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在其他条件都相同的前提下,将线形、抛物形形、指数曲线形负压分布模式分别应用于京沪高速铁路真空预压试验段竖向排水通道中。运用有限单元法模拟现场地质和施工情况,计算路基固结过程,并将沉降计算结果和坡脚处水平位移计算结果与实测值进行对比分析。对三种分布模式计算结果与实测值的差异原因进行分析,分析发现:竖向排水通道负压分布沿通道由上至下按线性分布假定,即从某一个特定值的方法按线性折减到零或某个特定值的方法不十分符合实际,将导致数值分析的计算结果与实际差距较大。建议在淤泥中,竖向排水通道负压分布采用指数曲线形分布,但在硬壳层深度范围内的竖向排水通道负压分布模式可按线性模式进行设置。
Under the same conditions, the linear, parabolic and exponential negative pressure distribution modes are respectively applied to the vertical drainage channel of the vacuum preloading test section of the Beijing-Shanghai high-speed railway. The finite element method is used to simulate the site geology and construction conditions, and the consolidation process of the embankment is calculated. The calculation results of settlement and horizontal displacements at the foot of the slope are compared with the measured values. Analysis of the differences between the calculated and measured values of the three distribution patterns shows that the negative pressure distribution of the vertical drainage channel is assumed to be linearly distributed from top to bottom along the channel, that is, the linear reduction from the method of a particular value to Zero or a specific value of the method is not very realistic, will result in numerical analysis of the calculation results and the actual gap between the larger. It is suggested that the distribution of negative pressure in the vertical drainage channel is exponential curve distribution in silt, but the negative pressure distribution mode of vertical drainage channel in the depth of hard shell can be set in linear mode.