Contour blasting method for joint development rock masses

A profile and joint technology, which is applied in the field of profile blasting of rock mass with joints, can solve problems such as the difficulty of applying columnar joints, and achieve the effects of low material cost, improved strength and integrity, and prolonged action time

Active Publication Date: 2016-07-06
WUHAN UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main method to control the excavation quality of rock mass is to adopt the contour blasting method, but the conventional contour blasting method is difficult to apply to the rock mass prone to damage and loosening such as columnar joints

Method used

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  • Contour blasting method for joint development rock masses
  • Contour blasting method for joint development rock masses
  • Contour blasting method for joint development rock masses

Examples

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Embodiment 1

[0033] In the excavation project of the rock foundation protection layer of a high arch dam in a water conservancy and hydropower project, since the foundation rock mass belongs to columnar joint rock mass, the blasting vibration of conventional contour blasting is large, the blasting damage range is large, and the columnar joint surface loosens after blasting. Therefore, it is considered to use the contour blasting technology of the present invention to ensure the excavation quality. According to the requirements, the contour blasting method adopts the pre-splitting blasting scheme. The protective layer adopts deep hole step blasting, and the excavation and drilling layout of the protective layer is as follows: figure 2 and 3 As shown, the step height is 8m, the rock foundation inclination angle α=65o, the protective layer thickness is 5m, the drilling depth of the pre-splitting hole 11 (contour blasting hole) is 8.8m, and the main blasting hole 9 and the buffer hole 10 need...

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Abstract

The invention discloses a contour blasting method for joint development rock masses, and belongs to the technical field of water conservancy and hydropower projects. The contour blasting method comprises the following steps of charging an explosive and a priming material into a contour blasting hole, and only adopting reinforced charging structures at the hole opening and hole bottom, near a blockage section, of the charging section; then, pouring cement mortar, enabling the cement mortar to fill the joint and fracture of the contour blasting hole and the surrounding thereof by the self-gravity, and detonating the explosive before the initial setting of the cement mortar. The contour blasting method has the advantages that the cement mortar is used as a coupling medium, and can be used to fill the joint and fracture of the blasting hole and the surrounding rock mass thereof, and the strength and integrity of the rock mass are improved; under the action of blasting impact pressure, the compression amount of the cement mortar is little, the expansion speed of the gas produced by blasting is slow, the action time is prolonged, the blasting load is stably and uniformly applied to the surrounding hole wall, and the better contour blasting effect is obtained; the energy utilization rate of the explosive is improved, the consumption of the priming material and explosive is effectively decreased, and the blasting cost is reduced.

Description

technical field [0001] The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a contour blasting method suitable for rock masses with developed joints. Background technique [0002] The excavation quality of hydraulic building rock mass in water conservancy and hydropower projects is directly related to the displacement and stability control of rock mass structure and hydraulic structures during the construction and operation periods, and is a key technical issue in the construction of water conservancy and hydropower projects. In recent years, the construction center of large-scale water conservancy and hydropower projects has shifted to the alpine and canyon regions in the southwest. The geological conditions in the southwest region are complex, the rock mass is deeply weathered, the unloading depth is large, and the joints and fissures are developed, which brings great challenges to the rock mass blasting and excavati...

Claims

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Application Information

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IPC IPC(8): F42D1/08F42D3/04
CPCF42D1/08F42D3/04
Inventor 陈明邓珂卢文波严鹏王高辉
Owner WUHAN UNIV
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