Roadway supporting method for passing through weak phyllite thrust fault

Abstract

The invention belongs to the technical field of metal mine mining, discloses a roadway supporting method for passing through a weak phyllite thrust fault, and solves the problems that a weak phyllitethrust fault area of a metal mine has the characteristics of soft lithology, easiness in weathering, prominent softening and slimming phenomena when meeting water, and has obvious swelling and shrinking property, rheological property, disturbance and the like, and the problems in supporting in the prior art. According to the roadway supporting method for passing through the weak phyllite thrust fault, a steel arch and concrete combined supporting mode is adopted, respective advantages of forepoling, bolt-mesh-spurting supporting, steel arch supporting and concrete supporting are integrated, ayielding principle is combined, and weak surrounding rock is remained for deforming to reach the second equilibrium time of ground stress; the roadway supporting method has a good in-situ supporting effect; the roadway construction quality is ensured, and meanwhile, the secondary supporting probability is greatly reduced; the service life of a roadway is greatly prolonged; the cost is reduced; andtechnical guarantee is provided for safety production of the mine.

Description

technical field [0001] The invention relates to the technical field of metal mine mining, in particular to a roadway support method for crossing weak phyllite reverse faults. Background technique [0002] Phyllite is a low-grade metamorphic rock with a phyllite-like structure. The degree of metamorphism is between slate and schist. Due to shrinkage, the construction of mine shaft and roadway engineering is more difficult, especially when crossing the fault area, it is easy to have sidewalls, roof collapse and drum bottom, which makes the excavation construction and support more difficult. [0003] The engineering geological exposure results of a lead-zinc mine show that the mining area is located on the southern wing of the Dayangshan syncline, and the main body is the second lithological section (S1-2mb) of the Meiziya Formation (S1-2m), and its lithology is mainly sericite. phyllite, silty sericite phyllite, carbonaceous phyllite, with more metamorphic sandstone and greyw...

AI Technical Summary

Problems solved by technology

The mine adopts the ramp development method, and the layout of the main ramp is difficult to avoid crossing the F2 and F4 reverse faults. During the field construction, concrete support, U-shaped steel frame support and combined support of anchor, injection, mesh and spraying were used, and the site effect was not satisfactory.

The single concrete support is difficult to pour, and some areas of the roadway have collapsed before the bearing capacity reaches the peak; the U-shaped steel frame support has torsional damage, and the bottom is serious; the cement consumption of the anchor, injection, mesh and spray combined support is very large, and the construction process is complicated; In view of this situation, it is urgent to find a support method for the main slope in the weak phyllite reverse fault area with simple construction technology, easy operation, and low secondary support rate.

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