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A method to determine relevant geomechanical parameters for evaluating the hydraulic erodibility of rock

Journal of Rock Mechanics and Geotechnical Engineering 2019年第5期11卷 1004-1018页

作者： Lamine Boumaiza Ali Saeidi Marco Quirion Département des Sciences appliquées Universitédu QuébecàChicoutimiChicoutimiG7H 2B1Canada Expertise en barrages Direction Barrages et infrastructuresHydro-QuébecMontréalH2Z 1A4Canada

Among the methods used for evaluating the potential hydraulic erodibility of rock,the most common methods are those based on the correlation between the force of flowing water and the capacity of a rock to resist erosion,such as Annandale’s and Pells’*** capacity of a rock to resist erosion is evaluated based on erodibility indices that are determined from specific geomechanical parameters of a rock *** indices include unconfined compressive strength(UCS)of rock,rock block size,joint shear strength,a block’s shape and orientation relative to the direction of flow,joint openings,and the nature of the surface to be potentially ***,it is difficult to determine the relevant geomechanical parameters for evaluating the hydraulic erodibility of *** assessment of eroded unlined spillways of dams has shown that the capacity of a rock to resist erosion is not accurately *** more than 100 case studies,we develop a method to determine the relevant geomechanical parameters for evaluating the hydraulic erodibility of rock in unlined *** UCS of rock is found not to be a relevant parameter for evaluating the hydraulic erodibility of *** the other hand,we find that the use of three-dimensional(3D)block volume measurements,instead of the block size factor used in Annandale’s method,improves the rock block size ***,the parameter representing the effect of a rock block’s shape and orientation relative to the direction of flow,as considered in Pells’method,is more accurate than the parameter adopted by Annandale’s method.

关键词： Rock mass Hydraulic erodibility geomechanical parameters Rock block size Annandale’s method Pells’method Kirsten’s index Erosion level

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Experimental study on the geomechanical properties and failure behaviour of interbedded shale during SAGD operation

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Petroleum Research 2020年第4期5卷 277-288页

作者： Shengfei Zhang Xiuluan Li Hongzhuang Wang PetroChina Research Institute of Petroleum Exploration and Development Beijing100083China

Interbedded shale(IBS)impedes the development of a steam chamber and poses a serious threat to the success of any steam-assisted gravity drainage(SAGD)operation in a heavy-oil *** up IBS has been a continual challenge for the *** study summarizes experimental studies on the geomechanical properties and failure behaviour of IBS during thermal *** cores were collected by means of fully sealed coring in northwestern *** composition analysis,porosity,and permeability measurement,as well as imbibition tests,were initiated to evaluate the potential of ***,shear failure behaviour was studied through triaxial compression ***,pore structure and failure processes of IBS were investigated through thermal stimulation *** IBS was considered as the *** porosity was approximately 7%and permeability was approximately 100 nD while in-situ stress was *** IBS contained conside rable smectite components,it didn't disintegrate under *** ***,shear failure behaviour of IBS was observed by computer tomography(CT)scanning when IBS was heated up to 180°C under constant radial confining pressure and axial constraint of *** imbibition causes disintegration of IBS,it is unlikely when under in-situ stress ***,shear failure can be achieved under uniaxial boundary conditions with rapid heating.

关键词： Interbedded shale geomechanical Thermal loading CT scanning SAGD

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Introduction of geomechanical restoration method and its implications for reservoir assessment of unconventional oil-gas resource in China

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Chinese Journal of Population,Resources and Environment 2013年第4期11卷 327-332页

作者： Lining wang Research Institute of Petroleum Exploration and Development School of Earth and Space Sciences Peking University

New technologies are in urgent need of unconventional hydrocarbon exploration and development in *** paper provides a brief introduction and analysis of a new three-dimensional(3D)geomechanical restoration method developed in recent *** an in-depth discussion on the technical principle and specific characteristics of the fields,we designed a feasible workflow for two oil-gas fields with great unconventional oil-gas resource potentials in China(Weiyuan and Jiulongshan oil-gas fields of Sichuan).After discussing the major challenges and limitations of the new technology,we also suggest its research efforts and future application prospect It is shown that the new technology will be an effective method to facilitate the exploration and development of unconventional oil and gas resources in China.

