类矩形盾构同步注浆大型模型试验

Large Model Test for Synchronous Grouting of Quasi-Rectangular Shield Tunnels

在盾构隧道施工中,同步注浆是保证施工顺利和施工安全的重要环节。目前对传统的同步注浆工艺研究主要局限于注浆效果的研究,而对浆液本身流动及填充机理的研究涉及很少。文章针对类矩形盾构隧道由于其自身几何形状的特性会导致浆液产生淤积,不利于缝隙的填充且容易产生浆液充填不均匀的现象,利用宁波轨道交通3号线类矩形盾构隧道缩尺模型,对同步注浆过程进行了模拟试验分析,通过传感器监测采集压力、沉降量等数据,探究了类矩形盾构隧道注浆压力分布形式以及浆液的流动充填过程。

Synchronous grouting is an essential link for ensuring safe and smooth shield construction.However,traditional researches on the synchronous grouting are mainly confined to the grouting effect while it gives little consideration to the flowing and filling mechanism of grouts.In this paper,considering that quasi-rectangular shield tunnelling may cause grout deposition and uneven filling due to the special section shape,it uses a model of the quasirectangular shield tunnel of Ningbo Metro line3 to take a simulation test for the synchronous grouting,and studies the grouting pressure distribution and the grout flow and filling process based on the pressures and settlements collected by the sensor.