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Abstract The diversity of geological conditions determines the variety of the pit supporting engineering in Guangdong. Thus，different kinds of supporting patterns are used in Guangdong，which are rare in our country. Some new progresses and understandings are introduced in the paper，including the impact of precipitation on the surrounding environment and ways to deal with it，analysis of some different treatments with different results on the water in the bottom of pits and reasonable treatments，problems and countermeasures of the lateral displacement of piles generated by earthwork excavation in soft soil. Except that，some new and successful supporting types and the applications of the double-row piles method，top-down method and mid-island method are also discussed. Finally，the further study of some theoretical issues are proposed in the practice of pit supporting engineering，such as reasonable calculation of the force of prestressed anchor cable，the calculation mode of earth pressure，control of the pit displacement，reasonable supporting patterns in the deep soft soil and water and earth pressures in the residual soil. All these new and challenging scientific problems require further research.
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Received: 17 July 2012
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2012, Vol. 31 
