Support Technique of Deep Soft Rock Roadway Based on Loose Circle Test of Surrounding Rock

We tested loose circle of the surrounding rocks in 20 m soft rock roadway at +588 level main entry of a coal mine based on surrounding rock loose circle theory. The test results show that the thickness of loose circle is 1.06 m to 1.70 m, and it belongs to the medium loose circle and general unstable surrounding rock, so the original support scheme can not ensure the stability of the surrounding rock. It optimized the support scheme and carried out the in-site experiment based on the test results. It showed that the support scheme can control surrounding rock deformation, and ensure the roadway stable and safe, and can provide reference for other similar roadways.