Research in Cold and Arid Regions最新文献_第2页

Glaciers and their changes based on Chinese glacier inventories in Ili River Basin, Xinjiang, northwestern China 基于中国冰川清查的伊犁河流域冰川及其变化

IF 2.3 4区地球科学 Q4 GEOGRAPHY, PHYSICAL

Research in Cold and Arid Regions

Pub Date : 2025-10-01 DOI: 10.1016/j.rcar.2025.04.001

ZeXin Zhan , ZhongQin Li , JianXin Mu , Hao Ma , QiBin Liang , Qian Wang , HaiYang Xi , FeiTeng Wang , YeFei Yang , WeiBo Zhao , ZhiXiang Lu

The Ili River is a typical transboundary river between China and Kazakhstan, with glaciers within its basin serving as a crucial solid water resource. Recently, we compiled the Chinese Glacier Inventory of Xinjiang in 2020 (CGI-XJ2020) using high-resolution satellite imagery (<2 m), based on visual interpretation. This study presented the state of glaciers in the Ili River Basin in 2020 by utilizing the data from CGI-XJ2020. It quantified glacier changes in 1960s–2020 based on CGI-XJ2020 and revised datasets from the First and Second Chinese Glacier Inventories. The results indicated that in 2020, the Ili River Basin contained 2,177 glaciers, totaling 1,433.19 km² in area. Among them, 213 glaciers were covered by 57.43 km² of debris. The total uncertainty in glacier area was 46.43 km², accounting for approximately 3.2% of the total area. Mapped glacier areas varied from 0.003 to 74.67 km², with an average area of 0.66 km² and a median area of 0.15 km². Glaciers <0.5 km² in size dominated in numbers, accounting for 75.1% of the total. Glaciers in the basin have undergone significant retreat during 1960s–2020, with their total area decreasing by 589.38 km² (29.15%). A total of 495 glaciers (with an area of 49.67 km²) disappeared. The average annual glacier area retreat rates for 1960s−2007 and 2007–2020 were 10.86 km²/a (0.54%/a) and 9.41 km²/a (0.61%/a), respectively, showing a continued acceleration in glacier shrinkage, despite a slight decrease in absolute retreat rates.

伊犁河是中哈两国间典型的跨界河流，流域内的冰川是重要的固体水资源。最近，我们利用高分辨率卫星图像（<2 m），基于目视解译编制了2020年中国新疆冰川清查（CGI-XJ2020）。利用CGI-XJ2020数据，对伊犁河流域2020年冰川状况进行了研究。基于CGI-XJ2020和中国第一次和第二次冰川清查数据集，量化了1960 - 2020年的冰川变化。结果表明：2020年伊犁河流域共包含冰川2177个，总面积1433.19 km2；其中，213座冰川被57.43 km2的碎屑覆盖。冰川面积的总不确定性为46.43 km2，约占总面积的3.2%。绘制的冰川面积变化范围为0.003 ~ 74.67 km2，平均面积为0.66 km2，中位面积为0.15 km2。0.5 km2的冰川在数量上占主导地位，占总数的75.1%。1960—2020年，流域冰川退缩明显，总面积减少589.38 km2（29.15%）。共有495座冰川消失，面积49.67 km2。60 ~ 2007年和2007 ~ 2020年冰川面积年平均退缩率分别为10.86 km2/a （0.54%/a）和9.41 km2/a (0.61%/a)，尽管绝对退缩率略有下降，但冰川萎缩仍在持续加速。

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引用次数: 0

Glacier distribution and changes over the past 50 years in the Kaidu-Konqi River Basin, northwestern China 开都-康奇河流域近50年冰川分布与变化

IF 2.3 4区地球科学 Q4 GEOGRAPHY, PHYSICAL

Research in Cold and Arid Regions

Pub Date : 2025-10-01 DOI: 10.1016/j.rcar.2025.08.001

MengWei Xu , Lin Wang , ZhongQin Li , ZeXin Zhan , JianXin Mu , Hao Ma , FeiTeng Wang , Xiang Jin

