A method of replacement and support for strongly expansive muddy soft rock roadway

Abstract

The invention provides a supporting method for high-expansion argillization soft rock roadway replacement. The supporting method for high-expansion argillization soft rock roadway replacement comprises the steps that unslaked lime replacement and filling are conducted, high-strength shed type supporting is conducted, and arch support is formed by spraying concrete to an anchor net and squeezing. According to unslaked lime replacement and filling, surrounding rock is overexcavated to a proper extent, and the overexcavated surrounding rock is filled with an unslaked lime under layer with a certain thickness; according to the high-strength shed type supporting, a high-strength shed type support is used for supporting; according to the step for forming the arch support by spraying concrete to an anchor net and squeezing, thin dry type concrete spraying is conducted firstly, anchoring is conducted with short, thin and dense anchor rods for reinforcement, so that the surrounding rock can form a pressure-bearing arch which has the bearing capacity, and finally concrete is sprayed to a designed tunnel cross-section with the dry method. According to the supporting method for high-expansion argillization soft rock roadway replacement, surrounding rock expansion conditions are effectively eliminated according to the characteristics of expansion argillization soft rock, one-direction stress which the surrounding rock lacks can be compensated for sufficiently, the self-bearing capacity of the surrounding rock is brought into full play, and the surrounding rock controlling effect is improved obviously compared with a pure shed type supporting method, or a pure anchor net spraying supporting method or a supporting method combining shed type supporting and anchor net spraying supporting.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering and underground engineering support, and in particular relates to a support method for mining engineering, in particular to a method for replacing and supporting strong expansive muddy soft rock roadway. Background technique [0002] The problem of soft rock roadway control has always been one of the key issues that plague the safe and efficient mining of coal mines in my country. With the continuous increase of coal development intensity and the further development and construction of new coal areas, some mining areas have gradually encountered the problem of roadway support in strong expansive muddy soft rock. The deformation of this type of roadway presents continuous nonlinear large deformation characteristics, and the deformation mechanism of the roadway is complex. The support structure is complex and the repair rate is high, which greatly increases the investment in mine infrastr...

AI Technical Summary

Problems solved by technology

[0005] (1) Since there is no hard rock formation within the overlying rock range, it is difficult to find an effective focus point for the active support method, it is difficult to form a stable anchoring structure, and it is difficult to exert the support effect

[0006] (2) The traditional passive support shed-type support has low strength, low stiffness, and poor stability, and it is difficult to effectively control the deformation of the surrounding rock

[0007] (3) Due to the strong expansion characteristics of the surrounding rock, it is difficult to implement the grouting reinforcement method matched with active support and passive support

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