Cold Regions Science and Technology最新文献_第9页

Distribution characteristics of secondary embankment diseases in permafrost regions of Qinghai Province and their relationship with local factors 青海省多年冻土区次生路堤病害分布特征及其与局地因子的关系

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-11-10 DOI: 10.1016/j.coldregions.2025.104751

Peng Zhang , Lei Liu , Yangyang Xie , Xuyang Wu , Xingwen Fan , Wenjiao Li , Nuocheng Li , Xuhui Wang , Fujun Niu , Zhanju Lin

Climate warming-induced permafrost degradation significantly impacts the safe operation of road infrastructure, leading to the increased prevalence of embankment diseases (ED). To compare the differences in ED under different permafrost distributions and local factors, this study examines two important highways located in different regions: the Qinghai-Tibet Highway (QTH) and the Gonghe-Yushu Expressway (GYE). Statistical analysis and machine learning techniques were used to assess the types and characteristics of ED and to investigate their relationship with local factors. The analysis also explores how permafrost degradation, crack propagation, and moisture infiltration contribute to ED development. Furthermore, the study explores the causes of significant variations in ED across different highways (ordinary national road and expressway). Results indicate that ED in Qinghai Province are primarily characterized by cracks. In the southern GYE region, block, transverse, longitudinal, and alligator cracking make up 93.13 % of total ED, while 73.36 % of ED in the western QTH region are crack-related. The overall occurrence rate of ED on the QTH is much higher than that on the GYE. ED are strongly correlated with factors such as volumetric ice content (VIC), aspect, mean annual ground temperature (MAGT), and mean annual precipitation (MAP) (p ≤ 0.0001, r > 0). MAGT, VIC, and MAP significantly influence cumulative disease areas, pavement damage rates, and the International Roughness Index. These findings provide important insights into the challenges faced by road infrastructure in permafrost regions of Qinghai Province, offering guidance for future construction and maintenance strategies.

气候变暖引起的冻土退化严重影响道路基础设施的安全运行，导致路堤病害（ED）的患病率增加。采用统计分析和机器学习技术评估ED的类型和特征，并调查其与当地因素的关系。分析还探讨了冻土退化、裂缝扩展和水分渗透对ED发展的影响。此外，该研究还探讨了不同高速公路（普通国道和高速公路）ED显著差异的原因。结果表明，青海省ED以裂缝为主。在GYE南部地区，块状裂缝、横向裂缝、纵向裂缝和鳄鱼状裂缝占总裂缝的93.13%，而在QTH西部地区，与裂缝有关的裂缝占总裂缝的73.36%。QTH的ED总体发生率远高于GYE。ED与体积冰含量（VIC）、坡向、年平均地温（MAGT）、年平均降水量（MAP）等因子呈显著正相关（p≤0.0001,r > 0）。MAGT、VIC和MAP显著影响累积病害面积、路面损失率和国际粗糙度指数。这些发现为了解青海省多年冻土区道路基础设施面临的挑战提供了重要见解，为未来的建设和维护策略提供了指导。

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引用次数: 0

Anti-icing performance of electric heating for wind turbine blades based on the positive temperature coefficient material 基于正温度系数材料的风电叶片电加热防冰性能研究

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-11-09 DOI: 10.1016/j.coldregions.2025.104749

Maozheng Wang , Yang Zhao , Yu Lin , Xingliang Jiang , Yijun Yuan

Blade icing poses a significant challenge to the safe and stable operation of wind turbines. However, the widely used electric heating anti-icing technology for wind turbine blades still faces several issues, including heating unevenly in the target area, localized ice formation, and system overcomplexity form excessive partitioning. This study proposes an innovative approach utilizing positive temperature coefficient (PTC) materials with a Curie temperature point of 1 °C to achieve adaptive electric heating for blades. Then, based on the material's resistance-temperature characteristics, an electric heating model for blades is established and numerically simulated. The results demonstrate that employing the PTC material for electric heating of blades achieves more uniform heating across the target area, eliminating the need for partitioning. With increasing operating voltage, the composite material exhibits strong adaptive capability, effectively limiting the maximum temperature within the target area to below 3 °C. Furthermore, under a fixed operating voltage, the composite material adaptively adjusts its heating power in response to varying ambient temperatures and wind speeds. Remarkably, the material maintains robust adaptive adjustment capability even after 100 resistance-temperature test cycles. Finally, the adaptive adjustment capability of this material is verified through field experiments. This research provides valuable theoretical and experimental foundations for future investigations on wind turbine blade anti-icing system utilizing the PTC material.

