Rock masses will remain under constant load due to the engineering structures in rocks. Particularly, weak rocks undergo time-dependent deformation under constant load following the initiation of m...
岩石中的工程结构使岩体处于恒定载荷下。特别是，在恒定荷载作用下，弱岩在m - m - m的起始阶段发生随时间变化的变形。
{"title":"A new mathematical approach for representing the deformation mechanism of rocks under constant load","authors":"C. O. Aksoy, S. Safak, G. G. Uyar, V. Ozacar","doi":"10.1680/JGELE.17.00168","DOIUrl":"https://doi.org/10.1680/JGELE.17.00168","url":null,"abstract":"Rock masses will remain under constant load due to the engineering structures in rocks. Particularly, weak rocks undergo time-dependent deformation under constant load following the initiation of m...","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"218 1","pages":"80-90"},"PeriodicalIF":2.1,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76193800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper evaluates the effect of analysis parameter choices on the stability and efficiency of modelling cone penetration into sand. This very large deformation quasi-static boundary-value proble...
本文评价了分析参数的选择对模拟锥入砂的稳定性和效率的影响。这个非常大变形的准静态边值问题…
{"title":"Stability and efficiency studies in the numerical simulation of cone penetration in sand","authors":"S. Fan, B. Bienen, Mark F. Randolph","doi":"10.1680/JGELE.17.00105","DOIUrl":"https://doi.org/10.1680/JGELE.17.00105","url":null,"abstract":"This paper evaluates the effect of analysis parameter choices on the stability and efficiency of modelling cone penetration into sand. This very large deformation quasi-static boundary-value proble...","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"214 1","pages":"13-18"},"PeriodicalIF":2.1,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76588878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sanandam Bordoloi, Rojimul Hussain, V. Gadi, H. Bora, L. Sahoo, Ravi Karangat, A. Garg, S. Sreedeep
Limited studies have investigated the effect of vegetation growth and evapotranspiration (Etr) on desiccation parameter – crack intensity factor (CIF) considering a single species. Moreover, the ro...
{"title":"Monitoring soil cracking and plant parameters for a mixed grass species","authors":"Sanandam Bordoloi, Rojimul Hussain, V. Gadi, H. Bora, L. Sahoo, Ravi Karangat, A. Garg, S. Sreedeep","doi":"10.1680/JGELE.17.00145","DOIUrl":"https://doi.org/10.1680/JGELE.17.00145","url":null,"abstract":"Limited studies have investigated the effect of vegetation growth and evapotranspiration (Etr) on desiccation parameter – crack intensity factor (CIF) considering a single species. Moreover, the ro...","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"17 1","pages":"1-7"},"PeriodicalIF":2.1,"publicationDate":"2018-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90126970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Amundsen, J. Jønland, A. Emdal, V. Thakur, J. Y. Won, J. Greenwood, I. A. Contreras, F. G. Hernandez-Martinez
{"title":"Discussion: An attempt to monitor pore pressure changes in a block sample during and after sampling","authors":"H. Amundsen, J. Jønland, A. Emdal, V. Thakur, J. Y. Won, J. Greenwood, I. A. Contreras, F. G. Hernandez-Martinez","doi":"10.1680/JGELE.17.00162","DOIUrl":"https://doi.org/10.1680/JGELE.17.00162","url":null,"abstract":"","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"68 1","pages":"352-355"},"PeriodicalIF":2.1,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74474835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The brittle fracture mechanism of shale is an important issue to both borehole stability and hydraulic fracturing. A number of experimental studies on shale macroscopic mechanical properties have been carried out; however, the acoustic emission (AE) patterns of anisotropic shale are not fully understood. In this paper, a series of uniaxial compressive strength tests were conducted on cylindrical shale obtained by drilling at different orientations to the bedding plane. The anisotropic failure modes of shale samples have been monitored by real-time AE monitoring and stress–strain response, under ambient conditions and uniaxial stresses. The experimental results suggest that the pronounced bedding planes of shale have a significant influence on the mechanical properties and the AE responses. The AE counts and AE accumulative energy release curves clearly indicate the initiation and propagation of cracks during compression, and the ‘U’ shaped curves well reflect the anisotropic failure mechanism. The sounded...
