结合下峪口煤矿新建运输平硐的建设,对穿越砂层巷道的超前支护方式进行了现场试验研究。试验过程中分别采用了马丽散、水玻璃-氯化钙2种注浆超前支护技术。其中,马丽散注浆加固体扩散直径仅为281 mm,且扩散直径变化无规律;水玻璃-氯化钙注浆加固体扩散直径可以达到401郾 2 mm,扩散直径沿注浆导管方向逐渐变小,并提出用长度为2 m的前后循环加固体相互叠加的方法来弥补。从现场试验结果来看,水玻璃-氯化钙注浆超前支护技术很好地解决了砂层巷道掘进过程中面临的地面开裂、地面建（构）筑物不均匀沉降等问题%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 chloride 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 diameter. The reinforced solids expansion diameter of sodium silicate-calcium chloride grouting could reach to 401.2 ram. 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 re- suits 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.
展开▼
