考虑井阻效应的水平排水板处理疏浚淤泥堆场大应变非线性固结

doi:10.3724/1000-6915.jrme.2024.0946

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摘要大量室内试验和工程应用已证实真空压力辅助水平排水板（prefabricated horizontal drains, PHDs）处理疏浚淤泥的优越性，但目前尚缺乏考虑井阻效应的PHDs处理疏浚淤泥固结理论研究。基于Gibson大应变固结理论，考虑PHDs的井阻效应，引入淤泥的非线性压缩和渗透特性，建立真空压力辅助PHDs处理疏浚淤泥堆场的大应变固结模型并获得其解答。通过与已有的理想PHDs处理淤泥的自重固结模型和室内试验开展对比分析，验证所建立固结模型的可靠性。在此基础上，分析井阻效应对淤泥固结性状的影响。结果表明：考虑井阻效应后，淤泥内超静孔压消散速度、固结速率和沉降变形会变慢，但减慢程度随着井阻效应的减弱而愈发不明显；井阻效应的强弱与PHDs的铺设长度、渗透系数、铺设率及堆填土的高度有关；优化PHDs的铺设方式可加快淤泥固结，在堆场中优先选择沿长度较短方向铺设PHDs，该铺设方法能有效降低井阻效应对固结的影响；PHDs铺设率?＜40%时可以通过增大铺设率以提高固结速率，超出此界限后需考虑铺设多层PHDs以提高固结效率。

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	刘长森
	李传勋

关键词 ：土力学, 真空压力, 水平排水板, 井阻效应, 非线性, 自重固结

Abstract：Numerous indoor tests and engineering applications have confirmed the superiority of prefabricated horizontal drains (PHDs) combined with vacuum preloading in the treatment of dredged sludge yards. However, existing consolidation theories for PHDs-treated dredged slurry currently do not account for the effects of well resistance. This study, based on Gibson′s large strain consolidation theory, incorporates the well resistance effect of PHDs and introduces the nonlinear compressibility and permeability of dredged sludge to establish a consolidation model for treating dredged sludge yards using PHDs in conjunction with vacuum preloading. Solutions for the proposed consolidation model are derived and validated through comparative analysis with existing self-weight consolidation models for ideal PHD configurations and laboratory test results. Furthermore, the influence of well resistance effects on consolidation behavior is systematically investigated. The results indicate that well resistance effects slow down the dissipation rate of excess pore water pressure, consolidation rate, and settlement deformation; however, this retardation progressively diminishes with decreasing well resistance. The magnitude of well resistance is influenced by the installation length of PHDs, the permeability coefficient, the laying ratio of PHDs, and the height of the sludge. Optimizing the layout of PHDs enhances the consolidation efficiency of dredged sludge. Prioritizing the alignment of PHDs along shorter repository dimensions effectively mitigates the impacts of well resistance on consolidation processes. When the laying ratio (?) remains below 40%, increasing ? improves consolidation rates through enhanced drainage capacity. Beyond this threshold, however, the implementation of multi-layer PHDs becomes essential to achieve further efficiency gains.

Key words： soil mechanics vacuum pressure prefabricated horizontal drains(PHDs) well resistance effect nonlinear self-weighted consolidation

引用本文:

刘长森，李传勋. 考虑井阻效应的水平排水板处理疏浚淤泥堆场大应变非线性固结[J]. 岩石力学与工程学报, 2025, 44(7): 1885-1896.
LIU Changsen, LI Chuanxun. Large-strain nonlinear consolidation of dredged sludge yards treated by prefabricated horizontal drains considering well resistance effect. , 2025, 44(7): 1885-1896.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2024.0946 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I7/1885

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