Vertical flow has an important effect on consolidation rate of ultra-soft soil, but the influence law and influence level on the degree of large-strain consolidation have not been quantitatively evaluated. Based on the negative axisymmetric large strain consolidation (NALSC) model, the variation laws of calculation error of consolidation degree ignoring vertical flow with consolidation time and strain are studied under different values of H/r_e (ratio of soil thickness to influence radius), w₀/w_L (ratio of initial water content to liquid limit) and k_h/k_v (ratio of horizontal permeability coefficient to vertical permeability coefficient). Taking 10% as the error threshold, the H/r_e values ignoring vertical flow are given, and the difference between them in the theories of large-strain and small-strain is discussed. The results show that the effect of vertical flow on degree of stress consolidation (U_p) is greater than degree of strain consolidation (U_s). The H/r_e values neglecting the effect of vertical flow on the degree of consolidation in large-strain theory are less than those in small-strain theory. The calculation errors affected by vertical flow decrease with the increase of H/r_e and k_h/k_v. Error of U_s affected by vertical flow decreases, whereas error of U_p increases with the increase of w₀/w_L. The effect of vertical flow on the degree of consolidation is greater when well resistance is considered.

垂向流对超软土固结率有重要影响，但对大应变固结程度的影响规律和影响程度尚未定量评价。基于负轴对称大应变固结（NALSC）模型，研究了在不同H/r _e（土厚影响半径比）值下，忽略垂向流的固结度计算误差随固结时间和应变的变化规律，w ₀ / w _L（初始含水量与液限之比）和k _h / k _v（水平渗透系数与垂直渗透系数之比）。以10%为误差阈值，给出了忽略垂向流的H/r _e值，并讨论了它们在大应变理论和小应变理论中的区别。结果表明，垂直流对应力固结度( U _p )的影响大于应变固结度( U _s )。大应变理论中忽略垂向流对固结程度影响的H/r _e值小于小应变理论。垂直流影响的计算误差随着H / r的增加而减小_e和k _h / k _v。U _{s 的}误差受垂直流影响减小，而U _{p 的}误差随着w ₀ / w _{L 的}增加而增加。考虑井阻力时垂向流对固结程度的影响更大。