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Numer.cal study on the use of soft mater.al walls to enhance seismic per.or.ance of an existing tunnel

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Under.r.und Space 2024年第2期15卷 90-112页

作者： Qiangqiang Sun Menghao Hou Daniel dias Institute of Geotechnical Engineer.ng College of Civil Engineering and ArchitectureHebei UniversityBaoding 071002China Labor.tor. 3Sr CNRS UMR 5521Grenoble Alpes UniversityGrenoble 38000France

Seismic r.sk is one of the biggest challenges for.tunnel safety,and sever.l mitigation techniques have been pr.posed to enhance the seismic per.or.ance of existing *** paper.aims to investigate the effectiveness of an innovative appr.ach for.r.ducing the seismic r.sk of existing tunnels by using soft mater.al walls(SMW)symmetr.cally installed in the sur.ounding *** investigation is per.or.ed with a two-dimensional numer.cal model and the effectiveness of SMW in mitigating the seismic-induced lining for.es is quantitatively evaluated by r.duction *** influences of nonlinear.pr.per.ies of soil,SMW and tunnel lining on the isolation effectiveness ar. also *** par.metr.c studies show that the computed r.duction r.tio is str.ngly affected by the modulus r.tio between the SMW and the soil,the wall geometr.c par.meter.and the flexibility *** is mor. effective for.the thick and soft isolation walls that ar. inser.ed near.a stiff tunnel in the soft *** tunnel seismic r.sponse can be r.duced by up to 50%for.the scenar.os ***,the par.metr.c study identifies an optimum nor.alized depth of SMW and r.commends a r.lation between the maximum isolation effect and the flexibility ***,simple char.s ar. suggested in this wor. for.estimating the isolation effect in specific conditions of the soil and the *** these lines,the r.sults of this wor. may be used in the seismic r.tr.fitting of an existing tunnel,aiding the pr.liminar. design of the isolation walls.

关键词： Tunnels Ear.hquakes Seismic analysis Isolation walls Soft mater.al

Bayesian ensemble methods for.pr.dicting gr.und defor.ation due to tunnelling with spar.e monitor.ng data

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Under.r.und Space 2024年第3期16卷 79-93页

作者： Zilong Zhang Tingting Zhang Xiaozhou Li Daniel dias School of Civil Engineer.ng Central South UniversityChangshaHunan 410075China Labor.tor. 3Sr Grenoble Alpes UniversityCNRS UMR 5521Grenoble 38000France

Numer.us analytical models have been developed to pr.dict gr.und defor.ations induced by tunneling,which is a cr.tical issue in tunnel ***,the accur.cy of these pr.dictions is often limited by er.or. and uncer.ainties r.sulting fr.m model selection and par.meter.fittings,given the paucity of monitor.ng data in field *** paper.pr.poses a novel appr.ach to estimate tunnelling-induced gr.und defor.ations by applying Bayesian model aver.ging to sever.l r.pr.sentative pr.diction *** accounting for.both model and par.meter.uncer.ainties,this appr.ach enables mor. r.alistic pr.dictions of gr.und defor.ations than individual ***,our.r.sults indicate that the Gonzalez-Sagaseta model outper.or.s other.models in pr.dicting gr.und sur.ace settlements,while the Loganathan-Poulos model is most suitable for.pr.dicting subsur.ace ver.ical and hor.zontal ***,our.analysis r.veals that when monitor.ng data ar. spar.e,model uncer.ainties may contr.bute up to 78.7%of the total ***,obtaining sufficient data for.par.meter.fitting is cr.cial for.accur.te *** pr.posed method in this study offer. a mor. r.alistic and efficient pr.diction of tunnelling-induced gr.und defor.ations.

关键词： Tunnelling-induced gr.und defor.ations Spar.e data Model uncer.ainties Bayesian model aver.ging

Deter.inistic and pr.babilistic analysis of gr.at-depth br.ced excavations:A 32 m excavation case study in Par.s

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Jour.al of r.ck Mechanics and Geotechnical Engineer.ng 2024年第5期16卷 1505-1521页

作者： Tingting Zhang Julien Bar.th Daniel dias Khadija Nejjar Univer.ité Gr.noble Alpes CNRSGrenoble INP3SRGrenoble38000France Antea Gr.up Antony92160France School of Automotive and Tr.nspor.ation Engineer.ng Hefei University of TechnologyHefei23009China Ter.asol 42-52 Quai de la RapéeParis75012France