叶片结冰对风力发电机的安全稳定运行提出了重大挑战。然而，目前广泛应用的风电叶片电加热防冰技术仍然面临着目标区域受热不均匀、局部结冰、系统过于复杂形成过度分区等问题。本研究提出了一种利用居里温度点为1°C的正温度系数（PTC）材料实现叶片自适应电加热的创新方法。然后，根据材料的电阻-温度特性，建立了叶片电加热模型并进行了数值模拟。结果表明，采用PTC材料对叶片进行电加热，可以在整个目标区域实现更均匀的加热，无需分区。随着工作电压的增加，复合材料表现出较强的自适应能力，有效地将目标区域内的最高温度限制在3℃以下。此外，在固定的工作电压下，复合材料可以根据不同的环境温度和风速自适应地调节其加热功率。值得注意的是，即使经过100次电阻-温度测试循环，该材料仍保持强大的自适应调节能力。最后，通过现场实验验证了该材料的自适应调节能力。该研究为今后利用PTC材料进行风力机叶片防冰系统的研究提供了有价值的理论和实验基础。

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引用次数: 0

Thermal regime of novel spliced subgrade in permafrost regions 多年冻土区新型拼接路基热状态研究

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-11-07 DOI: 10.1016/j.coldregions.2025.104743

Xin Yi , Guo Ming , Wenbing Yu , Fenglei Han , Haicui Wang , Guo Li

Building a spliced subgrade on the basis of the existing old subgrade is a common technique for increasing the subgrade width., but it faces challenges related to thermal stability control. This study proposes a novel spliced ventilation structure. A 3D conductive–convective model was developed to simulate heat transfer in the embankment, and airflow in the ventilation duct is modeled using the k–ε turbulence equations. The south-north slope effect, the use of wind dampers, and the closure of ventilation pipes during cold or warm seasons were considered. The thermal regime of both the common subgrade and the splicing ventilation embankment was simulated to evaluate their heat transfer characteristics. The simulation results indicate that the splicing position and the damper opening state of the wind door are closely related to the thermal regime characteristics of the embankment. The splicing ventilation embankment exerts a cooling effect on any side of the old subgrade. However, when the new ventilation splicing subgrade is joined on the northern side of the old subgrade, the cooling effect of the ventilating pipe is superior to that of splicing on the southern slope. In the absence of a wind damper in the ventiduct, when the ventilating embankment is spliced on the northern side of the old subgrade, the permafrost table beneath the spliced subgrade can be raised to −2.4 m; when the ventilation embankment is spliced onto the southern side of the old subgrade, the permafrost table beneath the spliced subgrade can only be raised to 3.5 m, which is 1.1 m lower than the former condition. Additionally, when splicing on the northern side of the old subgrade, the installation of the wind damper does not affect the cooling effect. However, when splicing occurs on the southern side of the old subgrade slope, the cooling effect with a wind door is much better than that without a wind door. The results can serve as a reference for the design of spliced wide roadbeds in permafrost regions.

在原有旧路基基础上修建拼接路基是增加路基宽度的常用技术。但它面临着与热稳定性控制相关的挑战。本研究提出了一种新型的拼接式通风结构。建立了三维导对流模型来模拟路基内的传热，并利用k -ε湍流方程对通风管道内的气流进行了建模。考虑了南北坡效应、风阻器的使用以及冷暖季节通风管道的关闭。模拟了普通路基和拼接式通风路堤的热态，评价了两者的传热特性。仿真结果表明，风门的拼接位置和阻尼器开启状态与路堤的热态特性密切相关。拼接式通风路堤对旧路基的任何一侧都有降温作用。然而，当新通风拼接路基连接在旧路基的北侧时，通风管道的冷却效果优于南坡拼接。在通风管道中不设置风门的情况下，在旧路基北侧拼接通风路堤时，可将拼接后的路基下多年冻土层抬升至−2.4 m；在旧路基南侧拼接通风路堤时，拼接后的路基下多年冻土水位只能升高到3.5 m，比原有条件降低了1.1 m。另外，在旧路基北侧拼接时，安装风门不影响降温效果。但是，当旧路基边坡南侧发生拼接时，有风门的降温效果要比没有风门的好得多。研究结果可为多年冻土区拼接宽路基的设计提供参考。