As a highly sensitive indicator of climate change in the arid northwest region of China, glacier dynamics in the Kaidu-Konqi River Basin directly influence regional runoff patterns, thereby playing a crucial role in shaping regional hydrology and maintaining ecological stability. This study systematically assessed glacier distribution in 2020 and analyzed glacier changes from 1972 to 2020 using the Chinese Glacier Inventory of Xinjiang in 2020 (CGI-XJ2020), historical satellite imagery from 1972, and data from the Second Chinese Glacier Inventory. In 2020, the basin contained 713 glaciers covering 313.99 km², with an estimated glacier volume of 11.81 km³ (0.41% glacier coverage). Glaciers were predominantly clustered in the northern and southwestern mountains. Small glaciers (<0.5 km²) comprised 78% of the glacier count but only 3% of the total area, whereas glaciers ≥0.5 km² accounted for 97% of the total area and 83.6% of the glacier volume. From 1972 to 2020, the total glacier area decreased by 42.28% (229.99 km²) and glacier volume by 49.51% (11.58 km³), equating to mean annual rates of −0.88% and −1.03%, respectively. Glacier retreat drives temporary increases in meltwater supply but threatens long-term regional runoff stability and ecological water security. The retreat rate varied over different periods, with a more pronounced decline observed between 1972 and 2007. These findings highlight an accelerating glacier loss in the basin, underscoring the need for continued monitoring and assessment of its hydrological and ecological impacts.

作为中国西北干旱区气候变化的高度敏感指标，开都河-康齐河流域冰川动态直接影响区域径流格局，从而在塑造区域水文和维持生态稳定方面发挥着至关重要的作用。利用《2020年中国新疆冰川清查》（CGI-XJ2020）、1972年历史卫星影像和第二次中国冰川清查资料，系统评估了2020年冰川分布，分析了1972 - 2020年冰川变化。2020年，该流域有713条冰川，覆盖面积313.99 km2，冰川体积估计为11.81 km2（冰川覆盖率0.41%）。冰川主要集中在北部和西南部山区。小冰川（0.5 km2）占冰川总数的78%，但仅占总面积的3%，而≥0.5 km2的冰川占总面积的97%，占冰川体积的83.6%。1972 - 2020年，冰川总面积减少42.28% (229.99 km2)，冰川体积减少49.51% (11.58 km3)，年均减少率分别为- 0.88%和- 1.03%。冰川退缩导致融水供应暂时增加，但威胁到长期的区域径流稳定和生态水安全。退缩率在不同时期有所不同，1972年至2007年期间观察到更明显的下降。这些发现突出表明，该流域的冰川正在加速流失，强调有必要继续监测和评估其水文和生态影响。

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引用次数: 0

Glacier distribution, changes and the influence of debris in the Aksu River Basin, Tianshan central Asia 中亚天山阿克苏河流域冰川分布、变化及碎屑影响

IF 2.3 4区地球科学 Q4 GEOGRAPHY, PHYSICAL

Research in Cold and Arid Regions

Pub Date : 2025-10-01 DOI: 10.1016/j.rcar.2025.07.003

QiBin Liang , ZhongQin Li , ZeXin Zhan , JianXin Mu , Hao Ma , FeiTeng Wang , YuFeng Jia , Qian Wang , Wei Chen , YeFei Yang , WeiBo Zhao

Based on the Chinese Glacier Inventory of Xinjiang in 2020 (CGI-XJ2020), we analyzed glacier distribution in the Aksu River Basin and examined glacier changes using datasets from Chinese three-period inventories. In 2020, the basin contained 3,491 glaciers, covering 4,144.84 km², and estimated their ice volume at 345.05 km³. The largest glacier areas appeared at elevations between 3,800 and 4,100 m (29.70%), and northern-oriented glaciers dominated both in number (33.73%) and area (35.68%). From 1963 to 2007, glacier area decreased by 361.22 km², with an annual retreat rate of 0.38%. From 2007 to 2020, the area decreased by 118.88 km², showing a higher retreat rate of 0.51%, indicating accelerated melting. Glaciers shrank rapidly across all orientations, with the fastest reductions occurring in the southwest and the slowest in the northwest. The extent of glacier area change was influenced by glacier area and debris. Debris-covered glaciers were widespread in the Aksu River Basin, with larger glaciers showing an increase in debris. Debris reduced the rate of terminus retreat in large glaciers, while glaciers with thinner debris layers experienced more pronounced melting, with large ice tongues at lower altitudes shrinking rapidly, while high-altitude regions remained relatively stable.