关键词： geomechanical restoration reservoir prediction unconventional oil-gas resources new workflow

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geomechanical Modeling of Stress and Fracture Distribution during Contractional Fault-Related Folding

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Journal of Geoscience and Environment Protection 2017年第11期5卷 61-93页

作者： Jianwei Feng Kaikai Gu School of Geosciences China University of Petroleum Qingdao China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and Technology Qingdao China

Understanding and predicting the distribution of fractures in the deep tight sandstone reservoir are important for both gas exploration and exploitation activities in Kuqa Depression. We analyzed the characteristics of regional structural evolution and paleotectonic stress setting based on acoustic emission tests and structural feature analysis. Several suites of geomechanical models and experiments were developed to analyze how the geological factors influenced and controlled the development and distribution of fractures during folding. The multilayer model used elasto-plastic finite element method to capture the stress variations and slip along bedding surfaces, and allowed large deformation. The simulated results demonstrate that this novel Quasi-Binary Method coupling composite failure criterion and geomechanical model can effectively quantitatively predict the developed area of fracture parameters in fault-related folds. High-density regions of fractures are mainly located in the fold limbs during initial folding stage, then gradually migrate from forelimb to backlimb, from limbs to hinge, from deep to shallow along with the fold uplift. Among these factors, the fold uplift and slip displacement along fault have the most important influence on distributions of fractures and stress field, meanwhile the lithology and distance to fault have also has certain influences. When the uplift height exceeds approximately 55 percent of the total height of fold the facture density reaches a peak, which conforms to typical top-graben fold type with large amplitude and high-density factures in the top. The overall simulated results match well with core observation and FMI results both in the whole geometry and fracture distribution.

关键词： Kuqa Depression Deep Tight Sandstone Fault-Propagation Fold geomechanical Model Fractures Prediction

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Geotechnical Behavior of Eastern Senegal Rock Mass Slopes by geomechanical Classifications and Applications

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Journal of Geoscience and Environment Protection 2018年第5期6卷 11-24页

作者： Déthié Sarr Mathioro Fall Oustasse A. Sall Papa Malick Ngom Yves Berthaud UFR of Engineering Sciences University of Thiès Thiès Senegal Department of Geology University Cheikh Anta Diop of Dakar Dakar Senegal Faculty of Engineering University Pierre et Marie Curie Paris France

In Senegal, rock mechanic studies began in last four years and were a very new engineering domain. So, the first stage is to characterize geological materials. It is on this way that this work is done. This paper analyzes geomechanical parameters of sandstones of Dindifélo and basalt of Bafoundou belonging to the Proterozoic rocks domain of eastern Senegal. By Rock Mass Rating (RMR) and Geological Strength Index (GSI), sandstones of the Dindifello Cliff show fair to poor characteristics while basalts of the hills of Bafoundou are fair quality. In addition to the qualities of rock mass, Young moduli, uniaxial compressive strengths and tensile strength of rock mass are also defined using Rock Quality Designation (RQD) GSI, RMR. Hoek-Brown parameters m and a, depend both on the fracturation and the content fine in the rock. Values of mechanical parameters are different when deduced from RMR, GSI and from intact rock laboratory test. Those differences are due to variables taken account. The variation depends also on the quality of the rock. Statistical analysis shows possible unstabilities which depend on rock mass parameters but with acceptable probability of failure. Probability of failure is the highest when deducing from Mohr criterion than from Hoek-Brown criterion.

关键词： geomechanical Classifications Sandstones Basalt Dindifélo Mako

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Monitoring of ground subsidence movements over territory of mines being flooded in Budyonnovsky and Proletarsky districts in Donetsk city with help of GPS-technology

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中国有色金属学会会刊：英文版 2005年第S1期15卷 266-268页

作者： A.V. Antsiferov Y.N. Gavrilenko N.N. Kiselyov UkrNIMI NAS Ukraine Donetsk 83121 UkraineDonetsk National Technical University Donetsk 83000 UkraineUkrNIMI NAS Ukraine Donetsk 83121 Ukraine

This paper considers the processes of activation in ground subsidence movements in flooding mine workings of mines being liquidated in two districts in Donetsk city on the area of more than 60km^2. A concept is given to build up control network of geomechanical monitoring in conditions of existing old mining operations at shallow depths (down to 100m), strong damages of objects of urban building. Given are GPS network structure, layouts for location of basic and local profile lines, special control stations for monitoring ground subsidence movements over the territory of mines being flooded. Results of the series of observations made are discussed and their accuracy is analyzed.

关键词： ground surface movement activation GPS network geomechanical monitoring mine

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Thermo-hydro-mechanical modeling of fault discontinuities using zero-thickness interface element

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第1期12卷 74-88页

作者： Ali Ranjbar Hossein Hassani Kourosh Shahriar Mohammad Javad Ameri Shahrabi Department of Petroleum Engineering Amirkabir University of TechnologyTehranIran Department of Mining and Metallurgy Engineering Amirkabir University of TechnologyTehranIran

In this paper,a coupled thermo-hydro-mechanical(THM)simulation in a faulted deformable porous medium is *** model involves solving the mass conservation,linear momentum balance,and energy balance equations which are derived from the Biot’s consolidation *** pore pressure,solid displacement,and temperature are chosen as initial variables in these equations,and the finite element method in combination with the interface element is used for spatial discretization of continuous and discontinuities(fault)parts of the medium to solve the *** main purpose of this study is providing precise formulations,applicability,and ability of the triple-node zero-thickness interface element in THM modeling of *** should be noted that the system of equations is solved using a computer code written in Matlab *** order to verify the developed method,simulations of index problems such as Mandel’s problem,and coupled modeling of a faulted porous medium and a faulted aquifer are *** modeling results obtained from the developed method show a very good agreement with those by other modeling methods,which indicates its accuracy.

