Abstract

Prefabricated vertical-horizontal drains (PVHDs) with high efficiency have been applied to accelerate the consolidation of dredger fill foundations. Considering the nonlinear characteristics of soil, the horizontal and vertical drainage paths and the penetration degree of horizontal drainage pipes, an improved consolidation calculation method for dredger fill foundations treated by PVHDs was developed. Sensitivity analysis was carried out on the parameters of the PVHDs system, and the effectiveness of the proposed method was verified by field tests. It is found that the parameters C_c/C_k, loading ratio (Δp/σ'), and penetration degree (ρ) jointly control the rate of the consolidation process. The average settlement consolidation degree (U_s) calculated by the proposed method agrees well with the field test values. By increasing ρ from 0.2 to 1.0, the consolidation time can be reduced by half when U_s reaches 90%.

摘要

高效的预制垂直水平排水沟（PVHD）已被应用于加速挖泥船填土基础的固结。考虑土体的非线性特性、水平排水路径和垂直排水路径以及水平排水管的穿透程度，提出了一种改进的PVHD处理挖泥船填土地基固结计算方法。对PVHDs系统参数进行了敏感性分析，并通过现场试验验证了所提方法的有效性。发现参数C _c / C _k、载荷比(Δ p / σ' )、侵彻度( ρ）共同控制固结过程的速率。该方法计算得到的平均沉降固结度（U _{s ）与现场试验值吻合较好。}通过将ρ从0.2增加到1.0，当U _s达到90%时，固结时间可以减少一半。