Simplified design calculation method for tunnel and underground space different cavity shape surrounding rock pressure

Abstract

A simplified design calculation method for tunnel and underground space different cavity shape surrounding rock pressure comprises the following steps that according to known conditions provided by the design of the tunnel and the underground space, the length-width ratio n and the depth influence coefficient value n' of a sunken soil column are obtained, wherein n '= 2n/(1 + 2n); n and n' judge the shape of the cavern; according to the geological conditions and the grades of the surrounding rocks, physical parameters are determined: a cavity shape surrounding rock cohesive force c, an internal friction angle weight gamma, a Poisson's ratio mu and an initial side pressure coefficient xi which are equal to/(1-mu); and the surrounding rock pressure values of the tunnel and the underground space by applying a simplified formula corresponding to the shape of the corresponding cavity are calcualted. Surrounding rock pressure values calculated through the method are well matched with measured values, and the engineering actual situation is met. A beneficial reference value is provided for application of the load structure method to guidance of engineering practice.

Description

technical field [0001] The invention belongs to the technical field of calculation and design of surrounding rock pressure in tunnels and underground spaces, in particular to a simplified design and calculation method for surrounding rock pressures of different cave shapes in tunnels and underground spaces. Background technique [0002] Application number: 201610824651.1 Invention application name "Universal Design and Calculation Method for Deep and Shallow Buried Vertical Surrounding Rock Pressure in Tunnels and Underground Spaces" (hereinafter referred to as "General Method"), which provides a general design and calculation method to solve the calculation of surrounding rock pressure. This "universal method" is a three-dimensional limit surrounding rock pressure calculation theory based on objective multi-factors, taking into account the buried depth H, the half-hole width α, and the half-width of the stratum sliding surface α 1 , hole height y, subsidence soil column len...

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Problems solved by technology

[0004] However, using the "universal method" to calculate the surrounding rock pressure values ​​of underground spaces with different cross-section types such as rectangles, circular tanks, squares, and through tunnels, the selection of parameters is cumbersome. Which parameters are applicable and which parameters Not applicable, need to analyze and judge according to the situation and experience

In addition, this "universal method" is not the most simplified calculation for different hole shapes

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