A method of roadside side support with constant resistance of hard roof
A technology of hard roof and roadside support, which is used in earth-moving drilling, pillar/support, wellbore lining, etc., can solve the problem that the support has not been well solved, and the applicability of gob-side entry retention has not formed a perfect theoretical system, etc. problems, to achieve the effect of eliminating roadside support failures, meeting safety and reliability requirements, and easily controlling construction costs
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[0067] Take the roadway with a hard roof in a coal mine, and the structure of the constant resistance pressure pad as an externally injected single hydraulic prop with a short and thick live column as an example:
[0068] The height of the roadway is H=2.5m, the span is 3.8m, and the sinkage of the roof is 0.8m; A certain number of metal pressure anchor rods are evenly installed.
[0069] When supporting the gob-side retaining roadway of the hard roof, the supporting method includes the following steps:
[0070] (1) In the roadside support process of the roadway with a hard roof along the gob-side retaining, firstly, according to the expected deformation of the roadway, design the constant resistance yield height Hr=0.8m and the height of the roadside filling body Hc=H-Hr= 2.5m0.8m=1.7m.
[0071] (2) Then build a high-strength filling body (concrete column) on the floor on both sides of the roadway, with a compressive strength of 25MPa, a width of 1.5m, and a height of 1.7m....
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