摘要
冻结法广泛用于盾构隧道的旁通道施工,但设计上对于冻结引起的作用在隧道上的冻胀力还没有明确取值方法,其主要原因之一是缺乏现场测量数据。以上海长江隧道的旁通道施工为背景工程,采用新型土压力计监测。首先介绍了PAD式土压力计的基本特征和安装方法,然后介绍了自动数据采集和测点设置原则,接着通过实例重点说明电缆保护的重要性和保护措施。上述监测工作保证了全部5个土压力计的正常工作,并获得了有效的实测数据。数据显示,冻结工法造成的最大荷载增量远小于预期值,这主要是由于施工上设置了泄压孔,从而减少了作用在管片上的冻胀力。
Artificial freezing method is widely used in construction of cross passage for shield tunnel, while due to lack of measurement data, no clear rule for determining frost-heave force is given for tunnel design. Based on the Shanghai Yangtze River Tunnel project, a careful in-situ monitoring is carried out by utilizing a new type earth pressure gauge. Firstly, the main characteristics of PAD type earth pressure gauge and the installation method are introduced. Secondly, the automatic data collection system and the layout of measuring points are described. Aforementioned efforts successfully protect all 5 gauges, and valid data are obtained. The data show that the maximum measured frost-heave force is much smaller than the prediction. It is due to the countermeasure of pressure release hole, which reduced the frost-heave pressure on segment.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2011年第8期2555-2560,共6页
Rock and Soil Mechanics
基金
上海市科学技术委员会的资助(No.08PJ1406600)
深部岩土力学与地下工程国家重点实验室开放基金资助(No.SKLGDUE08008B)
上海市重点学科建设项目(No.B208)
关键词
冻胀力
现场监测
盾构隧道
PAD式土压力计
frost-heave force
in-situ monitoring
shield tunnel
PAD type earth pressure gauge
