Method for treating deep loose and soft rock stratum roadway floor heave through jet grouting piles

Abstract

The invention discloses a method for treating a deep loose and soft rock stratum roadway floor heave through jet grouting piles. The method comprises the steps that firstly, the lithology of a floor rock stratum is detected to determine the position of a floor key layer, jet grouting pile sets are arranged on all cross sections of segments, prone to being subjected to the floor heave, along a deepwell soft broken rock stratum roadway floor at fixed intervals, the 3-5 jet grouting piles are symmetrically constructed to the two sides of each cross section with the center of the roadway cross section as the boundary at intervals, and the 45-degree base angle jet grouting piles and the 0-degree vertical jet grouting piles are distributed on the same cross section. According to the method fortreating the deep loose and soft rock stratum roadway floor heave through the jet grouting piles, the pressure transmission path of the two sides of a roadway to the floor can be cut off, squeezing formed to the floor is weakened, and deformation is inhibited; the floor rock stratum is detected in advance so that the jet grouting piles can be reinforced to the floor hard rock stratum; and the problem of reinforcing of the loose and broken roadway floor with poor anchability and groutability is solved, under the condition that an original structure of the roadway is not destroyed, strong reinforcing measures are taken on the original loose rock stratum, the construction difficulty cannot be increased with increasing of the mining depth, and the stability of the roadway is improved comprehensively.

Description

technical field [0001] The invention relates to a method for controlling the bottom heave of a roadway in a well, in particular to a method for controlling the bottom heave of a roadway in a deep soft rock stratum with a jet grouting pile. Background technique [0002] Aiming at the problems caused by the bottom drum of the roadway in loose coal rock, such as: firstly, the cross-sectional area of ​​the roadway becomes smaller, which is not conducive to ventilation; secondly, the floor of the roadway becomes uneven after the bottom drum, which is not conducive to transportation and pedestrians are not safe. It may make the lane height unable to meet the normal walking requirements of workers; in addition, the bottom drum will also affect the stress state and stability of the roof and the two sides, which will cause a series of changes in the load-bearing structure and the force-bearing mode of the supporting components. , thus changing the overall stability of the roadway. T...

AI Technical Summary

Problems solved by technology

However, for deep weak and broken rock formations, the effect of pressure relief method is not good, and the use of bolt reinforcement and grouting can not achieve the ideal effect. , but the cost is too high and the operation process is complicated

[0004] Chinese patent application 201220518121.1 discloses a kind of anti-arch type sleeper to control the bottom drum of the roadway. Although this method overcomes the disadvantages of the traditional reinforcement of the bottom plate, if it is applied to the deep well soft rock roadway, the loose bottom plate still cannot be solved. To achieve effective control; when using reinforced concrete walls, such as Chinese invention patent 201210307001.1, due to construction difficulties, the height of the wall is greatly limited, and it is impossible to penetrate deep into the roadway floor to stabilize the rock formation, and it is difficult to achieve satisfactory results in the end

In addition, Chinese patent application 201520403496.7 also discloses a beam-anchor combination structure to prevent the bottom heaving of soft rock roadway. not meet the requirements

Images