Support method implemented by aid of liquid carbon dioxide blasting, permeability improving and grouting composite anchor rods

Abstract

The invention discloses a support method implemented by the aid of liquid carbon dioxide blasting, permeability improving and grouting composite anchor rods. The support method includes arranging the filled liquid carbon dioxide blasting, permeability improving and grouting composite anchor rods in preliminarily formed drilled holes during operation; turning composite anchor rod main pipes to open expansion shells of anchoring sections at the front ends of the composite anchor rod body pipes to fix the anchor rods; detonating the composite anchor rods, carrying out phase change on liquid carbon dioxide in the body pipes to generate high-pressure gas and ejecting the high-pressure gas from spray holes in the body pipes; increasing the crack density of surrounding rock on the walls of the drilled holes under the impact effects of high-pressure gas jet and expanding the range of the surrounding rock on the walls of the drilled holes under the impact effects of the high-pressure gas jet; utilizing the blasted body pipes as grouting channels and connecting the grouting channels and external grouting pumps with one another to carry out grouting; allowing grout to flow out of the spray holes and filling crack with the grout; sleeving the tail ends of the body pipes with support plates and reinforcement nuts after grouting is completely carried out so as to apply prestress to the anchor rods. The support method has the advantages that the grout diffusion radiuses can be effectively increased by the aid of the support method, anchoring and grouting double-support effects can be realized, working procedures are simple, and the support method is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of bolt support, and in particular relates to a composite bolt support method for liquid carbon dioxide blasting anti-reflection grouting. Background technique [0002] The support and reinforcement of broken or unstable rock mass has always been a difficult problem in the field of rock mass engineering construction. Traditionally, bolts, anchor cables, grouting reinforcement, and combined anchoring and injection support are often used. When the thickness of the broken or unstable rock mass exceeds a certain distance, the anchoring end of the bolt anchor cable support can only act on the broken or unstable rock mass, and cannot act on the bedrock, and cannot form supports such as suspension and extrusion effect, effective anchoring cannot be carried out, and operation safety cannot be guaranteed. When grouting support or combined anchoring and grouting support is used, when the cracks in the broken or unsta...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method with adjustable blasting energy, controllable discharge mode, and directional and quantitative increase in the scale and range of rock mass fissures for the above-mentioned surrounding rocks with moderately developed joints and fissures, poor conne

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