Concrete for high-ground stress and high-ground temperature tunnel excavation primary support

A technology of tunnel excavation and high ground stress, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems that concrete is difficult to meet the construction requirements, and achieve good construction performance, reduce rockburst, and heat resistance good performance

Inactive Publication Date: 2016-01-27
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, conventional concrete is difficult to meet the construction requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Concrete for the initial support of high ground stress and high ground temperature tunnel excavation, the thickness of the sprayed layer is 15cm, 1m 3 The quality of the contained raw materials are: cement 400kg, coarse aggregate 910kg, sand 480kg, water 200kg, grade II fly ash 50kg, basalt fiber 40kg, redispersible latex powder 10kg, imitation steel fiber 6kg, polycarboxylate high-performance reducing Water agent 3kg, aluminate accelerator 15kg.

[0021] Mix the raw materials of the concrete in a double-shaft horizontal forced mixer to prepare the required concrete. After testing, the results show that the concrete can withstand a high temperature of 80°C, and the strength of the concrete will not change or change under high temperature. Cracks appear; under the gravity impact of the hammer, although the concrete is deformed, no cracks appear, and the strength does not decrease much, and the surrounding rock can continue to be supported. Therefore, the concrete prepar...

Embodiment 2

[0023] Concrete for the initial support of high ground stress and high ground temperature tunnel excavation, the thickness of the sprayed layer is 10cm, 1m 3 The quality of raw materials contained are: cement 350kg, coarse aggregate 1000kg, sand 450kg, water 220kg, grade II fly ash 100kg, basalt fiber 30kg, redispersible latex powder 12kg, imitation steel fiber 7kg, polycarboxylate high-performance reducing Water agent 2kg, accelerator 10kg.

Embodiment 3

[0025] Concrete for the initial support of tunnel excavation with high ground stress and high ground temperature, the thickness of the spray layer is 15cm, 380kg of cement, 850kg of coarse aggregate, 550kg of sand, 210kg of water, 80kg of grade II fly ash, 20kg of basalt fiber, and 15kg of redispersible latex powder , Imitation steel fiber 8kg, polycarboxylate high-performance water reducer 2kg, accelerator 12kg.

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Abstract

The invention belongs to the technical field of underground engineering materials and particularly relates to concrete for high-ground stress and high-ground temperature tunnel excavation primary support. 1m<3> of concrete comprises the following raw materials in mass: 350 to 400kg of cement, 850 to 1,000kg of coarse aggregate, 450 to 550kg of sand, 200 to 220kg of water, 50 to 100kg of II-grade fly ash, 20 to 40kg of basalt fiber, 10 to 15kg of redispersible latex powder, 6 to 8kg of steel-imitating fiber, 2 to 3 kg of high-performance poly-carboxylic acid water reducing agent and 10 to 15kg of accelerated agent. The concrete has heat tolerance and the function of preventing the brittle failure, such as rock burst; comprehensive problems of rock burst and terrestrial heat damage can be solved; the concrete is easy to stir and mix and good in construction performance; after being ejected onto a wall rock, the concrete can be quickly felted with the wall rock; under the action of the accelerated agent, the concrete is hardened with relatively short time. After the concrete is hardened, the concrete is good in heat tolerance, high in compression strength, high in tensile strength, high in bending strength, good in toughness and good in crack resistance.

Description

technical field [0001] The invention belongs to the technical field of underground engineering materials, and in particular relates to concrete for the initial support of tunnel excavation with high ground stress and high ground temperature. Background technique [0002] At present, with the construction of large-scale projects such as highways, railways, and hydropower stations in the west of my country, many projects have to pass through mountainous areas to build deep-buried long tunnel projects, and these projects inevitably pass through areas with high ground stress and high ground temperature. In areas with high ground stress and high ground temperature, comprehensive problems of rockburst and geothermal damage will be encountered, which brings great challenges to the construction personnel in this area. [0003] In a high temperature environment, there is a temperature difference between the inner and outer surfaces of the lining concrete, resulting in additional temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B14/02C04B24/26C04B16/06C04B18/08C04B14/38
CPCY02W30/91
Inventor 陈国庆刘辉唐鹏李天斌
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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