基于《2020年中国新疆冰川清查》（CGI-XJ2020），分析了阿克苏河流域冰川分布，并利用中国三期清查数据对冰川变化进行了分析。2020年，该流域共包含3491个冰川，覆盖面积4144.84 km2，估算其冰量为345.05 km2。海拔3800 ~ 4100 m的冰川面积最大（29.70%），北向冰川在数量和面积上均占主导地位（33.73%）。1963—2007年，冰川面积减少361.22 km2，年退缩率为0.38%。2007 - 2020年，冰川面积减少118.88 km2，退缩率为0.51%，融化速度加快。冰川在所有方向上都迅速缩小，西南方向的减少速度最快，西北方向的减少速度最慢。冰川面积变化的程度受冰川面积和碎屑的影响。碎屑覆盖的冰川在阿克苏河流域广泛存在，较大的冰川碎屑增加。碎屑降低了大型冰川末端退缩的速度，而碎屑层较薄的冰川融化更为明显，低海拔地区的大冰舌萎缩迅速，而高海拔地区保持相对稳定。

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引用次数: 0

The Chinese Glacier inventory of Xinjiang in 2020 (CGI-XJ2020): Compilation, features and primary results 2020年中国新疆冰川清查（CGI-XJ2020）：编制、特征与初步成果

IF 2.3 4区地球科学 Q4 GEOGRAPHY, PHYSICAL

Research in Cold and Arid Regions

Pub Date : 2025-10-01 DOI: 10.1016/j.rcar.2025.09.001

ZhongQin Li , ZeXin Zhan , YeFei Yang , QiBin Liang , JianXin Mu , FeiTeng Wang , HuiLin Li

Based on China's high-resolution satellite imagery series (2 m resolution), the Chinese Glacier Inventory of Xinjiang in 2020 (CGI-XJ2020) was compiled, with 2020 as the baseline year. CGI-XJ2020 has five key features: 1) improved accuracy in glacier boundary delineation and optimized inventory attributes through high-resolution satellite imagery and field validation of 38 glaciers; 2) established an area-volume formula for Xinjiang glaciers using ground-penetrating radar (GPR) thickness data from 23 glaciers in the study region; 3) the use of high-resolution satellite imagery has reduced the minimum glacier area threshold, enabling the identification of more small glaciers; 4) enhanced accuracy in delineating supraglacial debris coverage; 5) upgraded administrative division from prefecture-level (CGI-2) to county-level. According to CGI-XJ2020 data, Xinjiang contains 24,202 glaciers in 2020, covering 23,629.28 km² with an average size of 0.98 km² per glacier and a total ice volume of 1,608.94 km³. Among these, 1,612 debris-covered glaciers occupy 1,163.32 km² (4.9% of the total glacierized area). Glaciers larger than 10 km² (296 in total) cover 9,881.69 km² with a volume of 1,053.17 km³, accounting for 41.82% of total area and 65.46% of total ice volume, respectively. The Kunlun Mountains host the most glaciers, followed by the Tianshan Mountains. The Tarim river basin contains the largest concentration (15,860 glaciers, 18,594.24 km², 1,347.17 km³). The Hotan Prefecture has the highest glacier density.

基于中国高分辨率卫星影像系列（2m分辨率），以2020年为基准年，编制了《2020年中国新疆冰川清查》（CGI-XJ2020）。CGI-XJ2020具有以下五个主要特点：1)通过38个冰川的高分辨率卫星影像和实地验证，提高了冰川边界圈定的精度，优化了库存属性；2)利用研究区23个冰川的探地雷达（GPR）厚度数据，建立了新疆冰川的面积-体积公式；3)高分辨率卫星图像的使用降低了最小冰川面积阈值，从而能够识别更多的小冰川；4)提高了对冰上碎屑覆盖范围的准确圈定；5)行政区划由地级市（CGI-2）升级为县级。根据gis - xj2020数据，2020年新疆有冰川24202条，覆盖面积23629.28 km2，平均每条冰川大小为0.98 km2，总冰量为1608.94 km2。其中，碎屑覆盖冰川1612条，覆盖面积1163.32 km2，占总冰川面积的4.9%。大于10 km2的冰川面积为9881.69 km2（共296个），体积为1053.17 km3，分别占总面积的41.82%和总冰积的65.46%。冰川最多的是昆仑山，其次是天山。塔里木河流域冰川最集中（15860个，18594.24 km2, 1347.17 km3）。和田地区的冰川密度最高。

