时间因子趋向零时孔隙压力计算中的振荡现象研究

Study on Surge Phenomenon During Pore Pressure Calculating for Time Factor Verge on Zero

固结过程中孔隙压力的计算结果对于固结度及固结系数的确定均有一定的影响。目前,孔隙压力的计算还仍然采用太沙基提出的级数计算公式,对该公式分析表明,当时间因子较小时,孔隙压力的计算中会出现病态的振荡现象,针对这种病态的振荡现象,采用傅立叶变换,对该计算公式进行变换,计算结果表明,对时间因子较小时,文中提出的计算公式可有效减少太沙基提出的级数计算公式中的这种病态振荡现象,计算结果良好。

The pore pressure calculating is important in the consolidation process. At present, the series formula is used to calculate the pore pressure. The analysis on the calculation formula indicated that there was a morbid bumped phenomenon during the calculation when T→0. In this paper, taking the σ-approximation, a new formula is given to fade away the bumped phenomenon. The calculated results show that using the formula given in this paper can effectively fade away the bumped phenomenon within proper exactitude.