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Abstract The development and utilization of urban underground space have made it critically important for the stability evaluation of deep pits. In this paper，through analyzing the monitoring data from the project of Mass Media Mansion Underground Garage，the stability of pile-bolt supporting system in deep foundation pits was evaluated by adopting the linear-fitting control chart method. The results show that，(1) an abnormal horizontal displacement at the point five meters below the pile top can be observed，(2) the abnormal pit top settlement basically occurs between May and June，and (3) both the horizontal displacement of the supporting piles and the pit top settlement are within the allowable value. The monitoring data of the foundation pit were fed back to construction units in order to take effective measures for the purpose of security and stability of the foundation pit. Accordingly，this technique adopted is able to timely locate the abnormal monitoring points，which contributes to the decision-making of taking early-warning measures.
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Received: 20 May 2013
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2014, Vol. 33 
