Support method for high stress roadway coal-rock mass

Abstract

A support method for high stress roadway coal-rock mass includes constructing surface wall rocks into a tough transition seal layer after the roadway is excavated and formed, respectively intersecting and distributing a self-entrance type grouting long anchor rod and a short anchor rod into the roadway coal-rock mass, injecting rigid slurry materials and soft slurry materials in the wall rocks inlayering mode, constructing the rigid slurry-material-injected wall rock into a rigid support layer in situ, modifying the soft-slurry-injected wall rock into a soft decompression layer in situ, and forming a rigid and soft nesting transition layer at the mutual nesting position of the two layers. The support method for the high stress roadway coal-rock mass improves the capacity of deep rock mass of the roadway wall rocks for adapting to large deformation and self-bearing, improves a stress distribution state of the high stress roadway wall rocks, enables the high stress roadway to be formedat one step and supported at one step, ensures the stability of the roadway under the conditions of complex structures, high stress, large range loosening and crushing and large deformation.

Description

technical field [0001] The invention is related to the support method for the broken surrounding rock mass of the roadway, and further relates to a support method for the deformation and failure of the high-stress broken coal rock mass in the roadway. Background technique [0002] The mining depth of the mine continues to increase. When the mining depth is above 600 meters, the high stress field formed by the coupling of the self-gravity stress field, the residual structural stress field and the support stress field caused by excavation makes it difficult to control the stability of the roadway surrounding rock. High stress, large deformation and its broken characteristics make it more difficult to support the roadway surrounding rock. Many mining areas have adopted multiple renovations and multiple grouting to maintain production, and were even forced to abandon mine mining under high-stress conditions, which seriously affected the safe production of mines. [0003] At pre...

AI Technical Summary

Problems solved by technology

The rock mass strengthened by simple inorganic cement grout shows rigid characteristics, and it is easy to be deformed and collapsed after being disturbed by repeated stress and loses the supporting function; the rock mass reinforced by pure organic chemical grout shows flexible characteristics, but the chemical grout is not strong enough, and Too high cost, serious pulp leakage

Therefore, there is still the problem of unsatisfactory support effect in the actual use process.

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