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引用次数: 0

Research on the resistance characteristics and model construction of aircraft tires on snow-covered runways 飞机轮胎在积雪跑道上的阻力特性及模型构建研究

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-11-07 DOI: 10.1016/j.coldregions.2025.104747

Qingmiao Ding , Haibin Jiang , Boyuan Ping , Yanyu Cui , Hao Zhang , Juquan Yang

Snow accumulation on airport runways alters the braking performance of aircraft, affecting the safety of takeoffs and landings. This study employs the coupled Euler-Lagrange (CEL) method to numerically simulate the interaction between snow and aircraft tires. The analysis focuses on the examination of snow thickness, wheel speed, tire load and other factors, with the objective of deriving a rolling resistance model for aircraft tires on snow-covered runways. The research findings indicate: 1) Snow depth on the runway and aircraft wheel speed significantly affect the resistance between the tire and snow; 2) The resistance between the tire and snow increases with wheel speed, and this trend becomes more pronounced as speed increases. The resistance also increases with tire load, as the snow is not fully compacted, leading to a rapid initial increase in rolling resistance. Once the load reaches the threshold for complete snow compaction, the resistance increases stabilizes. 3) A new resistance calculation model based on the EASA AMC 25.1591 solid contaminant resistance theory is proposed. Compared to experimental results, the model achieves an average relative error of 9.1 % and a maximum relative error of 16.3 %, improving the prediction accuracy of tire-snow resistance by nearly 30 %.

机场跑道上的积雪会改变飞机的制动性能，影响起飞和降落的安全。本文采用耦合欧拉-拉格朗日（CEL）方法对雪与飞机轮胎的相互作用进行了数值模拟。分析重点考察了积雪厚度、车轮速度、轮胎载荷等因素，目的是推导飞机轮胎在积雪跑道上的滚动阻力模型。研究结果表明：1)跑道雪深和飞机轮速对轮胎与雪间阻力有显著影响；2)轮胎与雪地之间的阻力随着车轮速度的增加而增加，并且随着速度的增加，这种趋势更加明显。阻力也随着轮胎负荷的增加而增加，因为雪没有完全压实，导致初始滚动阻力迅速增加。一旦载荷达到完全压实雪的阈值，阻力增加趋于稳定。3)基于EASA AMC 25.1591固体污染物阻力理论，提出了一种新的阻力计算模型。与实验结果相比，该模型的平均相对误差为9.1%，最大相对误差为16.3%，使轮胎雪阻力的预测精度提高了近30%。

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引用次数: 0

Research on the mechanical properties and fracture morphology of cold-frozen red sandstone at different strain rates 不同应变速率下冷冻红砂岩力学性能及断裂形态研究

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-11-06 DOI: 10.1016/j.coldregions.2025.104746

