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(1 ) The volume of the mine roadway should be able to accommodate the amount of ore that has collapsed;
(2 ) Each time it collapses after venting, the bottom structure should have sufficient strength to withstand the impact load on which the ore falls on the ore.
(3 ) The slope angle of the mine roadway and the mine roadway shall not be less than 50° to ensure that the ore can be emptied.
The structure of the bottom structure is related to the mining equipment used and the method of forming the bottom layer. In actual work, there are two types of electric discharge and discharge from the scraper.
The bottom method is shallow hole and deep hole (including medium and deep hole). The former is advantageous for controlling the shape regulation of the ore and mining roadway, but the worker is working in the empty field and the safety is poor.
Out of the explosion force of the mine haulage nugget base structure is an example of the Swedish Patent Malmberget iron ore. The ore body has a dip angle of 40° and a thickness of 14 m . The surrounding rock is a gneiss that is not stable enough, with a height of 48m and an oblique length of 80m. The top plate is reinforced with a steel rope mortar drill pipe. The diameter of the steel rope is 20 mm , and the 2100 m2 top plate is reinforced with 100 anchors . Mining with a Cat980 scraper. The ore depletion rate is 4.8% .
It is worth noting that: the drill pipe and the blasting hole of the reinforced roof are well laid once. After the steel rope mortar anchor is installed, some blastholes in the ore body are still used as the porch.
The design of the bottom structure of the explosive force transport should pay attention to the following characteristics :