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引用次数: 0

Efficiency accounting for the conversion of "Green Mountains and Clear Water" into "Gold and Silver Mountains": An empirical study of Qilian Mountain national park in China “青山绿水”向“金山银山”转化的效率核算——以中国祁连山国家公园为例

IF 2.3 4区地球科学 Q4 GEOGRAPHY, PHYSICAL

Research in Cold and Arid Regions

Pub Date : 2025-08-01 DOI: 10.1016/j.rcar.2024.12.009

Na Wu , Xiang Pan , XiaoYu Song , RuiDong Zhao , YuanGuo Long

The research on the conversion efficiency of "Green Mountains into Clear Water" (Green) and "Gold and silver Mountains" (Gold) is of great significance to promote the coordination between natural resource conservation in national park and the local economic and social development. This paper pays attention to the linking role of ecosystem services in different stages of the conversion process between the Green and Gold. Based on the two-stage division, this paper constructs the accounting framework for conversion efficiency of Green and Gold. That is, the comprehensive conversion efficiency of Green and Gold is decomposed into the I-stage efficiency of ecological inputs conversion to Green and the II-stage efficiency of ecosystem services conversion to economic output. Furthermore, the Qilian Mountain National Park in China and its surrounding area Zhangye City, is taken as an example. Using a two-stage non-oriented super-efficiency network EBM model and panel data from 2007 to 2018 to empirically analysis the dynamic evolution characteristics of the conversion efficiency of Green and Gold. Based on this, the heterogeneity improvement strategy is proposed. The results show that: (1) the comprehensive efficiency of the Two Mountains conversion in Zhangye City decreased first and then increased. The highest was 1.715 in 2007; the lowest was 1.367 in 2012; since 2012, the development has gradually improved. The main reason for the decrease in the comprehensive efficiency from 2007 to 2012 is the lower conversion efficiency in II-stage. (2) Spatial difference analysis shows that the areas with low the comprehensive efficiency were concentrated in Sunan, Minle, and Shandan Counties along the Qilian Mountains. The comprehensive efficiency was 0.406, 0.489 and 0.482 respectively. The key to improving the comprehensive efficiency of Sunan County and Minle County is II-stage, while the focus of improving Shandan County is I-stage. (3) Redundancy analysis found that the main factor affecting the comprehensive efficiency of the Two Mountains conversion is insufficient output. In the future, we should focus on expanding effective pathways for the Two Mountains conversion and innovating institutional mechanisms for realizing ecological value.

研究“青山绿水”（Green）和“金山银山”（Gold）的转化效率，对于促进国家公园自然资源保护与地方经济社会发展的协调具有重要意义。研究了绿金转换过程中不同阶段生态系统服务功能的联系作用。在两阶段划分的基础上，构建了绿色与黄金转换效率的会计核算框架。即将Green和Gold的综合转化效率分解为生态投入向Green转化的i阶段效率和生态系统服务向经济产出转化的ii阶段效率。此外，以中国祁连山国家公园及其周边地区张掖市为例。利用两阶段非定向超效率网络EBM模型和2007 - 2018年面板数据，实证分析了绿色和黄金转换效率的动态演化特征。在此基础上，提出了异构性改进策略。结果表明：(1)张掖市两山转换综合效率呈现先下降后上升的趋势。最高的是2007年的1.715；最低的是2012年的1.367；自2012年以来，发展逐渐改善。2007 - 2012年综合效率下降的主要原因是ii期转化效率较低。②综合效率较低的区域主要集中在祁连山沿线的苏南、民乐和山丹县。综合效率分别为0.406、0.489和0.482。苏南县和民乐县综合效益提升的重点是ii期，山丹县综合效益提升的重点是i期。(3)冗余分析发现，影响两山转换综合效率的主要因素是输出不足。未来要着力拓宽“两山转换”的有效路径，创新实现生态价值的体制机制。

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引用次数: 0

Mechanical behavior and improved hypoplastic constitutive model for saturated frozen sand 饱和冻砂力学行为及改进的欠塑性本构模型

