Geotextiles and Geomembranes最新文献_第6页

Centrifuge modelling of EPS geofoam behind integral bridge abutments 整体式桥台后EPS土工泡沫的离心建模

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-07-17 DOI: 10.1016/j.geotexmem.2025.07.005

Douglas G. Morley , Gopal SP. Madabhushi , Dennis Sakufiwa

This research investigates the extent to which geosynthetic compressible inclusions can be used to improve the performance of integral bridges. Geotechnical centrifuge modelling was used to simulate thermal movements acting on a 9 m abutment on a spread foundation, with and without a 1.2 m thick EPS geofoam inclusion. The compressible inclusion was found to significantly reduce the earth pressures behind the abutment generated over a 120-year design life of thermal cycles without undergoing notable permanent deformation. This resulted in the bridge deck axial force and peak abutment bending moment reaching only a third and two-thirds, respectively, of the values without the geofoam. Backfill settlement increased slightly when the compressible inclusion was used, although the peak settlement immediately behind the abutment face remained similar at around 100 mm. Through the application of extreme displacement amplitudes, it was found that the performance of EPS geofoam was not overly sensitive to permanent deformation, which was concentrated behind the top half of the abutment. By providing partial isolation, rather than accommodating thermal movements in their entirety, these results suggest that EPS geofoam can improve integral bridge performance even when subjected to large thermal movements.

本研究探讨了土工合成可压缩包体用于改善整体桥梁性能的程度。采用土工离心机模型，模拟了在有和没有1.2 m厚EPS土工泡沫包体的基础上，作用于9 m基台的热运动。在120年的热循环设计寿命中，可压缩包体显著降低了桥台背后产生的土压力，而不会发生明显的永久变形。这导致桥面轴力和峰值桥台弯矩分别仅达到未加土工泡沫时的三分之一和三分之二。当采用可压缩包裹体时，充填体沉降略有增加，但紧靠桥台后的峰值沉降保持在100 mm左右。通过极值位移幅值的应用，发现EPS土工泡沫塑料的性能对永久变形不太敏感，永久变形集中在桥台上半部分后。通过提供部分隔离，而不是完全容纳热运动，这些结果表明，即使在遭受大的热运动时，EPS土工泡沫也可以改善整体桥梁性能。

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引用次数: 0

Mitigating washboard effect: A study on geocells as soil reinforcement for unpaved roads 减轻搓板效应：土工格室作为非铺砌道路土加固的研究

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-07-16 DOI: 10.1016/j.geotexmem.2025.07.007

Laura Ibagón , Bernardo Caicedo , Juan P. Villacreses , Fernando López‐Caballero

Washboard or corrugation is characterised by undulating patterns that emerge on unpaved roads as vehicles pass over. Soil properties, vehicle velocity, and mass influence these undulations. This study investigates the use of a cellular confinement system (geocells) placed at the road surface as a method to increase soil shear resistance. This approach aims to mitigate the formation of washboard undulations. A multi-pass experimental setup was employed to evaluate the reinforcement effect on the washboard phenomenon. The setup consists of a rotating wheel that traverses a sandy path, both with and without geocell reinforcement. Reinforced and non-reinforced results were compared under various scenarios, including wheel velocities and masses. Additionally, the effect of geocell confinement was compared with the effect of apparent cohesion using the theoretical model proposed by Ibagón et al. (2025). Findings showed that ripple formations are significantly reduced due to the geocell reinforcement. This suggests that geocells placed at the road surface may improve the durability and stability of unpaved roads under repeated vehicular loads.

