Experiment Study on Grouting and Pilot Support Plan of Mine Roadway Passing Through Sand Layer

In combination with the construction of a new transportation adit in Xiayukou Mine, a site experiment study was conducted on the pilot support method of the mine roadway passing through sand layer.During the experiment process, two grouting and pilot support technologies with Marithan and sodium silicate-calcium chl oride were applied Among that, the reinforced solids expansion diameter of Marithan grouting was only 281 mm and there was no variation law of the expansion diamet er.The reinforced solids expansion diameter of sodium silicate-calcium chloride grouting could reach to 401.2 mm.The expansion diameter would steadily reduced along the grouting pipe direction.An overlapping method with two meters long circulated solids was provided for the compensation.The site experiment results showed that the pilot support technology with sodium silicate-calcium chloride grouting could well solve the floor cracking in the mine roadway heading process in sand stratum and the uneven subsidence of the surface buildings.