检索结果-南通市图书馆

Creeping reservoir landslide progressive evolution process: from large-scale direct shear creep test to seepage-mechanical-deformation block model

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2025年

作者： Jiefei Zhang Shu Zhang huiming tang Qingbing Liu Qiang Li Huan Zhang Faculty of Engineering， China University of Geosciences Badong National Observation and Research Station of Geohazards， China University of Geosciences

Creeping reservoir landslides experience slow， ongoing deformation driven by cyclical hydrological conditions， posing a significant threat to hydropower infrastructure and nearby communities. Long-term high consolidation pressure leads to the formation of a dense soil matrix unique structure in slip zone soils， significantly affecting the reservoir landslides evolution. However， current studies often fail to adequately describe and incorporate the structural and creep properties of intact slip zone soils， results in a lack of precision and efficiency when simulating the progressive evolution process of creeping reservoir landslides. This study conducted a series of large-scale direct shear creep test in the intact slip zone soil from No.1 Linjiang landslide of Huangtupo landslide in Three Gorges Reservoir area (TGRA)， to study the creep behavior and long-term strength. Subsequently， a seepage-mechanical-deformation (SMD) block model， offering higher computational efficiency and the ability to dynamically adapt to real-time hydrological boundary conditions， was developed to provide an ovel framework for simulating the progressive evolution of the No.1 Linjiang landslide. The experimental results indicate that that the intact slip zone soil exhibits distinct creep behavior characteristics and has obtained long-term strength. The performance of the proposed SMD block model is further validated by its close alignment with monitoring data， with root-mean-square errors (RMSE) of 2.556 mm and 1.167 mm for the rear and front monitoring points of the landslide， respectively， over one hydrological year. Furthermore， the simulation results highlight that the primary deformations occur at the front and rear of the landslide， with the middle section acting as an anti-sliding barrier. Overall， this study advances the understanding of creeping landslide evolution processes and enhances the simulation capabilities of landslide deformation， offering valuable insights for risk assess

关键词：

Quantitative Evaluation of Rock Brittle Property Based on Energy Evolution and Its Application in Three Gorges Reservoir Area

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年第6期35卷 2013-2029页

作者： Tao Wen Yankun Wang huiming tang School of Geosciences Hubei Key Laboratory of Complex Shale Oil and Gas Geology and Development in Southern ChinaYangtze UniversityWuhan430100China Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan430074China Anhui Institute of Intelligent Underground Detection Technology Hefei230601China

Brittleness is of great significance for evaluating the mechanical properties of the slope rock in reservoir area and revealing the brittle failure mechanism of the *** a series of definitions of the brittleness and evaluation methods of brittleness index have been proposed,there is still lack of a widely recognized and remarkable standards in these aspects due to the differences in diagenetic process,depositional environment and mineral *** previous methods to quantitively estimate the rock brittleness based on energy balance analysis are summarized,which neglect multiple influencing factors of the rock brittleness,such as the weight of pre-peak or post-peak mechanical behaviors on the prediction performance of the brittleness *** on the typical curves about stress and strain,the relationships between the brittle failure behaviors and the energy evolutions are comprehensively analyzed,then a new method for assessing the brittleness is *** on prepeak brittleness index to represent brittle property at pre-peak stage and post-peak brittleness index to determine brittle characteristic at post-peak stage,a new brittleness index is established by additive synthesis method in consideration of the weight of brittleness indexes before and after peak strength,and either of the two brittleness indexes can be punished or compensated by setting different parameter *** results indicate that the proposed brittleness index can represent the brittle change laws for different rock types whenα≤0.5,β≥*** evaluating the brittleness of the slope rock in Three Gorges Reservoir(TGR)area,the results show that the rock brittleness in the slope affects the stability of the ***,the novel evaluation method can provide reliable results,and the proposed brittleness index considering the energy evolution can be applied to assess the brittle property in the reservoir bank project.

关键词： rocks brittleness index complete stress-strain curve deformation and failure energy evolution slope stability engineering geology

Surface Microtextures of Slipping Zone Soil of Some Landslides in the Three Gorges Reservoir District and Their Significance

在线全文

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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.