Soft rock roadway buffering tapered double strong shell support system and construction method thereof

Abstract

The invention discloses a soft rock roadway buffering tapered double strong shell support system. The soft rock roadway buffering tapered double strong shell support system comprises a first strong shell, a second strong shell and a telescopic U-shaped steel support, wherein the first strong shell is an internal grouting reinforcing ring formed after cement-water glass is injected in surrounding rocks of a loose damage area; the second strong shell is an external grouting reinforcing ring formed after high-pressure chemical grout is injected in surrounding rocks of an incomplete damage area, and the second strong shell is used for connecting complete surrounding rocks with the first strong shell; the telescopic U-shaped steel support is arranged on the surface of the first strong shell, a buffer pressure-relief layer is arranged between the back of the telescopic U-shaped steel support and the surface of the first strong shell, and an internal bearing structure of the support system is formed by the telescopic U-shaped steel support and the buffer pressure-relief layer together. According to a surrounding rock reinforcing method in different grouting manners regionally, the large rheological deformation of soft rock roadway surrounding rocks is controlled, the stress state of the support system can be improved, and the stability and non-deformability of the surrounding rocks are improved.

Description

technical field [0001] The invention belongs to the technical field of soft rock roadway support, and in particular relates to a soft rock roadway bufferable gradual change type double-strength shell support system, which is especially suitable for deep large deformation soft rock roadway with severe deformation of the whole section caused by high ground stress. Background technique [0002] The rapid development of economic construction has promoted the continuous increase of energy demand, making domestic coal mines enter the deep mining stage one after another. As the main project in the mining process of underground mines, the stability of the roadway is of great significance for safe and efficient underground operations. However, due to the complexity of the geological conditions of the underground rock mass, there are many stability problems in deep roadways, especially in soft rock roadway projects, where the large rheological deformation of the rock mass under the ac...

AI Technical Summary

Problems solved by technology

[0004] At present, the conventional support technology is difficult to meet the support requirements of the deep soft rock roadway under complex conditions, resulting in large section deformation after excavation of the roadway, difficult support, and continuous repair and maintenance, which not only seriously affects the normal use of the roadway , Increase the construction cost, and pose a great threat to the personal safety of the staff

Images