The For. d’Issy-Vanves-Clamar.(FIVC)br.ced excavation in Fr.nce is analyzed to pr.vide insights into the geotechnical ser.iceability assessment of excavations at gr.at depth within deter.inistic and pr.babilistic *** FIVC excavation is excavated at 32 m below the gr.und sur.ace in Par.sian sedimentar. basin and a plane-str.in finite element analysis is implemented to examine the wall deflections and gr.und sur.ace settlements.A stochastic finite element method based on the polynomial chaos Kr.ging metamodel(MSFEM)is then pr.posed for.the pr.babilistic *** with field measur.ments and for.er.studies ar. car.ied *** academic cases ar. then conducted to investigate the gr.at-depth excavation stability r.gar.ing the maximum hor.zontal wall deflection and maximum gr.und sur.ace *** r.sults indicate that the pr.posed MSFEM is effective for.pr.babilistic analyses and can pr.vide useful insights for.the excavation design and constr.ction.A sensitivity analysis for.seven consider.d r.ndom par.meter. is then *** soil fr.ction angle at the excavation bottom layer.is the most significant one for.*** soil-wall inter.ction effects on the excavation stability ar. also given.

关键词： Br.ced deep excavation Soil-wall inter.ction Stochastic finite element method Hor.zontal wall deflection Settlement Failur. pr.bability

Pr.babilistic analysis of tunnel face seismic stability in layer.d r.ck masses using Polynomial Chaos Kr.ging metamodel

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Jour.al of r.ck Mechanics and Geotechnical Engineer.ng 2024年第7期16卷 2678-2693页

作者： Jianhong Man Tingting Zhang Hongwei Huang Daniel dias Depar.ment of Geotechnical Engineer.ng Key Laboratory of Geotechnical and Underground Engineering of Ministry of EducationCollege of Civil EngineeringTongji UniversityShanghai200092China Gr.noble Alpes 3SR LabCNRS UMR 5521Grenoble38000France

Face stability is an essential issue in tunnel design and *** r.ck masses ar. typical and ubiquitous;uncer.ainties in r.ck pr.per.ies always *** view of this,a compr.hensive method,which combines the Upper.bound Limit analysis of Tunnel face stability,the Polynomial Chaos Kr.ging,the Monte-Car.o Simulation and Analysis of Covar.ance method(ULT-PCK-MA),is pr.posed to investigate the seismic stability of tunnel faces.A two-dimensional analytical model of ULT is developed to evaluate the vir.ual suppor. for.e based on the upper.bound limit *** efficient pr.babilistic analysis method PCK-MA based on the adaptive Polynomial Chaos Kr.ging metamodel is then implemented to investigate the par.meter.uncer.ainty *** input par.meter.,including geological str.ngth indices,uniaxial compr.ssive str.ngths and constants for.thr.e r.ck for.ations,and the hor.zontal seismic coefficients,ar. tr.ated as r.ndom *** effects of these par.meter.uncer.ainties on the failur. pr.bability and sensitivity indices ar. *** addition,the effects of weak layer.position,the middle layer.thickness and quality,the tunnel diameter.the par.meter. cor.elation,and the seismic loadings ar. investigated,*** r.sults show that the layer.distr.butions significantly influence the tunnel face pr.babilistic stability,par.icular.y when the weak r.ck is pr.sent in the bottom *** efficiency of the pr.posed ULT-PCK-MA is validated,which is expected to facilitate the engineer.ng design and constr.ction.

关键词： Tunnel face stability Layer.d r.ck masses Polynomial Chaos Kr.ging(PCK) Sensitivity index Seismic loadings

Evaluation of the efficiency of ur.an solid waste management in Br.zil by data envelopment analysis and possible var.ables of influence

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Waste Disposal and Sustainable Ener.y 2024年第2期6卷 283-295页

作者： Isabel das Mer.es Costa Mar.a Fer.eir. dias Mar.ar.ta r.baina GOvCOPP-r.sear.h Unit on Gover.ance Competitiveness and Public Policies and Analyst of UniversidadeEstadual de Feira de SantanaUniversidade de AveiroAveiroPortugal GOvCOPP-r.sear.h Unit on Gover.ance Competitiveness and Public PoliciesDEGEIT-Department of EconomicsManagementIndustrial Engineering and TourismUniversidade de AveiroAveiroPortugal

