北京地区深基坑墙体变形特性研究

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Abstract In order to clarify the law of lateral deformation due to deep excavation in Beijing，a database of 37 case histories of field monitoring in Beijing is analyzed and the results are compared with worldwide case histories. Research shows that：(1) The maximum lateral deformation of wall mainly ranges from 5 to 25 mm，with percentage of 79.2%；and only 13.5% of that are larger than 30 mm. (2) The general profiles of lateral deformation of bored pile wall are “convex shape”. The distance of position of maximum lateral displacement is from 9 to 13 m below top of wall，and ranges from 0.58H+5 m to 0.58H－5 m. (3) The profiles of lateral deformation of compound soil nail wall are “triangle shape”，with the maximum value at the top of wall and decreasing gradually down. (4) The maximum lateral deformations of all excavations，which range from 0.04%H to 0.218%H，with a mean value of about 0.103%H，increase with the increase of H and length-width ratio. (5) The maximum lateral deformation decreases with the increase of insertion ratio and system stiffness，but it has little effect when insertion ratio is more than 0.6. The results can be used to predict lateral deformation of similar projects in Beijing and other areas，and guide design and constructions；and it also has great significance to preventing the foundation pit accident and avoiding the waste of resources.

Key words： foundation pit engineering Beijing deep excavation deformation characteristics of lateral wall field measurement

Received: 28 April 2012

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http://www.rockmech.org/EN/Y2012/V31/I11/2344

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