Large-size simulated roadway shotcrete supporting shotcrete layer loading method

A roadway and sprayed concrete technology, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of difficulty in ensuring accuracy, difficulty in determining numerical simulation parameters, and inability to realize roadway loads, etc.

Inactive Publication Date: 2016-08-17
ANHUI UNIV OF SCI & TECH
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Problems solved by technology

Compared with similar material simulation experiments, the intuitiveness of numerical simulation is not as good as that of experiments, it is more abstract, and it is difficult to determine the parameters of numerical simulation, and the accuracy is difficult to guarantee
The traditional similar material simulation experiment simulates

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  • Large-size simulated roadway shotcrete supporting shotcrete layer loading method

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Embodiment Construction

[0008] The concrete implementation method of roadway loading method of the present invention is as follows:

[0009] 1. The basic parameters of the model. Concrete is a multi-phase composite material composed of coarse and fine aggregate, cement hydrate, unhydrated cement particles, etc., which contains a large number of micro-defects such as micro-pores and micro-cracks. The tensile and compressive properties of concrete are very different, and its compressive strength is much higher than the tensile strength. After the concrete roadway is formed, due to the action of gravity, the upper part of the roadway will generate a lateral pressure on the lower part, which is far less than the tensile strength after calculation and can be ignored. According to the basis provided by Ren Yu's article "Mechanical Properties and Engineering Application of Coal Mine Wet Shotcrete", when the concrete thickness is less than 80mm, the concrete thickness is relatively small, in the flexible st...

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Abstract

The invention discloses a large-size simulated roadway shotcrete supporting shotcrete layer loading method to realize uniform roadway stress. A composite structure is adopted, uniform roadway stress is realized by volume expansion of expansive materials, and a retardant, a cementing reinforcing agent and an expansion reinforcing agent are added into the materials. The retardant realizes control of hydration reaction time of the materials; the cementing reinforcing agent makes the materials a complete elastomer to realize uniform roadway stress; the expansion reinforcing agent is capable of increasing material volume expansion pressure to guarantee experiment required pressure. By the method, uniform roadway stress can be realized, and real conditions of the underground roadway stress can be simulated precisely to provide accurate bases for researches on roadway deformation and destruction and roadway supporting.

Description

technical field [0001] The application relates to a large-scale simulated roadway sprayed concrete support and sprayed layer loading method using expansive materials. Background technique [0002] Roadway surrounding rock deformation and failure is a phenomenon of coal and rock mass stress in underground engineering such as coal mining, and it is also one of the main factors affecting the safety of mine structures. The frequency and hazards of surrounding rock deformation and failure are becoming more and more serious. The research on its deformation and stress failure characteristics and roadway support generally adopts numerical simulation and similar material simulation at home and abroad. Compared with similar material simulation experiments, numerical simulation is not as intuitive and abstract as experiments, and it is difficult to determine the parameters of numerical simulation, and the accuracy is difficult to guarantee. The traditional similar material simulation ...

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 成云海田文元邹成松牛西安
Owner ANHUI UNIV OF SCI & TECH
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