王刚 董俊杰 司法强 刘天龙 窦永杰

【摘 要】杭州萧山国际机场三期项目新建航站楼基坑面积共计7.9万m2，基坑围护结构相对较复杂，北侧临近地铁站，南侧与航站楼地下空间开发区域相连，东侧靠近交通指挥中心，西侧靠近市政道路，车流量较多。且主楼基础位于既有人工湖上，需对人工湖水系改造完成后进行清淤分层回填，工况比较复杂。基坑围护采用三轴水泥土搅拌桩、灌注桩排桩、TRD工法等厚度水泥土搅拌墙、高压旋喷桩、MJS工法桩等围护结构。本次重点介绍TRD工法在深基坑的应用。根据之前成功案例可以看出其有良好的止水性及适应性，验证了在不同土质中进行TRD工法施工的可能性及可靠性。

【关键词】深基坑围护;TRD原理;施工工艺

Application of TRD Method in Deep Foundation Pit of Terminal Building

Wang Gang，Dong Jun-jie，Si Fa-qiang，Liu Tian-long，Dou Yong-jie

（China Construction Eighth Engineering Bureau Co.， Ltd Hangzhou Zhejiang 310000）

【Abstract】The foundation pit area of the new terminal building of Hangzhou Xiaoshan International Airport Phase III project totals 79，000 m2， and the foundation pit retaining structure is relatively complex. The north side is adjacent to the subway station， and the south side is connected to the underground space development area of the terminal building. Close to the traffic command center， the west side is close to the municipal road， and there is a lot of traffic. The foundation of the main building is located on the existing artificial lake. It is necessary to carry out dredging and stratification backfilling after the completion of the artificial lake water system reconstruction， and the working conditions are more complicated. The foundation pit is protected by three-axis cement-soil mixing piles， cast-in-situ piles， TRD method and other thick cement-soil mixing walls， high-pressure jet grouting piles， MJS method piles and other envelopes. This time， we will focus on the application of the TRD method in deep foundation pits. According to the previous success stories， it can be seen that it has good water repellency and adaptability， and verified the possibility and reliability of TRD construction in different soils.

【Key words】Deep foundation pit protection;TRD principle;Construction technology

1. 引言

隨着我国科学技术的不断发展，在工程领域深基坑围护中，各种新型技术不断应用到基坑工程中，近年来，大、中型机械设备、大功率、强动力施工机械不断问世，更加推动了深基坑工程理论和施工技术的发展。自2009年以来国内引进TRD施工技术及配套设备，近几年来在多地多个项目已成功实践并投入使用。该工法适用地层广，水泥土墙体搅拌成墙效果好，止水效果明显，为复杂地层、嵌岩、复合围护结构或深基坑止水帷幕构筑，提供了一种可供选择的新型技术方法和配套设备。

2. 原理

通过动力箱液压马达驱动链锯式切割箱，分段连接钻至设计深度，水平横向切割至一定长度，在切割过程中注入切割液（膨润土拌制），再回撤切割至原始点，再成墙搅拌过程中在切割箱底部注入水泥浆固化液，使固化液与搅拌土体强制拌合，形成等厚度水泥土搅拌墙，通过插入型钢以增加搅拌墙的刚度和强度。……