Method for zonal fracture and evolutionary analysis of surrounding rock of deeply-buried cavern

Abstract

The invention discloses a method for zonal fracture and evolutionary analysis of a surrounding rock of a deeply-buried cavern. The method comprises the steps of step I, digging the cavern: digging a currently constructing cavern; step II, determining a basic mechanical parameter of the surrounding rock: testing the basic mechanical parameter of the surrounding rock of the currently constructing cavern; and step III, zonal disintegration and evolutionary analysis of the surrounding rock: performing zonal disintegration and evolutionary analysis of the surrounding rock on the currently constructing cavern according to the basic mechanical parameter of the surrounding rock determined in the step II, and respectively determining the number M of fracture zones presence in the surrounding rock of the dug currently constructing cavern and the thickness and the fracture time of each fracture zone according to the analysis result. The method for zonal fracture and evolutionary analysis of the surrounding rock of the deeply-buried cavern is simple in step, reasonable in design and convenient to implement and good in usage effect; through the zonal fracture and evolutionary analysis of the surrounding rock, the number of the fracture zones at the outer side of the currently constructing cavern and the thickness, position and fracture time of each fracture zone can be obtained, and a reliable basis is provided for subsequent cavern digging and surround rock supporting.

Description

technical field [0001] The invention belongs to the technical field of underground cavern construction, and in particular relates to a method for analyzing the regional fracture evolution of the surrounding rock of a deeply buried cavern. Background technique [0002] Since the beginning of the 21st century, the development and utilization of deep rock mass engineering has become the most active research direction in the field of civil engineering. A large number of mine roadways, mountain traffic tunnels, water diversion tunnels, nuclear waste deep-buried disposal wells and oil war preparations Storage projects and other large-scale deep-buried rock mass projects have started construction one after another. According to incomplete statistics, there are over 100 metal mines abroad with a mining depth of more than 1,000 meters, most of which are located in South Africa and Russia; the mining depth of many mines in my country has exceeded 1,000 meters. It is estimated that in...

AI Technical Summary

Problems solved by technology

Although the existing studies have concluded that the stress and strain of the surrounding rock under the condition of zonal failure are alternately distributed in peaks and troughs, and the actual working state of the anchor rod in tension-compression alternation has been found through on-site monitoring when the surrounding rock is zonally broken, there is no further research on the stress and strain of the anchor bolt. Back analysis of the basic laws of partitioned fractures of surrounding rocks in caverns based on the force state

At present, the research on the zonal fracture of surrounding rock is still in its infancy, especially in determining the thickness, quantity and time of the surrounding rock fracture zone.

Correspondingly, the safety risks in the excavation process of underground caverns with deep surrounding rock partition rupture are very large

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