Method for judging depth and shallow burying of tunnel with small clear distance based on continuous surrounding rock pressure

Abstract

The invention discloses a method for judging the depth and shallow burying of a tunnel with a small clear distance based on a continuous surrounding rock pressure, belonging to the technical field oftunnel surrounding rock. The method combines the existing calculation formula of the small clear distance tunnel depth and shallow burying surrounding rock pressure, and then obtains the determinationmethod of the small clear distance tunnel depth and shallow burying based on the continuity of the surrounding rock pressure by analyzing the influence rule of buried depth to the small clear distance tunnel surrounding rock pressure. Based on the surrounding rock pressure of a shallow buried single tunnel, the surrounding rock pressure model of the shallow buried small clear distance tunnel considering the double-tunnel construction process is established. Based on the calculation model of the surrounding rock pressure of deep-buried small clear distance tunnel, the influence of the double-tunnel clear distance on the action mode of the surrounding rock pressure is considered, the action mode of the surrounding rock pressure is divided into three cases: no influence on left and right tunnels, weak influence and strong influence. The method sums up the calculation method of the surrounding rock pressure under the condition of small clear distance tunnel depth and shallow burying, andanalyzes the influence rules of tunnel geometry size, surrounding rock condition and clear distance between left and right tunnels on the critical depth burying.

Description

technical field [0001] The invention relates to a method for judging the depth and depth of a tunnel with a small clear distance based on continuous surrounding rock pressure, and belongs to the technical field of tunnel surrounding rock. Background technique [0002] In the construction of some tunnels, the construction of tunnels with large cross-sections and small clear distances is a difficult point in the construction of tunnel groups. For tunnels with large cross-sections and small clear distances, there are significant differences in the action modes of surrounding rock pressure between deep and shallow buried tunnels, and thus the design of supporting structures will also be very different. Therefore, it is necessary to determine the depth of burial when designing the support structure of a small-space tunnel. [0003] Scholars at home and abroad have carried out some research on the determination of tunnel depth. my country's "Code for Design of Highway Tunnels" h...

AI Technical Summary

Problems solved by technology

For tunnels with a small clearance distance, the excavation of the subsequent tunnel will have a secondary impact on the stress field and displacement field of the soil around the tunnel ahead, so the method for judging the depth of a single tunnel tunnel has been established for small clearance tunnels. no longer applicable

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