A Calculation Method Applicable to Expansive Rock Tunnel Depth and Shallow Burial Limit

A calculation method and expansive rock technology, applied in design optimization/simulation, special data processing applications, geometric CAD, etc., can solve problems such as the inability to accurately determine the depth and shallow burial limit of expansive rock (soil) tunnels, so as to ensure construction safety and adopt reasonable effect

Active Publication Date: 2022-02-18
KUNMING SURVEY DESIGN & RES INST OF CREEC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can solve the current engineering problem that it is impossible to accurately determine the depth and depth of expansive rock (soil) tunnels, make up for the shortcomings of conventional designs, and can more reasonably and accurately calculate the depth and depth of expansive rock (soil) tunnels

Method used

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  • A Calculation Method Applicable to Expansive Rock Tunnel Depth and Shallow Burial Limit
  • A Calculation Method Applicable to Expansive Rock Tunnel Depth and Shallow Burial Limit
  • A Calculation Method Applicable to Expansive Rock Tunnel Depth and Shallow Burial Limit

Examples

Experimental program
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Embodiment

[0035] First, determine the width B of the tunnel excavation profile 6 according to the specific project; then according to the width B of the tunnel excavation profile 6, determine the surrounding rock pressure increase or decrease rate i when the tunnel excavation profile width B increases or decreases by 1m (when B5m, take i=0.1);

[0036] Further, the influence coefficient of tunnel width is calculated by the formula (2), and the corresponding calculation formula is:

[0037] ω=1+i(B-5)

[0038] Further, the grade s of the surrounding rock of the tunnel is determined according to the specific situation, and then the height h of the tunnel collapsed arch 5 is calculated by the formula (1) a , and the corresponding calculation formula is:

[0039] h a =0.45×2 s- 1ω

[0040] Further, the moisture coefficient ψ of expansive rock (soil) is calculated according to formula (4) w , and the corresponding calculation formula is:

[0041] ψ w =1.152-0.726α-0.00107C

[0042] I...

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Abstract

The invention discloses a calculation method suitable for the depth and shallow burial limit of expansive rock tunnels, and aims to provide a calculation method suitable for the depth and shallow burial limits of expansive rock tunnels with high calculation accuracy. It includes step (1) calculation of tunnel collapse arch height ha, step (2) calculation of atmospheric influence depth da, and step (3) calculation of depth limit H of expansive rock tunnel. The present invention judges the depth and depth of the expansive rock tunnel more accurately in theory, thereby judging the stress characteristics of the tunnel structure, making the tunnel structure design and engineering measures more reasonable, and ensuring the construction safety of the expansive rock tunnel and the safety of the tunnel structure itself .

Description

technical field [0001] The invention relates to the technical field of calculating the depth and shallow burial limit of tunnels, in particular to a calculation method suitable for the depth and shallow burial limit of expansive rock tunnels. Background technique [0002] Expansive rock (soil) covers a wide area in my country, and nearly 1 / 3 of the country's land area contains expansive rock (soil). With the large-scale construction of railway and highway projects, it is inevitable that tunnels will pass through expansive rock (soil) areas. Since expansive rock (soil) contains a large amount of hydrophilic substances (illite, montmorillonite, kaolin), it has significant deformation characteristics of water absorption expansion and water loss shrinkage. With the reciprocating occurrence of expansion and contraction deformation, the soil The intensity gradually decays. After the excavation of the tunnel, the surrounding rock around the tunnel will be disturbed, causing chang...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13G06F30/20
CPCG06F30/13G06F30/20
Inventor 郭永发杨进京殷洪波张海波陶伟明刘正初田鲁鲁丁文云伍容兵罗胜利罗云飞杨翔肖勇刚李贵民袁云洪付斌
Owner KUNMING SURVEY DESIGN & RES INST OF CREEC
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