| Through investigating the gound-layer specialities of HeXi district of Nanjing city ,we hope to find a supporting form suitable for foundation pit engineering, whose excavating space is small, whose excavating time is limited strictly, his cost is controlled strictly too. I think the finding work is extremely important for overall construction in HeXi district.Through detailed studing the engineering geology condition about HeXi district ,I prefere Compound Soil-Nail Supporting Technology more suit the 5-7 metres deep foundation pit to common Soil Nail Supporting Technology. Among common Soil Nail Supporting Method, Cement-Soil Gravitational Wall ,Cement-Soil Mixing Pile Supporting ang Compound Soil-Nail Supporting, Compound Soil-Nail Supporting is more economical and safe.1,Through investigating the gound-layer specialities of HeXi district of Nanjing city , we think Compound Soil-Nail Supporting Technolo gy is more suitful to the soft ground district than common Soil Nail Supporting Technology.2,Through analyzing the datas on supporting dasign, supporting construct and foundation pit supervise, the thesis proves the Compound Soil-Nail Supporting Technology is reliable.It raises the changing regulars about Soil Nail with curtain for cutting off water,about Soil Nail with prestressed anchors with curtain for cutting off water.3,Considering the soil in foundation pit will rise gradually, the partial curtain for cutting off water will be cut off and curved, the thesis proves the dasign method of Compound Soil-Nail Supporting Technology which will be used in soft gound in HeXi district.4,Though engineering practice, the thesis provides the scientific parameters for the the Compound Soil-Nail Supporting design and construction.5,The finite element analysis of composite soil nailing was discussed. Through analyses work, we know the work ability for soil nailing combined with mixed cement-soil piles and prestressed anchors. |
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