Injection slurry diffusion range and rule determining method during anchor rod slurry injection

Abstract

The invention discloses an injection slurry diffusion range and rule determining method during anchor rod slurry injection. The determining method comprises finishing installation of an anchor rod during underground chamber engineering anchoring and slurry injection, and slurry injection, primarily determining a diffusing range of the slurry in surrounding rocks via geological observation, building a 3D rectangular coordinate system with a slurry injection hole as an original point, designing a spatial position of monitoring points in an osmotic pressure monitoring network and determining a 3D coordinate of each monitoring points, arranging a high-precision infrared osmometer in the designed monitoring points, sending data monitored by the infrared osmometer to a data processing terminal, and drawing a slurry injection hydraulic pressure and slurry diffusing range spatial distribution map according to the data achieved by the data processing terminal. The beneficial effects of the injection slurry diffusion range and rule determining method during anchor rod slurry injection are that compared with previous a theoretical model experiment for slurry diffusion search, deficiencies can be overcome that a method achieved in the theoretical experiment for determining a slurry diffusion range cannot be totally suitable for composite and variable geological conditions.

Description

technical field [0001] The invention relates to the technical field of grouting, in particular to a method for determining the diffusion range and regularity of grouting fluid during grouting of bolts. Background technique [0002] In recent years, the application range of bolt support technology in maintaining roadway stability has been continuously expanded. Bolt support is the main method for consolidating broken rock mass. Through the pressure grouting of hollow bolt body, the broken rock mass can be consolidated. , Improve the rock mass, cut off groundwater and rod body anti-corrosion, so as to achieve a good support purpose. Determining the grouting diffusion radius is an important link in the grouting design and quality evaluation, which determines the quality of the grouting effect. Although scholars at home and abroad have deduced some calculation methods for the diffusion radius of permeable grouting grout, these methods are often obtained under the assumption tha...

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Problems solved by technology

Judging from the information currently available, previous studies were mostly limited to a certain local area, and there were few global system studies.

[0005] (2) There are many contradictions in the current research on the time-varying properties of slurry flow patterns and rheological parameters

[0006] (3) The pure theoretical simulation research calculation determines that the diffusion radius of the grouting fluid is not accurate

Since the diffusion of slurry in the fracture is actually irregular, it is very difficult to calculate the diffusion radius accurately in theory

Although many literatures are dedicated to establishing a model capable of predicting the diffusion range of fracture grouting and deriving the formula of diffusion radius, various geological conditions, such as fracture opening, seepage properties, fracture roughness, whether there is filling, fracture straightness, fracture azimuth dip, fracture distribution and connectivity, groundwater pressure and flow in fracture formations, whether fracture surfaces are open, etc., and various engineering factors such as slurry viscosity and shear force, particle size in the grout, grouting pressure and flow, construction methods, etc., and these conditions are so complex and changeable, so it is impossible to establish a grouting diffusion equation that includes all factors and is suitable for all situations through theoretical experiments.

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