Tubal curtain advanced support constructing method for deep mine roadway of coal mine passing through fault fracture zone

Abstract

The invention discloses a tubal curtain advanced support constructing method for a deep mine roadway of a coal mine passing through a fault fracture zone. The method comprises the following steps: A, constructing an initial workshop and a receiving workshop at two ends of the fault fracture zone respectively; B, reinforcing roadways of the initial workshop and the receiving workshop by adopting astepwise combined support scheme; C, reinforcing by adopting advanced grouting according to the lithologic fracture condition of the opening; D, jacking steel tubes to the receiving workshop through the fault fracture zone from the initial workshop sequentially according to round or elliptical fracture surfaces by utilizing a soft rock tube push bench; E, in a process of jacking the steel tube, injecting a drag-reducing and lubricating material through an annular grouting system which is preset in the tube, and injecting plain concrete in the steel tube to form a tubal curtain protector; and F, performing subsequent excavation support on the roadway in the tubal curtain body after the concrete in the tube reaches a designing age. The method is simple, safe and reliable, has remarkable effect for safe excavation on a roadway with fracture densely distributed zone which has high stress, is soft to fracture and developed in fissure water.

Description

technical field [0001] The invention belongs to the technical field of deep shaft and roadway engineering construction, and more specifically relates to a pipe curtain advance support construction method for coal mine deep shaft roadways crossing fault fracture zones, which is suitable for advance support of coal mine deep shaft roadways crossing fault fracture zones, especially for high ground stress The roadway support in the extremely soft and broken water-rich surrounding rock section realizes safe and efficient tunneling in the roadway. Background technique [0002] In the process of excavating deep coal mine roadways, it is often encountered that the surrounding rocks in the same area have experienced repeated extrusion and shearing effects of multiple tectonic movements. These sections have dense distribution of faults, high tectonic stress, broken and weak surrounding rocks, and strong hydrophilicity. When the fissure water develops, the mudification of the surround...

AI Technical Summary

Problems solved by technology

Roadway excavation in high-stress soft surrounding rocks rich in water with dense distribution of faults often encounters huge problems such as large-scale collapse, large deformation and instability due to extrusion, and difficulty in passing through safely.

In some mining areas, multiple advanced support methods such as ground pre-grouting combined with advanced grouting at the working face, advanced small tube sheds, and U-shaped steel brackets have not been effective. Large-scale collapses such as roadway crowns and tunnel faces still occur during the excavation process. , the support structure can hardly withstand the large deformation and instability of the surrounding rock, which not only increases the project investment, but also delays the production, which brings major safety problems and economic losses to the coal mine

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