Pub Date : 2017-02-23DOI: 10.1201/9781138027619-25
Zheng Yingren
Solid material develops from elastic to plastic then to failure after undertaking some load,which means that yield is different from failure.The system of yield criteria for geomaterial is discussed and two definitions which are point failure and surface failure in stress field are put forward.And the criteria of surface whole failure is defined through traditional limit analysis method.Simultaneously,the deficiencies for traditional limit analysis and numerical analysis are pointed out by reviewing and analyzing the solution characteristics of traditional limit analysis method.Based on the combination of these two methods,a newly developed numerical limit analysis method is built,which has enlarged the application rage of limit analysis.The significances and features of traditional limit analysis method and numerical limit method are studied,as well as the reliabilities.The advantages and disadvantages of numerical limit analysis are listed;and the wide applicability of numerical limit analysis in the slope(landslide) engineering,foundation engineering and tunnel engineering is illustrated.
{"title":"Development and application of numerical limit analysis for geotechnical materials","authors":"Zheng Yingren","doi":"10.1201/9781138027619-25","DOIUrl":"https://doi.org/10.1201/9781138027619-25","url":null,"abstract":"Solid material develops from elastic to plastic then to failure after undertaking some load,which means that yield is different from failure.The system of yield criteria for geomaterial is discussed and two definitions which are point failure and surface failure in stress field are put forward.And the criteria of surface whole failure is defined through traditional limit analysis method.Simultaneously,the deficiencies for traditional limit analysis and numerical analysis are pointed out by reviewing and analyzing the solution characteristics of traditional limit analysis method.Based on the combination of these two methods,a newly developed numerical limit analysis method is built,which has enlarged the application rage of limit analysis.The significances and features of traditional limit analysis method and numerical limit method are studied,as well as the reliabilities.The advantages and disadvantages of numerical limit analysis are listed;and the wide applicability of numerical limit analysis in the slope(landslide) engineering,foundation engineering and tunnel engineering is illustrated.","PeriodicalId":39725,"journal":{"name":"岩石力学与工程学报","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43929697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-09-15DOI: 10.13722/J.CNKI.JRME.2014.0982
Jun Zheng, P. Kulatilake, Jianhui Deng, Jinbing Wei
{"title":"A monte carlo simulation for discontinuity orientations using bivariate empirical distribution","authors":"Jun Zheng, P. Kulatilake, Jianhui Deng, Jinbing Wei","doi":"10.13722/J.CNKI.JRME.2014.0982","DOIUrl":"https://doi.org/10.13722/J.CNKI.JRME.2014.0982","url":null,"abstract":"","PeriodicalId":39725,"journal":{"name":"岩石力学与工程学报","volume":"34 1","pages":"3922-3929"},"PeriodicalIF":0.0,"publicationDate":"2015-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66578898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-08-01DOI: 10.13722/J.CNKI.JRME.2014.S2.007
Xian Shi, Yuanfang Cheng, Shu Jiang, Dongsheng Cai, Tao Zhang
The study of shale mechanical properties is very important for well completion and stimulation in shale gas reservoirs. Thus,the geomechanical properties of Paleozoic marine shale in Lower Yangtze Basin were studied.With the application of argon ion polisher,high-solution CT and scanning electron microscope,the shale samples were processed and their microstructures were observed. Besides, mineral compositions of this shale were analyzed by XRD technique. In order to get the compression characteristic of shale, the scratch and uniaxial experiments were performed. In addition, the loading and unloading situations were simulated under different effective stress conditions in order to reduce negative effects of natural fissures and rock relaxation. Finally,the multi-stage triaxial compression deformation experiment was performed on the triaxial rock testing system for calculating cohesive strength and inherent friction angle. The study of shale mechanical properties is veryimportant for well completion and stimulation in shale gas reservoirs. Thus, a systematic experiments was performed on Paleozoic marine shale samples collected from Lower Yangtze Basin, and the microscopic structure,mineral compositions and the geomechanical properties of marine shale samples were studied. Testing result shows that except for shale sample with natural fractures,both the values of Youngs modulus and Poissons ratio increase with the increase of confining pressure. But in the unloading condition, the Young s modulus increases with the decrease of confining pressure,whereas the Poisson s ratio is greater than that in its loading condition. The inherent friction angle is within approximately 40°and the shale sample with high brittleness index tends to crack as fracture network according to the multi-stage triaxial compression test. This research is greatly helpful for the study of shale mechanical properties,and provides technical parameters for well completion design and stimulation.
