Roadway support method for soft broken rock masses of underground mine

Abstract

The invention discloses a roadway support method for soft broken rock masses of an underground mine, which is suitable for roadway support engineering with weak rock mass weathering, hammer knocking hoarse sound and a rock mass strength value less than or equal to 10 Mpa. Advance supporting anchor rods are arranged along the arch part of a roadway, and additionally, pipe seam type anchor rods which are constructed at different footage driving cycles are mutually overlapped, so that the support effect on the soft rock masses is good; the section of the initial roadway is designed to be in the form of a three-centered arch and an inverted arch, then anchor rod advance support is performed, i.e. the pipe seam type anchor rods in the advance support anchor rods are inserted into the arch part of a roadway top plate by 1.5 m and are exposed by 1 m, each footage driving cycle does not exceed 1 m, the exposed part protects personnel to safely work below the support, then anchor net jet primary support is performed, and the interval between the primary support and the secondary support is 50 to 80 m; and according to the whole complete support method, the permanent stability of metal mine roadway engineering support can be realized, the roadway support construction quality is increased, and the roadway repair rate is reduced, so that the support cost is reduced.

Description

technical field [0001] The invention relates to the technical field of mine roadway support, in particular to a roadway support method for soft and broken rock masses in underground mines. Background technique [0002] During the excavation process of underground mining roadways in metal mines, soft and broken rock masses are often encountered. In the case of poor and difficult support, in this environment, the support of the roadway excavation face is extremely difficult. [0003] Metal mines in my country basically use steel arches or masonry as support methods for similar soft and broken rock masses, such as: Masteel Baixiangshan Iron Mine, Shandong Gold Sanshandao Gold Mine, Yinan Gold Mine, Luzhong Mining, Fanshan Phosphorus Steel arch support and outer layer shotcrete support are adopted in mines and underground mines. Since the steel arch support is passive support and cannot actively bear pressure, they all ended in failure. After the roadway support is deformed and...

AI Technical Summary

Problems solved by technology

After the deformation of the roadway support fails, it needs to be repaired again, which not only increases the mining cost, but also delays the production schedule

The tunneling and support construction of soft and broken rock mass roadways is difficult and costly. If the support design is unreasonable, it also increases safety hazards

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