Excavating and supporting method of roadway containing quicksand layer

Abstract

The invention discloses an excavating and supporting method of a roadway containing a quicksand layer; the method comprises the following steps that (1) before the roadway is excavated, a slip casting pipe is arranged into the quicksand layer in front of an excavation direction along the design section line of the roadway, cementing slurry is injected into the quicksand layer by a slip casting pump, so that the quicksand layer is cemented together, and then an advanced temporary supporting method is adopted; (2) the roadway is excavated through a conventional excavating method, and anchor mesh spray primary supporting is carried out through a conventional supporting method after safe footage is reached; (3) anchor rope secondary supporting is carried out, a steel strand with the diameter being phi 12mm to 16mm and the length being 5m to 8m is adopted as an anchor rope, and the anchoring length needs to be more than 1m; and (4) U-shaped steel telescopic supports are used for enhancing the supporting, and the spacing between the U-shaped steel telescopic supports is 0.8m to 1.0m. According to the excavating and supporting method of the roadway containing quicksand layer, the problems that the quicksand layer is easy to collapse so that the formation of the roadway is difficult and the construction is unsafe are solved; and in addition, the supporting capability is improved, so that the deformation of the roadway after being supported is greatly improved, and the requirement of long-term stability is met.

Description

technical field [0001] The invention relates to a roadway excavation support method. Background technique [0002] At present, in the excavation of underground coal mine roadways (especially Shimen), it is often encountered that the roadway passes through the quicksand layer. If ordinary temporary support measures are used during excavation construction, the quicksand layer is easy to collapse, the roadway section is difficult to form, and the construction is difficult. It is safe; and after excavation, it is difficult to achieve the support effect if the ordinary anchor net spray support method is used alone. One month after the support is completed, the roof will show obvious deformation and increase, and the deformation will reach more than 500mm. The deformation is also 300mm, and the deformation rate reaches 11mm / d, which exceeds the limit deformation allowed by the general bolt support; at the same time, the pallet sinks under the bolt support, and it is difficult to a...

AI Technical Summary

Problems solved by technology

[0002] At present, in the excavation of underground coal mine roadways (especially Shimen), it is often encountered that the roadway passes through the quicksand layer. If ordinary temporary support measures are used during excavation construction, the quicksand layer is easy to collapse, the roadway section is difficult to form, and the construction is difficult. It is safe; and after excavation, it is difficult to achieve the support effect if the ordinary anchor net spray support method is used alone. One month after the support is completed, the roof will show obvious deformation and increase, and the deformation will reach more than 500mm. The deformation is also 300mm, and the deformation rate reaches 11mm / d, which exceeds the limit deformation allowed by the general bolt support; at the same time, the pallet sinks under the bolt support, and it is difficult to achieve the support effect

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