Numerical modeling on successive failure process of rock slopes caused by river erosion

2010 ◽  
pp. 1031-1036
Author(s):  
Jun Feng ◽  
Tao Yang ◽  
Zhongping Zhang ◽  
Honggang Wu
Keyword(s):  
Numerical Modeling ◽  
Failure Process ◽  
Rock Slopes ◽  
River Erosion

scholarly journals NUMERICAL MODELING AND FULL-SCALE EXPERIMENTS OF GLUED WOODEN STRUCTURES JOINT DESTRUCTION ON CARBON-FIBER DOWEL PINS

2020 ◽  
Vol 16 (2) ◽  
pp. 101-112
Author(s):  
Mikhail Vodiannikov ◽  
Galina Kashevarova ◽  
Danil Starobogatov
Keyword(s):  
Numerical Modeling ◽  
Structural Analysis ◽  
Carbon Fiber ◽  
Structural Parameters ◽  
General Structure ◽  
Failure Process ◽  
Joint Destruction ◽  
Field Tests ◽  
Full Scale ◽  
Glued Laminated Timber

This paper presents the results of numerical modeling and full-scale experiments of the failure process of a glued laminated timber beam with rigid joint in the middle. All the connecting parts are made of carbon fiber. The structural analysis is done with the finite element method (ANSYS software). The nonlinear problem was solved. The contact interaction of the structural elements in the process of deformation and fracture, as well as orthotropy of the wood, the transversely isotropic properties of the plates, and the real diagrams of the deformation of carbon fiber dowel pins were taken into account. The influence of the structural parameters of the joint on the position of the most loaded dowel pin in the joint and the bearing capacity of the general structure are investigated. To verify the structural analysis results, field tests were carried out before destruction by a stepwise increasing load on a personally designed stand. The destruction of the structure occurred according to the forecast of the numerical model as a result of the mutual slip of the glued wood layers and the destruction of the polymer matrix of the glued dowel pins with the beginning of the formation of plastic joints and the formation of cracks in the wood at the junction.

scholarly journals Failure of Rock Slopes With Intermittent Joints: Failure Process and Stability Calculation Models

2021 ◽  
Author(s):  
Zihan Zhou ◽  
Yanjun Shen ◽  
Zhonghui Chen
Keyword(s):  
Inclination Angle ◽  
Failure Process ◽  
Open Pit ◽  
Rock Slopes ◽  
Type B ◽  
Stability Calculation ◽  
Open Pit Mines ◽  
Type C ◽  
The Stability ◽  
Joint Inclination

Abstract Rock slopes with intermittent joints in open-pit mines are complex geological bodies composed of intact rock and discontinuous structural planes, and their stability analysis are necessary for mine disaster prevention. In this study, a series of base friction tests were performed to determine the failure process and displacement field evolution of rock slopes with intermittent joints using the speckle technique of a noncontact measurement system. Next, stability calculation models of the slopes were established from the energy perspective using the plastic limit analysis theory, and the effects of the joint inclination angle and coalescence coefficient of rock bridges on the slope stability were evaluated. The four main conclusions are as follows. (1) The failure of rock slopes with intermittent joints shows the feature of collapse-lower traction-upper push. (2) Based on the failure modes of rock bridges in slopes, the failure of rock slopes with intermittent joints could be divided into three types: tensile coalescence (Type A), shear coalescence (Type B), and tensile–shear coalescence (Type C). (3) Among the three slope types, the stability of the Type A slope is significantly influenced by rock cohesion, whereas that the Type B slope is significantly influenced by joint cohesion. The stability of the Type C slope is significantly influenced by the joint inclination angle and joint friction angle. (4) The local-stable slope is unstable while the first through-tensile crack in the zone of the potential sliding body higher than the critical instability height appeared. This study guides the stability evaluation and instability prediction of jointed rock slopes in open-pit mines.

Failure process of rock slopes with cracks based on the fracture mechanics method

2017 ◽  
Vol 231 ◽  
pp. 190-199 ◽  
Author(s):  
Wei Gao ◽  
Shuang Dai ◽  
Ting Xiao ◽  
Tianyang He
Keyword(s):  
Fracture Mechanics ◽  
Failure Process ◽  
Rock Slopes

scholarly journals Numerical Investigation on Dynamic Response and Failure Modes of Rock Slopes with Weak Interlayers Using Continuum-Discontinuum Element Method

