A Roadway Bolt Grouting Judgment and Sectional Implementation Method

Abstract

The invention provides a roadway bolt grouting determination method and segmented implementation method. Drilling is carried out in the surrounding rock of the roadway, and the drilling hole is divided into several sections, and the hole imager is used to analyze and obtain the ordinary bolt support of the roadway. The comprehensive width of the cracks in each section of the surrounding rock of the roadway is divided into intervals, and the judgment index of the roadway bolt grouting is established, and the roadway that needs grouting is determined to be reinforced by bolt grouting, and based on the comprehensive width of the cracks in each section of the roadway surrounding rock. Width, set the number of grouting holes in the grouting anchor body. A roadway bolt grouting determination and segmented implementation method of the present invention can not only perform visual judgment and analysis on whether the surrounding rock of the roadway needs grouting reinforcement through the drilling imager, but also can determine the number of grouting holes of the grouting bolt body, It improves the scientificity and reliability of bolt grouting reinforcement, and provides a scientific basis for roadway surrounding rock control, especially the bolt grouting reinforcement construction of deep broken surrounding rock.

Description

technical field [0001] The invention belongs to the technical field of roadway and tunnel support, and in particular relates to a roadway bolt grouting judgment and segmental implementation method. Background technique [0002] With the country's increasing investment in transportation, water conservancy and hydropower projects, and the increase in the intensity and depth of coal resource mining, there are more and more long and deep buried tunnels, roadways, and large-section shield tunnels, and the stability of the roadway surrounding rock is becoming more and more serious. important. Bolt grouting reinforcement technology, as a traditional reinforcement method, can effectively fill the cracks in the surrounding rock, improve the broken state of the surrounding rock, increase the strength of the surrounding rock after the peak, enhance the self-supporting capacity of the surrounding rock, control the deformation and failure of the surrounding rock, and provide support for ...

AI Technical Summary

Problems solved by technology

However, any support system has a certain scope of application. The grouting reinforcement process is more complicated, requires more equipment, and takes a longer time. Grouting support will be uneconomical and impractical. Even in unstable rock formations that cannot keep the roadway stable with conventional ordinary bolt support, such as strong rheological mudstone and rock formations without cracks, bolt grouting support will also Not applicable, may also have adverse effects

Therefore, it is very important to reasonably judge whether the roadway needs bolting and grouting support. At present, whether the roadway needs bolting and grouting mainly depends on experience, which is not conducive to the control of the stability of the roadway and tunnel surrounding rock and the bolting and grouting. Application of support

[0003] In addition, bolt grouting support is a concealed project. During the process of bolt grouting support, the cracks in the surrounding rock of the roadway are not evenly distributed. Low, affecting the grouting effect and the control of the stability of the surrounding rock of the roadway

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