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Composite lining for large-deformation surrounding rock section

A compound, large-deformation technology, applied in the shaft lining, tunnel lining, climate change adaptation, etc., can solve the problem of not being able to fully utilize the self-bearing capacity of surrounding rocks, not being able to reflect the combination of rigidity and flexibility of the support structure, and not meeting the principle of timeliness and other issues, to achieve light weight, convenient and quick construction, and improve the overall performance

Active Publication Date: 2017-12-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the essence of the above-mentioned methods is to reserve a certain deformation space. After the compressible space is used, it will be rigid support, which cannot reflect the rigidity and flexibility of the support structure itself. In addition, between the primary support and the secondary lining If the foam concrete layer is set in between, the construction time will be prolonged. Sometimes it is difficult to adapt to the characteristics of large deformation and fast deformation of the surrounding rock, which does not meet the principle of timeliness. For self-bearing capacity, it is necessary to develop a surrounding rock reinforcement and support system that integrates anchoring, injection, and spraying

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: as Figure 1~2 Shown: a composite lining of a large deformation surrounding rock section, the primary support 6, the waterproof board 3 and the PVA-ECC secondary lining 4 are sequentially arranged along the radial direction of the tunnel from outside to inside; the primary support 6 is made of glass The fiber anchor 1 and the PVA-ECC spray layer 2 are composed, and steel mesh can be hung, steel arches, etc. can be installed according to the needs; the PVA-ECC secondary lining 4 is provided with longitudinal and circumferentially distributed steel bars 5, which can be adjusted according to the stiffness Steel arches and the like need to be added; the waterproof board 3 is located between the primary support 6 and the PVA-ECC secondary lining 4 .

[0022] The glass fiber anchor rods 1 are symmetrically arranged in the tunnel arch and side walls in a quincunx shape, and are arranged in the inverted arch to resist the pressure of the floor drum. The glass fib...

Embodiment 2

[0023] Embodiment 2: The construction technology of the composite lining of the large deformation surrounding rock section in the present invention is the same as that of the conventional composite lining structure; the PVA-ECC spray layer 2 is formed by spraying PVA-ECC material, and the PVA-ECC The secondary lining 4 is poured with PVA-ECC material, and the components of the PVA-ECC material are cement, fly ash, sand, water, water reducing agent and PVA fiber, wherein, in terms of mass ratio, cement: powder Coal ash: sand: water: water reducing agent = 1: (1.0~1.2): (0.6~0.8): (0.42~0.57): (0.001~0.003); mixed with cement, fly ash, sand and water reducing agent The total volume after uniformity is the base number, and the dosage of PVA fiber is 13~20kg / m 3 . The cement is P.O.42.5 Portland cement, the fly ash is first-grade fly ash, the particle size of the sand is 0.2mm~0.4mm, the length of the PVA fiber is 12mm, the diameter is greater than 30μm, and the anti- The tensil...

Embodiment 3

[0030] Embodiment 3: The components of the PVA-ECC material in this embodiment are cement, fly ash, sand, water, water reducing agent and PVA fiber, wherein, by mass percentage, cement: fly ash: sand: water: Water reducer=1:1.2:0.72:0.57:0.003, based on the total volume of cement, fly ash, sand and water reducer evenly mixed, the mass content of PVA fiber is 20kg / m 3 . The cement used is P.O.42.5 Portland cement; the fly ash is first-class fly ash; the particle size of the sand is 0.2mm~0.4mm; the PVA fiber is a fiber produced in Japan, the length is 12mm, the diameter is 39μm, and the tensile strength It is 1620MPa, the modulus of elasticity is 42.8GPa, and Sika polycarboxylate superplasticizer is added. Its mechanical properties test and results are as follows:

[0031](1) A prism test block of 100mm×100mm×300mm was used, and the axial compressive strength test was carried out after 28 days of curing according to the standard curing method. The test results show that the ...

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Abstract

The invention discloses a composite lining for a large-deformation surrounding rock section. The composite lining comprises a primary support, a waterproof plate and a Polyvinyl alcohol Fiber-Engineered Cementitious Composite (PVA-ECC) secondary lining body. The primary support is composed of glass fiber anchor rods and a high-toughness PVA-ECC spray layer. The PVA-ECC secondary lining body is composed of steel bar reinforced PVA-ECC materials. The PVA-ECC materials comprise the components of cement, coal ash, sand, water, water reducing agents and PVA fibers. According to the composite lining for the large-deformation surrounding rock section, the flexibility and deformation capability of the lining can be significantly improved, the pressure of surrounding rock on the periphery of a tunnel is effectively released, the support requirement of the large-deformation tunnel can be met, the lining is prevented from cracking and being damaged, and the composite lining for the large-deformation surrounding rock section has the characteristics that construction is safe, convenient and rapid and other characteristics.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a composite lining for large deformation surrounding rock sections. Background technique [0002] Since the first serious large deformation of weak surrounding rock in a traffic tunnel occurred in the early 20th century, there have been many cases of large deformation of surrounding rock in tunnel engineering at home and abroad, and it has always been a major problem in the underground engineering field. Foreign countries such as Enasan Highway Tunnel in Japan, Tauern Tunnel and Arlberg Tunnel in Austria, and domestic Guanjiao Tunnel on Qinghai-Tibet Line, Dazhailing Tunnel and Baoziliang Tunnel on Baozhong Line Large deformations of the surrounding rock in different forms and degrees have occurred in projects such as the Jiazhuqing Railway Tunnel on the Nankun Railway and the Jiazhuqing Railway Tunnel on the Nankun Railway, which caused cracking of the spr...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D11/04E21D21/00C04B28/04C04B16/06
CPCE21D11/04E21D11/10E21D21/0006C04B16/0641C04B28/04C04B18/08C04B14/06C04B22/002C04B24/24Y02A30/30
Inventor 丁祖德李晓琴杜茜杜婷
Owner KUNMING UNIV OF SCI & TECH
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