2021 ◽  
Vol 9 ◽  
Author(s):  
Chengwen Wang ◽  
Xiaoli Liu ◽  
Danqing Song ◽  
Enzhi Wang ◽  
Jianmin Zhang
Keyword(s):  
Dynamic Response ◽  
Failure Modes ◽  
Failure Process ◽  
Amplification Coefficient ◽  
Rock Slopes ◽  
Earthquake Excitation ◽  
Good Correspondence ◽  
Response Characteristics ◽  
Damage Degree ◽  
Element Method

In order to better understand the dynamic response and failure modes of rock slopes containing weak interlayers subjected to earthquake excitation, a series of numerical simulations were carried out using the continuum-discontinuum element method (CDEM), considering the influence of seismic amplitude and weak interlayers inclination. The seismic response characteristics of slopes were systematically analyzed according to the waveform characteristics, amplification effect, equivalent crack ratio, etc. The numerical results show that the acceleration waveform characteristics and peak ground displacement (PGD) amplification coefficient have good correspondence with the dynamic failure process of landslides. Comprehensive analysis of waveform characteristics and PGD amplification coefficient can determine the damage time, damage location, and damage degree of landslides. The landslide process can be divided into three stages according to the equivalent crack ratio: rapid generation of a large number of microcracks, expansion and aggregation of microcracks, and penetration of micro-cracks and the formation of slip surfaces. The equivalent crack ratio provides a new idea for evaluating slope stability. In addition, under the combination of different amplitudes and weak interlayers, these earthquake-induced landslides exhibit different failure modes: the failure of the gentle-dip slope is mainly local rockfall; The mid-dip and steep-dip slopes with small amplitudes experience “tensile cracking-slip-collapsing” failure; The steep-dip slopes under strong earthquake failed in the form of “tensile cracking-slip-slope extrusion-collapsing”. The research results are of great significance for a deeper understanding of the formation mechanism of rock landslides with weak interlayers and the prevention of such landslide disasters.

Numerical Simulation of Fracture Propagation of Heterogeneous Material

2012 ◽  
Vol 170-173 ◽  
pp. 581-584 ◽  
Author(s):  
Ze Qi Zhu ◽  
Qian Sheng ◽  
Xiao Dong Fu
Keyword(s):  
Image Processing ◽  
Numerical Modeling ◽  
Finite Difference ◽  
Failure Process ◽  
Heterogeneous Material ◽  
Modeling Method ◽  
Uniaxial Compression Test ◽  
Fuzzy Clustering Method ◽  
Heterogeneous Rock ◽  
Mineral Components

For the Three Gorges granite, a finite difference software package FLAC was used to study failure process of heterogeneous rock material. Based on mineral components identification results of the granite and fuzzy clustering method, the actual image date was transformed into the finite difference grid by applying image processing techniques. A convenient and efficient two-dimensional numerical modeling method for heterogeneous geomaterials was presented. Then, failure process of the granite were simulated in uniaxial compression test based on experimental strain soft model, and the stress concentration phenomenon was analyzed. The results show that the numerical modeling method based on digital image processing can be used to calculate the mechanical responses of geomaterials by taking their heterogeneities into considerations.

scholarly journals Investigating the Failure Mechanism of Jointed Rock Slopes Based on Discrete Element Method

2020 ◽  
Vol 2020 ◽  
pp. 1-19
Author(s):  
Chao Peng ◽  
Qifeng Guo ◽  
Zhenxiong Yan ◽  
Minglong Wang ◽  
Jiliang Pan
Keyword(s):  
Rock Mass ◽  
Failure Mechanism ◽  
Failure Process ◽  
Structural Complexity ◽  
Jointed Rock ◽  
Research Area ◽  
Open Pit ◽  
Particle Model ◽  
Rock Slopes ◽  
Synthetic Rock

This paper presents a comprehensive engineering method to investigate the failure mechanism of the jointed rock slopes. The field geology survey is first carried out to obtain the slope joint data. A joint network model considering the structural complexity of rock mass is generated in the PFC software. The synthetic rock mass (SRM) approach for simulating the mechanical behavior of jointed rock mass is employed, in which the flat-jointed bonded-particle model (FJM) and smooth joint contact model (SJM) represent intact rock and joints, respectively. Subsequently, the effect of microparameters on macromechanical properties of rock is investigated for parameter calibration. Moreover, the scale effect is analyzed by multiscale numerical tests, and the representative elementary volume (REV) size in the selected research area is found as 16 m × 16  m × 16 m. The microparameters of the SRM model are calibrated to match the mechanical properties of the engineering rock mass. Finally, an engineering case from Shuichang open-pit mine is analyzed and the failure process of the slope during the excavation process from micro- to macroscale is obtained. It has been found that failure occurs at the bottom of the slope and gradually develops upwards. The overall failure of the slope is dominated by the shallow local tension fracture and wedge failure.

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