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Modelling the viscoplastic behaviour of Callovo-Oxfordian claystone with consideration of damage effect

Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 303-316页

作者： Hao Wang yu-jun cui Minh Ngoc Vu Jean Talandier Ecole des Ponts ParisTech Laboratoire Navier/CERMES6 et 8 avenue Blaise PascalMarne La Vallée cedex 277455France Andra R&D DepartmentChâtenay-Malabry92290France

In order to evaluate the performance of deep geological disposal of radioactive waste,an underground research laboratory(URL)was constructed by Andra in the Callovo-Oxfordian(COx)claystone formation at the Meuse/Haute-Marne(MHM).The construction of URL induced the excavation damage of host formations,and the ventilation in the galleries desaturated the host formation close to the gallery ***,it is expected that the mechanical behaviour of COx claystone is *** study presents a constitutive model developed to describe the viscoplastic behaviour of unsaturated and damaged COx *** this model,the unsaturation effect is considered by adopting the Bishop effective stress and the van Genuchten(VG)water retention *** terms of the viscoplastic behaviour,the nonstationary flow surface(NSFS)theory for unsaturated soils is used with consideration of the coupled effects of strain rate and suction on the yield stress.A progressive hardening law is ***,a non-associated flow rule is used,which is similar to that in Barcelona basic model(BBM).In addition,to describe the damage effect induced by suction change and viscoplastic loading,a damage function is defined based on the crack volume *** damage function contains two variables:unsaturated effective stress and viscoplastic volumetric strain,with the related parameters determined based on the mercury intrusion porosimetry(MIP)*** the model validation,different tests on COx claystone under different loading paths are *** between experimental and simulated results indicated that the present model is able to well describe the viscoplastic behaviour of damaged COx claystone,including swelling/shrinkage,triaxial extension and compression,and triaxial creep.

关键词： Callovo-Oxfordian(COx)claystone Excavation damage Time-dependent behaviour Suction Viscoplastic model

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教育数字化背景下高职院校军事理论课程资源建设研究——以长沙航空职业技术学院为例

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湖北职业技术学院学报 2024年第2期27卷 88-92,108页

作者：谭璐余翠军长沙航空职业技术学院湖南长沙410124

对高职院校军事理论课程数字资源建设现状进行调研,针对需求、机制、理论、成效四个方面分析目前军事理论课程数字资源建设存在的问题,长沙航空职业技术学院遵循军事理论课程资源建设思路,构建高职院校军事理论课程资源模型,提出“五层... 详细信息

对高职院校军事理论课程数字资源建设现状进行调研,针对需求、机制、理论、成效四个方面分析目前军事理论课程数字资源建设存在的问题,长沙航空职业技术学院遵循军事理论课程资源建设思路,构建高职院校军事理论课程资源模型,提出“五层”原则设计、“六阶”步骤规划、“五化”路径探索的三维结构,提高高职院校的国防教育质量。

关键词：军事理论课课程资源建设定向培养军士学员

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On the hydro-mechanical behaviour of MX80 bentonite-based materials

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第3期9卷 183-192页

作者： yu-jun cui Ecole des Ponts ParisTech Laboratoire Navier/CERMES 6e8 av. Blaise Pascal Cité Descartes Champs e sur e Marne 77455 Marne-la=Valléecedex 2France

Bentonite-based materials have been considered in many countries as engineered barrier/backfilling materials in deep geological disposal of high-level radioactive *** the long period of waste storage,these materials will play an essential role in ensuring the integrity of the storage system that consists of the waste canisters,the engineered barrier/backfill,the retaining structures as well as the geological ***,it is essential to well understand the hydro-mechanical behaviours of these bentonite-based *** review paper presents the recent advances of knowledge on MX80 bentonite-based materials,in terms of water retention properties,hydraulic behaviour and mechanical *** is put on the effect of technological voids and the role of the dry density of *** swelling anisotropy is also discussed based on the results from swelling tests with measurements of both axial and radial swelling pressures on a sand-bentonite mixture compacted at different *** observation was used to help the interpretation of macroscopic hydromechanical ***,the evolution of soil microstructure thus the soil density over time is discussed based on the results from mock-up *** evolution is essential for understanding the longterm hydro-mechanical behaviour of the engineered barrier/backfill.

