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A Shallow Buried and Exposed Construction Method Applicable to Hard Rock Tunnels with Super Large Sections

A technology with super large cross-section and construction method, applied in tunnels, tunnel lining, earthwork drilling, etc., can solve problems such as poor applicability, large excavation volume, environmental damage, etc. Effect

Active Publication Date: 2019-07-26
CHINA TIESIJU CIVIL ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods often bring about the problems of large excavation volume and environmental damage caused by grouting. For complex terrain conditions, strict environmental requirements, and tight construction schedules, the above methods are less applicable

Method used

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  • A Shallow Buried and Exposed Construction Method Applicable to Hard Rock Tunnels with Super Large Sections
  • A Shallow Buried and Exposed Construction Method Applicable to Hard Rock Tunnels with Super Large Sections
  • A Shallow Buried and Exposed Construction Method Applicable to Hard Rock Tunnels with Super Large Sections

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] Example 1: Such as figure 1 As shown, the CD method is used for construction.

[0028] The cross-section of the tunnel is divided into 4 parts, which are described as upper right-upper right pilot hole (first excavation section), lower right-lower right pilot hole (second excavation section), and upper left-upper left pilot hole (third Excavation section), lower left—lower left pilot hole (fourth excavation section), excavation is carried out in sequence according to the numerical order. See details for excavation Figure 3 ~ Figure 8 .

[0029] First, remove the weak soil within the scope of the exposed surface, and carry out anchor net spray protection on the weak soil slope;

[0030] Excavate the first excavation part, and then support the first support part; excavate the second excavation part, and then support the second support part; backfill the tunnel arch with earth pressure Actually; excavate the third excavation part, and then support the third supporting part; exc...

example 2

[0032] Example 2: Such as figure 2 As shown, the step method is used for construction.

[0033] The section of the tunnel is divided into 3 parts, which are described as the upper part—upper step (excavation part A), the left and right parts—the lower step left and right pilot tunnels (excavation part B), and the middle—lower step core soil (excavation part C). Excavation part), excavation is carried out in sequence according to the numerical order. For specific excavation conditions, see Figure 9 ~ Figure 14 .

[0034] First, remove the weak soil within the scope of the exposed surface, and carry out anchor net spray protection on the weak soil slope;

[0035] Perform backfilling first; excavate the excavation section A, and then support the support section A; excavate the excavation section B, and then support the support section B; Excavation section C excavates, and then supports section C; during the entire excavation process, keep excavation section B lagging behind excavat...

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Abstract

The invention provides a shallow-burying exposure construction method applicable to a hard rock tunnel with an extra large fracture surface. The excavated volume of soft soil exposed on the earth surface is compared with that of a first excavation part formed by means of a CD method, cover arch construction is conducted if the excavated volume of the soft soil is higher than that of the first excavation part, a benching tunneling method is adopted for excavation, and if the excavated volume of the soft soil is not higher than that of the first excavation part, the CD method is adopted for excavation; according to the CD method, the whole process is divided into four steps for excavation, correspondingly there are four parts to be supported, and backfill of the ground needs to be conductedin time after a second excavation part is completed; according to the benching tunneling method, the whole process is divided into three steps for excavation, and backfill of the earth surface is conducted after excavation of an upper bench is finished; side slopes of excavated soft soil are supported in time through bolt mesh spraying. The open excavation amount and grouting amount of the groundare decreased under the situation that the fracture surface of the tunnel is extra large, the adaptability is high, environmental pollution is small, the excavation speed is high, and economic benefits are remarkable.

Description

Technical field [0001] The invention relates to the field of excavation with super-large section rock in tunnels and underground structures, in particular to a shallow-buried and exposed construction method suitable for super-large section hard rock tunnels. Background technique [0002] According to data, with the further development of my country's transportation industry, a large number of large-section tunnel projects have appeared. In the current construction of shallow-buried and exposed large-section tunnels, under the conditions of shallow-buried and exposed terrain, there are mainly open-cut methods, cover-excavation methods, backfilling lean-mix back pressure methods, and backfilling grouting-reinforced under-cutting methods. The main purpose is to pass Eliminate the influence of surrounding rock or strengthen the self-stability of surrounding rock to achieve stability and safety during tunnel excavation. However, these methods often bring about the problems of large e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/14E21D9/04E21D9/00E21D11/10E21D20/00
CPCE21D9/001E21D9/04E21D9/14E21D11/10E21D20/00
Inventor 余诚孟永立陈文尹杜江山隗志远邢彪姚大闯冯冀蒙章育坤
Owner CHINA TIESIJU CIVIL ENG GRP CO LTD