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《Chinese Journal of Underground Space and Engineering》 2010-03
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Study on the Effect of the Top-Down Construction of Interior Wall during Swirling Pool Excavation

Fang Qi1,Feng Yonggang2,Zhang Fengyong2,Chai Weixia2(1.Shanghai Tongji Engineering Consulting Co.,Ltd Shanghai 200092,China;2.Construction Subcompany,CMTCC ShanghaiShisanye Construction Co,Ltd,Shanghai 201900,China)  
The Wuhan E-steel factory rotation flow sedimentation tank is an underground structure with a depth of 36.5 meters and a diameter of 26 meters.There are soil layer and rock layer within the depth of the excavation.Continuous diaphragm wall combined with top-down constructed interior wall is used as retaining structure.The interior wall is divided into six segments and constructed in soil layer and rock layer.The continuous diaphragm wall is only constructed in soil layer.The FEM software ANSYS is used to simulate this excavation under two different conditions,with or without top-down construction of interior wall.Stress and displacement of retaining structure and rock were analyzed.Results show that the interior wall restricts the displacement of the continuous diaphragm wall and the envelope rock.Its effectiveness is related to the lateral displacement of the continuous diaphragm wall.If the lateral displacement of the continuous diaphragm wall is relatively low,the effects of the interior wall will be limited.Based on the conclusion,suggestions are given to optimize the construction method.
【CateGory Index】: TU476.3
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