Authors: A.V. Uglyanitsa

Title of the article: Deep injection benchmarks for increasing the stability of open pit walls

Year: 2023, Issue: 1, Pages: 87-94

Branch of knowledge: 2.8.8 Geotechnology, mining machines

Index UDK: 622.012:622.861/862

DOI: 10.26730/1999-4125-2023-1-87-94

Abstract: The analysis of methods for stabilizing open pit walls formed in fractured rock strata was carried out. It has been established that in complex mining and geological conditions and at a pit depth of more than 100 m, the loss of stability and the collapse of the pit wall benches are in practice prevented by strengthening the fractured rock mass of the bench slope with anchor bolting in combination with injection strengthening of fractured rock, and installing anti-rockfall and catching devices on the slopes and the berm. To improve the quality of injection strengthening of fractured wall slope rock, a technology for strengthening the rock mass of the open pit slope wall using deep injection benchmarks is proposed. Such bench marks structurally perform the functions of a slotted rock or resin-grouted roof bolt, a reference rod that fixes the displacement of the slope wall rock mass, and a grouting pipe for injecting cement mortar into the well and fixing the guard mesh on it. The deep injection benchmark fixed in the well allows monitoring in real time the increase in fracture-caused cavitations around the well and performing injection strengthening of fractured rock of the slope wall differentially for each well after the formation of fracture-caused cavitation around it equal to 4-5% that is efficient for strengthening the wall rock mass, which makes it possible to increase the strength of the fractured rock mass of the bench strengthened by cementation and to increase the stability of the open pit walls during mining.

Key words: open pit bench stability fractured rock well rock anchor injection consolidation deep benchmark

Receiving date: 25.11.2022

Approval date: 15.01.2023

Publication date: 30.03.2023

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