IF 2.3 4区地球科学 Q4 GEOGRAPHY, PHYSICAL

Research in Cold and Arid Regions

Pub Date : 2025-08-01 DOI: 10.1016/j.rcar.2024.12.005

ZhaoMing Yao, XiangBin Fu, Nan Li

The artificial ground-freezing method is the main technical means for the excavation of mines and tunnels through the water-rich sand layer, and the comprehensive understanding of the mechanical properties of frozen saturated sand and the stress-strain relationship under complex stress can provide important guidance. In this study, a series of true triaxial tests of frozen saturated sand samples were conducted. Combined with the test data, the effects of temperature and medium principal stress ratio (b) on the strength and deformation characteristics of frozen saturated sand are discussed. In addition, a cohesion tensor is introduced to the Wu-Lin hypoplastic model. A scalar value is used to characterize the effect of temperature on the strength of frozen soil. The defect that the original model cannot describe the tensile capacity of frozen soil under low stress conditions is clearly solved. In addition, the cumulative deformation state variable is introduced to improve the response performance of the model in triaxial compression tests. The hypoplastic model of frozen soil has shown good performance in simulating triaxial compression tests at different temperatures and medium principal stress ratios.

人工冻地法是矿井、隧道穿越富水砂层开挖的主要技术手段，全面认识冻结饱和砂的力学特性及复杂应力作用下的应力-应变关系可提供重要指导。本研究对冻结饱和砂样进行了一系列真三轴试验。结合试验数据，讨论了温度和介质主应力比(b)对冻结饱和砂强度和变形特性的影响。此外，在Wu-Lin发育不良模型中引入了内聚张量。用标量值来表示温度对冻土强度的影响。解决了原模型不能描述低应力条件下冻土抗拉能力的缺陷。此外，为了提高模型在三轴压缩试验中的响应性能，还引入了累积变形状态变量。在不同温度和中等主应力比条件下，冻土发育不良模型在模拟三轴压缩试验中表现出良好的性能。

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引用次数: 0

Perceived value, awe, and place attachment: Influencing tourists' environmentally responsible behavior in desert tourism 感知价值、敬畏与地方依恋：对沙漠旅游游客环境责任行为的影响

IF 2.3 4区地球科学 Q4 GEOGRAPHY, PHYSICAL

Research in Cold and Arid Regions

Pub Date : 2025-08-01 DOI: 10.1016/j.rcar.2025.02.005

Shan Huang , LiJuan Shi , DanHua Sheng , TianTian He , Xing Guo , JianHua Xiao

This study explores the impact of perceived value, awe, and place attachment on tourists' environmentally responsible behavior (ERB) in desert tourism contexts, using the Singing Sands Mountain and Crescent Spring scenic area in Dunhuang, China as a case study. Data were collected from 315 tourists using a structured questionnaire and analyzed through a structural equation model. Results show that perceived value and awe significantly influence ERB both directly and indirectly via place attachment. Specifically, perceived value has a stronger direct effect on ERB compared to awe, highlighting the importance of tourists' overall evaluation of the destination in promoting sustainable behaviors. The mediating role of place attachment underscores the significance of emotional connections to the environment in fostering ERB. These findings provide valuable insights for sustainable tourism management in fragile desert ecosystems. The study also highlights the importance of enhancing perceived value through high-quality services and leveraging awe-inspiring experiences to promote sustainable behaviors.

本研究以敦煌唱沙山和月牙泉景区为研究对象，探讨沙漠旅游情境下感知价值、敬畏和地点依恋对游客环境责任行为的影响。采用结构化问卷对315名游客进行数据收集，并通过结构方程模型进行分析。研究结果表明，感知价值和敬畏通过位置依恋对erbb有直接和间接的影响。具体而言，与敬畏相比，感知价值对ERB有更强的直接影响，突出了游客对目的地的整体评价在促进可持续行为方面的重要性。地点依恋的中介作用强调了与环境的情感联系在培养erbb中的重要性。这些发现为脆弱沙漠生态系统的可持续旅游管理提供了有价值的见解。该研究还强调了通过高质量服务和利用令人惊叹的体验来促进可持续行为来提高感知价值的重要性。

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引用次数: 0

Optimized ultrasonic assisted flavonoids extraction from an annual desert plant of Agriophyllum squarrosum and its implications for natural antimicrobial agent 荒漠一年生植物沙米黄酮类化合物的超声辅助提取及其对天然抗菌剂的影响