关键词： Bentonite-based materials Water retention Hydraulic conductivity Mechanical behaviour Microstructure Dry density evolution

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Determining the soil-water retention curve using mercury intrusion porosimetry test in consideration of soil volume change

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第5期12卷 1070-1079页

作者： Wen-Jing Sun yu-jun cui State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China Department of Civil Engineering School of Mechanics and Engineering ScienceShanghai UniversityShanghai200444China Ecole des Ponts ParisTech Laboratoire Navier/CERMES6e8 avenue Blaise PascalCitéDescartesChamps-sur-MarneMarne-la-Vallée cedex 277455France Institute for the Conservation of Cultural Heritage Shanghai200444China

It is well-known that a close link exists between soil-water retention curve(SWRC)and pore size distribution(PSD).Theoretically,mercury intrusion porosimetry(MIP)test simulates a soil drying path and the test results can be used to deduce the SWRC(termed SWRCMIP).However,SWRCMIP does not include the effect of volume change,compared with the conventional SWRC that is directly determined by suction measurement or suction control *** deformable soils,there is a significant difference between conventional SWRC and *** this study,drying test was carried out on a reconstituted silty soil,and the volume change,suction,and PSD were measured on samples with different water *** change in the deduced SWRCMIP and its relationship with the conventional SWRC were *** results showed that the volume change of soil is the main reason accounting for the difference between conventional SWRC and *** on the test results,a transformation model was then proposed for conventional SWRC and SWRCMIP,for which the soil state with no volume change is taken as a *** between the experimental and predicted SWRCs showed that the proposed model can well consider the influence of soil volume change on its water retention property.

关键词： Soil-water retention curve(SWRC) Mercury intrusion porosimetry(MIP) Pore size distribution(PSD) Deformable soils

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Assessment of the methods for determining net radiation at different time-scales of meteorological variables

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第2期9卷 239-246页

作者： Ni An Sahar Hemmati yu-jun cui Ecole des Ponts ParisTech Laboratoire Navier/CERMES6e8 av. Blaise PascalCité DescartesChamps sur Marne77455 Marne la ValléeFrance Université Paris-Est IFSTTARGERS14e20 Boulevard NewtonCité DescartesChamps sur Marne77447 Marne la ValléeFrance

When modeling the soil/atmosphere interaction,it is of paramount importance to determine the net radiation *** are two common calculation methods for this *** 1 relies on use of air temperature,while Method 2 relies on use of both air and soil ***,there has been no consensus on the application of these two *** this study,the half-hourly data of solar radiation recorded at an experimental embankment are used to calculate the net radiation and long-wave radiation at different time-scales(half-hourly,hourly,and daily) using the two *** results show that,compared with Method 2 which has been widely adopted in agronomical,geotechnical and geo-environmental *** 1 is more feasible for its simplicity and accuracy at shorter ***,in case of longer time-scale,daily for instance,less variations of net radiation and long-wave radiation are obtained,suggesting that no detailed soil temperature variations can be *** other words,shorter time-scales are preferred in determining net radiation flux.

