Calculation method for deep and shallow buried critical depth of tunnel with small clear distance
A critical depth and calculation method technology, applied in the field of tunnel surrounding rock, can solve problems such as inapplicability
Active Publication Date: 2022-04-19
BEIJING UNIV OF TECH
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[0004] However, the above method for judging depth and depth is mainly for single-cavity tunnels, and is not applicable to double-cavity tunnels with mutual influence, that is, tunnels with small clear distances.
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[0087] Beijing-Shanghai Expressway Jinan Link Project The Changshuiquan two-way eight-lane tunnel has a single tunnel length of 3,100 meters, an excavation span of 17.608 meters, and an excavation height of 11.161 meters. The tunnel passes through III, IV and V-level surrounding rocks. Line project control engineering.
[0088] Table 2 Selected cross-section parameters
[0089]
[0090]
[0091] The K4+700 section of the Class III surrounding rock with a small clear distance (buried depth of about 40m and clear distance of about 16m) was selected for analysis, and the physical and mechanical parameters related to the surrounding rock were selected according to Table 5. According to the judgment formula of the critical clearance distance, it can be seen that this section belongs to the case of no influence, and it can be seen from Table 4 that λ′ 2 = 0.1289. According to the corresponding equations, the critical depth of shallow burial of this section is 17.7338m, and t...
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The invention discloses a calculation method for the critical depth of deep and shallow buried tunnels with a small clear distance, and belongs to the technical field of tunnel surrounding rocks. This method is based on the calculation method of the surrounding rock pressure of the deep and shallow buried tunnels with small clear distance. According to the continuous pressure of the surrounding rock at the critical depth, through the analysis and simplification of the existing calculation formula of the surrounding rock pressure, the calculation method is obtained considering the grade of the surrounding rock and the size of the tunnel section. Approximate calculation method and analysis process of the critical depth of deep and shallow burial of tunnels with small clear distance, and apply it to the solution of critical depth of deep and shallow burial of two-way eight-lane small clear distance tunnels in actual engineering. According to the calculation formula of the surrounding rock pressure of the shallow-buried tunnel with small clear distance and the calculation formula of the surrounding rock pressure of the deep buried tunnel with small clear distance, based on the continuity of the surrounding rock pressure, the calculation formula of the critical depth of deep and shallow tunnel with small clear distance is obtained, and then through Simplify parameter λ 2 ’, the equations that need to be solved with the help of mathematical software are simplified into quadratic equations in one variable, and combined with the sections under the III, IV, and V surrounding rocks, the engineering application is carried out.
Description
technical field [0001] The invention relates to a calculation method for the shallow depth and shallow buried critical depth of a small clear distance tunnel based on continuous surrounding rock pressure, and belongs to the technical field of tunnel surrounding rock. Background technique [0002] Burial depth is an important factor affecting the stability of tunnel surrounding rock. There are significant differences between shallow buried tunnels and deep buried tunnels in the surrounding rock pressure action mode and the mechanical characteristics of the supporting structure. The relationship between them has been systematically studied. Zhao Yong et al. used on-site monitoring methods to study the mechanical characteristics of the support system of the soft surrounding rock of the deep buried tunnel. The study found that the surrounding rock pressure of the tunnel with soft surrounding rock does not act uniformly on the support structure. Surrounding rock pressures vary ...
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IPC IPC(8): G06F17/12G06F30/20G06F119/14
CPCG06F17/12G06F30/20
Inventor 李鹏飞冯春晖王帆孙克国侯福金刘鹏周宗青
Owner BEIJING UNIV OF TECH