关键词： Thermo-hydro-mechanical(THM) simulation geomechanical coupling Zero-thickness element Joint element Finite element

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Wellbore stability analysis to determine the safe mud weight window for sandstone layers

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Petroleum Exploration and Development 2019年第5期46卷 1031-1038页

作者： DARVISHPOUR Ayoub CHERAGHI SEIFABAD Masoud WOOD David Anthony GHORBANI Hamzeh Department of Mining Engineering Isfahan University of TechnologyIsfahan ***Iran DWA Energy Limited LincolnLN59JPUnited Kingdom Southern Oil Fields National Iranian Oil CompanyTeheran ***Iran

The wellbore stability of a vertical well through the sandstone reservoir layers of the Asmari oil-bearing formation in south-west Iran is *** safe drilling-fluid density range for maintaining wellbore stability is determined and simulated using FLAC3 D software and a finite volume model established with drilled strata geomechanical *** initiation of plastic condition is used to determine the safe mud weight window(SMWW)in specific sandstone *** effects of rock strength parameters,major stresses around the wellbore and pore pressure on the SMWW are investigated for this *** analysis reveals that a reduction in cohesion and internal friction angle values leads to a significant narrowing of the *** the other hand,the reduction of pore pressure and the ratio between maximum and minimum horizontal stresses causes the SMWW to widen *** ability to readily quantify changes in SMWW indicates that the developed model is suitable as a well planning and monitoring tool.

关键词： wellbore stability wellbore geomechanical property safe mud weight window wellbore instability risk factors drilling stress simulation

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Comparative Analysis of the Hard Hillsides Stability by Empirical Methods and Limit Equilibrium: Case of Ultra Basic and Andesites of Mako and Marbles of Bandafassi (Senegal)

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Geomaterials 2019年第3期9卷 67-79页

作者： Déthié Sarr Oustasse Abdoulaye Sall Mapathé Ndiaye Nayini Joseph Serge Lompo UFR Sciences de l’Ingénieur University of Thiès Thiès Sénégal

The purpose of this paper is to characterize rock mass stability using basic rock mass method and to compare them. Rock mass quality and strength are determined using rock mass classification and numerical methods. The Factors of safety are calculated with the results of stereographic projection. Results show that quality of ultrabasite and marble are better than quality of andesite. The Slope Mass Ratings (SMR) show that rocks with the best quality are stable and andesite partially stable. The calculation of the factors of Safety by limit equilibrium assigns a stable state for ultrabasite and marble and instable for andesite. Calculation of Safety factor using stereographic parameters in one hand and finite element code in another shows more possibility of planar sliding along discontinuities than rock matrix failure. At last, quality of endogeneous rock mass is correlated with its stability state. The better rock mass is, the more stable the rock it is.

关键词： geomechanical Classification Mako Bandafassi Slope Stability

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Geologic Survey and Stability Analysis for the South Tower Pier of Jiangyin Yangtze Highway Bridge

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人民长江 2002年第z1期33卷 87-89页

作者： XU Fu-xingProfessor-senior Engineer, Comprehensive Reconnaissance Bureau of Changjiang Water Resources Commission, Wuhan 430010, China ZHAO Cheng-shengSenior Engineer, Comprehensive Reconnaissance Bureau of Changjiang Water Resources Commission, Wuhan 430010, China YANG Tian-mingSenior Engineer, Comprehensive Reconnaissance Bureau of Changjiang Water Resources Commission, Wuhan 430010, China Professor-senior Engineer Comprehensive Reconnaissance Bureau of Changjiang Water Resources Commission Wuhan 430010 China Senior Engineer Comprehensive Reconnaissance Bureau of Changjiang Water Resources Commission Wuhan 430010 China

Jiangyin Yangtze highway bridge is a suspension bridge with main span 1 385 m. The south tower pier is located on a 70 m bedrock slope with bedding plane of strata tipping to the river channel and several weak intercalated layers. The stability of the tower pier is one of the main engineering geologic problems. On the basis of investigation and survey of relevant geologic condition analyses, the geomechanical model experiments are carried out for stability study of various foundation alternatives’ advantages and disadvantages. Pile foundation has been finally adopted and constructed, and this is justified by practice.

关键词： stability of tower pier pile foundation geomechanical model Jiangyin Yangtze highway bridge

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