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Acta Geologica Sinica(English Edition) 2000年第2期74卷 349-352页

作者： YAN Chunjie SUN Yunzhi tang huiming Test Centre China University of Geosciences Wuhan 430074 Hubei Institute of Yangtze River Exploring Technique Ministry of Water Resources Wuhan 430011 Hubei 3Yan Chunjie Male born in 1963. He got a master degree for mineralogy in 1991. Now he is a senior engineer with the Test Centre of China University of Geosciences and devotes himself to the study of geologic disasters and modern testing techniques and teaching work. E-mail: ChjYan@***.

The mineral assemblage and content and surface microtextures of slipping zone soil of several landslides in the Three Gorges Reservoir District have been analyzed using the scanning electron microscope (SEM) and X-ray diffractometer (XRD). All the mineral assemblages are similar in these landslides. The main minerals are montmorillonite, illite, kaolinite, chlorite, quartz and feldspar. There are two kinds of surface microtexture in the slipping zone soil, i.e., linear scratches and arcuate scratches. Based on analyses of the changes of the microtextures, one can obtain information about the number, directions and stages of landslide movements. The authors have also studied the mechanism of landslide formation, evaluated the stability of landslides and revival possibility of ancient landslides and forecasted the activity of similar landslides in different districts. The surface microtexture features of stable landslides and mobile landslides are summarized and it is concluded that the existence of filamentous bacteria may result in or increase movements of landslides.

关键词： The Three Gorges Reservoir district landslide surface microtexture scanning electron microscope (SEM)

Study on Geomechanical and Physical Models of Necking-Type Slopes

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Journal of Earth Science 2023年第3期34卷 924-934页

作者： Kun Fang huiming tang Jichen Zhu Zijin Fu Pengju An Bocheng Zhang Chunyan tang Faculty of Engineering China University of GeosciencesWuhan 430074China

A simplified geomechanical model was proposed by considering three typical neckingtype slopes;this model lays a foundation for the further investigation of the deformation behaviors of such *** physical models of necking-type slopes were built according to the geomechanical model with slope evolution ***,preliminary calculations related to the arching effect in the physical model were *** evolution stages of necking-type slopes,namely,the initial stage,compression stage,and failure stage,were presented based on the formation and disappearance of the arching effect within the *** specific parameters of the geomechanical model were *** the setup of the tilting test,the failure angle of the necking-type slope model was calculated to be approximately 50°with a large lateral resistance *** proposed geomechanical model and physical models of necking-type slopes provide guidance for the establishment of geomechanical and physical models of landslides at specific sites.

关键词： geomechanical model physical model necking-type slope slope stability arching effect

Weight Analysis of Impact Factors of Interbedded Anti-Inclined Slopes Block-Flexure Toppling Based on Support Vector Regression

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Journal of Earth Science 2024年第2期35卷 568-582页

作者： Bocheng Zhang huiming tang Yibing Ning Kun Fang Ding Xia Department of Engineering Geology and Geotechnical Engineering Faculty of EngineeringChina University of GeosciencesWuhan430074China Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan430074China College of Geological Engineering and Geomatics Chang’an UniversityXi’an710054China

Block-flexure toppling failure is frequently encountered in interbedded anti-inclined rock(IAR)slopes,and seriously threatens the construction of hydropower *** this study,we first investigated the Lean Reservoir area’s geological setting and the Linda landslide’s ***,uniform design and random design were used to design 110 training datasets and 31 testing datasets,***,the toppling response was obtained by using the discrete element ***,support vector regression was used to obtain the influence weights of 21 impact *** results show that the influence weight of the slope angle and rock formation dip angle on the toppling deformation among tertiary impact factors is 25.96%and 17.28%,respectively,which are much greater than the other 19 impact factors within the research *** the primary impact factors,the influence weight is sorted from large to small as slope geometry parameters,joints parameters,and rock mechanics *** parameters,especially the geometric parameters,cannot be ignored when evaluating the stability of IAR *** numerical simulation,it was qualitatively determined that failure surfaces of slopes were controlled by cross joints and that the rocks in the slope toe play a role in preventing slope deformation.