搓板或波纹的特点是起伏的图案，出现在未铺设的道路上，车辆通过。土壤性质、车辆速度和质量影响这些波动。本研究调查了放置在路面上的细胞约束系统（土工细胞）作为增加土壤抗剪性的方法的使用。这种方法旨在减轻搓板波动的形成。采用多道次实验装置，评价了强化对搓板现象的影响。这个装置由一个旋转的轮子组成，它穿过一条沙路，有或没有土工格室加固。在包括车轮速度和质量在内的各种情况下，对加筋和未加筋的结果进行了比较。此外，利用Ibagón等人（2025）提出的理论模型，将土工格室约束效应与表观黏聚效应进行了比较。结果表明，由于土工格室的加固，波纹的形成明显减少。这表明，放置在路面的土工细胞可以提高未铺设道路在反复车辆荷载下的耐久性和稳定性。

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引用次数: 0

Experimental study on reinforcement and remediation of nickel-contaminated sludge using grouting vacuum preloading combined with electroosmosis 注浆真空预压结合电渗透加固修复镍污染污泥的试验研究

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-07-13 DOI: 10.1016/j.geotexmem.2025.07.003

Peng Wang , Ming Li , Zhuoxuan Wu , Jun Wang , Guohui Yuan , Xianfeng Huang , Jianfeng Wu

Traditional vacuum preloading, electroosmotic techniques face challenges such as poor removal efficiency, reinforcement and high energy consumption when treating contaminated sludge with high water content. This study investigates the reinforcement and remediation of nickel (Ni)-contaminated sludge with high water content using an approach combining grouting, vacuum preloading, and electroosmosis (GVE). Through laboratory model tests, the effects of grouting agents, vacuum preloading, and voltage loading modes on Ni removal efficiency, soil reinforcement, and energy consumption were evaluated. The results demonstrate that the grouting of sodium alginate can chelate Ni²⁺ in the soil, facilitating the removal of heavy metal ions during the electroosmosis process. The GVE combined with vacuum preloading significantly enhances Ni removal rates, achieving up to 94.52 % compared to 65.11 % with electroosmosis alone. Additionally, GVE reduced soil water content to 30.34 % and increased shear strength to 98 kPa, indicating improved soil reinforcement. The step loading further reduced energy consumption by over 35 % compared to constant voltage loading while enhancing both soil remediation and reinforcement. This study concludes that GVE, particularly with step loading and intermittent loading, is an effective and energy-efficient method for remediating and reinforcing heavy metal contaminated sludge.

传统的真空预压、电渗透技术在处理高含水率的污染污泥时，面临去除率差、补强、能耗高等挑战。本研究采用灌浆、真空预压和电渗（GVE）相结合的方法对高含水率镍污染污泥进行加固和修复。通过室内模型试验，评价了注浆剂、真空预压和电压加载方式对Ni去除效率、土体加固和能耗的影响。结果表明，海藻酸钠灌浆能螯合土壤中的Ni2+，有利于电渗过程中重金属离子的去除。GVE联合真空预压显著提高了Ni的去除率，达到94.52%，而单独电渗透的去除率为65.11%。此外，GVE使土壤含水量降低到30.34%，抗剪强度提高到98 kPa，表明土壤加固效果有所改善。与恒压加载相比，阶梯加载进一步降低了35%以上的能耗，同时加强了土壤的修复和加固。本研究认为，GVE特别是分级加载和间歇加载是一种有效且节能的重金属污染污泥修复和加固方法。

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引用次数: 0

Investigation on dewatering and reinforcement of dredged clay treated with SAP and PVD under vacuum preloading 真空预压下SAP和PVD处理的挖泥脱水加固研究

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-07-12 DOI: 10.1016/j.geotexmem.2025.07.004

Yupeng Cao , Xinzhuang Cui , Zhehao Qiu , Jie Yin , Pengfei Qi , Shuo Sun

This study investigates the dewatering and reinforcement performance of high-water-content dredged slurry using vacuum preloading combined with superabsorbent polymer (SAP) as a flocculant. Preliminary sedimentation experiments were conducted to compare the dewatering performance of different flocculants, and SAP was identified as the most effective additive for enhancing sedimentation. Laboratory vacuum preloading model tests were conducted on dredged clay treated with SAP and prefabricated vertical drain (PVD), to evaluate the effectiveness of SAP in enhancing the dewatering process. Results show that SAP enhances vacuum efficiency, leading to higher and faster vacuum pressure stabilization near the PVD. SAP-treated samples exhibited more rapid pore water pressure dissipation and accelerated water content reduction, particularly in the early stages. Post-treatment water content increased with distance from the PVD, but SAP improved overall drainage uniformity. Vane shear strength decreased with distance from the PVD but remained higher in SAP-treated samples, showing a linear correlation with normalized water content. SAP also influenced soil column formation, expanding its effective radius and reducing stabilization time. Two quantitative models were developed to predict shear strength and soil column radius variations under vacuum preloading with and without SAP. The radius of the soil column formed during vacuum preloading varied with depth, decreasing towards the bottom and increasing towards the surface. These findings provide valuable insights for optimizing vacuum preloading in dredged material treatment and soft soil improvement.