{"title":"Acoustic emission pattern of shale under uniaxial deformation","authors":"Y. Wang, C. H. Li, Y. Z. Hu, S. Miao","doi":"10.1680/JGELE.17.00056","DOIUrl":"https://doi.org/10.1680/JGELE.17.00056","url":null,"abstract":"The brittle fracture mechanism of shale is an important issue to both borehole stability and hydraulic fracturing. A number of experimental studies on shale macroscopic mechanical properties have been carried out; however, the acoustic emission (AE) patterns of anisotropic shale are not fully understood. In this paper, a series of uniaxial compressive strength tests were conducted on cylindrical shale obtained by drilling at different orientations to the bedding plane. The anisotropic failure modes of shale samples have been monitored by real-time AE monitoring and stress–strain response, under ambient conditions and uniaxial stresses. The experimental results suggest that the pronounced bedding planes of shale have a significant influence on the mechanical properties and the AE responses. The AE counts and AE accumulative energy release curves clearly indicate the initiation and propagation of cracks during compression, and the ‘U’ shaped curves well reflect the anisotropic failure mechanism. The sounded...","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"13 1","pages":"323-329"},"PeriodicalIF":2.1,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87520436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sravan Muguda, S. Booth, P. Hughes, C. Augarde, C. Perlot, A. Bruno, D. Gallipoli
Soil-based construction materials are of interest as structural building materials due to their green credentials, as well as being present in many historical structures. For effective conservation of the latter, and to motivate greater uptake for new construction, understanding of the mechanical and hydraulic properties of these materials is in need of improvement. Earthen construction materials can be considered to be manufactured unsaturated soils, and advances in understanding can be made by considering them from a geotechnical point of view. This paper presents initial results from a major programme of testing, seeking improved properties for earthen construction materials, where unusual organic compounds have been employed as stabilisers. Two gums (guar and xanthan) used as stabilisers for a soil mixture are shown to have significant effects on certain mechanical properties, some of which can be explained, and other aspects which are in need of further investigation.
{"title":"Mechanical properties of biopolymer-stabilised soil-based construction materials","authors":"Sravan Muguda, S. Booth, P. Hughes, C. Augarde, C. Perlot, A. Bruno, D. Gallipoli","doi":"10.1680/JGELE.17.00081","DOIUrl":"https://doi.org/10.1680/JGELE.17.00081","url":null,"abstract":"Soil-based construction materials are of interest as structural building materials due to their green credentials, as well as being present in many historical structures. For effective conservation of the latter, and to motivate greater uptake for new construction, understanding of the mechanical and hydraulic properties of these materials is in need of improvement. Earthen construction materials can be considered to be manufactured unsaturated soils, and advances in understanding can be made by considering them from a geotechnical point of view. This paper presents initial results from a major programme of testing, seeking improved properties for earthen construction materials, where unusual organic compounds have been employed as stabilisers. Two gums (guar and xanthan) used as stabilisers for a soil mixture are shown to have significant effects on certain mechanical properties, some of which can be explained, and other aspects which are in need of further investigation.","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"243 1","pages":"309-314"},"PeriodicalIF":2.1,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72936928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Choi, Yi-fei Cui, L. H. D.Liu, C. Ng, S. Lourenço
Curved seawalls remain one of the most widely adopted coastal-protection measure. A curved face redirects flow momentum and prevents waves from overtopping. Likewise, the use of curvatures for landslide barriers merits investigation given their potential engineering value in reducing the runup height and impact force of geophysical flows. In this study, flume tests were carried out to explore the impact mechanism of dry granular flow against a curved barrier. The impact force, runup height and regime transition path of granular flow for both vertical and curved barriers were compared under different Froude conditions (Fr = 4.7 and 6.4). Results reveal that in comparison to a vertical barrier, curved barriers reduce the runup height and elongate the duration of impact by up to 17% and 15%, respectively. For curved barriers, the impact force is reduced by up to 25% for coarser granular flows. By contrast, the impact force does not exhibit a significant reduction for finer granular flows. Furthermore, result...
{"title":"Impact mechanisms of granular flow against curved barriers","authors":"C. Choi, Yi-fei Cui, L. H. D.Liu, C. Ng, S. Lourenço","doi":"10.1680/JGELE.17.00068","DOIUrl":"https://doi.org/10.1680/JGELE.17.00068","url":null,"abstract":"Curved seawalls remain one of the most widely adopted coastal-protection measure. A curved face redirects flow momentum and prevents waves from overtopping. Likewise, the use of curvatures for landslide barriers merits investigation given their potential engineering value in reducing the runup height and impact force of geophysical flows. In this study, flume tests were carried out to explore the impact mechanism of dry granular flow against a curved barrier. The impact force, runup height and regime transition path of granular flow for both vertical and curved barriers were compared under different Froude conditions (Fr = 4.7 and 6.4). Results reveal that in comparison to a vertical barrier, curved barriers reduce the runup height and elongate the duration of impact by up to 17% and 15%, respectively. For curved barriers, the impact force is reduced by up to 25% for coarser granular flows. By contrast, the impact force does not exhibit a significant reduction for finer granular flows. Furthermore, result...","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"114 1","pages":"330-338"},"PeriodicalIF":2.1,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85391919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The consolidation of a cemented mine fill is controlled by the rate of backfilling in regard to its permeability as well as the companion chemical shrinkage due to hydration reaction. A unified equation is derived in the study to delineate the one-dimensional (1D) deposition and consolidation of shrinking mine fills based on a generic description of the entangled chemo–hygro–mechanical processes. The proposed equation has taken into account the compressibility of each phase and the refinement of pore space due to phase exchange of water during hydration, which are lacking in other 1D formulations. The resulting equation would thus allow for more rational and convenient analyses of mine-fill consolidation during accretion and after deposition with a unified model. The improvement is practically at the mere expense of introducing only one additional parameter (the stiffness of solid grains) compared with existing benchmark equations. Parametric analyses performed with the proposed equation have revealed the...
