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A Controlled Blasting Method for Weak Interlayer Geological Slope

A technology for controlling blasting and weak interlayers, applied in blasting and other directions, can solve problems such as over-excavation, poor blasting effect, and high maintenance costs, and achieve the effects of avoiding secondary repairs, improving construction quality, and reducing construction and later maintenance costs

Active Publication Date: 2021-08-13
ROAD & BRIDGE INT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under the geological conditions with weak interlayers, there are cracks or broken zones inside the rock mass. With the traditional hole-interval charge structure, no matter whether the charge column is located at the broken zone or the air gap is located at the broken zone, the detonation gas will directly It acts on the broken zone, causing serious over-excavation near the broken zone, resulting in poor slope control blasting effect, requiring secondary repairs, and high maintenance costs in the later period

Method used

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  • A Controlled Blasting Method for Weak Interlayer Geological Slope
  • A Controlled Blasting Method for Weak Interlayer Geological Slope
  • A Controlled Blasting Method for Weak Interlayer Geological Slope

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Embodiment Construction

[0020] The method of the present invention will be described below in conjunction with the accompanying drawings and a specific embodiment.

[0021] Such as figure 1 , figure 2 As shown, a highway project constructed by the applicant is located in a weak interlayer geological environment, and blasting construction is adopted for roadbed excavation. A certain thickness of light blasting layer 1 is reserved after blasting in the main blasting area, creating an empty surface for slope control blasting.

[0022] The designed excavation depth of the subgrade is 10m, the slope slope is 1:0.75, the slope adopts smooth blasting, the blastholes 2 are arranged along the slope excavation line 3, and Φ70mm blastholes are used, the spacing is 15 times the blasthole diameter, and the blastholes are inclined The angle is the same as that of the side slope, and the hole depth is 13m.

[0023] The integrity of the rock mass of the slope is good, but there is a broken zone 4 with a width of ...

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Abstract

The invention provides a control blasting method for soft interlayer geological slopes. Spacer charge and non-coupling charge are used in the blast hole, and high-strength ropes are used to connect each segment of charge column and the spacer in the hole in series to form a charge structure. The charge structure is suspended on the blast hole. In the hole, the spacer in the hole is located below the broken zone in the blasthole, supported by the spacer in the hole, and filled with gun mud within a certain range above and below the broken zone. The invention can prevent the detonation gas from directly acting on the broken zone, and solve the problems of poor blasting effect and serious over-excavation when the broken zone exists in the slope rock mass.

Description

technical field [0001] The invention belongs to the technical field of engineering blasting, and relates to a method for controlling blasting of soft interlayer geological slopes by adopting smooth blasting or pre-splitting blasting. Background technique [0002] In the construction of roads in mountainous areas, blasting construction technology is mainly used for the excavation of rocky cuttings. The charge structure in the blast hole generally has a continuous charge structure and an interval charge structure. The continuous charge structure has high unit consumption, high detonation initial pressure, low effective energy utilization rate of explosives, and is prone to produce large lumps and roots; interval charge is to divide the charge column into several sections in the blast hole, and the gap between sections and sections The space is separated by airbags or brackets to form a cavity. During the blasting process, the energy of the detonation gas is first stored in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D1/00F42D3/00F42D1/08
CPCF42D1/00F42D1/08F42D3/00
Inventor 高杰李玲玉陈松洲吴曼
Owner ROAD & BRIDGE INT
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