研究了真空预压结合高吸水性聚合物（SAP）作为絮凝剂对高含水率疏浚浆的脱水增强性能。通过初步沉降试验，比较了不同絮凝剂的脱水性能，确定SAP是最有效的絮凝剂。通过实验室真空预压模型试验，对SAP和预制垂直排水管（PVD）处理的疏浚粘土进行了试验，以评价SAP对疏浚粘土脱水过程的改善效果。结果表明，SAP提高了真空效率，使得PVD附近的真空压力稳定速度更快。sap处理的样品表现出更快的孔隙水压力消散和加速的含水量降低，特别是在早期阶段。处理后的含水率随着与PVD距离的增加而增加，但SAP改善了整体排水均匀性。叶片抗剪强度随着与PVD的距离而降低，但在经过sap处理的样品中保持较高，与归一化含水量呈线性相关。SAP还影响了土柱的形成，扩大了有效半径，缩短了稳定时间。建立了两个定量模型来预测真空预压和不加SAP下土柱抗剪强度和半径的变化。真空预压形成的土柱半径随深度变化，向底部减小，向表面增大。这些研究结果为疏浚材料处理和软土改良中真空预压的优化提供了有价值的见解。

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引用次数: 0

Experimental study on the wicking performance of a wicking geotextile in coarse-grained soils under freezing-thawing actions 冻融作用下吸湿土工布在粗粒土中的吸湿性能试验研究

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-07-10 DOI: 10.1016/j.geotexmem.2025.06.009

Zhilang You , Jian Xu , Hua Liu , Zhichao Zhang , Yang Peng

The effectiveness of a self-developed wicking geotextile under different freezing-thawing cycles (0, 1, 3, 5, 10) in draining water from the coarse-grained railways soils with varying initial water contents (12 %, 15 %, 18 %, and 21 %) and fine contents (5 %, 10 %, 15 %, 20 %, 30 %) was evaluated using a series of vertical wicking tests. Results show that: 1) the wicking geotextile demonstrated efficient vertical water drainage from coarse-grained soils, with its performance significantly influenced by soil properties (initial water content and fine content) and freezing-thawing cycles; 2) the maximum liquid vertical wicking heights (LVWHs) of the wicking geotextiles in the coarse-grained soils increased with the increasing initial water contents but decreased with the increasing fine contents; 3) with the increase in freezing-thawing cycles, the maximum LVWHs of the wicking geotextiles in coarse-grained soils demonstrated a two-stage decline (first decreasing rapidly, then slowing down) before stabilizing at a constant value. Based on the microstructures, the mechanisms by which the initial water contents, fine contents, and freezing-thawing cycles affected the wicking performance were qualitatively analyzed and discussed. This study contributes to frost heave prevention of coarse-grained soils in cold regions.

在不同的冻融循环（0、1、3、5、10）条件下，对不同初始含水率（12%、15%、18%、21%）和不同细粒含水率（5%、10%、15%、20%、30%）的粗粒铁路土壤土进行了垂直吸湿试验，评价了自主研制的吸湿土壤布的排水效果。结果表明：1)吸湿土工布在粗粒土中具有良好的垂直排水性能，其性能受土壤性质（初始含水量和细粒含水量）和冻融循环的显著影响；2)在粗粒土中，吸水土工布的最大液体垂直吸水高度（LVWHs）随初始含水量的增加而增大，随细粒土含水量的增加而减小；3)随着冻融循环次数的增加，粗粒土中吸湿土工布的最大LVWHs呈现先快速下降后缓慢下降的两阶段下降趋势，最后稳定在一个恒定值。在微观结构的基础上，定性分析和讨论了初始含水量、细粒含量和冻融循环对吸湿性能的影响机理。该研究对寒地粗粒土的冻胀防治具有一定的指导意义。

