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On-line diagnosis method of crack behavior abnormality in concrete dams based on fluctuation of sequential parameter estimates

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Science China(Technological Sciences) 2015年第3期58卷 415-424页

作者： LI ZhanChao GU ChongShi WANG ZhengZhong WU ZhongRu College of Water Resources and Architectural Engineering Northwest A&F University State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University College of Water Conservancy and Hydropower Engineering Hohai University

Research on on-line diagnosis method of crack behavior abnormality in concrete dams can provide support for timely grasping abnormality state of the crack itself and achieving real-time monitoring of the dam *** that samples of crack effects in concrete dams increase actually over monitoring time,a superiority criterion for the on-line diagnosis is determined so as to detect the abnormality moments timely and *** integrating the safety monitoring statistical model of crack effect variable with change point theory,a fluctuation method of regression coefficients is established for the on-line *** addition,each abnormality moment is detected by the cumulative sum of regression model *** indicate that abnormality of crack behavior in concrete dams can be characterized by structural instability of crack monitoring *** causes of crack behavior abnormality can be analyzed by the established method,which will play an important role in dam safety ***,taking the crack in a concrete gravity-arch dam as an example,the scientific rationality and validity of the established on-line diagnosis method are confirmed.

关键词： concrete dams crack behavior abnormality on-line diagnosis fluctuation of regression coefficients

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维普期刊数据库

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cracking behaviors and strength of rock-like samples with steps of different geometries under shear stress

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Journal of Mountain Science 2021年第5期18卷 1352-1370页

作者： LE Hui-lin WEI Ji-hong SUN Shao-rui ZHANG Chu-chu Department of Geology Engineering Hohai UniversityNanjing 210098China China Energy Engineering Group Jiangsu Power Design Institute Co. Ltd.Nanjing 210098China

Steps are distinctive features for estimating the movement of the upper and lower block of ***,studies about the influence of steps as a special type of discontinuity on cracking behaviors and strength of rock masses are *** this research,rock-like samples with steps and preexisting flaws were *** height h and the inclination angle of gentle slope of the stepαwere set to different *** shear tests were conducted on these samples under different normal *** experimental results reveal that the inclination angle of the gentle slope of the stepα,step height h,and normal stress have an influence on the strength,crack initiation,and crack propagation of the *** experimental results show that crack behaviors and shear strength were affected by step inclination anglesαand step height *** the normal stress increases,the improvement of the strength of samples with a large step height is larger than that of samples with a small step height,the improvement of the strength of samples withαof 10°is larger than that of samples withαof 0°and-10°.The discrete element method was used to simulate the shear *** results show five different types of displacement vectors,which can be used to determine whether the cracks are tensile cracks or shear *** above conclusions can provide help for estimating mechanical properties and failure modes of rock masses with steps of different geometries.

关键词： Step Preexisting flaw Direct shear test crack behavior Shear stress Numerical test

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维普期刊数据库

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Mechanical properties and cracking behaviors of limestone-like samples with two parallel fissures before and after grouting

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Journal of Central South University 2021年第9期28卷 2875-2889页

作者： LE Hui-lin WEI Ji-hong SUN Shao-rui WANG Wu-chao FAN Hao-tian School of Earth Science and Engineering Hohai UniversityNanjing 210098China

In the present work,uniaxial compressive tests were carried out on limestone-like samples containing two parallel open fissures or cement-infilled fissures with different *** property and crack behavior of limestone-like samples with two parallel open fissures or cement-infilled fissures were affected by bridge inclination angle and fissure inclination *** types of coalescence of rock bridge for samples containing open fissures or cement-infilled fissures were summarized and *** closure of tensile crack was observed in the samples with small fissure inclination *** is a new phenomenon which is not mentioned in previous *** results show that the peak strength,crack initiation stress,and coalescence type are different between open fissures and cement infilled *** reason for this phenomenon is that grouting of cement can transfer stress and reduce stress concentration at the flaw tip and rock bridge area.

关键词： cement-infilled fissure crack behavior compressive strength coalescence type

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