substantiates the use of fiber-reinforced shotcrete lining instead of monolithic concrete or shotcrete. The main advantage of such lining is an increase in the strength characteristics of concrete due to the reinforcement with steel or composite fiber. Compared to shotcrete, the tensile strength in bending differs by 150-180 %. The study of the behavior of fiber-reinforced shotcrete with different mechanical characteristics is carried out using numerical simulation methods. The dependences of the bearing capacity of the lining on the characteristics of concrete in various conditions are obtained, and the residual strength is analyzed. The conditions for using fiber-reinforced shotcrete lining instead of monolithic concrete and shotcrete linings have been substantiated.

Key words: stress-strain state jointed rock mass apatite-nepheline deposit drift support shotcrete fiber-reinforced concrete model of concrete plastic behavior numerical modeling

Receiving date: 15.09.2021

Approval date: 25.10.2021

Publication date: 24.12.2021

CITE DOWNLOAD