Hao Wang , Nao Lv , Qi Zong , Haibo Wang

To further explore the effects of water saturation, loading rate and low temperature on the mechanical properties of red sandstone at engineering sites, uniaxial compression tests were carried out on low-temperature treated rocks at different strain rates via an electrohydraulic servo press and SHPB test device. The effects of water saturation, low temperature and strain rate on the compressive properties, energy dissipation and fracture morphology of in situ red sandstone are analyzed. The results are as follows: 1) The static and dynamic compressive strengths of dry red sandstone samples increase with decreasing temperature, and the compressive strength of saturated red sandstone samples peaks at −15 °C. 2) With increasing temperature, the dissipative energy of dry red sandstone samples increases continuously under static and dynamic loads, and the dissipative energy of saturated red sandstone samples first slightly increases but then continuously decreases. With increasing strain rate, the energy dissipation of the sample first increases but then decreases, and the energy dissipation rate of the sample is the highest under an impact pressure of 0.4 MPa. 3) The influence of temperature on the peak strength of dry and water-saturated red sandstone samples is greater than that of strain rate, the influence on the dissipated energy of dry red sandstone samples is greater than that of strain rate, and the influence on the dissipated energy of water-saturated red sandstone samples is lower than that of strain rate. 4) Under static loading, the low-temperature frozen red sandstone samples exhibit both shear failure modes and tensile failure modes. Under impact loading, the dry samples all experienced compost failure, whereas the water-saturated samples experienced splitting tensile failure and axial compression failure. Low-temperature freezing reduces the degree of breakage of the sample. The influence of the low-temperature environment on the site rock mass should be fully considered, and the blasting construction scheme should be adjusted to ensure the construction effect.

为进一步探讨含水饱和度、加载速率和低温对工程现场红砂岩力学性能的影响，利用电液伺服压力机和SHPB试验装置对低温处理过的岩石在不同应变速率下进行了单轴压缩试验。分析了含水饱和度、低温和应变速率对原地红砂岩压缩性能、能量耗散和裂缝形态的影响。结果表明：1)干燥红砂岩的静、动抗压强度随温度的降低而增大，饱和红砂岩的抗压强度在- 15℃时达到峰值。2)随着温度的升高，干红砂岩在静、动荷载作用下的耗散能不断增大，饱和红砂岩的耗散能先略有增大后持续减小。随着应变速率的增大，试样的能量耗散先增大后减小，冲击压力为0.4 MPa时，试样的能量耗散率最高。3)温度对干燥和水饱和红砂岩试样峰值强度的影响大于应变速率的影响，对干燥红砂岩试样耗散能的影响大于应变速率的影响，对水饱和红砂岩试样耗散能的影响小于应变速率的影响。4)在静荷载作用下，低温冻结红砂岩试样呈现剪切破坏模式和拉伸破坏模式。在冲击荷载作用下，干燥试样均经历堆肥破坏，而水饱和试样经历劈裂拉伸破坏和轴压破坏。低温冷冻降低了试样的破碎程度。应充分考虑低温环境对现场岩体的影响，调整爆破施工方案，保证施工效果。

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引用次数: 0

Coupling effects of temperature and water content on the dynamic properties of frozen red sandstone 温度和含水量对冻结红砂岩动力特性的耦合影响

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-11-06 DOI: 10.1016/j.coldregions.2025.104745

Jianhua Yang , Xianming Chen , Zhiwei Ye , Chi Yao , Xiaobo Zhang , Yongli Ma , Da Liu

In cold regions, the dynamic properties of frozen rock are a key consideration for blasting engineering in rock masses. However, the coupling effects of temperature and water content on them remain poorly understood in current research. In this study, dynamic impact tests were performed on red sandstone specimens with saturated water coefficients ranging from 0.2 to 1.0 under ambient and negative temperatures, based on the improved split Hopkinson pressure bar system, by integrating a real-time sub-zero temperature control module. The temperature influence factor (TIF) has been creatively defined, establishing the relationship between the dynamic parameters of ambient-temperature rocks and cryogenic rocks, thus filling the gap where no connection existed between them. The results demonstrate that, under a fixed moisture content, both the dynamic uniaxial compressive strength (σ_cd) and the dynamic elastic modulus (E_d) increase with decreasing temperature. Due to the influence of the saturation coefficient on the content of ice formed by phase change of water in rock pore (weakening effect of unfrozen water at low saturation coefficients→strengthening effect of ice at moderate saturation coefficients→deterioration effect of excessive ice at high saturation coefficients), both σ_cd and E_d of frozen red sandstone follow a three-stage evolution pattern of first decreasing, then increasing, and finally decreasing with increasing saturation coefficients. The TIF of σ_cd and E_d has a positive correlation trend with the saturation coefficient. Under the tested sub-zero conditions, TIF increases approximately linearly with decreasing temperature. Additionally, the specimen's aspect ratio, strain rate, and static compressive strength all significantly affect the rate of change in TIF with temperature.

