Results 21 to 30 of about 1,499 (122)
Effects of drying-wetting cycle caused by rainfall on soil respiration: Progress and prospect [PDF]
, 2018 Soil respiration is an important part of the carbon cycle in terrestrial ecosystems. The changes of soil respiration caused by rainfall directly affect global carbon balance.
朱连奇 +3 more
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Study on the Corrosion and Protection of the Coated Steel Rebar in Concrete [PDF]
, 2007 钢筋的腐蚀破坏是导致混凝土结构过早失效的首要因素，造成了巨大的经济损失。尽管已发展了多种涂层技术用于混凝土中钢筋的腐蚀防护，但其保护效果和保护机理仍然有争议。研究混凝土中钢筋的腐蚀与防护机理，探索先进、高效的钢筋混凝土保护方法成为一项重大而紧迫的任务。进一步发展用于表面有涂覆层的钢筋在混凝土中腐蚀防护行为的无损检测技术，评价钢筋混凝土结构的安全性和耐久性显得尤为重要。本论文主要针对表面有涂覆层的钢筋在混凝土中的腐蚀行为与防护效果，涂覆层机械损伤对其保护作用的影响 ...
赵冰
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Mechanical Properties of Gangue-steel Slag-ore Powder Mixture [PDF]
In order to explore the mechanical properties of the coal gangue-steel slag-ore powder mixture without alkali initiator, the solid waste materials coal gangue, steel slag and mineral powder produced in Handan Area were taken as the research objects, and ...
Hanlong CUI +4 more
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Progress of the special-subjects study on the construction of comprehensive geological disaster prevention and control system in Yunnan Province [PDF]
, 2023 The establishment of the comprehensive geological disaster prevention and control system in Yunnan province stands as China’s most extensive and grand-scale endeavor in safeguarding the prevention and control of geological disasters in China.
Cheng HUANG +8 more
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Shuitu Baochi Xuebao, 2016 针对发育于花岗岩出露区的崩岗土体易受干湿循环影响导致大量崩壁失稳等问题,通过开展一系列室内无侧限抗压强度试验，研究崩岗不同层次土体在干湿循环作用下无侧限抗压强度的变化规律，并且建立了崩岗不同层次土体深度比和干湿循环次数共同影响下的无侧限抗压强度模型。结果表明：表土层、红土层、斑纹层、碎屑层在第1次干湿循环后无侧限抗压强度衰减幅度最大，分别为26%，15%，40%和49%；在第2～4次干湿循环后无侧限抗压强度衰减幅度逐渐减小；在第5次干湿循环后无侧限抗压强度基本保持不变；随着干湿循环次数的增加 ...
卫 +5 more
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Experiment and modeling of soil-water characteristic curve of unsaturated residual soil [PDF]
, 2014 土-水特征曲线是指基质吸力与含水率或饱和度的关系曲线。土-水特征及其相关数学模型可用于非饱和土性质如渗透系数和抗剪强度模型的建立。通常,土-水特征曲线仅有脱湿曲线。笔者详细讨论了初始含水率、干密度、竖向应力及干湿循环对脱湿曲线的影响。采用滤纸法测试了厦门地区残积土的土-水特征曲线(SWCC)及滞回环。结果表明,初始含水率对SWCC影响较小,最优含水率干侧试样SWCC的进气值小,滞回环小;湿侧试样的进气值大,滞回环大;最优含水率试样的滞回环居中。初始干密度对SWCC有显著影响,低干密度试样SWCC进气值小,
陈东霞, 龚晓南
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Evolution law of mechanical properties of red mudstone fill material under long-term relative humidity cycles [PDF]
Red mudstone fill material (RMF) is highly sensitive to water content. Evolution on mechanical properties of RMF subgrade during long-term relative humidity cycles would be induced by the change of seasons.
CHEN Kang1, 2 , LIU Xianfeng1, 2 , JIANG Guanlu1, 2, YUAN Shengyang1, 2, MA Jie1, 2, CHEN Yihan1, 2
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Shuitu Baochi Xuebao, 2016 通过对湖北通城花岗岩崩岗区发育典型的各层次土体（淋溶层、淀积层、过渡层、母质层）进行干湿循环试验，分析干湿交替次数对各层次土体裂隙发育、崩解性、抗剪强度的影响。结果表明，在干湿循环影响下，土体产生并逐渐发育裂隙，在第2次循环后，土体产生主要裂隙，裂隙比显著增加，此后循环发育出细小裂隙。4次交替后4个层次土体的裂隙比表现为淀积层＞淋溶层＞过渡层＞母质层。随着干湿循环次数的增加，裂隙发育，各层次土体崩解性不断增加，淋溶层和淀积层崩解缓慢，而过渡层和母质层能够在极短时间内完全崩解；随着干湿循环次数的增加 ...
刘昌鑫 +4 more
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Mechanism of steel slag powder stabilization and improvement of expansive clay [PDF]
Expansive clay is prone to geological disasters such as roadbed deformation, slope instability, and landslides under long-term hot and humid conditions.
Chuan YU +3 more
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Shuitu Baochi Xuebao, 2018 以云南红土为研究对象，以脱湿、吸湿引起的干湿循环作为控制条件，考虑初始干密度（1.20，1.25，1.30 g/cm3）、初始含水率（30.0%，33.0%，36.0%）、预固结压力（0，50，100，200 kPa）、过筛粒径（0.5，1.0，2.0 mm）等影响因素，通过压力板仪法，研究干湿循环下云南非饱和红土的土—水作用特性。结果表明：干湿循环过程中，不同影响因素下红土的基质吸力随含水率的增大而减小，其土—水特征曲线呈直线型或"倒J"形，其脱湿变化过程可以分为快速脱湿、缓慢脱湿、稳定脱湿3个阶段 ...
黄英, 程富阳, 金克盛
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