关键词： interbedded anti-inclined slopes block-flexure toppling impact factors numerical simulation support vector regression engineering geology

A Predictive,Two-Parameter Model for the Movement of Reservoir Landslides

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Journal of Earth Science 2020年第6期31卷 1051-1057页

作者： Robert E.Criss Wenmin Yao Changdong Li huiming tang Department of Earth and Planetary Sciences Washington UniversitySt.Louis MO 63130USA Faculty of Engineering China University of GeosciencesWuhan 430074China

Monitoring data show that many landslides in the Three Gorges region,China,undergo step-like displacements in response to the managed,quasi-sinusoidal annual variations in reservoir *** behavior is consistent with motion initiating when the reservoir water level falls below a critical level that is intrinsic to each landslide,with the subsequent displacement rate of the landslide being proportional to the water depth below that critical *** motion terminates when the water level rises back above the critical level,so the annual step size is the time integral of the instantaneous displacement *** responses are incorporated into a differential equation that is easily calibrated with monitoring data,allowing prediction of landslide movement from actual or anticipated reservoir level *** successes include(1)initiation and termination of the annual sliding steps at the critical reservoir level,producing a series of steps;(2)prediction of variable step size,year to year;and(3)approximate prediction of the shape and size of each annual *** rainfall correlates poorly with step size,probably because its effect on groundwater levels is dwarfed by the 30 m annual variations in the level of the Three Gorges *** landslide behavior is suggested.

关键词： reservoir landslide parsimonious model step-like displacement displacement prediction critical reservoir level

Geometry and Maximum Width of a Stable Slope Considering the Arching Effect

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Journal of Earth Science 2020年第6期31卷 1087-1096页

作者： Kun Fang huiming tang Xuexue Su Wentao Shang Shenglong Jia Faculty of Engineering China University of GeosciencesWuhan 430074China School of Civil Engineering Shandong Jianzhu UniversityJinan 250101China Faculty of Engineering University of AlbertaEdmonton ABT6G2R3Canada

The stability of an arching slope in deformable materials above strong rocks strongly depends on the shape and width of the *** for a free surface problem that incorporate these two parameters were derived using a simplified two-dimensional arching slope model,and were validated using physical model tests under 1 g and centrifugal *** results are used to estimate the maximum excavation width for a weak claystone slope in a lignite mine,for which we calculate a safety factor of 1.31.

关键词： slope failure geological engineering cracked soil slope large-scale model test deformation mechanism arching slope

An Analysis for Cross Beam-Ground Anchor Reinforcement

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Journal of China University of Geosciences 2005年第3期16卷 271-276页

作者： Xu Yingzi Zhang Baiqing tang huiming School of Naval Architecture Ocean and Civil Engineering Shanghai J iaotong University Shanghai 200030 China Engineering Faculty China University of Geosciences Wuhan 430074 China Huangshi Government Huangshi 435003 China

With the rapid development of water facilities, hydroelectric projects, highways and railways in China, beam-anchor reinforcement has been widely used to stabiliZe slopes in recent years. But the theory for the design of beam-anchor reinforcement is far behind the application. Cross beam-ground anchor reinforcement is a combination of beams and anchors forming a new structure to prevent slope sliding. The forces in the beams are discussed using theoretical analysis and numerical modeling. The Winkler model is used to analyze the beams, and reasonable values of λ, length, spacing and cantilevered length for the beams are determined through a theoretical analysis. A three-dimensional finite element method is adopted to model the interaction of the beams and soils and a structure analysis is applied to treat the beams and to study the stress distribution in external and internal beams. The analytical results show that it is better to satisfy λ≥2π, the spacing between anchors ls should be lsλ〈π/2 and cantilever length should be （0.3-0.5）ls for the optimum design. The numerical results show that the same design can be used for all beams in different directions, including the internal and external beams. The application of the analytical method for reinforcement beam analysis is acceptable. It is better to choose a safety coefficient of 1.3 for design based on the analytical method for safety.

关键词： beam-anchor reinforcement slope mechanism beam analytical method finite element modeling

Dynamic Stability Analysis of Wedge in Rock Slope Based on Kinetic Vector Method

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Journal of Earth Science 2014年第4期25卷 749-756页

作者： Weida Ni huiming tang Xiao Liu Rui Yong Zongxing Zou Faculty of Engineering China University of Geosciences Three Gorges Research Center for Geo-hazard Ministry of Education China University of Geosciences

A new method （kinetic vector method, KVM） is presented for analyzing the dynamic stability of wedge in rock slope. The dynamic analysis is carried out based on three dimensional distinct element code （3DEC）, and the kinetic inertial force of the wedge under seismic loading can be obtained via calculating the net vectorial nodal force of the finite difference grid. Then, the factor of safety （FOS） of the wedge can be calculated based on limit equilibrium method （LEM） at each dynamic analysis step, therefore time series of the FOS for whole earthquake process can be obtained. For the purpose of evaluating the entire dynamic stability of the wedge, dynamic factor of safety （DFOS） is proposed and defined as a numerical value corresponding with a given rate of probability guarantee based on reliability theory. Consequently, the KVM inherits the merits of the LEM and also has fully nonlinear dynamic analysis capabilities, and the feasibility and correctness of the KVM are tested by an example given by Hoek and Bray （1981）. Finally, a rock slope case in Wenchuan Earthquake regions of China is presented to verify the engineering practicability of the KVM, and the results matched the actual situation well.

