Non-destructive blasting excavation method without integrated rock interface foundation

An interface and basic technology, applied in the field of non-destructive blasting excavation, to achieve the effect of reducing blasting damage

Active Publication Date: 2019-07-16
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they all face the problem that there is inevitably a large gap between the energy-accumulating-energy-dissipating structure and the hol

Method used

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  • Non-destructive blasting excavation method without integrated rock interface foundation
  • Non-destructive blasting excavation method without integrated rock interface foundation
  • Non-destructive blasting excavation method without integrated rock interface foundation

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Embodiment Construction

[0023] The specific implementation of the non-destructive blasting excavation method for unconformable rock interface foundations involved in the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024]

[0025] In the excavation of a horizontal dam foundation of a hydropower station, the overlying rock mass A to be blasted is the rock mass A, and the underlying rock mass B is the rock mass used as the permanent foundation surface. There are obvious differences in the lithology of the two layers of rock mass. Belonging to a typical unconformity rock interface C, it is necessary to improve the flatness of the foundation surface and control the blasting damage to the underlying rock mass B during the excavation of the dam foundation rock mass. Shallow hole step blasting, vertical blasting, drilling diameter D = 90mm, drilling depth of about 5m, super depth of 0.3m, plugging length of 1.5m, hole spacing of 1.8m×1.8m, hole bottom...

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Abstract

The invention discloses a non-destructive blasting excavation method without integrated rock interface foundation. The method can effectively eliminate energy, separate gas and isolate vibration, therock body damage depth at the bottom of blast holes is reduced, and the blasting effect is enhanced; the method is characterized by comprising the following steps that 1, vertical blast holes which are arranged in rows are drilled in the surface of a to-be-excavated rock body; 2, a buffer layer is laid at the bottoms of the blast holes; 3, a packaging bag with certain deformability is adopted forwrapping quick-setting high-wave impedance concrete with the expansibility so as to obtain a bagged flexible energy dissipation body, and the bagged flexible energy dissipation body is enabled to freely fall to the upper part of the buffer layer through dead weight; 4, a lifting hammer is adopted to apply lateral extrusion force to the bagged flexible energy dissipation body through hammering, sothat the bagged flexible energy dissipation body and the walls of the blast holes are preliminarily attached, after the quick-setting high-wave impedance concrete in the bag is expanded and solidified, the blast holes can be filled, and high-wave impedance concrete cushion blocks which are tightly blocked at the hole bottoms are formed; and 5, explosive are loaded and blocked in the blast holes, the explosive bag is detonated through a detonator, and rock blasting is carried out.

Description

technical field [0001] The invention belongs to the technical field of engineering blasting, and in particular relates to a non-destructive blasting excavation method for an unconformable rock interface foundation. [0002] technical background [0003] In the construction of large-scale water conservancy, hydropower and mining projects, due to years of geological activities, unconformity rock interfaces are often encountered. Unconformity rock interfaces are often irregular due to the influence of topography and geology. This unconformity contact surface is also It will be carried as a permanent foundation surface, and its excavation quality directly affects the stability and safety of the buildings on it. Due to the impact of the blast load, blasting damage to the retained rock mass will inevitably occur while the blasting is completed, and the excavation formation and damage control of the rock foundation have always been the key and difficult issues in the blasting excava...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D3/04
CPCF42D1/00F42D3/04
Inventor 卢文波刘广鑫汪志林严鹏樊启祥陈明
Owner WUHAN UNIV
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