A method for prevention and control of roof caving in rectangular roadway

Abstract

The invention discloses a roof caving prevention and treatment method of a rectangular roadway. The method comprises the following steps: I, roadway excavation, namely excavating a roadway which needs to be subjected to roof caving prevention and treatment, wherein the roadway is the rectangular roadway; II, determination of basic mechanical parameters of a surrounding rock; III, determination of a roadway supporting scheme comprising the processes of 301, instability judgment of a roadway siding part; 302, determination of caving arch rise when the roadway siding part is in a stable state; 303, determination of the width of a sliding rock mass of the roadway siding part and the caving arch rise when the roadway siding part is in an unstable state; 304, determination of a roadway siding part supporting system and a roof supporting system; IV, supporting construction of a roadway surrounding rock: performing supporting construction on the rectangular roadway according to the roadway supporting scheme determined in the step III. The method disclosed by the invention is simple in step, convenient in implementation and good in use effect, can be used for performing effective prevention and treatment on roof caving of the rectangular roadway and avoiding the repair operation of the rectangular roadway, and is low in construction cost.

Description

technical field [0001] The invention belongs to the technical field of roadway support, and in particular relates to a method for preventing and preventing roof caving of a rectangular roadway. Background technique [0002] The basic assumptions of Platts’s caving arch theory are as follows: ①There are many joints, cracks and various weak interlayers in the rock mass, and the rock mass is cut into rock blocks with relatively small geometric dimensions by the above discontinuous interlayers, and there is still cohesive force between them. , so the surrounding rock of the roadway can be regarded as a loose body with certain cohesive force, but weak tensile, bending and shear resistance; Collapsing into one arch: when the two sides of the roadway are stable, the initial caving arch will increase continuously with the development of the collapse; if the two sides are unstable, the arch span and arch height will increase at the same time; When the arch span is doubled, the cavin...

AI Technical Summary

Problems solved by technology

[0003] Practice has shown that the basic theory of Platts' caving arch reflects the objective law of ground pressure to a certain extent, but it still has the following deficiencies: First, there is a lack of research on the instability conditions of the side of the roadway: the research shows that the stability of the side of the roadway The stability is closely related to the strength of the rock mass itself, the buried depth of the roadway, and the height of the roadway. For a certain roadway, there should be a critical height that makes the roadway unstable; secondly, there is a lack of research on the shear sliding of the roadway in different situations: when the two sides of the rectangular roadway are unstable, the roadside will have a single slope Shear failure, manifested as the sliding of roadside rock mass along a single weak surface

Therefore, there are often deviations in the calculation of the height of the caving arch and the determination of the surrounding rock pressure using the basic theory of Platts caving arch, which directly affects the accuracy of the determination of roadway support parameters

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