Super-shallow-buried small-spacing large-section multi-tunnel concurrent construction method

Abstract

The invention discloses a super-shallow-buried small-spacing large-section multi-tunnel concurrent construction method for excavating multiple parallel tunnels. The super-shallow-buried small-spacing large-section multi-tunnel concurrent construction method comprises the steps that S12, multiple antecedent tunnels are excavated in a spaced mode, antecedent tunnels excavated in the spaced mode are determined, and multi-hole spaced excavation is performed, namely one tunnel position is reserved between every two adjacent excavated tunnels; S14, multiple following tunnels are excavated in a spaced mode, spaced excavation of the multiple following tunnels is performed after the antecedent tunnels are excavated in the spaced mode for a predetermined distance, namely each following tunnel is excavated at the tunnel position reserved between every two adjacent excavated tunnels, and accordingly multi-tunnel concurrent construction is completed. On the basis that a single-side double-side pit guiding excavating method and a composite lining principle are adopted, the problem of pressure bias is effectively solved during replacement and filling at opening top low-lying positions, prestressed counter-pulled anchor rods are arranged among openings to connect the openings to form a whole, surrounding rocks among the openings are further stabilized, and the lateral pressure influence of the openings is effectively solved.

Description

technical field [0001] The invention relates to a tunnel construction method, in particular to a multi-tunnel parallel construction method with ultra-shallow burial, small spacing and large section. Background technique [0002] With the gradual enhancement of my country's economic strength and the acceleration of urban development, whether it is road tunnels, railway tunnels, or hydraulic tunnels, etc., they have already entered the vision of the broad masses of the people. And multiple parallel tunnels will become more and more common. How to safely and economically pass through places of interest has become an important topic in highway tunnel engineering, and the most critical technology is the selection of tunnel excavation and support forms. Tunnel excavation methods include full-section method, step method, ring excavation reserved core soil method, middle partition method (CD method), cross middle partition method (CRD), single side wall pilot pit excavation method, ...

AI Technical Summary

Problems solved by technology

At present, short footage is generally used for simultaneous excavation of double holes, and then the effective distance between the two holes is controlled. Generally, the face of the back hole does not exceed the second lining section of the front hole. Buried large-section multi-tunnels cannot effectively control the bias pressure at the top of the tunnel and the side pressure between the tunnels, posing a great safety hazard

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