IF 2.3 4区地球科学 Q4 GEOGRAPHY, PHYSICAL

Research in Cold and Arid Regions

Pub Date : 2025-08-01 DOI: 10.1016/j.rcar.2024.12.002

ChaoJu Qian , ShanShan Zhou , Xia Yan , XiaoYue Yin , TingZhou Fang , XingKe Fan , XiaoFei Ma

Sand rice (Agriophyllum squarrosum), a pioneering annual plant thriving in deserts and sandy regions throughout the Asian interior, is believed to be a potential food and forage crop due to its significant nutritional and medicinal values. Previous metabolomics analyses have revealed that sand rice contains abundant flavonoid components, which are known for their wide applications in cosmetics, food, and pharmaceuticals. To optimize the use of flavonoids in sand rice, in this study, the response surface methodology (RSM) was selected to determine the optimal ultrasonic-assisted extraction (UAE) criteria for flavonoids extraction from the aerial part of sand rice firstly. Statistical analyses unveiled the optimum parameters for flavonoids extraction from sand rice could be 62% of ethanol concentration, 1:43 solid-to-liquid ratio, 160 W for ultrasound power, and 52 °C for extraction temperature with extraction time of 12 min. Under this condition, the experiment optimum total flavonoid yield could reach at 15.24 mg/g, which was correspond to the maximum predicted value of RSM with 15.22 mg/g. Subsequently, the antifungal efficacy of these extracts was evaluated against three common plant pathogenic fungi, showing a significant inhibitory effect with the highest rate of inhibition reaching 25.3% at a concentration of 4 mg/mL, underscoring its potential as a natural antimicrobial agent. This study will not only provide a powerful method to extract flavonoids from a desert resource plant, but also pave the way for industrial development and application of the promising desert plants with high nutritional and medicinal values.

沙稻（Agriophyllum squarrosum）是一种开创性的一年生植物，生长在亚洲内陆的沙漠和沙质地区，由于其重要的营养和药用价值，被认为是一种潜在的粮食和饲料作物。先前的代谢组学分析表明，沙米含有丰富的类黄酮成分，在化妆品、食品和药品中有着广泛的应用。为了优化沙米中黄酮类化合物的利用，本研究首先采用响应面法（RSM）确定了沙米空中部分黄酮类化合物的最佳超声辅助提取标准。经统计分析，砂米黄酮提取的最佳工艺参数为乙醇浓度62%，料液比1:43，超声功率160 W，提取温度52℃，提取时间12 min。在此条件下，试验总黄酮的最佳产率为15.24 mg/g，与RSM的最大预测值15.22 mg/g相对应。随后，对三种常见植物病原真菌的抑菌效果进行了评价，结果表明，在浓度为4 mg/mL时，其抑菌率最高达25.3%，显示出其作为天然抗菌药物的潜力。本研究不仅为从荒漠资源植物中提取黄酮类化合物提供了一种有力的方法，而且为具有高营养和药用价值的荒漠植物的产业化开发和应用奠定了基础。

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引用次数: 0

Strength deterioration law and microstructural mechanism in concrete sprayed with inorganic coatings under the freeze–thaw cycle 冻融循环下喷施无机涂层混凝土强度劣化规律及细观结构机理

IF 2.3 4区地球科学 Q4 GEOGRAPHY, PHYSICAL

Research in Cold and Arid Regions

Pub Date : 2025-08-01 DOI: 10.1016/j.rcar.2025.05.008

ZhaoXia Zhu , Jing Luo , WuJian Yan

Based on compressive strength analysis, ultrasonic velocity testing and microstructural damage of three groups of concrete sprayed with inorganic coatings with different mix ratios were carried out under the freeze and thaw cycles (F-T). The strength attenuations of three groups of concrete were investigated, and a linear regression model showing the relationship model between acoustic parameters of three groups of concrete and their physico-mechanical properties were constructed, and the micro-mechanism behind the strength decay of concrete was explained via scanning electron microscopy. The results show that in case of the same F-T cycles concrete sprayed inorganic coating adding a polypropylene fibre leads to a good anti-freezing performance. The trend in ultrasonic velocity decay in concrete under the F-T cycles is consistent with the trend in compression strength change. The ultrasonic velocity (UV) of the concrete shows a great correlation with compression strength: the greater the compression strength of concrete, the higher the UV. The losses in compressive strength of concrete in the three kinds (A, B and C, A is with silica fume, B is plain concrete, C is with polypropylene fibres) after 300 freeze–thaw cycles are 54.55%, 62.25% and 22.26%, respectively, which of ultrasonic compressive wave velocities are 13.81%, 16.65% and 3.77%, respectively. Concrete strength decreases during the freeze–thaw process; this is microscopically manifested as large pores, an increase in cracks, and the development of scattered primary pores affecting the centralised connectivity. The cracks of A group have a width of 5–10 μm, which of B group have a width of 5–20 μm), which of C group have a width of 1–2 μm. The whole process of F-T is the process of generating and enlarging cracks in the inner microstructure of the concrete, which results in a markedly reduction in the mechanical characteristics of concrete.