在寒冷地区，冻结岩体的动力特性是岩体爆破工程的关键考虑因素。然而，目前的研究对温度和含水量对它们的耦合效应知之甚少。本研究基于改进的分离式霍普金森压杆系统，通过集成实时零度以下温度控制模块，对饱和水系数为0.2 ~ 1.0的红砂岩试件在环境温度和负温度下进行了动态冲击试验。创造性地定义了温度影响因子（TIF），建立了常温岩石与低温岩石动态参数之间的关系，填补了两者之间没有联系的空白。结果表明：在一定含水率下，随着温度的降低，动态单轴抗压强度（σcd）和动态弹性模量（Ed）均增大；由于饱和系数对岩石孔隙中水相变冰含量的影响（低饱和系数下未冻水的弱化作用→中等饱和系数下冰的强化作用→高饱和系数下过量冰的劣化作用），冻结红砂岩的σcd和Ed均呈现先减小后增大的三阶段演化规律；最后随着饱和系数的增大而减小。σcd和Ed的TIF与饱和系数呈正相关趋势。在测试的零下条件下，TIF随温度的降低近似线性增加。此外，试样的长径比、应变率和静态抗压强度都显著影响TIF随温度的变化率。

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引用次数: 0

Ice loads in ship-ice glancing impacts: Experimental investigation and validation of energy-based predictions 船冰掠射撞击中的冰载荷：基于能量预测的实验研究和验证

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-11-06 DOI: 10.1016/j.coldregions.2025.104744

Zongyu Jiang , Pentti Kujala , Spyros Hirdaris , Pauli Lehto , Henrik Toikka , Mikko Suominen

Arctic shipping has grown significantly in recent years, driven by diminishing sea ice and the pursuit of shorter shipping routes. However, the harsh Arctic environment poses risks to ships, particularly from ship-ice collisions, which can damage hulls and threaten safety. Accurate prediction of ice loads during such interactions is crucial for designing ice-going vessels. This study investigates ice loads induced by glancing impacts between a ship and a free-floating ice floe through a series of model-scale experiments conducted in calm water. A novel model ice material with stable compressive strength at room temperature was developed to ensure consistent test conditions. The experiments measured ice loads, ice indentation, and the motions of both the ship and ice models during impact. The results were compared with predictions from the energy-based Popov method, which evaluates ice loads using momentum and energy conservation principles. The study found that the Popov method provides reasonable predictions of ice loads, particularly in capturing the influence of ship speed, but tends to underestimate the measured loads. The contact location between the ship and ice floe has a significant influence on the magnitude of ice loads, with impacts near the bow shoulder generating higher forces compared to those closer to the stem. While the Popov method can qualitatively reflect the influence of contact location on ice loads, it significantly underestimates the strength of this effect. Visual observations suggest that the variation could be attributed to the ship-ice hydrodynamic interaction, which may not be captured by the Popov method. The findings highlight the importance of considering contact location and hydrodynamic effects in ice load predictions. In contrast, the Popov method overestimates ice indentation by assuming that all kinetic energy loss is absorbed by the ice failure, disregarding other energy dissipation mechanisms. This research contributes to the validation and refinement of theoretical models for ship-ice interactions, offering insights into the design of ice-going vessels operating in Arctic conditions.

