Research and application of hydraulic slotting slot morphology control technology in soft coal seams
In order to solve the problems of difficult control and easy collapse of slot development during ultra-high pressure hydraulic slotting in soft coal seams(f＞0.2),the stress distribution law of the coal body around the sloting slot was analyzed through theoretical analysis methods,and the influencing factors of the plastic zone distribution of the coal body around the sloting slot were obtained.We studied the law of high pressure water jet breaking coal and found that the main factors affecting the morphology of the slotting slot are slotting pressure,nozzle diameter,and the hardness of the coal body itself.A ultra-high pressure hydraulic slotting slot morphology con-trol technology based on the characteristics of soft coal seams was proposed,and the key parameters for controlling the depth,width,and development speed of soft coal seam slots were obtained,including slotting pressure,nozzle diameter,and pressure adjustment speed.Through on-site application,it has been shown that the reasonable parameters for controlling the slot morphology of soft coal seams are as follow,the diameter of the slotting nozzle is 2.5～3.0 mm,the slotting pressure is 70 MPa,and the slotting pressure adjustment inter-val is 3～5 minutes.The applicability of the hydraulic slotting slot morphology control technology in soft coal seams has been verified,which can effectively improve the success rate and safety of hydraulic morphology construction in soft coal seams.
soft coal seamshydraulic slottingslot morphologyhigh pressure water jet
万方数据
维普