基于抗压强度分析、超声测速测试及三组不同掺量无机涂层喷涂混凝土在冻融循环下的微观结构损伤。研究了三组混凝土的强度衰减，建立了三组混凝土声学参数与其物理力学性能关系的线性回归模型，并通过扫描电镜解释了混凝土强度衰减的微观机理。结果表明，在相同的F-T循环次数下，喷施无机涂层的混凝土在添加聚丙烯纤维的情况下具有较好的抗冻性能。在F-T循环作用下，超声速度衰减趋势与混凝土抗压强度变化趋势一致。混凝土的超声波速度（UV）与抗压强度有很大的相关性：混凝土的抗压强度越大，UV越高。A、B、C三种混凝土（A为掺硅灰，B为素混凝土，C为掺聚丙烯纤维）300次冻融循环后抗压强度损失分别为54.55%、62.25%和22.26%，超声压缩波速分别为13.81%、16.65%和3.77%。冻融过程中混凝土强度降低；微观上表现为孔隙增大，裂缝增多，分散原生孔隙发育，影响集中连通性。A组裂纹宽度为5 ~ 10 μm， B组裂纹宽度为5 ~ 20 μm， C组裂纹宽度为1 ~ 2 μm。F-T的整个过程是混凝土内部微观结构裂缝产生和扩大的过程，导致混凝土的力学特性显著降低。

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引用次数: 0

Fracture characteristics and process zone evolution in sandstone under freeze-thaw cycles 冻融循环作用下砂岩断裂特征及过程带演化

IF 2.3 4区地球科学 Q4 GEOGRAPHY, PHYSICAL

Research in Cold and Arid Regions

Pub Date : 2025-08-01 DOI: 10.1016/j.rcar.2025.03.010

MeiLu Yu , ZhongWen Wang , Ding Ma , JinJin Ge , YaTing Wang , HaoTian Xie , GenShui Wu , YaoYao Meng

This study investigates the fracture characteristics and the fracture process zone (FPZ) of mode Ⅰ fracture in sandstone, aiming to analyze the propagation behaviors of mode Ⅰ crack under different freeze-thaw cycles. Semi-circular bending tests (SCB) were conducted using different freeze-thaw cycles to evaluate mode Ⅰ fracture toughness, FPZ dynamics, and macroscopic microscopic features. Digital image correlation (DIC) and scanning electron microscopy (SEM) techniques were employed for detailed analysis. Experimental results reveal that freeze-thaw cycling leads to the widening of both preexisting and newly formed microcracks between internal particles. Under external loading, crack propagation deviates from prefabricated paths, forming serrated crack patterns. The FPZ initiates at the prefabricated crack tip and extends toward the loading end, exhibiting an arc-shaped tip shape. The FPZ length increases with loading but decreases after reaching a peak value. With additional freeze-thaw cycles, the maximum FPZ length first increases and then diminishes.

研究了砂岩中Ⅰ型裂缝的断裂特征和断裂过程区（FPZ），分析了Ⅰ型裂缝在不同冻融循环作用下的扩展行为。采用不同的冻融循环进行半圆弯曲试验（SCB），以评估模式Ⅰ断裂韧性、FPZ动力学和宏观微观特征。采用数字图像相关（DIC）和扫描电子显微镜（SEM）技术进行详细分析。实验结果表明，冻融循环会导致内部颗粒间原有微裂纹和新形成微裂纹的扩大。在外部载荷作用下，裂纹扩展偏离预制路径，形成锯齿状裂纹模式。FPZ从预制裂纹尖端开始，向加载端延伸，呈现出弧形的尖端形状。FPZ长度随载荷的增加而增加，但在达到峰值后减小。随着冻融循环次数的增加，最大FPZ长度先增大后减小。

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引用次数: 0