A Method for Controlling the Deformation of Large Loose Ring Roadway by a Multiple Steel Strand Combined Support Device

Abstract

The invention relates to a method for controlling deformation of a large broken rock zone roadway by using a multi-steel stranded wire combined supporting device. The method includes the steps of determining damage conditions of surrounding rock of the roadway by combining various methods, building a roadway surrounding rock shallow portion bearing ring through anchoring and shotcreting combined support, and mobilizing deep portion elastic-state surrounding rock bearing capacity through the multi-steel stranded wire combined supporting device. The multi-steel stranded wire combined supporting device is divided into an anchoring section, a free section, a sealing section and an exposed section. By the method, high supporting strength and deep supporting range can be realized at the same time, and the shallow portion bearing ring and deep portion elastic-state surrounding rock are connected into a whole; original elongation rate is still maintained after slip casting of steel stranded wires, and the method is suitable for continuous long-time nonlinear deformation of the surrounding rock; by using the method to perform surrounding rock reinforcement control on the large broken rock zone, long-time stability of the roadway can be realized, engineering quantity in multiple rebuilding of the roadway can be reduced, and the method has wide practicability.

Description

technical field [0001] The present invention relates to the nonlinear and continuous large-deformation control technology for the surrounding rock of roadway with large loose circle, especially a multi-steel strand combined support device for controlling the continuous, long-term and nonlinear deformation of roadway surrounding rock with large loose circle to control large looseness The method of round roadway deformation. Background technique [0002] With the extension of coal mine mining depth, the rock mass with the same strength and shallow part as hard rock shows the nature of soft rock under the action of high level original rock stress. It has evolved into a roadway with a large loose circle (partially exceeding 5m), and the deformation of the surrounding rock has the characteristics of continuous, long-term, and nonlinear, and the long-term stability cannot be maintained after repeated repairs. Modern rock mechanics and support theory emphasizes that the surroundin...

AI Technical Summary

Problems solved by technology

[0003]In order to solve the shortcomings of traditional passive support and existing active support technology, aiming at the adaptability of the surrounding rock bearing structure and deformation evolution law of the roadway in the large loose circle, The invention provides a method for controlling the deformation of a roadway with a large loose circle by a multi-steel strand combined support device. In the method, the shallow bearing circle of surrounding rock is constructed through anchor injection combined support to provide high radial resistance for deformation of deep surrounding rock. ; The multi-steel strand combined support device, relying on its own advantages in length and strength, connects the shallow bearing circle with the deep elastic surrounding rock, and better mobilizes the deep elastic surrounding rock's bearing capacity; the multi-steel strand The isolation of the grout and the steel strand in the free section of the line combination support device ensures that the steel strand still maintains the original elongation after the "anchor-casting integration", and can adapt to the continuous long-term nonlinear deformation of the surrounding rock

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