Surrounding rock grading correction method and device based on tunnel buried depth and weathered layer thickness

Abstract

The invention relates to a surrounding rock grading correction method and device based on tunnel buried depth and weathered layer thickness. The method comprises the steps that 1, for a tunnel section, fully located at a single weathered stratum, of a tunnel hole section, a standard regulation method is adopted for basic surrounding rock grading to obtain an initial surrounding rock grade; 2, according to the tunnel buried depth and the weathered layer thickness, the initial surrounding rock grade is graded and corrected to obtain the corrected surrounding rock grade. Since the influence of the tunnel buried depth and weathered layer thickness is not considered during surrounding rock grading in the prior art, the invention provides the brand-new surrounding rock grading correction method.According to the tunnel buried depth and weathered layer thickness, the initial surrounding rock grade is graded and corrected, the subjective influence is reduced, and through surrounding rock gradequantification, the tunnel surrounding rock distinction correction effect is obvious.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a method for grading and correcting surrounding rock based on the buried depth of the tunnel and the thickness of the weathered layer. Background technique [0002] At present, a large number of urban tunnels and short mountain tunnels have emerged. They all have a common feature. The tunnel depth is not large, and the tunnel body passes through composite strata with different degrees of weathering. However, the current tunnel design specification does not consider the tunnel depth and differentiated layers in the rock classification. For the influence of thickness, geological engineers generally consider the influence of tunnel burial depth for safety reasons, resulting in greater uncertainty in the classification of tunnel surrounding rock. [0003] The current surrounding rock classification methods have the following problems: [0004] (1) The classifi...

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Problems solved by technology

[0004] (1) The influence of weathering degree of rock is considered in the classification of tunnel surrounding rock, and there are specific identification methods for rock weathering degree, but the current classification management method of tunnel surrounding rock does not consider the depth of tunnel and the thickness of weathered rock layer, and the surrounding rock of composite weathered rock layer is missing Grading method

[0005] (2) The current surrounding rock classification method is a combination of quantitative and qualitative. Generally, the geological engineer proposes the surrounding rock classification, and the tunnel engineer proposes targeted engineering measures for different surrounding rock levels, and considers the buried depth of the tunnel and the degree of terrain bias However, it often happens that geological engineers will also consider the impact of the buried depth of the tunnel, resulting in a strong surrounding rock level or engineering measures, resulting in project waste

[0006] (3) The plane curve radii of high-speed railways are relatively large, and there are a large number of short and small tunnels and large shallow buried tunnels in the course of line selection, often with different weathered rock formations in the tunnel body or weathered layer interfaces in the upper and lower areas of the tunnel. According to the code, there is subjective arbitrariness in the classification of surrounding rocks, and due to the large amount, there may be insufficient or wasteful engineering design measures

[0010] The current surrounding rock classification does not take into account the impact of the buried depth of the tunnel, but for geological engineers, the smaller the buried depth, the weaker the arching ability of the surrounding rock. Appropriate conservatism also has institutional factors

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