Universal design calculation method for deep/shallow-buried vertical surrounding rock pressure of tunnel and underground space

Abstract

The invention discloses a universal design calculation method for deep / shallow-buried vertical surrounding rock pressure of a tunnel and an underground space. The method comprises the following steps of: 1, determining shapes and sizes of the tunnels and underground spaces: buried depth (H), unlined tunnel semi-width (alpha), stratum sliding surface semi-width (alpha1), tunnel height (y) and tunnel length (L); 2, determining physical parameters according to geological conditions and surrounding rock levels of the tunnel and the underground space: surrounding rock cohesive force (c), internal friction angle (phi), unit weight (gamma), Poisson ratio (mu) and initial side pressure coefficient (xi); 3, calculating and designing the following contents according to above known physical parameters: 3.1 average vertical ground pressure <delta>flat of the tops of deep / shallow caverns; 3.2 deep / shallow buried boundary depth Hmax, wherein the tunnel is a shallow-buried tunnel when the buried depth is less than Hmax, and the tunnel is a deep-buried tunnel when the buried depth is greater than or equal to Hmax; and 3.3 vertical ground pressure of the shallow-buried cavern. According to the method, no load mutation phenomenon is generated at the deep / shallow-buried boundaries, and through plenty of actual measurements and verifications, the condition is identical to the practical condition.

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 general design and calculation method for deep and shallow buried vertical surrounding rock pressures in tunnels and underground spaces. Background technique [0002] "Code for Design of Highway Tunnels" (JTG D70-2004, hereinafter collectively referred to as "Code") provides corresponding formulas for the determination of tunnel depth and shallow burial and the calculation of vertical surrounding rock pressure: the calculation of tunnel load is carried out according to the equivalent height of the load Judgment: H p =(2~2.5)h q (where H p : Boundary depth of deep and shallow buried tunnels; h q load equivalent height). The study found that the calculation of this formula will produce a sudden change in load at the boundary between deep and shallow burial, that is, at the boundary depth, there will...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a general design and calculation method for deep and shallow buried vertical surrounding rock pressure in tunnels and underground spaces; the design calculation method is based on the three-dimensional limit surrounding rock pressure theory based on multiple objective factors. On the basis of the discreteness of soil data, the reasonable calculation of the boundary depth of deep and shallow burial, the bearing range of surrounding rock, the mechanism of deformation and failure of surrounding rock, etc., an objective multi-factor surrounding rock pressure design and calculation method is provided; for safe, high-quality, fast A feasible and practical calculation method is put forward for the underground design and construction of underground engineering, which makes tunnel engineering design a big step forward from engineering analogy experience method to theoretical calculation guiding engineering practice

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