Results 31 to 40 of about 1,453 (122)
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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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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Study on influencing factors and experimental mechanism of free swelling rate of expansive soil [PDF]
Free swelling rate is a critical parameter for identifying and classifying swelling properties of expansive soils. In the current " Standard for Geotechnical Testing Method GB/T 50123—2019", numerous influencing factors affect free swelling rate tests ...
CHEN Yikun1 , CHU Ya1 , CAI Guojun2, YAN Chao3, LIU Songyu4, HAN Aimin1
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Analysis of crack evolution in large-volume concrete based on thermal mechanical coupling finite element method [PDF]
With the continuous increase in large-scale engineering projects, large-volume structures are encountering quality control issues during the concrete pouring process.
Anbing QIU
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Mechanism analysis on anisotropic degradation of sandstone in freeze thaw environment based acoustic emission [PDF]
In the freeze-thaw environments, the fracturing of bedding rock poses a significant threat to the stability of the projects in cold regions, leading to potential engineering accidents.
Bing LIU +4 more
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Research on pore structural change of gravel soil under seepage erosion based on CT scanning [PDF]
As the main component of the landslide accumulation layer, gravel soil is affected by hydrodynamic factors; the change of internal seepage pressure leads to the loss of soil particles, resulting in the change of meso structure and mechanical properties ...
Da HUANG, Wenbo HUANG, Yikang GAO
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, 2009 荒漠对气候变化具有高度敏感性,深刻认识和量化非生物因子对荒漠生态系统土壤呼吸的影响具有重要意义。采用自动CO2通量系统(Li-8100)监测了梭梭(Haloxylon ammodendron)、假木贼(Anabasis aphylla)和盐穗木(Halostachys caspica)群落生长季土壤呼吸及温度、土壤含水量等,深入分析了水热因子对土壤呼吸的影响。土壤呼吸具有不对称的日格局,最小值出现在8:00,最大值在12:00～14:00。土壤呼吸的季节格局与气温变化基本同步,最小值在生长季末期(10月)
张丽华 +3 more
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Shuitu Baochi Xuebao, 2018 以云南红土为研究对象，考虑干湿循环时间、干湿循环次数、初始干密度等影响因素，通过膨胀、收缩试验与图像处理相结合的方法，研究不同影响因素对云南红土胀缩特性的影响。结果表明：干湿循环过程中，红土的膨胀过程可以分为快速膨胀、缓慢膨胀和稳定膨胀3个阶段，收缩过程可以分为缓慢收缩、快速收缩和稳定收缩3个阶段。随增湿时间延长，红土的竖向膨胀率、含水率、孔隙率等膨胀参数呈“厂”形增大变化；随脱湿时间延长，竖向收缩率、横向收缩率、体积收缩率等收缩参数呈“S”形增大变化，含水率、孔隙率逐渐减小。随增湿次数增加 ...
范本贤 +4 more
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Susceptibility assessment of debris flow disaster based on machine learning models in the loess area along Yili Valley [PDF]
The Yili Valley, located on the border between China and Kazakhstan, serves as the juncture of North and South Xinjiang, and stands as a pivotal outpost on the Silk Road Economic Belt.
Mingyang WU +5 more
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Zhongguo shiyan zhenduanxue, 2012 心房颤动（atrial fibrillation,AF）是最常见的心律失常之一,具有较高的发病率、致残率和死亡率,尤其是风湿性心脏病患者中约60%伴有持续性房颤,内科干预难以转复或转复后易复发[1,2]。经过多年的研究和实践,心内直视手术同期行射频消融术逐渐成为干预心房颤动的首要方式之一,具有良好的窦性转复率和维持率[3,4]。我院自2006年1月-2011年6月,对76例风湿性心脏瓣膜病并发心房颤动患者行体外循环心内直视下瓣膜手术 ...
马野, 李哲, 林柏松
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