【作者】 沈永芳；

【导师】 黄醒春；

【作者基本信息】 上海交通大学 ， 岩土工程， 2012， 硕士

【摘要】 舟山沈家门港隧道为国内首次采用沉管法施工的海洋水下隧道,基础采用管内注浆法进行处理。目前国内对大型沉管隧道混凝土管段水下注浆基础处理的施工工艺、作用机理、应用效果等方面的研究较少,没有类似的工程实施经验。为了研究沉管隧道基础注浆的相关工艺参数以及无损监测方法的适用性、可靠性,建立快速、简便、准确和经济的注浆充填效果无损探测方法,本文对舟山沈家门海底沉管隧道注浆进行了等比例模型试验研究,建立了充填效果的实时监测方法和评价系统。研究内容主要分为两部分:1、现场注浆模型试验:根据已确定的配合比、基础及管段设计几何条件、基槽及其回淤条件及现场工况进行等比例模型试验,研究注浆扩散特性、砂浆强度特性,监测注浆压力、注浆量、扩散半径等数据,分析相互之间的关系,提出适合舟山沈家门沉管隧道管底注浆的相关施工工艺要求和参数。2、现场注浆效果检测与评价方法研究:采用探地雷达、面波仪等无损检测的方法,对注浆充填效果进行检测,与观察的结果进行比较,探索出沉管管底注浆充填效果无损探测方法。试验研究表明:模型试验注浆压力最大值10kPa,注浆管横向方向孔间距为6m,纵向方向孔间距为5.75m,可达到了预定注浆充填范围同时确保了隧道管段的总体抗浮性能。采用探地雷达法、面波法均可有效检测注浆过程浆液流动状态并推断浆液扩散到达的界面位置。相比较而言,面波法更为直观、可靠。更多还原

【Abstract】 Zhoushan Shenjiamen Harbour tunnel is the domestic first ocean underwater tunnels using immersed tube construction method. Its foundation will be treated by tube grouting method. At present, the problems of underwater foundation grouting process for the large-scale concrete tube sections of immersed tube tunnel, which include construction technology, function mechanism, application effect and other related aspects, are studied less in our country. There is no similar experience of engineering practice. In order to study the related technology parameters of foundation grouting and the applicability and reliability of non-destructive monitoring methods for immersed tube tunnel, and then establishing a rapid, simple, accurate and economic non-destructive method for detecting grouting effect, the same scale model test of foundation grouting has been carried out for Zhoushan Shenjiamen Harbour immersed tube tunnel, real-time monitoring methods and evaluation systems of the filling effect have been established in this paper. The research contents are divided into two parts as follows:1. Field grouting model test: Based on determined grout mix, designed geometry size of foundation and tube, foundation trench and its back silting conditions and on-site working conditions, the same scale model test have been using in studying the diffusion characteristics of grouting, strength characteristics of mortar, monitoring some data (such as grouting pressure, grouting volume and diffusion radius etc.) and their relationship analysis. The relevant technology requirements and parameters of foundation grouting construction have been proposed for Zhoushan Shenjiamen immersed tube tunnel.2. Research on method of detection and evaluation for on-site grouting effect: The effect of grouting has been detected using non-destructive testing method (such as ground-penetrating radar and surface wave instrument, etc.). By compared with the results of observations, the non-destructive detection method of grouting filling effect for immersed tube bottom has been explored.Test studies have shown that can reach a predetermined range of grouting and ensure general anti-floating performance of tunnel tube sections when the maximum grouting pressure is 10kPa in the model test, the horizontal direction distance is 6m and the longitudinal direction distance is 5.75m for the grouting pipe hole. It can detect effectively flow state of grout and infer grout spread to reach the interface position in the grouting process using ground-penetrating radar and surface wave method. In comparison, the surface wave method is more intuitive and reliable.更多还原