Calculation method of surrounding rock pressure in shallow tunnels

By establishing a unified mathematical model, the complexity of calculating surrounding rock pressure in shallow tunnels in existing specifications is resolved, a simplified calculation method is provided, which is applicable to various working conditions and improves the versatility and comprehensibility of the calculation.

CN115357975BActive Publication Date: 2025-09-23CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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Patent Information

Application Number
CN202210927663.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-03
Publication Date
2025-09-23
Estimated Expiration
2042-08-03

AI Technical Summary

Technical Problem

Existing industry specifications lack a unified expression model for calculating surrounding rock pressures of different types of shallow tunnels, resulting in a cumbersome and complex calculation process that is difficult to understand and operate. This makes the calculation process unsuitable for special working conditions involving irregular ground, irregular sliding bodies, and multi-layered soil formations.

Method used

A unified mathematical model based on the rigid body equilibrium concept is established. By calculating parameters such as the horizontal lateral pressure coefficients of the inner and outer tunnel side walls, and the angles between the fracture surfaces of the inner and outer sliding wedge blocks of the slope and the horizontal plane, a unified expression model and calculation formula for the surrounding rock pressure of tunnels suitable for shallow non-biased and shallow biased conditions are constructed.

Benefits of technology

A simplified, easy-to-understand and easy-to-operate method for calculating tunnel surrounding rock pressure is provided, which can be applied to a variety of working conditions, overcomes the problems of lengthiness and inconsistency of existing specifications, and improves the versatility and physical clarity of the calculation.

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Abstract

The present invention relates to a method for calculating the surrounding rock pressure of shallow tunnels. Existing industry specifications lack a unified expression model when calculating the surrounding rock pressure of different types of shallow tunnels, and the calculation process is complicated. This method establishes a mathematical force model of the surrounding rock pressure of shallow tunnels based on the surface level, shallow non-biased working conditions and the surface tilt, shallow biased working conditions; calculates the horizontal side pressure coefficient of the tunnel side wall and the angle between the rupture surface of the sliding wedge block in the slope rock and soil and the horizontal plane; calculates the horizontal side pressure ratio coefficient of the tunnel side wall; and calculates the surrounding rock pressure of the shallow tunnel based on the mathematical force model. The present invention constructs a unified expression model for the surrounding rock pressure of shallow tunnels, and provides a method for calculating the surrounding rock pressure of shallow tunnels based on the unified expression model. The model formula has clear physical connotations, unified mathematical expression logic, and a simple structure. It can be extended to special working conditions when the ground is irregular, the sliding body is irregular, and the stratum is multi-layered soil, overcoming the disadvantages of lengthy expressions and incomplete consideration of working conditions in the standard formula.
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