{"title":"Experimental study of microstructure and rock properties of shale samples","authors":"Xian Shi, Yuanfang Cheng, Shu Jiang, Dongsheng Cai, Tao Zhang","doi":"10.13722/J.CNKI.JRME.2014.S2.007","DOIUrl":"https://doi.org/10.13722/J.CNKI.JRME.2014.S2.007","url":null,"abstract":"The study of shale mechanical properties is very important for well completion and stimulation in shale gas reservoirs. Thus,the geomechanical properties of Paleozoic marine shale in Lower Yangtze Basin were studied.With the application of argon ion polisher,high-solution CT and scanning electron microscope,the shale samples were processed and their microstructures were observed. Besides, mineral compositions of this shale were analyzed by XRD technique. In order to get the compression characteristic of shale, the scratch and uniaxial experiments were performed. In addition, the loading and unloading situations were simulated under different effective stress conditions in order to reduce negative effects of natural fissures and rock relaxation. Finally,the multi-stage triaxial compression deformation experiment was performed on the triaxial rock testing system for calculating cohesive strength and inherent friction angle. The study of shale mechanical properties is veryimportant for well completion and stimulation in shale gas reservoirs. Thus, a systematic experiments was performed on Paleozoic marine shale samples collected from Lower Yangtze Basin, and the microscopic structure,mineral compositions and the geomechanical properties of marine shale samples were studied. Testing result shows that except for shale sample with natural fractures,both the values of Youngs modulus and Poissons ratio increase with the increase of confining pressure. But in the unloading condition, the Young s modulus increases with the decrease of confining pressure,whereas the Poisson s ratio is greater than that in its loading condition. The inherent friction angle is within approximately 40°and the shale sample with high brittleness index tends to crack as fracture network according to the multi-stage triaxial compression test. This research is greatly helpful for the study of shale mechanical properties,and provides technical parameters for well completion design and stimulation.","PeriodicalId":39725,"journal":{"name":"岩石力学与工程学报","volume":"33 1","pages":"3439-3445"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66578972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-01-01DOI: 10.13722/J.CNKI.JRME.2014.10.005
Q. Yue
A new technique,a new method and a new law were put forward for the refinements and upgrading of current engineering rock mass quality classification methods,i.e. the automatic drilling process monitoring(DPM) technique,the fast and direct time-series analysis of the DPM data and the DPM based findings that the curve of the drill bit advancement depth versus the net drilling time can be easily measured and calculated and that it can be represented as a set of connected linear lines. Each linear line zone has a constant slope gradient or drilling speed and represents an intact and homogeneous rock block. The position of the curve slope gradient jump between any two connected linear zones represents a discontinuity plane. DPM can offer a new measurement method and many factual data for the refinements and upgrading. Consequently,the uniaxial compressive strengths,sizes and spatial locations of rock material blocks and the associated discontinuities in underground can be rapidly,effectively,objectively and quantitatively measured and estimated. Case studies are given to illustrate,explain and describe the new technique,the new method and the new law. The approach and its associated equations were presented to refine and upgrade the current RQD,Q,RMR and BQ methods for rock mass quality classifications. The methods for objectively and effectively measure were included and the rock strength,RQD,rock mass integrity,rock hardness and discontinuities were estimated.
{"title":"DRILLING PROCESS MONITORING FOR REFINING AND UPGRADING ROCK MASS QUALITY CLASSIFICATION METHODS","authors":"Q. Yue","doi":"10.13722/J.CNKI.JRME.2014.10.005","DOIUrl":"https://doi.org/10.13722/J.CNKI.JRME.2014.10.005","url":null,"abstract":"A new technique,a new method and a new law were put forward for the refinements and upgrading of current engineering rock mass quality classification methods,i.e. the automatic drilling process monitoring(DPM) technique,the fast and direct time-series analysis of the DPM data and the DPM based findings that the curve of the drill bit advancement depth versus the net drilling time can be easily measured and calculated and that it can be represented as a set of connected linear lines. Each linear line zone has a constant slope gradient or drilling speed and represents an intact and homogeneous rock block. The position of the curve slope gradient jump between any two connected linear zones represents a discontinuity plane. DPM can offer a new measurement method and many factual data for the refinements and upgrading. Consequently,the uniaxial compressive strengths,sizes and spatial locations of rock material blocks and the associated discontinuities in underground can be rapidly,effectively,objectively and quantitatively measured and estimated. Case studies are given to illustrate,explain and describe the new technique,the new method and the new law. The approach and its associated equations were presented to refine and upgrade the current RQD,Q,RMR and BQ methods for rock mass quality classifications. The methods for objectively and effectively measure were included and the rock strength,RQD,rock mass integrity,rock hardness and discontinuities were estimated.","PeriodicalId":39725,"journal":{"name":"岩石力学与工程学报","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66578917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The lining segment is in a complex stress state during shield tunnel construction,which is prone to go dislocation and have wholly rising displacement.Based on the analysis of segment in grouting section and considering static buoyancy and dynamic buoyancy,the buoyancy is respectively analyzed during shield tunnel construction.The mechanical model for segment ring in floating phase and calculation formula are presented,respectively.Aiming at the difference of segment ring between normal design state and floating state,the modified routine method is carried out to calculate lining internal force to draw a comparison.The results show that,comparing with segment ring in the normal design state,the bending moment,shear force and axial force values of segment increase by 60%,51% and 46% in floating state,which indicates that segment floating is adverse to its safety.The stress of segment is affected by dynamic buoyancy greatly during construction stage,which is larger than static buoyancy and must controlled reasonably for preventing the segment fracture.
