【摘要】 以南京市绕城公路拓宽工程软基加固为例,探讨现浇薄壁管(PCC)桩的应用,并对地基加固效果进行初步分析与评价.选取桩号为K4+120,K6+920,K6+986的3个典型的观测断面进行沉降、沉降速率、水平位移观测成果分析.结果表明,PCC桩复合地基可有效地控制加宽路基自身的沉降、与老路基间的差异沉降和路基的稳定性,可以满足施工控制标准,具有沉降收敛快,工后沉降小的特点,荷载-沉降曲线呈缓变形特点,与文献得到的结论一致.更多还原

【Abstract】 Taking the ring highway widening project in Nanjing as example,the application of cast-in-situ thin-wall concrete pipe pile(PCC) to strengthen the soft foundation is discussed,the strengthening effect is analyzed and evaluated.The settlement,settlement rate and horizontal displacement of 3 typical sections with piles marked K4+120,K6+920 and K6+986 respectively are recorded and analyzed.It′s indicated: PCC pile composite foundation can effectively control the settlement at widening road,reduce the difference of settlements between widening road and origin road,and increase the embankment stability.PCC pile composite foundation meets the construction controlling standard,possesses the advantages: rapid settlement convergence,the small settlement after construction,slow deformation of the curve between load and settlement.These conclusions agree with the ones in references.更多还原