The vacuum preloading method is widely applied in dredged sludge reinforcement, however, prefabricated vertical drain (PVD) clogging affects the effectiveness of ground reinforcement and leads to significant uneven settlement. To alleviate these deficiencies, this paper proposed an alternating prefabricated radiant drain vacuum preloading (APRD-VP) method considering the advantages of the alternating vacuum preloading (A-VP) method (delaying clogging) and prefabricated radiant drain vacuum preloading (PRD-VP) method (combining horizontal drainage and alleviating uneven settlement). The laboratory model experiments were conducted to explore the treatment effect of APRD-VP method, and the particle image velocimetry technology was employed to observe clogging range surrounding PVD. The experimental results demonstrate that APRD-VP method displayed a better reinforcement effect than the traditional method by analysis of water discharge, settlement, pore water pressure, water content, and vane shear strength. By investigating the clogging formation development for APRD-VP method, the maximum clogging range on both sides of the drainage board has been reduced by 3.15% and 14.02%. In addition, the empirical relationship between clogging range and settlement was established to can better judge and predict clogging range, which can lay the foundation for establishing the theory of computation of soft soil ground design suitable for APRD-VP method.

真空预压法广泛应用于疏浚污泥加固，但预制垂直排水沟（PVD）堵塞影响了地面加固的效果，并导致明显的不均匀沉降。为了缓解这些不足，本文综合考虑交替真空预压（A-VP）方法（延迟堵塞）和预制辐射排水真空预压（PRD-VP）的优点，提出了交替预制辐射排水真空预压（APRD-VP）方法方法（水平排水与缓解不均匀沉降相结合）。通过室内模型实验探讨APRD-VP法和粒子图像测速技术的治疗效果用于观察PVD周围的堵塞范围。实验结果通过排水量、沉降、孔隙水压力、含水量和叶片剪切强度分析表明，APRD-VP法比传统方法表现出更好的加固效果。通过研究APRD-VP法堵塞形成的发展情况，排水板两侧的最大堵塞范围分别减少了3.15%和14.02%。此外，建立堵塞范围与沉降的经验关系，可以更好地判断和预测堵塞范围，为建立适合APRD-VP法的软土地基设计计算理论奠定基础。