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我国分布有大量软土地基,尤其以江浙沿海一带分布更为广泛。在软土地基上修筑的路基产生较大的沉降变形,严重影响工程安全。因此,改进现有的地基沉降计算及预测方法,使沉降的计算值与实测值更接近,具有重要意义。以嘉兴至绍兴跨江通道南岸接线工程为背景,改进Fox一维大变形固结模型CS2,并编制FORTRAN计算程序。改进的CS2模型考虑了固结过程中土性参数的非线性变化,是一个计算软土路基沉降的非线性差分模型。通过模拟路堤填筑地基沉降固结过程,验证了该模型应用于软土路基沉降计算的适宜性。
China has a large number of soft ground distribution, especially in Jiangsu and Zhejiang coastal areas are more widely distributed. Subgrade construction on soft soil foundation will cause large settlement deformation, seriously affecting the safety of the project. Therefore, it is significant to improve the existing methods of foundation settlement calculation and prediction so as to make the calculated settlement value closer to the measured value. Taking the connection project of south bank of Jiaxing-Shaoxing cross-river channel as the background, the Fox one-dimensional large deformation consolidation model CS2 is improved and the FORTRAN calculation program is compiled. The improved CS2 model considers the nonlinear change of soil parameters during the consolidation process and is a nonlinear difference model for calculating the settlement of soft soil subgrade. By simulating the settlement and consolidation process of embankment filling, the suitability of this model for the settlement calculation of soft soil subgrade is verified.