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Abstract The principle of constructing basement nested in existing building is discussed. A indoor compensation method that compensates foundation worked expectedly under the influence of live loads on floor，and the coefficient confirmed to calculate foundation soil stress by multiplying live loads on floor are presented. Based on the proposed principle，the total loads of the underground space to be built can be balanced and compensated by the summary of no less than the following parts：one is the soil weight of foundation pit；the other is a part of the pre-consolidation pressure which mainly comes from the soil stress of floor live load. A construction case is illustrated. The research results and the engineering practice both show that the indoor compensation method was suitable to applying to constructing basement nested in existing building. As the excavation depth and the increased loads was determined according to the method，the foundation soil deformation affected by the indoor excavation and construction would no longer threaten existing building?s stability and would reduce the risk of damage to the existing building.
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Received: 30 May 2013
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2014, Vol. 33 