关键词： dynamic stability limit equilibrium discrete element kinetic vector method rock slope Wenchuan Earthquake.

Centrifuge modelling of landslides and landslide hazard mitigation:A review

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Geoscience Frontiers 2023年第1期14卷 372-401页

作者： Kun Fang huiming tang Changdong Li Xuexue Su Pengju An Sixuan Sun Faculty of Engineering China University of GeosciencesWuhan 430074China Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan 430074China

Landslides are serious geohazards that occur under a variety of climatic conditions and can cause many casualties and significant economic *** modelling,as a representative type of physical modelling,provides a realistic simulation of the stress level in a small-scale model and has been applied over the last 50 years to develop a better understanding of *** recent developments in this technology,the application of centrifuge modelling in landslide science has significantly ***,we present an overview of physical models that can capture landslide processes during centrifuge *** review focuses on(i)the experimental principles and considerations,(ii)landslide models subjected to various triggering factors,including centrifugal acceleration,rainfall,earthquakes,water level changes,thawing permafrost,excavation,external loading and miscellaneous conditions,and(iii)different methods for mitigating landslides modelled in centrifuge,such as the application of nails,piles,geotextiles,vegetation,*** behaviors of all the centrifuge models are discussed,with emphasis on the deformation and failure mechanisms and experimental *** on this review,we provide a best-practice methodology for preparing a centrifuge landslide test and propose further efforts in terms of the seven aspects of model materials,testing design and equipment,measurement methods,scaling laws,full-scale test applications,landslide early warning,and 3D modelling to better understand the complex behaviour of landslides.

关键词： Centrifuge test Landslide Slope stability Scaling law Mitigation strategy

A Constitutive Model of Granite Shear Creep under Moisture

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Journal of Earth Science 2016年第4期27卷 677-685页

作者： Xingang Wang Bin Hu huiming tang Xinli Hu Jiading Wang Lei Huang State Key Laboratory of Continental Dynamics Department of Geology Northwest University Faculty of Engineering China University of Geosciences

Previous constitutive models of granite shear creep have two limitations：（1） although moisture greatly affects granite shear creep behavior, currently there are no constitutive models that include this factor;（2） there are also no models that include an acceleration stage. This paper presents an improved Burgers constitutive model with the addition of a damage parameter to characterize the moisture effect and uses a nonlinear relation equation between stress and strain for inclusion as the acceleration stage. The damage parameter is determined from granite creep experiment under four different moisture contents（0%, 0.22%, 0.49%, and 0.79%）. The nonlinear relation equation is obtained by fitting a dataset of stain versus time under five different loading stages. To verify the presented model, a creep experiment was conducted on other granite samples and the results show that the model agrees well with the experimental observation data.

关键词： moisture state shear creep constitutive model Burgers model damage variable,nonlinear visco-elasto-plastic three-dimensional creep constitutive equation.

Mechanism, behaviour and application of iron nitrate modified carbon nanotube composites for the adsorption of arsenic in aqueous solutions

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Chinese Journal of Chemical Engineering 2023年第8期60卷 26-36页

作者： Yingli Li Zhishuncheng Li Guangfei Qu Rui Li Shuaiyu Liang Junhong Zhou Wei Ji huiming tang Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China National Regional Engineering Research Center-NCW Kunming 650500China

In this study,ferric nitrate modified carbon nanotube composites (FCNT) were prepared by isovolumetric impregnation using carbon nanotubes (CNTs) as the carrier and ferric nitrates the active *** batch experiments showed that FCNT could effectively oxidize As(III) to As(V) and react with it to form stable iron arsenate *** the dosage of FCNT was 0.1 g·L^(–1),pH value was 5–6,reaction temperature was 35℃ and reaction time was 2 h,the best arsenic removal effect could be achieved,and the removal rate of As(V) could reach 99.1%,which was always higher than 90%under acidic *** adsorption results of FCNT were found to be consistent with Langmuir adsorption by static adsorption isotherm fitting,and the maximum adsorption capacity reached 118.3 mg·g^(-1).The material phase and property analysis by scanning electron microscopy,Brunauer–Emmett–Teller,Fourier transform infrared spectoscopy,X-ray photoelectron spectroscopy and other characterization methods,as well as adsorption isotherm modeling,were used to explore the adsorption mechanism of FCNT on *** was found that FCNT has microporous structure and nanostructure,and iron nanoparticles are loosely distributed on CNTs,which makes the material have good oxidation,adsorption and magnetic separation *** migrates on the surface of FCNT composites is mainly removed by forming insoluble compounds and *** the results show that FCNT treats arsenic at low cost with high adsorption efficiency,and the results also provide the experimental data basis and theoretical basis for arsenic contamination in groundwater.

关键词： Carbon nanotubes As(V) Adsorption Nanocomposites Impregnation method