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引用次数: 0

Experimental and numerical analysis of wrapped geogrid-stabilized high-fill embankment: Seismic response and composite reinforcement mechanisms 包裹土工格栅稳定高填方路堤的试验与数值分析：地震反应与复合加固机制

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-07-08 DOI: 10.1016/j.geotexmem.2025.06.008

Weiting Deng , Xuanming Ding , Chunyan Wang , Changwei Yang , Zhenhua Ren , Qiang Ou , Ren Wang

This study investigated the seismic response and reinforcement mechanism of high-fill embankment reinforced with geogrid and pile-slab structure through shaking table tests and numerical method. Experimental results demonstrated that the geogrid-reinforced composite embankment can still maintain structural integrity under high-intensity seismic loading (PGA ≥0.8g), exhibiting only surface cracking and localized soil extrusion. The acceleration amplification factor (AAF) exhibited both “elevation effect” and “surface tendency effect”, while strain distribution in the pile-slab structure followed characteristic arch-shaped and M-shaped patterns. Geogrid reinforcement effectively constrained soil deformation and redistributed stresses, delaying the development of pile bending moment and embankment displacement. Its reinforcement efficiency increased with seismic intensity. Validated numerical models reproduced shear strain localization-induced cracking at both embankment surfaces and embankment-accumulation interfaces. Shear strain propagation exhibited a progressive inward expansion from the embankment surface under seismic excitation. Parametric studies further revealed that reducing geogrid spacing can improve constraint effects, minimize displacement, and mitigate internal shear deformation. These findings underscore the synergistic role of geogrids and pile-slab structures in redistributing seismic thrust forces, offering critical insights for optimizing reinforcement strategies in seismically active regions.

通过振动台试验和数值计算方法，研究了土工格栅加桩-板结构高填方路堤的地震反应及加固机理。试验结果表明，在高烈度地震荷载（PGA≥0.8g）下，土工格栅加筋复合路堤仍能保持结构完整性，仅表现为表面开裂和局部土体挤压。加速度放大因子（AAF）同时表现出“高程效应”和“表面倾向效应”，而桩-板结构的应变分布则呈现出典型的拱形和m型特征。土工格栅加固有效地约束了土体变形和应力的重新分布，延缓了桩弯矩和路堤位移的发展。其配筋效率随地震烈度增大而增大。经过验证的数值模型再现了路堤表面和路堤-堆积界面剪切应变局部化引起的裂缝。在地震作用下，路堤表面的剪切应变向内扩展。参数化研究进一步表明，减小土工格栅间距可以改善约束效应，减少位移，减轻内部剪切变形。这些发现强调了土工格栅和桩板结构在重新分配地震推力方面的协同作用，为优化地震活跃地区的加固策略提供了重要见解。

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引用次数: 0

Experimental analysis of the influence of drainage board diameter coefficient on sludge treatment combining horizontal drain-vacuum preloading with geomembrane bags 排水板直径系数对水平排水-真空预压结合土工膜袋处理污泥影响的实验分析

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-07-08 DOI: 10.1016/j.geotexmem.2025.07.002

Jun Wang , Chenglong Gu , Xiaobing Li , Hongtao Fu , Junfeng Ni , Ziyang Gao , Long Wang

In the combined method of horizontal drainage board vacuum preloading and sealed geomembrane bags, the horizontal drainage board serves as the sole drainage channel, making its diameter coefficient critical in determining the appropriate filling height. Based on the theoretical model for vertical drainage boards, this study analyzes the influence range of a horizontal drainage board using the sealed geomembrane bag method. Model tests show that the maximum influence diameter coefficient of the horizontal drainage board lies between 24.6 and 25.3. By referencing the minimum influence diameter coefficient typically used for vertical drains, the applicable range for horizontal drainage boards in sealed geomembrane bags is suggested to be 15.0 to 25.3. Results also reveal that the upper slurry layer drains more efficiently than the lower layer due to gravity-assisted downward flow. In contrast, upward drainage in the lower zone is less effective. Adding a drainage board at the bottom creates a direct flow path and improves consolidation in the lower zone. To mitigate clogging during testing, the drainage board was embedded in geotextile, which reduced clogging to some extent. However, as clogging is difficult to avoid in practice, the proposed coefficient does not account for its effects.

