Tunnel Excavation Construction Method Based on Fracture Evolution Analysis of Surrounding Rock Partitions

Abstract

The invention discloses a tunnel excavation construction method based on the analysis of the fracture evolution of surrounding rock partitions. The tunnel to be constructed is excavated in a plurality of sections from the back to the front along the longitudinal extension direction; any section is excavated During construction, steps are included: 1. Determination of the basic mechanical parameters of the surrounding rock; 2. Analysis of the regional fracture evolution of the surrounding rock; 3. Judgment of the advance grouting reinforcement of the tunnel; 4. Advance grouting reinforcement of the tunnel; Excavation construction of the next segment; 7. Step 6 is repeated several times until the entire excavation construction process of the constructed tunnel is completed. The invention has the advantages of simple steps, reasonable design, convenient implementation and good use effect. Before the excavation of the tunnel, the fracture evolution analysis of the surrounding rock partitions is carried out, and the advanced grouting reinforcement is purposefully carried out according to the analysis results of the partition fracture evolution of the surrounding rocks, which can effectively ensure the tunnel surrounding Rock stability and tunnel safety.

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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