Soft rock chamber floor heave treatment supporting structure and method based on prefabricated assembly type bottom arc plates

Abstract

The invention relates to a soft rock chamber floor heave treatment supporting structure and method based on prefabricated assembly type bottom arc plates. The supporting structure comprises a steel bracket, prefabricated assembly type bottom arc plates, anchor cables and a bottom plate waterproof layer, wherein a plurality of prefabricated assembly type bottom arc plates are assembled to form a reinforcement bottom plate, the steel bracket is supported or inserted into the prefabricated assembly type bottom arc plates at two end parts, the end parts are subjected to special treatment so as tobe exactly matched with the steel bracket, the anchor cables penetrate through the prefabricated assembly type bottom arc plates and are anchored inside surrounding rocks, the anchoring ends of the anchor cables are beyond the depth of a zero displacement marking line of the bottom plate, the depth of the zero displacement marking line is determined by matching field monitoring with theoretical analysis, and the bottom waterproof layer is laid at the inner sides of the prefabricated assembly type bottom arc plates. The supporting structure of the invention adopts a special reinforced support technology of matching the high-bearing-capacity bracket with the bottom plate, is simple in construction and economic in cost, not only reinforces the support force of the bottom plate and suppressesthe deformation of the bottom plate, but also can optimize the overall support of the roadway, thereby being capable of effectively reducing the problem of floor heave of the chamber, and reducing therepairing rate of the chamber.

Description

technical field [0001] The invention belongs to the field of underground engineering support, and in particular relates to a structure and method for controlling and supporting a bottom drum of a soft rock chamber based on a prefabricated assembled bottom arc plate. Background technique [0002] At present, most coal mines in my country have entered the stage of deep mining. It is difficult to support and stabilize the roadways excavated under complex geological conditions such as deep soft rock, faults, and high ground stress. The problem of roadway surrounding rock control and management is increasingly apparent. The problem of governance is particularly prominent. The lack of support or weak support in the middle floor of the coal mine roadway makes it a weak link in the roadway support, which causes the stress release of the surrounding rock and the deformation of the roadway to appear first on the bottom plate, forming a bottom heave phenomenon, which further causes roadw...

AI Technical Summary

Problems solved by technology

[0002] At present, most coal mines in my country have entered the stage of deep mining. It is difficult to support and stabilize the roadways excavated under complex geological conditions such as deep soft rock, faults, and high ground stress. The problem of roadway surrounding rock control and management is increasingly apparent. The problem of governance is particularly prominent. The lack of support or weak support in the middle floor of the coal mine roadway makes it a weak link in the roadway support, which causes the stress release of the surrounding rock and the deformation of the roadway to appear first on the bottom plate, forming a bottom heave phenomenon, which further causes roadway damage. Overall deformation and failure

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