关键词： Energy balance Net radiation Different time-scales Meteorological data

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Effect of water chemistry on the hydro-mechanical behaviour of compacted mixtures of claystone and Na/Ca-bentonites for deep geological repositories

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第2期14卷 527-536页

作者： Zhixiong Zeng yu-jun cui Jean Talandier Laboratoire Navier/CERMES Ecole des Ponts ParisTechMarne La Vallée77455France French National Radioactive Waste Management Agency(Andra) Châtenay-Malabry92298France

In the French deep geological disposal for radioactive wastes,compacted bentonite/claystone mixtures have been considered as possible sealing *** emplacement in place,such mixtures are hydrated by the site solution as well as the cement solution produced by the degradation of *** this study,the effects of synthetic site solution and cement solution on the hydro-mechanical behaviour of compacted mixtures of claystone and two types of bentonites(MX80 Na-bentonite and Sardinia Cabentonite)were investigated by carrying out a series of swelling pressure,hydraulic conductivity and mercury intrusion porosimetry(MIP)*** was found that for the MX80 bentonite/claystone mixture hydrated with synthetic site solution,the swelling capacity was reduced compared to the case with deionised water owing to the transformation of Na-montmorillonite to multi-cation dominant montmorillonite by cation *** the Sardinia bentonite/claystone mixture,the similar increasing rate of swelling pressure was observed during the crystalline swelling process for different solutions,suggesting insignificant cation ***,the cations in the synthetic site solution could reduce the thickness of diffuse double layer and the osmotic swelling for both MX80 bentonite/claystone and Sardinia bentonite/claystone *** large-pore volume increased consequently and enhanced water *** the cement solution,the hydroxide could also dissolve the montmorillonite,reducing the swelling pressure,and increase the large-pore volume,facilitating the water ***,the decrease of swelling pressure and the increase of hydraulic conductivity were more significant in the case of low dry density because of more intensive interaction between montmorillonite and hydroxide due to the high permeability.

关键词： Bentonite/claystone mixture Synthetic site solution Cement solution Bentonite type Swelling pressure Hydraulic conductivity

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Revisiting the methods of determining hydraulic conductivity of saturated expansive clays in low-compressibility zone

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第5期12卷 1131-1136页

作者： Wei Su yu-jun cui Feng Zhang Weimin Ye Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai200092China Ecole des Ponts ParisTech UR Navier/CERMES6-8av.Blaise PascalCitéDescartesMarne-la-Vallée77455France

The hydraulic conductivity of saturated clays is commonly determined either directly by monitoring water flux or indirectly based on Terzaghi’s consolidation *** results are generally obtained from the two methods,but sometimes a significant difference can be observed,in particular for expansive *** this study,the hydraulic conductivities determined by the two methods are first compared based on existing data in the *** indirect method is then revisited attempting to explain the difference identified.A modified effective stress,considering physico-chemical interaction between face-to-face oriented particles,is finally introduced to better describe the compressibility of expansive clays and to further improve the indirect method in determining hydraulic conductivity of such soils in the low-compressibility *** tests were performed on Gaomiaozi(GMZ)bentonite slurry and the results obtained allowed the modified indirect method to be verified.

关键词： Expansive clays Laboratory tests Hydraulic conductivity Terzaghi’s consolidation equation Modified effective stress

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Determining osmotic suction through electrical conductivity for unsaturated low-plasticity soils

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第6期14卷 1946-1955页

作者： Zi Ying Nadia Benahmed yu-jun cui Myriam Duc Ecole des Ponts ParisTech Laboratoire Navier/CERMES6-8 Av.Blaise PascalCitéDescartesChamps-sur-MarneMarne-la-ValléeCedex277455France INRAE Aix Marseille UniversityUnitéde Recherche RECOVER3275 Route CézanneAix-en-Provence13182France UniversitéGustave Eiffel IFSTTAR/GERS/SRO14-20 Boulevard NewtonChamps-sur-MarneMarne-la-Vallée77447France