{"title":"MECHANICAL ANALYSIS OF SEGMENT FLOATING DURING SHIELD TUNNEL CONSTRUCTION","authors":"G. Wei, Jie Hong, X. Wei","doi":"10.2495/AIE120631","DOIUrl":"https://doi.org/10.2495/AIE120631","url":null,"abstract":"The lining segment is in a complex stress state during shield tunnel construction,which is prone to go dislocation and have wholly rising displacement.Based on the analysis of segment in grouting section and considering static buoyancy and dynamic buoyancy,the buoyancy is respectively analyzed during shield tunnel construction.The mechanical model for segment ring in floating phase and calculation formula are presented,respectively.Aiming at the difference of segment ring between normal design state and floating state,the modified routine method is carried out to calculate lining internal force to draw a comparison.The results show that,comparing with segment ring in the normal design state,the bending moment,shear force and axial force values of segment increase by 60%,51% and 46% in floating state,which indicates that segment floating is adverse to its safety.The stress of segment is affected by dynamic buoyancy greatly during construction stage,which is larger than static buoyancy and must controlled reasonably for preventing the segment fracture.","PeriodicalId":39725,"journal":{"name":"岩石力学与工程学报","volume":"1 1","pages":"577-584"},"PeriodicalIF":0.0,"publicationDate":"2012-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68977867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-01-01DOI: 10.1007/978-3-540-89465-0_47
Mei-li Zhan, J. Sheng, J. Cen
{"title":"Experimental and Analytical Study of Hydraulic Fracturing of Cylinder Sample","authors":"Mei-li Zhan, J. Sheng, J. Cen","doi":"10.1007/978-3-540-89465-0_47","DOIUrl":"https://doi.org/10.1007/978-3-540-89465-0_47","url":null,"abstract":"","PeriodicalId":39725,"journal":{"name":"岩石力学与工程学报","volume":"1 1","pages":"252-256"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51066881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-01-01DOI: 10.4028/0-87849-989-x.327
Wang Shui-lin
A series of formulas about two-parameter parabolic Mohr strength criterion are derived.Based on the results of uniaxial tension test and uniaxial compression test,the parameters involved in the criterion can be determined,and the damage pattern is also discussed.After that,the formulas about the rupture angle and the friction angle are presented,and the formula of their relationship is also presented.Two-parameter parabolic Mohr strength criterion can describe both shear failure mode and tensile failure mode.In this criterion,the ratio of the uniaxial compression strength and the uniaxial tension strength can be set any value.The formulas of the rupture angle provide concrete theoretical foundation for the direction of crack face and damage pattern in the computation of macro crack propagation.At last,it is also pointed out that Griffith criterion is only an exceptional case of two-parameter parabolic Mohr strength criterion.
{"title":"RESEARCH ON TWO-PARAMETER PARABOLIC MOHR STRENGTH CRITERION AND ITS DAMAGE REGULARITY","authors":"Wang Shui-lin","doi":"10.4028/0-87849-989-x.327","DOIUrl":"https://doi.org/10.4028/0-87849-989-x.327","url":null,"abstract":"A series of formulas about two-parameter parabolic Mohr strength criterion are derived.Based on the results of uniaxial tension test and uniaxial compression test,the parameters involved in the criterion can be determined,and the damage pattern is also discussed.After that,the formulas about the rupture angle and the friction angle are presented,and the formula of their relationship is also presented.Two-parameter parabolic Mohr strength criterion can describe both shear failure mode and tensile failure mode.In this criterion,the ratio of the uniaxial compression strength and the uniaxial tension strength can be set any value.The formulas of the rupture angle provide concrete theoretical foundation for the direction of crack face and damage pattern in the computation of macro crack propagation.At last,it is also pointed out that Griffith criterion is only an exceptional case of two-parameter parabolic Mohr strength criterion.","PeriodicalId":39725,"journal":{"name":"岩石力学与工程学报","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2005-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70641194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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