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饱和珊瑚砂三轴蠕变特性及经验模型 被引量:6
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作者 薛鹏 周先齐 +3 位作者 蔡燕燕 马林建 廖仁国 俞缙 《岩土工程学报》 EI CAS CSCD 北大核心 2020年第S02期255-260,共6页
对饱和珊瑚砂进行不同围压和偏应力水平下的三轴排水蠕变试验,结果显示:围压和偏应力对蠕变变形影响显著,具体表现为偏应力较大或围压较小时,蠕变形变量较大,蠕变现象明显。采用传统的Singh-Mitchell及Mesri蠕变模型描述珊瑚砂蠕变特性... 对饱和珊瑚砂进行不同围压和偏应力水平下的三轴排水蠕变试验,结果显示:围压和偏应力对蠕变变形影响显著,具体表现为偏应力较大或围压较小时,蠕变形变量较大,蠕变现象明显。采用传统的Singh-Mitchell及Mesri蠕变模型描述珊瑚砂蠕变特性,发现两者在高偏应力条件下模型计算结果与试验结果相差较大,无法准确描述珊瑚砂的蠕变行为。通过分析模型与试验结果误差较大的原因,并将应力–应变及应变–时间关系均采用双曲线函数表示,建立了一个新的蠕变模型,且新模型预测结果与试验结果一致性较好。 展开更多
关键词 珊瑚砂 蠕变特性 蠕变模型
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Study on Refined Forecast Method of Daily Maximum Temperature in Wugang City from July to September 被引量:1
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作者 liao ren-guo LV Xiao-hua +2 位作者 LIU Xu-lin HE Wei-hui DAI Chuan-hong 《Meteorological and Environmental Research》 CAS 2012年第3期6-8,共3页
[Objective] The aim was to study the refined forecast method of daily highest temperature in Wugang City from July to September. IM[ethod] By dint of ECMWF mode product and T231 in 2009 and 2010 and daily maximum temp... [Objective] The aim was to study the refined forecast method of daily highest temperature in Wugang City from July to September. IM[ethod] By dint of ECMWF mode product and T231 in 2009 and 2010 and daily maximum temperature in the station in corresponding period, multi-factors similar forecast method to select forecast sample, multivariate regression multi-mode integration MOS method, after dynamic corrected mode error and regression error, dynamic forecast equation was concluded to formulate the daily maximum temperature forecast in 24 -120 h in Wugang City from July to September. [ Result] Through selection, error correction, the daily maximum temperature equation in Wugang City from July to September was concluded. Through multiple random sampling, F test was made to pass test with significant test of 0.1. [ Conclusionl The method integrated domestic and foreign forecast mode, made full use of useful information of many modes, absorbed each others advantages, con- sidered local regional environment, lessen mode and regression error, and improved forecast accuracy. 展开更多
关键词 Daily maximum temperature Multi-mode integration MOS method Dynamic forecast equatio China
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