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J M Greneche - One of the best experts on this subject based on the ideXlab platform.
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eighteen years of steel bentonite Interaction In the febex In Situ Test at the grimsel Test site In switzerland
Clays and Clay Minerals, 2019Co-Authors: Jebril Hadi, Paul Wersin, Vincent Serneels, J M GrenecheAbstract:Corrosion of steel canisters contaInIng buried high-level radioactive waste is a relevant issue for the long-term Integrity of repositories. The purpose of the present study was to evaluate this issue by examInIng two differently corroded blocks origInatIng from a full-scale In Situ Test of the FEBEX bentonite site In Switzerland. The FEBEX experiment was designed Initially as a feasibility Test of an engIneered clay barrier system and was recently dismantled after 18 years of activity. Samples were studied by ‘spatially resolved’ and ‘bulk’ experimental methods, IncludIng ScannIng Electron Microscopy, Elemental Energy Dispersive Spectroscopy (SEM-EDX), μ-Raman spectroscopy, X-ray Fluorescence (XRF), X-ray Diffraction (XRD), and 57Fe Mossbauer spectrometry, with a focus on Fe-bearIng phases. In one of the blocks, corrosion of the steel lIner led to diffusion of Fe Into the bentonite, resultIng In the formation of large (width > 140 mm) red, orange, and blue colored halos. Goethite was identified as the maIn corrosion product In the red and orange zones while no excess Fe2+ (compared to the unaffected bentonite) was observed there. Excess Fe2+ was found to have diffused further Into the clay (In the blue zones) but its speciation could not be unambiguously clarified. The results Indicate the occurrence of newly formed octahedral Fe2+ either as Fe2+ sorbed on the clay or as structural Fe2+ Inside the clay (followIng electron transfer from sorbed Fe2+). No other Indications of clay transformation or newly formed clay phases were found. The overall pattern Indicates that diffusion of Fe was Initiated when oxidizIng conditions were still prevailIng Inside the bentonite block, resultIng In the accumulation of Fe3+ close to the Interface (up to three times the origInal Fe content), and contInued when reducIng conditions were reached, allowIng deeper diffusion of Fe2+ Into the clay (InducIng an Increase of 10–12% of the Fe content).
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Eighteen years of steel–bentonite Interaction In the FEBEX In Situ Test at the Grimsel Test Site In Switzerland
Clays and Clay Minerals, 2019Co-Authors: Jebril Hadi, Paul Wersin, Vincent Serneels, J M GrenecheAbstract:Corrosion of steel canisters contaInIng buried high-level radioactive waste is a relevant issue for the long-term Integrity of repositories. The purpose of the present study was to evaluate this issue by examInIng two differently corroded blocks origInatIng from a full-scale In Situ Test of the FEBEX bentonite site In Switzerland. The FEBEX experiment was designed Initially as a feasibility Test of an engIneered clay barrier system and was recently dismantled after 18 years of activity. Samples were studied by ‘spatially resolved’ and ‘bulk’ experimental methods, IncludIng ScannIng Electron Microscopy, Elemental Energy Dispersive Spectroscopy (SEM-EDX), μ-Raman spectroscopy, X-ray Fluorescence (XRF), X-ray Diffraction (XRD), and ^57Fe Mössbauer spectrometry, with a focus on Fe-bearIng phases. In one of the blocks, corrosion of the steel lIner led to diffusion of Fe Into the bentonite, resultIng In the formation of large (width > 140 mm) red, orange, and blue colored halos. Goethite was identified as the maIn corrosion product In the red and orange zones while no excess Fe^2+ (compared to the unaffected bentonite) was observed there. Excess Fe^2+ was found to have diffused further Into the clay (In the blue zones) but its speciation could not be unambiguously clarified. The results Indicate the occurrence of newly formed octahedral Fe^2+ either as Fe^2+ sorbed on the clay or as structural Fe^2+ Inside the clay (followIng electron transfer from sorbed Fe^2+). No other Indications of clay transformation or newly formed clay phases were found. The overall pattern Indicates that diffusion of Fe was Initiated when oxidizIng conditions were still prevailIng Inside the bentonite block, resultIng In the accumulation of Fe^3+ close to the Interface (up to three times the origInal Fe content), and contInued when reducIng conditions were reached, allowIng deeper diffusion of Fe^2+ Into the clay (InducIng an Increase of 10–12% of the Fe content).
Wan Bao - One of the best experts on this subject based on the ideXlab platform.
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In-Situ Test of Pile-soil Stress Ratio of CFG Pile Composite Foundation under Embankment Load
Journal of Highway and Transportation Research and Development, 2011Co-Authors: Wan BaoAbstract:In-Situ Tests on pile-soil stress ratio of CFG pile composite foundation under earthfill embankment In DexIng-Nanchang freeway were carried out.The Test results of pile-soil stress ratio of CFG pile composite foundation with different pile spacIngs In embankment fillIng In construction and In static loadIng Test with rigid board were analyzed.The regularities of pile-soil stress ratio varyIng with load and time were discussed.The results show that(1) The variation of pile-soil stress ratio under embankment load is quite different from that under rigid load,the pile-soil stress ratio which Tested In embankment construction is much less than that under rigid load.(2) The pile-soil stress ratio Increased quickly when the height of soil was withIn 2.0 m.With a higher soil-fillIng height withIn 2～3.5 m,the pile-soil stress ratio decreased rapidly.When the soil-fillIng height was higher than 3.5 m,the stress ratio started to go up gradually,and then fluctuated.The values of pile-soil stress ratio fluctuated and stabilized In the range of 1.18～2.26 at last,and changed hardly with time.(3) The pile-soil stress ratio decreased with the Increase of pile spacIng,and the pile-soil stress ratio changes tIny when the pile spacIng Increased to a certaIn value.
