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Support structure and columnar jointing basalt internal deeply-buried cavern excavation support method

A technology for supporting structures and underground caverns, which is applied in underground caverns, earthwork drilling, wellbore lining, etc., can solve problems such as prolonging the construction period, increasing the project cost, and deep relaxation depth, so as to speed up the construction progress and ensure the surrounding rock. Stable, to ensure the overall effect

Pending Publication Date: 2019-03-19
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology

Under this condition, when the conventional excavation support technology is used for construction, the slack depth of the side wall of the underground cavern is often relatively deep, some exceeding 6 meters, and some even reaching 9 meters, which exceeds the conventional bolt support length. It is necessary to implement the anchor cable, which not only prolongs the construction period, but also increases the project cost.

Method used

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  • Support structure and columnar jointing basalt internal deeply-buried cavern excavation support method
  • Support structure and columnar jointing basalt internal deeply-buried cavern excavation support method
  • Support structure and columnar jointing basalt internal deeply-buried cavern excavation support method

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Embodiment Construction

[0022] This embodiment is a method for excavating and supporting a deep underground cavern in columnar jointed basalt. The specific steps are as follows:

[0023] 1. Blasting technology:

[0024] Such as figure 1 , figure 2 As shown, in order to reduce the impact of blasting on the high side wall, the excavation is carried out by layered excavation and divisional excavation on the same floor. The side wall of the underground cavern (design sideline) reserves protective layer 1, and the thickness of protective layer 1 is 2~ 3m, the excavation height of each layer is controlled within 5m. In order to control the forming quality, the side wall (design sideline) adopts smooth blasting, and the blasting scale is strictly controlled. The single shot charge and blasting parameters can be determined by process tests. In this embodiment, the middle part of the trench is excavated layer by layer, and the outer side of the side wall (that is, the middle part of the same layer) is first exca...

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Abstract

The invention relates to a support structure and a columnar jointing basalt internal deeply-buried cavern excavation support method. The support structure is simple and easy to implement, and the columnar jointing basalt internal deeply-buried cavern excavation support method can shorten the construction period and reduce the construction cost. According to the technical scheme, the support structure is characterized by comprising a nanosteel fiber reinforced concrete layer sprayed onto an excavation surface, the surface of the nanosteel fiber reinforced concrete layer is covered by a reinforcing bar mesh which is fixed onto the excavation surface through pre-stressed anchors, and a plain concrete layer is sprayed onto the surface of the reinforcing bar mesh . The support structure and thecolumnar jointing basalt internal deeply-buried cavern excavation support method are applicable to excavation support design of columnar jointing basalt internal deeply-buried cavern sidewalls in industries such as civil construction, hydropower engineering, mining, energy storage and scientific research.

Description

Technical field [0001] The invention relates to a supporting structure and a method for excavating and supporting a deep buried underground cavern in a columnar joint basalt. It is suitable for the excavation and support design of large cavern side walls in columnar jointed basalt in civil engineering, hydropower, mining, energy storage, scientific research and other industries. Background technique [0002] With the continuous development of my country's infrastructure construction, a large number of huge and large underground projects have emerged, such as huge hydropower projects, deep tunnel traffic projects and so on. The excavation size, design burying depth, and the scale of the underground caverns are getting larger and larger, and the geological conditions for caverns are becoming more and more complicated. [0003] There are high mountains and valleys in southwestern my country, and the geological conditions are complex and diverse. Especially the excavation of large und...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D11/15E21D20/00
CPCE21D11/10E21D11/152E21D20/00
Inventor 陈益民倪绍虎杨飞郑海圣
Owner POWERCHINA HUADONG ENG COPORATION LTD
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