在水平排水板真空预压与密封土工膜袋组合方法中，水平排水板作为唯一的排水通道，其直径系数对确定合适的填充高度至关重要。基于垂直排水板的理论模型，分析了密封土工膜袋法对水平排水板的影响范围。模型试验表明，水平排水板的最大影响直径系数在24.6 ~ 25.3之间。参考垂直排水管通常使用的最小影响直径系数，建议密封土工膜袋装水平排水板的适用范围为15.0 ~ 25.3。结果还表明，由于重力辅助下向流动，上层浆体比下层浆体排水效率更高。相反，下部区域向上排水效果较差。在底部添加排水板可以创造直接的流动路径，并改善下部区域的固结。为了减少测试过程中的堵塞，将排水板嵌入土工布中，在一定程度上减少了堵塞。然而，由于堵塞在实践中是难以避免的，所提出的系数并没有考虑其影响。

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引用次数: 0

Filtration characteristics and mechanism of geotextile filters under cyclic flow 土工布过滤器在循环流作用下的过滤特性及机理

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-07-07 DOI: 10.1016/j.geotexmem.2025.07.001

Feifan Ren , Zhipeng Hu , Yuan Gao , Qiangqiang Huang , Xiaorui Qian

Geotextile filter layers are extensively utilized in revetment structures for riverbanks, floodwalls, and dams. These structures are often located in complex hydraulic environments, so geotextile filter layers may be subject to long-term cyclic flows. In this study, based on a self-developed gradient ratio test device, a series of gradient ratio tests under different hydraulic gradients and normal stresses were carried out to investigate the filtration characteristics and mechanisms of soil-geotextile systems under cyclic flow. The results show that the risk of particle erosion under cyclic flow is greater than the risk of system clogging, and the magnitude of hydraulic gradient and normal stress have an important influence on the filtration behavior. The boundary scour effect caused by the cyclic flow is proportional to the hydraulic gradient, while the normal stress enhances the retention of the soil through the benign geotextile blockage effect. The corresponding visual inspection analyses reveal that stable arching structures can be formed near the filter interface under cyclic flow, thus mechanically enhancing the stability of the system. These mechanisms suggest that strategic adjustments of the overburden pressure can optimize the structural stability of the soil-geotextile system in flood-prone environments.

土工布过滤层广泛应用于河岸、防洪墙和水坝的护岸结构中。这些结构通常位于复杂的水力环境中，因此土工布过滤层可能会受到长期循环流动的影响。本研究基于自行研制的梯度比试验装置，进行了一系列不同水力梯度和法向应力下的梯度比试验，研究循环流作用下土工织物-土工织物体系的过滤特性及机理。结果表明：循环渗流作用下颗粒侵蚀风险大于系统堵塞风险，水力梯度大小和法向应力对过滤行为有重要影响。循环流动引起的边界冲刷效应与水力梯度成正比，而正应力通过良性土工布堵塞作用增强土体的截留力。目测分析表明，在循环流动作用下，滤料界面附近可形成稳定的拱状结构，从而提高了系统的机械稳定性。这些机制表明，在洪水易发环境下，策略性地调整覆盖层压力可以优化土-土工织物系统的结构稳定性。

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引用次数: 0

The effect of physical-chemical combined clogging on the area density and permeability of geotextile envelopes for subsurface drainage systems in arid regions 干旱区地下排水系统中物化复合堵塞对土工布围护层面积密度和渗透性的影响

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-07-03 DOI: 10.1016/j.geotexmem.2025.06.006