近年来，在海冰减少和人们追求更短航线的推动下，北极航运显著增长。然而，恶劣的北极环境给船舶带来了风险，特别是船冰碰撞，这可能会损坏船体并威胁安全。在这种相互作用中准确预测冰荷载对于设计冰船至关重要。本研究通过在静水中进行的一系列模型比例尺实验，研究了船舶与自由浮冰之间的掠射碰撞所引起的冰荷载。为了保证试验条件的一致性，研制了一种室温下抗压强度稳定的新型冰材料模型。实验测量了冰的载荷、冰的压痕以及船和冰模型在撞击过程中的运动。结果与基于能量的波波夫方法的预测结果进行了比较，波波夫方法利用动量和能量守恒原理评估冰载荷。研究发现，波波夫方法提供了合理的冰负荷预测，特别是在捕捉船舶速度的影响时，但往往低估了测量的负荷。船舶与浮冰之间的接触位置对冰荷载的大小有显著影响，靠近船首肩的撞击产生的力比靠近船首杆的撞击产生的力大。虽然波波夫方法可以定性地反映接触位置对冰荷载的影响，但它明显低估了这种影响的强度。目视观察表明，这种变化可能归因于船-冰流体动力相互作用，这可能无法被波波夫方法捕获。研究结果强调了在冰荷载预测中考虑接触位置和水动力效应的重要性。相比之下，波波夫方法高估了冰压痕，因为它假设所有动能损失都被冰破坏吸收了，而忽略了其他能量耗散机制。这项研究有助于验证和完善船冰相互作用的理论模型，为在北极条件下运行的冰船的设计提供见解。

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引用次数: 0

Seasonal evolution of brackish ice microstructure during growth and decay processes 微咸冰生长和衰减过程中微观结构的季节性演变

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-11-03 DOI: 10.1016/j.coldregions.2025.104740

Miao Yu , Peng Lu , Hang Zhang , Guiyong Zhang , Lei Wang , Qingkai Wang , Zhijun Li

The physical properties of ice are primarily determined by its microstructure, such as gas bubbles and brine pockets within ice. However, the distributions and evolution patterns of these inclusions during ice freezing and melting remain poorly understood. Most studies therefore treat the ice microstructure as constant and ignore its seasonal variations. To investigate this issue, in situ experiments were conducted on a brackish lake to collect detailed information on the variations in the microstructure of ice using continuous sampling and a high-resolution imaging system. During the freezing phase, the volume fractions of gas bubbles and brine pockets remained relatively stable and decreased, respectively. Furthermore, the size of gas bubbles and brine pockets in the ice surface, middle, and bottom layers of ice increased clearly during the melting phase of ice due to different reasons. The nearly 30 % increase in gas bubbles observed in the middle layer was driven by ice temperature, while the increase in the surface layer was influenced by the net shortwave radiation. Additionally, the variation in the size distribution of inclusions was attributed to the merging process, which primarily occurred among smaller inclusions rather than among larger inclusions. The number of both gas and brine inclusions in the middle layer was found to decrease by 10 to 20 % for an increase in ice temperature by 1 °C, while this phenomenon was not observed in the surface or bottom layers. This study could improve our understanding of how ice microstructure changes.

冰的物理性质主要取决于其微观结构，如冰内的气泡和盐水袋。然而，这些包裹体在冰冻结和融化过程中的分布和演化模式仍然知之甚少。因此，大多数研究将冰的微观结构视为常数，而忽略了它的季节变化。为了研究这一问题，我们在一个微咸湖泊上进行了原位实验，利用连续采样和高分辨率成像系统收集了冰微观结构变化的详细信息。在冻结阶段，气泡和盐水袋的体积分数分别保持相对稳定和减小。在冰融化阶段，由于不同的原因，冰表面、中间和底部的气泡和盐水袋的大小明显增加。中层气泡增加近30%主要受冰温驱动，而表层气泡增加主要受净短波辐射影响。此外，包裹体尺寸分布的变化主要归因于合并过程，合并过程主要发生在较小的包裹体中，而不是在较大的包裹体中。研究发现，冰温每升高1°C，中间层中气体和盐水包裹体的数量减少10% ~ 20%，而在表层和底层均未观察到这种现象。这项研究可以提高我们对冰微观结构变化的理解。

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引用次数: 0

Closed-form solution method for mechanical response of isolated-span transmission line after ice shedding based on state discretization 基于状态离散化的隔跨输电线路脱冰后力学响应的闭式求解方法

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-11-03 DOI: 10.1016/j.coldregions.2025.104738

