Meikuang Anquan (Mar 2020)
Water-spraying Grouting Technique for Roof of Roadway in Structural Fracture Zone
Abstract
Aiming at the problems of deformation of surrounding rock, cracking of grouting layer and roof watering in the structural fractured area of western rail roadway of Zhaozhuang No. 2 well, based on the analysis of the source of dripping water on the roof of roadway and the structural characteristics of surrounding rock, the principle of dripping water treatment in this roadway is proposed. And through the method of field test, the paper analyzes the grouting construction sequence, grouting pipe fixation, hole sealing technology and grouting pressure. The industrial test shows that the joints and fissures in the shallow part of the surrounding rock are channeled through the structural fissures and the fissure aquifer of the roof of the roadway, which is the cause of the water pouring on the roof of the roadway. The cumulative grouting construction process of “first two walls and then roof, two walls from bottom to top, roof from both sides to the middle” was proposed, and the grouting pressure of the roadway roof was determined to be 2 MPa to 3 MPa, and the grouting pressure of the roadway top was 4 MPa to 6 MPa.
Keywords
