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Abstract Taking the deep foundation pit of open-cut tunnel in Xiamen City for example，safety monitoring is carried out on the surrounding environment as well as on supporting structure itself during the construction period. The monitoring measures for the safe construction of deep foundation pit mainly include tour check，settlement，horizontal displacement，deep displacements，underground water level，axial stress of anchor and blasting vibration，etc.. Combined with the geology condition and in-situ construction environment，the monitoring results are comprehensively analyzed on the surrounding environment as well as on supporting structure. Research results show that geology condition is the main factor that causes the difference of deformation distribution. Large displacement will appear after the creation of new free face，so the stability of the retaining pile are affected. When the blasting excavation is applied on the deep foundation pit，the selection of design parameters are demanded to further verify their rationality. Monitoring and analysis are carried on dangerous situation such as high displacement velocity of the supporting pile，landslide and collapse of slope etc.；and the monitoring results show that emergency measures relevant to the dangerous situation are reasonable and effective.
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Received: 24 August 2012
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2013, Vol. 32 
