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Abstract Based on a deep foundation pit supporting engineering with excavation depth 19.55 m，the ground situation and surroundings as well as engineering geology are analyzed；and a composite support plan combining the soil-nailed wall with pile-anchor system is proposed to make use of their respective advantages. The technique of artificially excavated piles is adopted for the cobble stratum to solve the problems that power drilling brings about. The maximum value of horizontal displacement is only 12.1 mm and the mechanical properties of each support element are all in working consequence. The support result illustrates that the design is reasonable and the displacement of the pit is controlled effectively. Meanwhile，the work is completed 11 days ahead of the construction arrangement，which leaves much time for the following work. The experience is valuable for the similar projects.
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Received: 04 September 2007
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