类矩形盾构同步注浆可视化试验技术与分析

Analysis of Synchronous Grouting of Quasi-Rectangular Shields Based on Visual Test Technology

随着城市建设的发展,地下空间资源也日益紧缺,传统圆形盾构隧道断面利用率低的缺点也凸显出来。因此断面利用率较高的异形断面盾构隧道不断出现,其中类矩形盾构隧道是近年来较为热门的研究方向。在盾构隧道施工中,同步注浆是控制地面沉降及上浮、保障施工顺利进行的重要环节,而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研究涉及很少。与圆形盾构相比,类矩形盾构隧道由于其扁平度较高,会导致浆液产生淤积,不利于缝隙的填充,容易产生浆液充填不均匀等现象,因此更加需要对浆液在盾尾间隙中的流动过程进行深入研究。文章通过利用有机玻璃类矩形盾构隧道模型进行同步注浆过程的模拟试验,对浆液在缝隙中的充填过程和试验过程的可视化进行了分析;通过得到的数据与照片等,结合相关分析软件,深入地探究了类矩形盾构隧道注浆压力的分布形式以及浆液的流动充填机理。

With a rapid growth of city construction and an increasing shortage of underground space,the quasirectangular shield tunnel shows great advantages on section availability compared with the common circular shield tunnel.Synchronous grouting is an essential step for ensuring safe and smooth shield construction,but traditional researches mainly focus on grouting effect and give little consideration to the flowing and filling mechanism of grout.Considering that quasi-rectangular shield tunnel may cause grout deposition and uneven filling due to special section shape,thus it is necessary to further study of flow process of grout at shield tail.A simulation test was carried out for the synchronous grouting and an analysis was conducted for grout filling and test visualization by using an organic glass model of a quasi-rectangular shield tunnel.Pattern of grouting pressure distribution and mechanism of grout flowing and filling were studied based on the collected data,photos,and relevant analysis software.