A Design Method of Roadway Side Support Based on Weak Surface Shear Support Theory

Abstract

Disclosed is a tunnel side wall support design method based on a weak plane shear support theory. The tunnel side wall support design method comprises the following steps: building a force balance mechanical model for a slip failure of a rock mass around a half coal and rock tunnel along a certain weak plane α under the action of an external force; judging a critical condition at which a shear failure occurs on surrounding rocks on a half coal and rock tunnel side wall; determining that the shear strength on an inner side of the tunnel in a direction of 45° is maximum; building a support mechanical model for the half coal and rock tunnel side wall based on the shear strength principle that the rock mass needs to be pressed against the largest shearing weak plane on the largest shearing block after being reinforced and supported by anchor rods; and providing a calculation formula for the number n of the anchor rods on the weak planes on the tunnel side and a length li of the i-th anchor rod in order to design the tunnel side wall support. By means of the method, support materials are reduced, the support cost is reduced, and a beneficial reference is provided for the scientific performance and applicability of support parameters.

Description

technical field [0001] The invention relates to a roadside support design method based on the weak surface shear support theory, and is especially suitable for the support of the roadway side of semi-coal and rocky roadways. Background technique [0002] In recent years, with the continuous downturn of the coal market, reducing mining costs and realizing scientific and economical mining has become the primary task of coal enterprises to reform and develop against the trend. How to carry out reforms in support, continuously reduce the input of support materials, establish a scientific support system for different surrounding rock characteristics, service life, and roadway functions, and fundamentally reduce support costs are important contents that mines need to study. [0003] At present, the roadway support has always followed the support parameters in the preliminary design of the mine, and there has been no breakthrough in the scientificity and applicability of the suppor...

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Problems solved by technology

[0003] At present, the roadway support has always followed the support parameters in the preliminary design of the mine, and there has been no breakthrough in the scientificity and applicability of the support parameters. Too dense, too high support strength, high support cost, waste of support materials, etc. Therefore, it is an urgent problem to be solved in mines to study a method to fundamentally reduce the support cost.

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