Zhao Yan , Si-yuan Wu , Xing Fu , Hong-nan Li , Hao Li , Zeng-hao Huang

Vibrations induced by ice-shedding in transmission lines can trigger flashover and conductor breakage, driving an urgent requirement for efficient response prediction methods. Existing theoretical approaches predominantly calculate maximum jump heights for conductors supported by tangent towers. However, the behavior of ground wires and conductors supported by angle and strain towers is similar to isolated spans, so their different response characteristics render traditional assumptions inapplicable, which leads to great computational deviations. To address this gap, the concept of effective weight is introduced, and two potential characteristics of dynamic tension variation are investigated in this study. A closed-form theoretical solution for the critical responses of transmission lines is developed based on state discretization. To validate its accuracy, comparative analyses are conducted using experimental data and finite element simulation results. Furthermore, the influence of various parameters on the ice-shedding response was systematically discussed. The results demonstrate that, compared to existing methods, the proposed method can provide more accurate predictions of maximum jump height and enables effective estimation of displacement and stress for isolated-span conductors and ground wires. Therefore, this method can significantly reduce analysis time and provide valuable evaluations for the structural design and deicing operations in practical engineering.

输电线路中冰脱落引起的振动会引发闪络和导线断裂，因此迫切需要有效的响应预测方法。现有的理论方法主要是计算由切塔支撑的导体的最大跳高。然而，由于角塔和应变塔支撑的接地线和导线的行为与孤立跨相似，因此它们的不同响应特性使得传统的假设不适用，从而导致了很大的计算偏差。为了解决这一问题，本文引入了有效重量的概念，并对动态张力变化的两个潜在特征进行了研究。在状态离散化的基础上，提出了输电线路临界响应的封闭理论解。为了验证其准确性，将实验数据与有限元模拟结果进行了对比分析。在此基础上，系统地讨论了各参数对消冰响应的影响。结果表明，与现有方法相比，该方法能更准确地预测最大跳高，并能有效地估计隔跨导线和接地线的位移和应力。因此，该方法可以大大缩短分析时间，为实际工程中的结构设计和除冰作业提供有价值的评估。

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引用次数: 0

Experimental and hypoplastic model investigation of frozen soil mechanics: Integrating confining pressure, temperature, and ice content effects 冻土力学的实验和发育不良模型研究：围压、温度和含冰量的综合影响

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology

Pub Date : 2025-11-03 DOI: 10.1016/j.coldregions.2025.104742

Jiawei Zhang , Yongchao Zhang , Ke Ke , Lilin Li , Yanlong Li , Lele Liu , Changling Liu , Nengyou Wu

Frozen soils, widely distributed in polar, plateau, and high-latitude regions, have been experiencing accelerated degradation in recent decades due to climate change. This degradation alters the mechanical properties of frozen soils, posing threats to critical infrastructure construction and resource development, and potentially inducing geohazards. In this study, the mechanical behavior of frozen soils under different conditions was investigated through triaxial shear experiments. Subsequently, an eight-parameter hypoplastic model was established to predict the strength and deformation properties of frozen soil as influenced by temperature, confining pressure, and ice content. The experimental results indicate that lower temperatures and higher confining pressures enhance the mechanical properties of frozen soil. Conversely, ice content exhibits a threshold effect, whereby moderate ice cementation improves strength and stiffness whereas excessive ice leads to strength degradation. The proposed hypoplastic model shows good agreement with the experimental results, providing a reliable theoretical tool for analyzing the evolution of mechanical properties of frozen soil under varying environmental conditions.

近几十年来，由于气候变化，广泛分布于极地、高原和高纬度地区的冻土正在加速退化。这种退化改变了冻土的力学特性，对关键基础设施建设和资源开发构成威胁，并可能诱发地质灾害。通过三轴剪切试验，研究了不同条件下冻土的力学特性。随后，建立了8参数欠塑性模型，预测了温度、围压和含冰量对冻土强度和变形特性的影响。试验结果表明，较低的温度和较高的围压可以提高冻土的力学性能。相反，冰含量表现出阈值效应，即适度的冰胶结可以提高强度和刚度，而过量的冰则会导致强度下降。该模型与试验结果吻合较好，为分析不同环境条件下冻土力学特性的演变提供了可靠的理论工具。

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引用次数: 0