Study On The Mechanism Of Limit Suspension Aftermining And The Application Of The Roadway Along Goaf In Coal Roadway

For roadway roof postharvest limit suspended roofs, based on theoretical analysis, numerical simulation and engineering verification in a comprehensive way of different roof roadway limit the roof hanging from the mathematical equation, analysis the different factors on the ultimate suspension affected top, explains the limit of roadway roof top hanging mechanism, based on the research results proposed close distance coal seam roof cutting roadway along Goaf Technology, it is concluded that the main conclusions are as follows:(1) The paper based on the conditions of three kinds of typical roof, through the establishment of the corresponding mechanics model were obtained mining roadway roof ultimate overhang distance calculation expression:hard rock roof of roadway, roadway in deep mine roof respectively.In the case of close distance coal seams without taking a passUnder the through circumstancesBy sensitivity analysis, the factors affecting the situation of hard roof Roof roof overhang from the analysis and evaluation of the results showed that plastic zone width on the roof overhang from the largest, followed by the order of the width of the roadway, ultimate tensile strength, support strength, anchoring strength, layer thickness, and finally mining depth.(2) Experimentally determined roof and floor rock mechanical properties, and test the basic performance parameters of mine bolt. FLAC3D using numerical analysis software to simulate the intensity of support Deep lane roadway roof flap top limit the impact from the ground, Lane offshoot retaining strength hanging from the top of the impact of extreme close-seam coal wall strength of the hard roof flap top limit of the roadway state influence. The results show that for different lane supporting strength, lateral flap top is affected, when the supporting strength reaches a certain value, then increase the intensity of the lateral overhang length on top of the very small. The simple improvement of coal wall strength has little influence on the lateral suspension roof of roadway roof, and it won't change the distribution law of the lateral and lead bearing pressure of the working face. Roadside support strength of roadway roof overhang effects are larger and have a range of effects, compared to no roadside support hanging roof length increases by about 50%.(3) Based on the research results describes two engineering applications, given close toppers seam along goaf side roadway roadway support reasonable basis for determining the resistance, stability control and offshoot roadway support structure proposed criterion proposed Roadway follow the principle of protection technology. Clear the floor after hard rock mining hazards, it introduces the treatment of roof strength, and gives the basic parameters of the pre-split hard roof.(4) Limit distance seam suspended from the top of the toppers for Gob Roof technology and post-harvest treatment is significant, according to the actual needs of engineering applications on top of the roof overhang distance limit requirements, flexibility to adjust the left lane roadway width, strength, strength and other parameters beside the roadway anchor support.