Yuanfang Zhou - One of the best experts on this subject based on the ideXlab platform.
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In Situ Test on Pile-Soil Stress Ratio of CFG Pile Composite Foundation under Embankment Load
ICTE 2011, 2011Co-Authors: Hong Zhang, Youping Liu, Yuanfang ZhouAbstract:The In-Situ Test of stress ratio of CFG pile composite foundation for the express way from DexIng to Nanchang In Jiangxi provInce is done, the Test results of the pile-soil stress ratio of CFG pile composite foundation under different pile distance durIng embankment fillIng period and under loadIng Test bearIng board are analyzed, to Investigate the prInciple of gaIned--pile-soil stress ratio changIng with the time of the loadIng. The result Indicates that the variation of pile-soil stress ratio under embankment load is quite different from that under rigid load. The pile-soil stress ratio under embankment load is less than that under the loadIng Test. With the IncreasIng load, there is a great Increase at the begInnIng and decrease afterwards which is followed by flucations. FInally, it remaIns steady at the range of 1.18~2.26 and stays almost unchanged even the consolidation time changes. The pile-soil stress ratio is declInIng as the pile distance is becomIng wider. The changes will decrease to
H.a. Wallenberg - One of the best experts on this subject based on the ideXlab platform.
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SEARCH FOR UNDERGROUND OPENInGS FOR In Situ Test FACILITIES In CRYSTALLInE ROCK
Lawrence Berkeley National Laboratory, 2010Co-Authors: H.a. WallenbergAbstract:LBL-11655 UC-70 SEARCH FOR UNDERGROUND OPENInGS FOR In Situ Test FACILITIES In CRYSTALLInE ROCK Harold A. Wollenberg, Beverly Strisower, Donald J. Corrigan, Alexander N.Graf, and Maura T. O'Brien Lawrence Berkeley Laboratory Berkeley, California Howard Pratt and Mark Board Terra Tek Salt Lake City, Utah and William Hustrulid Colorado School of MInes Golden, Colorado October 1979 Revised January 1980 Prepared for the U.S. Department of Energy under Contract No. W-7405-ENG-48 through a contract with the Office of Nuclear Waste Isolation, Battelle Memorial Institute and the Nuclear Regulatory Commission. TWO-WEEK LOAN COPY This is a Library CirculatIng Copy which may be borrowed for two weeks. For a personal retention copy, call Tech. Info. Division, Ext 6782
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SEARCH FOR UNDERGROUND OPENInGS FOR In Situ Test FACILITIES In CRYSTALLInE ROCK - eScholarship
2010Co-Authors: H.a. WallenbergAbstract:LBL-11655 UC-70 SEARCH FOR UNDERGROUND OPENInGS FOR In Situ Test FACILITIES In CRYSTALLInE ROCK Harold A. Wollenberg, Beverly Strisower, Donald J. Corrigan, Alexander N.Graf, and Maura T. O'Brien Lawrence Berkeley Laboratory Berkeley, California Howard Pratt and Mark Board Terra Tek Salt Lake City, Utah and William Hustrulid Colorado School of MInes Golden, Colorado October 1979 Revised January 1980 Prepared for the U.S. Department of Energy under Contract No. W-7405-ENG-48 through a contract with the Office of Nuclear Waste Isolation, Battelle Memorial Institute and the Nuclear Regulatory Commission. TWO-WEEK LOAN COPY This is a Library CirculatIng Copy which may be borrowed for two weeks. For a personal retention copy, call Tech. Info. Division, Ext 6782
Timothy Byrne - One of the best experts on this subject based on the ideXlab platform.
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determInation of stress state In deep subsea formation by combInation of hydraulic fracturIng In Situ Test and core analysis a case study In the iodp expedition 319
Journal of Geophysical Research, 2013Co-Authors: Akio Funato, Mailinh Doan, David F Boutt, Yasuyuki Kano, Lisa C Mcneill, Timothy ByrneAbstract:[1] In Situ Test of hydraulic fracturIng (HF) provides the only way to observe In Situ stress magnitudes directly. The maximum and mInimum horizontal stresses, SHmax and ShmIn, are determIned from critical borehole pressures, i.e., the reopenIng pressure Pr and the shut-In pressure Ps, etc, observed durIng the Test. However, there is Inevitably a discrepancy between actual and measured values of the critical pressures, and this discrepancy is very significant for Pr. For effective measurement of Pr, it is necessary for the fracturIng system to have a sufficiently small compliance. A diagnostic procedure to evaluate whether the compliance of the employed fracturIng system is appropriate for SHmax determInation from Pr was developed. Furthermore, a new method for stress measurement not restricted by the system compliance and Pr is hereIn proposed. In this method, the magnitudes and orientations of SHmax and ShmIn are determIned from (i) the cross-sectional shape of a core sample and (ii) Ps obtaIned by the HF Test performed near the core depth. These ideas were applied for stress measurement In a central region of the Kumano fore-arc basIn at a water depth of 2054 m usIng a 1.6 km riser hole drilled In the Integrated Ocean DrillIng Program (IODP) Expedition 319. As a result, the stress decouplIng through a boundary at 1285 m below seafloor was detected. The boundary separates new upper layers and old lower ones with an age gap of ~1.8 Ma, which is possibly the accretionary prism. The stress state In the lower layers is consistent with that observed In the outer edge of accretionary prism.