Determining osmotic suction from the electrical conductivity(EC)of soil pore water was widely reported in the ***,while dealing with unsaturated soils,they do not have enough soil pore water to be extracted for a reliable measurement of *** this paper,the chilled-mirror dew-point hygrometer and contact filter paper method were used to determine the total and matric suctions for low-plasticity soils with different salinities(0.05‰,2.1‰,and 6.76‰).A new piecewise function was proposed to calculate the osmotic suction,with the piecewise point corresponding to the first occurrence of precipitated salt in mixed salt solutions(synthetic seawater).EC,ion and salt concentrations used for osmotic suction calculation were transformed from the established relationships of mixed salt solution instead of experimental *** calculated osmotic suction by the proposed equation and the equations in the literature was compared with the indirectly measured one(the difference between the measured total and matric suctions).Results showed that the calculated osmotic suction,especially the one calculated using the proposed function,was in fair agreement with the indirectly measured data(especially for specimens with higher salinity of 6.76‰),suggesting that the transformation of EC and concentrations from the established relationship is a good alternative to direct measurement for lowplasticity *** particular,the proposed method could be applied to unsaturated low-plasticity soils which do not have enough soil pore water for a proper EC measurement.

关键词： Unsaturated soils Mixed salt solutions Osmotic suction Electrical conductivity(EC)

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Salinity effect on the compaction behaviour,matric suction,stiffness and microstructure of a silty soil

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第4期13卷 855-863页

作者： Zi Ying yu-jun cui Nadia Benahmed Myriam Duc Ecole des Ponts ParisTech Laboratoire Navier/CERMES6-8 av.Blaise PascalCite DescartesChamps-sur-MarneMarne-la-Vallee cedex 277455France INRAE Aix Marseille UnivRECOVEREquipe G2DR3275 route CezanneCS 40061Aix-en-Provence13182France Universite Gustave Eiffel IFSTTAR/GERS/SRO14-20 boulevard NewtonChamps-sur-MarneMarne-la-Vallee77447France

To better understand the salinity effect on the compaction behaviour of soil,standard Proctor compaction test was conducted on soil samples with different *** suction and small-strain shear modulus,G_(max),were determined and pore size distribution was also investigated on samples statically compacted at different water *** showed that with the decrease of soil salinity from initial value of 2.1‰(g of salt/kg of dry soil)to zero,the maximum dry density increased and the optimum water content decreased,whereas there was no significant change with the increase of soil salinity from 2.1‰ to 6.76‰.Interestingly,it was observed that G_(max) also decreased when the soil salinity decreased from initial value of 2.1‰ to zero and kept almost constant when the soil salinity increased from 2.1‰ to 6.76‰,for dry samples with similar matric suction and also for samples compacted at optimum state and on wet side whose matric suctions were slightly different due to the difference in remoulded water ***,the effect of salinity on compaction behaviour and G_(max) decreased for samples compacted from dry side to wet *** pore size distribution exhibited bi-modal characteristics with two populations of micro-and macro-pores not only for samples compacted on dry side and at optimum state,but also for those compacted on wet *** examination showed that the modal size of micro-pores shifted to lower values and that of macro-pores shifted to higher values for saline soil compared to the soil without salt.

关键词： Silts Compaction Suction Stiffness Microstructure

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Breakdown Behavior of Eutectic Carbide in High Speed Steel During Hot Compression

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Journal of Iron and Steel Research International 2011年第1期18卷 41-48页

作者： ZHOU Bin SHEN yu CHEN jun cui Zhen-shan National Engineering Research Center of Die and Mold CAD Shanghai Jiao Tong University Shanghai 200030 China

The evolution of euteelie carbide in as CaSl M2 high speed steeL was invesligated with hot compression test and metallographic examination. Initial rodlike or irregular eutectic carbides were broken into smaller particles during hot deformation by thermomechanical disintegration, while diffusion controlled phase transformation was not remarkable. Combining with numerical simulation, the relationship between breakdown ratio of carbide network and deformation parameters was obtained. Strain was the most important driving force to shatter euteclic carbides and disperse products. Furthermore, critical strain values were obtained, beyond which carbide network disappeared, and fractured carbides kept a stable profile and they were deformed with matrix coordinately. A higher temperature or lower strain rate resulted in a lower crilical strain.

关键词： hol compression high speed steel eulectic earbidc breakdown mechanism

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