沉管隧道砂流法地基处理中施工边界影响机制及工艺参数研究

项目名称： 沉管隧道砂流法地基处理中施工边界影响机制及工艺参数研究

项目编号： No.51508200

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 建筑科学

项目作者： 黎伟

作者单位： 华南理工大学

项目金额： 20万元

中文摘要： 本课题针对沉管隧道砂流法地基处理，采用模型试验方法及两相流理论，研究多种施工边界条件对砂流的影响机制及工艺参数。主要研究内容：（1）、多种施工边界条件对砂流法地基处理的影响机制分析；（2）、砂流法地基处理工艺参数及控制方法研究；（3）、砂盘地基的施工沉降性能参数分析。.通过改进的砂流法模型试验模拟不同边界条件下的砂流法过程，测取边界处的砂盘动态特征及工艺参数；采用数值仿真方法分析多边界条件下不同砂盘形态时的基槽流场，探讨施工边界处砂盘成型所需的流场形态；基于两相流理论，针对施工边界处的砂水流采用“分离—耦合逐步逼近”方法建立短时域内砂水流中砂颗粒的速度场及颗粒运动轨迹；探讨边界条件对砂流法处理过程的影响机制，提出有效的砂流法地基处理控制方法和工艺参数，为优化砂流法施工边界设置提供理论依据及方向。.本研究具有较好的创新性，成果具有切实的理论意义和广阔的应用前景。

中文关键词： 沉管隧道；地基处理；砂流法；施工边界；工艺参数

英文摘要： This subject aims at the foundation treatment method of immersed tube tunnel using sand flow method, adopting model-test method and the two-phase flow theory, a variety of construction boundary conditions on the impact of the mechanism and technical parameters of the sand flow will be researched. The research contents are as follows: (1) a variety of construction boundary conditions on ground handling sand flow method impact mechanism analysis; (2), technology parameters for the treated foundation by sand flow method and the research of control methods (3), analysis of construction subsidence performance of sand tray foundation..Improved test simulates sand flow method models through different processes of sand flow method under boundary conditions, the measured take sand tray dynamic characteristics and process parameters at the boundary; numerical simulation analysis based Fluid Flow Multi boundary conditions are different sand tray shape when, To investigate the flow pattern at the boundary of construction required for molding sand tray; based on two-phase flow theory, for the construction of sand flow at the border a separation-coupled stepwise approach method to establish short-term flow of sand within the sand particles and particle velocity field trajectory; explore the boundary conditions on the sand flow method processes influencing mechanism, proposed an effective method of foundation treatment of sand flow control methods and process parameters, providing a theoretical basis and direction for the optimization of construction sand flow method to set boundaries..This study has some innovation, and this work has significant theory meanings and broad application outlooks.

英文关键词： Immersed tube tunnel;Foundation treatment;Sand-flow method;Construction border;Construction parameters