摘要
为探究流凌期天然浮石混凝土的服役寿命,设计了多种试验工况的冰-天然浮石混凝土往复滑动磨损加速试验,在不同磨损路径下测试天然浮石混凝土的累计磨损量,并基于Weibull分布开展寿命可靠性建模,采用最佳线性无偏估计法与最小二乘法2种估计方法分别进行参数估计.试验结果表明:基于Weibull分布的可靠度曲线有效描述了天然浮石混凝土在冰磨损作用下的加速失效过程,其中,天然浮石混凝土可靠度曲线为单调减小的三阶段分布,其耐磨性在加速损伤阶段的衰减现象最为明显;在2类方法中,形状参数值受方法的影响波动最大,在可靠度下降初期最小二乘法计算的可靠性寿命小于最佳线性无偏估计法求得的可靠性寿命;在0.5可靠度下,选择最小二乘法计算的寿命作为冰磨损作用下天然浮石混凝土极限寿命,研究结果为提升天然浮石混凝土耐磨性与安全性提供了理论参考.
An accelerated ice-natural pumice concrete reciprocating sliding wear test under various test conditions was designed.The accumulated wear of natural pumice concrete under various wear paths was tested.Life reliability modeling based on the Weibull distribution to investigate the service life of natural pumice concrete during the flowing period was performed.The least square estimation and the best linear unbiased estimation methods were respectively,used to estimate the various parameters.The experimental results demonstrate that the reliability curves based on the Weibull distribution effectively describes the accelerated failure process of natural pumice concrete under the influence of ice abrasion.The reliability curves of natural pumice concrete have a three-stage distribution that is monotonically decreasing,and its wear resistance degrades most noticeably in the accelerated damage stage.Among the two types of methods,the shape parameter values fluctuate most by the influence of the method,and at the early stage of reliability decline,the reliability life calculated by the least square estimation is smaller than that calculated by the best linear unbiased estimation method.The reliability life of na-tural pumice concrete under the reliability of 0.5 is selected as the life of natural pumice concrete under the action of ice wear,which will provide a theoretical reference for improving the wear resistance and safety of natural pumice concrete.
作者
王萧萧
高宇涛
荆磊
刘曙光
闫长旺
姜琳
WANG Xiaoxiao;GAO Yutao;JING Lei;LIU Shuguang;YAN Changwang;JIANG Lin(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot,Inner Mongolia 010051,China;Key Laboratory of Civil Engineering Structure and Mechanics,Inner Mongolia University of Technology,Hohhot,Inner Mongolia 010051,China;Inner Mongolia Engineering Research Center of Ecological Building Materials and Prefabricated Construction,Hohhot,Inner Mongolia 010051,China;School of Resources and Environmental Engineering,Inner Mongolia University of Technology,Hohhot,Inner Mongolia 010051,China)
出处
《排灌机械工程学报》
CSCD
北大核心
2023年第10期1015-1022,共8页
Journal of Drainage and Irrigation Machinery Engineering
基金
中央引导地方科技发展资金项目(2021ZY0024)
内蒙古自治区自然科学基金项目(2022MS05034)
内蒙古自治区科技计划项目(2022YFHH0153)
内蒙古自治区直属高校基本科研业务费项目(JY20220409,JY20220005)。
