U steel arch is a kind of passive support for coal mine support, which has high tensile strength, compressive strength, good toughness, high supporting force and strong support strength, and can be used many times, and is widely used in mine roadway, especially in deep complex roadway and soft coal seam roadway.

The best stress state of the U steel arch bracket is to make it uniformly compressed after the wall is filled tightly. When the pressure value of surrounding rock used on the U steel arch bracket reaches a certain value, the bracket will be compressed, which will reduce the pressure of surrounding rock acting on the U steel arch bracket, thus avoiding the damage of the bracket because the pressure of surrounding rock is greater than the bearing capacity of the U steel arch bracket.

Compared with other rigid supports, U steel arch have contractibility, stable and reliable bearing capacity, adapt to the load and deformation of soft surrounding rock, have high cross-section utilization rate, convenient support, small maintenance amount, high recovery and reuse rate of supports, reduce the use of timber, and have obvious environmental benefits.

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