Abstract：The monitoring and theoretical studies for deep excavation are lack in Beijing. The monitoring results of deep excavation of China World Trade Center Tower phase 3 in Beijing during excavation process are analyzed. The study results show that：(1) Under normal circumstances，the displacement of pile-anchor bracing system is generally not more than 0.1%H，where H is the depth of foundation pit. (2) The stress of reinforcement in pile is usually only 1/10–1/8 of design strength. (3) The actual tension of anchor is smaller than the design value，which shows that the adopted earth pressure in the design of support system is larger than the actual earth pressure. (4) The tensions of each row soil nailings are all less than 38 kN，which is far less than the design value calculated by current regulations. It is found that the actual steel stress，anchor tension and soil-nailling tension are all less than the current theoretical values. The monitoring results can provide a reference to the similar projects and the basis for amendments to the subsequent procedures.
张钦喜，陈 鹏，尹文彪. 国贸中心三期基坑支护工程监测研究[J]. 岩石力学与工程学报, 2012, 31(11): 2319-2326.
ZHANG Qinxi，CHEN Peng，YIN Wenbiao. MONITORING AND STUDY FOR SUPPORT ENGINEERING OF DEEP EXCAVATION OF CHINA WORLD TRADE CENTER TOWER PHASE 3. , 2012, 31(11): 2319-2326.
郝文朝，高华东. 北京城铁东直门车站土压力现场监测[J]. 建筑技术，2003，34(2)：113-114.(HAO Wenchao，GAO Huadong. In-situ measurements of earth pressure on retaining structure at Dongzhimen Subway Station in Beijing[J]. Construction Technology，2003，34(2)：l13-114.(in Chinese))
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2012, Vol. 31 
