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Method for determining the position of landslide slip-surface with a typical inclinometric curves

Journal of Mountain Science 2024年第2期21卷 413-432页

作者： CHEN Hao WU Hong-gang Ocean College Zhejiang UniversityZhoushan 316000China China Northwest Research Institute Co.Ltd.of CREC Lanzhou 730070China

In the actual monitoring of deep hole displacement,the identification of slip surfaces is primarily based on abrupt changes observed in the inclinometric *** conventional identification methods,inclinometric curves exhibiting indications of sliding can be categorized into three types:B-type,D-type,and *** position of the slip surface is typically determined by identifying the depth corresponding to the point of maximum displacement ***,this method is sensitive to the interval of measurement points and the observation scale of the coordinate axes and suffers from unclear sliding surfaces and uncertain *** on the variation characteristics of these diagonal curves,we classified the landslide into three components:the sliding body,the sliding interval,and the immobile ***,three different generalization models were established to analyze the relationships between the curve form and the slip surface location based on different physical indicators such as displacement rate,relative displacement,and *** results show that the displacement rate curves of an r-type slope exhibit a clustering feature in the sliding interval,and by solving for the depth of discrete points within the step phase,it is possible to determine the location of the slip *** the other hand,D-type slopes have inflection points in the relative displacement curve located at the slip *** acceleration curves of B-type slopes exhibit clustering characteristics during the sliding interval,while the scattered acceleration data demonstrate wandering ***,the slip surface location can be revealed by solving the depth corresponding to the maximum acceleration with cubic spline *** approach proposed in this paper was applied to the monitoring data of a landslide in Yunnan Province,*** results indicate that our approach can accurately identify the slip surface location and enable computability of its po

关键词： Inclinometric curve Slip-surface position displacement rate relative displacement Acceleration

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Analysis of stress and failure in rock specimens with closed and open flaws on the surface

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Frontiers of Structural and Civil Engineering 2021年第5期15卷 1222-1237页

作者： Amin MANOUCHEHRIAN Pinnaduwa H.S.W.KULATILAKE School of Resources and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

The influence of closed and open surface flaws on the stress distribution and failure in rock specimens is *** finite element models are developed to simulate the compression tests on flawed rock *** simulated specimens include those with closed flaws and those with open flaws on the *** analyses are conducted to investigate the influences of the flaw inclination,friction coefficient and the confining stress on failure *** results show significant differences in the stress,displacement,and failure behavior of the closed and open flaws when they are subjected to pure compression;however,their behaviors under shear and tensile loads are *** to the results,when compression is the dominant mode of stress applied to the flaw surface,an open flaw may play a destressing role in the rock and relocate the stress concentration and failure *** presented results in this article suggest that failure at the rock surface may be managed in a favorable manner by fabricating open flaws on the rock *** insights gained from this research can be helpful in managing failure at the boundaries of rock structures.

关键词： surface flaw heterogeneity circular hole numerical modeling relative displacement

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Nonlinear Modeling and Identification of Structural Joint by Response Control Vibration Test

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Transactions of Nanjing University of Aeronautics and Astronautics 2019年第6期36卷 964-976页

作者： LIU Xin WANG Lixiao CHEN Qidong SUN Beibei School of Mechanical Engineering Changshu Institute of TechnologyChangshu 215500P.R.China School of Mechanical Engineering Suzhou UniversitySuzhou 215000P.R.China School of Mechanical Engineering Southeast UniversityNanjing 210096P.R.China

Components of mechanical product are assembled by structural joints,such as bolting,riveting,welding,*** joints introduce nonlinearity to some engineering structures,and the nonlinearity need to be modeled *** meet serious quality requirements,it is necessary to detect and identify nonlinearity of mechanical products for structural *** test to acquire a dynamic response has been applied for decades,which provides reliable results for finite element(FE)model *** response control vibration test for identification of nonlinearity is presented.A nonlinear system can be regarded as linearity for particular steady state response,and classical linear analysis tool is applicable to extract modal data for particular ***,its applicability is illustrated by some numerical ***,it is implemented on experimental setup with structural joints by shaking *** stiffness and damping function dependent of relative displacement are fitted to describe its inherent *** spring and damping forces are identified by harmonic balance method(HBM)to predict output *** on the identified results,the procedure is recommended that it allows a reliable measurement of nonlinearity with a certain accuracy.

关键词： nonlinear identification shaking table response control vibration test relative displacement structural joint constant response

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