Research on the Interaction and Deformation Control of the Adjacent Deep Foundation Pits Excavation
Taking the phased excavation of the Datie deep foundation pit and the 02B area deep foundation pit at the Beijing Municipal Administrative Center Station Comprehensive Transportation Hub as examples,a localized re-fined model is established through numerical simulation to study the deformation characteristics and influencing fac-tors of adjacent deep foundation pit excavations.Measures for controlling the deformation are proposed.The research indicates that during the adjacent construction of deep foundation pits,the initially excavated pit tends to move to-wards the direction of subsequent excavation.The surface settlement deformation between the pits transitions change from a concave trough to a double peak pattern;Based on the different slopes of the fitted displacement curves,the impact zones can be classified as follows:the area with d＜2his the strong influence area,the one with 2h≤d＜4h is the secondary influence area,the one with 4h≤d＜6hi is the weak influence area,and the one with d≥6h is non-influence area;In order to ensure the overall stability of the construction of a cluster of deep foundation pits,the optimal excavation sequence is simultaneous excavation.If phased excavation is necessary,priority should be given to excavating pits with support structures of higher stiffness and stronger support force;The deformation control can be achieved by promptly installing inclined struts in the counter-working area.
adjacent deep foundation pitsimultaneous excavationinteractionsdeformation control measures
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