Well resistance depends on discharge capacity of prefabricated vertical drains (PVDs), which affects the consolidation rate of soil at high water content importantly. Due to the lack of an axisymmetric large-strain consolidation model considering well resistance under vacuum pressure, the effect of well resistance on the degree of consolidation of ultra-soft soil is not clear. An axisymmetric large-strain consolidation model under vacuum pressure accounts for well resistance, self-weight stress, and vacuum attenuation along depth; both vertical and radial flow are proposed. Existing models established by Cao et al. and Nguyen et al. are special cases of the proposed model. The model and calculation method in this study are verified by the reported laboratory tests. The change laws of degree of consolidation defined by stress affected by key parameters of well resistance factor are discussed. It is found that the development of degree of consolidation will be delayed by the decreases of discharge capacity of PVDs and initial water content, as well as the increases of spacing ratio and time parameter of well resistance. The minimum demands of discharge capacity of PVDs with negligible well resistance increase exponentially with the increase of length of PVDs. The attenuation of vacuum pressure along the depth has greater influence on the degree of consolidation of soil than the attenuation of discharge capacity along the depth.

井阻力取决于预制垂直排水管 (PVD) 的排水能力，这对高含水量土壤的固结速度有重要影响。由于缺乏考虑真空压力下井阻力的轴对称大应变固结模型，井阻力对超软土固结程度的影响尚不清楚。真空压力下的轴对称大应变固结模型考虑了井阻力、自重应力和沿深度的真空衰减；建议垂直和径向流动。曹等人建立的现有模型。和 Nguyen 等人。是所提出模型的特例。本研究中的模型和计算方法得到了实验室报告的验证。讨论了受井阻力系数关键参数影响的应力定义的固结度变化规律。研究发现，PVD排量和初始含水量的降低，以及井阻的间距比和时间参数的增加，会延迟固结程度的发展。井阻可忽略不计的 PVD ​​对放电容量的最低要求随着 PVD ​​长度的增加呈指数增长。真空压力沿深度衰减对土体固结程度的影响大于排水能力沿深度衰减。研究发现，PVD排量和初始含水量的降低，以及井阻的间距比和时间参数的增加，会延迟固结程度的发展。井阻可忽略不计的 PVD ​​对放电容量的最低要求随着 PVD ​​长度的增加呈指数增长。真空压力沿深度衰减对土体固结程度的影响大于排水能力沿深度衰减。研究发现，PVD排量和初始含水量的降低，以及井阻的间距比和时间参数的增加，会延迟固结程度的发展。井阻可忽略不计的 PVD ​​对放电容量的最低要求随着 PVD ​​长度的增加呈指数增长。真空压力沿深度衰减对土体固结程度的影响大于排水能力沿深度衰减。