Prevention and control method of extruded fluid bottom of rectangular roadway based on elastic foundation beam

Abstract

The invention discloses a method for preventing an extrusion flowing floor heave of a rectangular roadway based on an elastic foundation beam. The method comprises the following steps: (1) excavating the roadway; (2) determining basic mechanical parameters of a surrounding rock; (3) determining a roadway supporting scheme, wherein the process of determining supporting structures of a roadway side supporting system and a roadway bottom plate supporting system comprises the sub-steps of determining the width of a limit equilibrium area of a roadway side, determining the largest damage depth of a roadway bottom plate and the horizontal distance from the largest damage depth part of the roadway bottom plate to an adjacent roadway side wall and determining the roadway side supporting system and the roadway bottom plate supporting system; (4) constructing a roadway surrounding rock support; (5) extracting a following section and constructing another roadway surrounding rock support; and (6) repeatedly performing the step 5 for multiple times until the excavation of the whole rectangular roadway and the whole construction process of the roadway surrounding rock supports are completed. The method is simple in step, convenient to implement and low in input cost and construction cost, has a good use effect, and can effectively solve the problem of the extrusion flowing floor heave of the rectangular roadway and avoid the repairing of the roadway.

Description

technical field [0001] The invention belongs to the technical field of mine-used rectangular roadway bottom plate support, and in particular relates to a method for preventing and controlling a rectangular roadway extruded fluid bottom plate based on elastic foundation beams. Background technique [0002] With the continuous increase of mining scale and mining depth, due to the most complex surrounding rock conditions and stress conditions in the mining roadway, coupled with the influence of the weak floor rock layer and the advanced bearing pressure of the working face, the phenomenon of bottom sag is very common. Effective control has become an urgent technical problem to be solved. For this reason, a large number of experts, scholars and on-site engineers and technicians have carried out in-depth research on roadway undercut hazards. According to Kang Hongpu’s analysis, the reason for the bottom swell lies in the buckling of the unstable floor rock layer into the roadway...

AI Technical Summary

Problems solved by technology

Among them, on the one hand, the rock mass within the limit equilibrium area produces plastic deformation or even breaks; on the other hand, the deformed rock mass transmits the support pressure of the roof to the roadway floor, resulting in shear flow of the floor rock mass, and finally forms a squeeze. After the bottom plate rises, the subsidence of the roof and the deformation of the two sides are further aggravated, and the section of the roadway appears "neck shrinkage", which seriously affects the normal use of the roadway

But so far, there are few studies on the width of the limit balance zone of the roadway, and when analyzing the rock mass in the limit balance zone, only the effect of the upper bearing pressure is considered, and the impact of the bearing pressure above the elastic zone on the rock mass is ignored. In the engineering practice, the formation of the limit balance zone is not only the result of the abutment pressure above it, but at the same time, the support pressure above the elastic zone also has an effect on the deformation and damage of the rock mass in the limit balance zone. certain influence

To sum up, in the process of occurrence and development of extruded fluid floor, the selection of related support design parameters is unreasonable because the existing theoretical analysis is inconsistent with the actual process of deformation and failure of mining roadway floor. The construction is difficult, so the control effect of the bottom of the mining roadway is not ideal, the workload of repair is heavy, and the maintenance cost is high, which seriously restricts the normal production of the coal mine

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