{"title":"A model for one-dimensional deposition and consolidation of shrinking mine fills","authors":"G. Lu","doi":"10.1680/JGELE.17.00123","DOIUrl":"https://doi.org/10.1680/JGELE.17.00123","url":null,"abstract":"The consolidation of a cemented mine fill is controlled by the rate of backfilling in regard to its permeability as well as the companion chemical shrinkage due to hydration reaction. A unified equation is derived in the study to delineate the one-dimensional (1D) deposition and consolidation of shrinking mine fills based on a generic description of the entangled chemo–hygro–mechanical processes. The proposed equation has taken into account the compressibility of each phase and the refinement of pore space due to phase exchange of water during hydration, which are lacking in other 1D formulations. The resulting equation would thus allow for more rational and convenient analyses of mine-fill consolidation during accretion and after deposition with a unified model. The improvement is practically at the mere expense of introducing only one additional parameter (the stiffness of solid grains) compared with existing benchmark equations. Parametric analyses performed with the proposed equation have revealed the...","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"4 1","pages":"347-351"},"PeriodicalIF":2.1,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82647159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Studying basalt thermal diffusivity under high temperature or high pressure is helpful to understand the lithospheric thermal structure and dynamics of subduction zone and to evaluate the heat-tran...
研究高温高压下玄武岩的热扩散系数有助于认识俯冲带的岩石圈热结构和动力学，有助于评价俯冲带的热传递。
{"title":"Temperature and pressure effects on basalt thermal diffusivity – a review","authors":"Y. Zhang, Q. Sun","doi":"10.1680/JGELE.17.00064","DOIUrl":"https://doi.org/10.1680/JGELE.17.00064","url":null,"abstract":"Studying basalt thermal diffusivity under high temperature or high pressure is helpful to understand the lithospheric thermal structure and dynamics of subduction zone and to evaluate the heat-tran...","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"18 1","pages":"315-322"},"PeriodicalIF":2.1,"publicationDate":"2017-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72867915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Nguyen, H. Heindl, Jean-Michel Pereira, A. Tang, J. Frost
Loess covers large portions of Earth's surface. Loess deposits are typically composed of silt with clay and fine sand particles and usually reach a few meters in thickness. Thermal conductivity of loess varies over a relatively large range from 0·07 to 2 W/(m.K), depending on the particle composition, soil texture and also moisture content. In this study, intact loess was sampled at shallow depth (1 m) in Northern France. Suction, volumetric moisture content and thermal conductivity of soil were measured simultaneously during the application of wetting/drying cycles to the sample. The results show that the volumetric moisture content significantly influences the soil thermal conductivity. As is the case for the water-retention curve, a hysteresis loop can be observed when plotting the thermal conductivity against suction. However, no hysteresis appears when the thermal conductivity is plotted as a function of the degree of saturation.
{"title":"Water retention and thermal conductivity of a natural unsaturated loess","authors":"V. Nguyen, H. Heindl, Jean-Michel Pereira, A. Tang, J. Frost","doi":"10.1680/JGELE.17.00037","DOIUrl":"https://doi.org/10.1680/JGELE.17.00037","url":null,"abstract":"Loess covers large portions of Earth's surface. Loess deposits are typically composed of silt with clay and fine sand particles and usually reach a few meters in thickness. Thermal conductivity of loess varies over a relatively large range from 0·07 to 2 W/(m.K), depending on the particle composition, soil texture and also moisture content. In this study, intact loess was sampled at shallow depth (1 m) in Northern France. Suction, volumetric moisture content and thermal conductivity of soil were measured simultaneously during the application of wetting/drying cycles to the sample. The results show that the volumetric moisture content significantly influences the soil thermal conductivity. As is the case for the water-retention curve, a hysteresis loop can be observed when plotting the thermal conductivity against suction. However, no hysteresis appears when the thermal conductivity is plotted as a function of the degree of saturation.","PeriodicalId":48920,"journal":{"name":"Geotechnique Letters","volume":"28 1","pages":"286-291"},"PeriodicalIF":2.1,"publicationDate":"2017-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73233320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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