Shuai Qin , Chenyao Guo , Jingwei Wu , Shuai He , Haoyu Yang , Chenzhi Yao , Xinman Jiang , Hang Li

This study investigates the morphological characteristics, development process, and impact on permeability of physical-chemical combined clogging on geotextile envelopes, through laboratory experiments involving particle flow coupled with chemical precipitation. The results show that there is a synergistic effect between physical clogging caused by soil particle accumulation and chemical clogging due to salt precipitation. Chemical precipitation exacerbates physical clogging, while physical clogging promotes the formation of chemical precipitation. The chemical precipitates on the upstream of the geotextile envelope binds the particles to each other and to the fibers of the geotextile envelope, while on the downstream, precipitates tends to encapsulate the fibers, with less physical clogging. After combined clogging, the permeability coefficient of the geotextile envelope decreases rapidly with the increasing of the clogging material, and then decreases slowly. When the area density of the clogging material is less than 91.02 g/m², it shows a linear decrease, and then followed by a logarithmic decrease. Physical-chemical combined clogging is more severe than single physical or chemical clogging. After the permeability stabilizes, for the same clogging mass, the decrease in permeability caused by combined clogging is 1.2 times and 2 times greater than that caused by physical and chemical clogging, respectively.

本研究通过颗粒流耦合化学沉淀的室内实验，研究了土工布围护结构物理-化学复合堵塞的形态特征、发展过程及其对渗透性的影响。结果表明，土壤颗粒堆积引起的物理堵塞与盐降水引起的化学堵塞之间存在协同效应。化学沉淀加剧了物理堵塞，而物理堵塞促进了化学沉淀的形成。在土工布围护结构的上游，化学沉淀物使颗粒相互结合，并与纤维结合，而在下游，沉淀物倾向于包裹纤维，物理堵塞较少。复合堵塞后，随着堵塞材料的增加，土工布围护结构的渗透系数迅速下降，然后缓慢下降。当堵料的面积密度小于91.02 g/m2时，堵料面积密度先呈线性减小，然后呈对数减小。物理-化学复合堵塞比单一的物理或化学堵塞更为严重。在渗透率稳定后，对于相同堵塞质量，复合堵塞对渗透率的影响分别是物理堵塞和化学堵塞的1.2倍和2倍。

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引用次数: 0

Analytical solution of freeze-thaw pretreatment combined with step vacuum preloading for sludge consolidation and dewatering 冻融预处理结合阶梯真空预压污泥固结脱水的解析解

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes

Pub Date : 2025-06-30 DOI: 10.1016/j.geotexmem.2025.06.005

Xudong Zhang , Zhenggao Xu , Yajun Wu , Peng Ye , Xueke Zang , Jinhong Wu

A significant amount of sludge is generated worldwide every day, characterized by its high moisture content. This study investigates the impact of freeze-thaw cycles and step vacuum preloading on sludge dewatering and volume reduction. It also analyzes the effects of different loading methods to address challenges associated with sludge dewatering. Based on Hansbo's consolidation theory, equations for excess pore water pressure and the degree of consolidation under step vacuum loading are derived, and the experimental results are predicted. A conversion coefficient, r, was introduced to measure the degree of clogging in the drainage board. The results indicate that step vacuum loading is more effective for sludge drainage and volume reduction. Additionally, the theoretical predictions accurately reflect the experimental outcomes, providing a solid theoretical foundation for the feasibility of employing step vacuum preloading in engineering applications.

每天在世界范围内产生大量的污泥，其特点是其高水分含量。研究了冻融循环和阶梯真空预压对污泥脱水和减容的影响。它还分析了不同加载方法的影响，以解决与污泥脱水相关的挑战。基于Hansbo固结理论，推导了阶梯真空加载下的超孔隙水压力和固结度方程，并对试验结果进行了预测。引入转换系数r来衡量排水板的堵塞程度。结果表明，分级真空加载对污泥的排泥和减容效果更好。理论预测准确地反映了实验结果，为在工程应用中采用阶梯真空预压的可行性提供了坚实的理论基础。

引用次数: 0