Huainan Deep Roadway Squeezing Deformation and Its Control Countermeasures

In order to study the squeezing deformation and control measures of soft roadway with high ground stress, according to the measured stress value and surrounding rock mechanical parameters, the stability of surrounding rock is analyzed based on the analytical calculation of Hoek-Brown and finite element numerical calculation, the results show that the deformation and failure is very serious after excavation, the crown displacement and the floor heave amount is very large, which is consistent with the site situation. The deformation of roadway surrounding rock is determined as very serious squeezing deformation according to Hoek squeezing deformation level curve. Based on the stability control theory of deep roadway surrounding rock and the theory of "step by step combined supporting", the control methods of are carried out. Through the finite element numerical calculation analysis and site monitoring, the evaluation of the supporting effect is verified, the results show that the proposed scheme of supporting achieves good effect and can control the squeezing deformation effectively.