纳米材料在隧道初支喷射混凝土中的试验研究

Experimental Study of Nano-materials in Shotcrete for Initial Support of Tunnel

针对某高速公路隧道施工中喷射混凝土回弹率较大、掉块较多、一次喷射厚度小,且受材料变化影响、以及湿喷机设备泵管直径小,泵管弯头多、角度大等影响,容易出现堵管现象,采取在喷射混凝土中加入一种纳米材料,能改善工作性能、增加混凝土间的粘结力、回弹率可降低至10%以下、提高一次喷射厚度和平整度一次性合格率,提高施工效率,节约成本,可以推广应用。

For an expressway tunnel shotcrete has a high reduction of rate,many dropped blocks,small shot thickness,and the affecting of changes in materials,as well as the small diameter of the pump pipe of the wet spray equipment,the number of turns and the large angle of the pump pipe offen cause the pipe plugging.The use of a nano-material in sprayed concrete can improve work performance,increase the adhesion between concrete,the rebound rate can be reduced to less than 10%,increase the thickness of one shot and flatness,and improve the construction efficiency,save costs,it can be widely applied.