Tunnel excavation construction method based on zonal fracturing evolution analysis of surrounding rocks

Abstract

The invention discloses a tunnel excavation construction method based on zonal fracturing evolution analysis of surrounding rocks. The tunnel excavation construction method comprises the following steps: performing excavation construction on a constructed tunnel in a mode of multiple segments in the longitudinal extension direction from back to front; when excavation construction on any one of thesegments is carried out, the steps are as follows: 1, determining basic mechanical parameters of the surrounding rocks; 2, performing zonal fracturing evolution analysis on the surrounding rocks; 3,performing pre-grouting reinforcement judgement on the tunnel; 4, performing pre-grouting reinforcement on the tunnel; 5, performing excavation construction on the tunnel; 6, performing excavation construction on the next segment; 7, repeatedly carrying out the step 6 until the whole excavation construction process of the constructed tunnel is completed. The tunnel excavation construction method disclosed by the invention has the advantages of simple steps, reasonable design, convenience in realization and good use effect; before the tunnel is excavated, the zonal fracturing evolution analysisof the surrounding rocks is carried out, and according to a zonal fracturing evolution analysis result of the surrounding rocks, pre-grouting reinforcement is carried out purposely, and the stabilityof the surrounding rocks of the tunnel and the security of the tunnel can be effectively ensured.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a tunnel excavation construction method based on the analysis of the fracture evolution of surrounding rock partitions. 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 ...

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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