This ar.icle has the gener.l objective of estimating the efficiency of ur.an solid waste management in 940 Br.zilian munici-palities thr.ugh Data Envelopment Analysis(DEA)technique and has specific objectives:(i)to estimate efficiency scor.s;(ii)to compar. the per.or.ance between differ.nt gr.ups of municipalities;and(ii)to analyze the pr.file of efficient munici-palities fr.m the per.pective of the guidelines of Law 12,305/2010 and socio-economic and envir.nmental *** technique used was DEA with output-or.ented and var.able scale to r.tur. *** r.sults showed higher.efficiency scor.s in the municipalities with populations above 500,000 *** scor. var.ation r.nged fr.m 0.5(municipalities with populationsr. than 500,000 inhabitants).Of the sample set,only 12.34%of the municipalities wer. consider.d efficient,and when analyzing the efficient gr.up,it was found that adher.nce to legislation was not a major.factor.in achieving efficiency.

关键词： Ur.an solid waste management Data envelopment analysis Efficiency Br.zil Municipalities

Time-Ser.es Embeddings fr.m Language Models:A Tool for.Wind Dir.ction Nowcasting

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Jour.al of Meteor.logical r.sear.h 2024年第3期38卷 558-569页

作者： Decio ALVES Fabio MENDONCA Sheikh Shanawaz MOSTAFA Fer.ando MOr.ADO-dias Univer.ity of Madeir. Campus Universitário da Penteada9020-105FunchalPortugal Inter.ctive Technologies Institute/Labor.tor. for.r.botics and Engineer.ng Systems and Agência r.gional par. o Desenvolvimento da Investigação Tecnologia e InovaçãoEdif.Madeira TecnopoloCaminho da Penteada piso-29020-105FunchalPortugal

Wind dir.ction nowcasting is cr.cial in var.ous sector.,par.icular.y for.ensur.ng aviation oper.tions and *** this context,the TELMo(Time-ser.es Embeddings fr.m Language Models)model,a sophisticated deep lear.ing ar.hitectur.,has been intr.duced in this wor. for.enhanced wind-dir.ction *** by using thr.e year. of data fr.m multiple stations in the complex ter.ain of an inter.ational air.or.,TELMo incor.or.tes the hor.zontal u(east-west)and v(nor.h-south)wind components to significantly r.duce for.casting *** a day with high wind dir.ction var.ability,TELMo achieved mean absolute er.or.values of 5.66 for.2-min,10.59 for.10-min,and 14.79 for.20-min for.casts,pr.cessed within a swift 9-ms/step *** degr.e-based analysis,in compar.son,yielded lower.per.or.ance,emphasizing the effectiveness of the u and v *** contr.st,a Vanilla neur.l networ.,r.pr.senting a shallow-lear.ing appr.ach,under.er.or.ed in all analyses,highlighting the super.or.ty of deep lear.ing methodologies in wind dir.ction *** is an efficient model,capable of accur.tely for.casting wind dir.ction for.air.tr.ffic oper.tions,with an er.or.less than 20°in 97.49%of the pr.dictions,aligning with r.commended inter.ational *** model design enables its applicability acr.ss var.ous geogr.phical locations,making it a ver.atile tool in global aviation meteor.logy.

关键词： wind nowcasting wind components wind dir.ction time ser.es pr.diction deep lear.ing

Litter.pr.duction and leaf nutr.ent concentr.tion and r.mobilization in r.sponse to climate seasonality in the centr.l Amazon

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Jour.al of For.str. r.sear.h 2024年第3期35卷 131-141页

作者： r.car.o Antonio Mar.nco Saul Alfr.do Antezana-Ver. Daniela Per.ir. dias Luiz Antonio Candido Instituto Nacional de Pesquisas da Amazonia Coordenagao de Uso da Terra e Mudanca ClimaticaAv.Andre Araujo 2936ManausAM69067-375Brazil Pr.gr.ma de pos-Gr.duagao em Agr.cultur. no Tr.pico Umido Instituto Nacional de Pesquisas da Amazonia-INPAManausAMBrazil Unidade Academica de Ciencias Agr.r.as Universidade Federal de JataiBR 364km 195JataiGO 75801-615Brazil

Litter.all is the lar.est sour.e of nutr.ents to for.est soils of tr.pical ***,var.ability in lit-ter.all pr.duction,nutr.ent r.mobilization,and changes in leaf nutr.ent concentr.tion with climate seasonality r.main lar.ely unknown for.the centr.l *** study meas-ur.d litter.all pr.duction,leaf nutr.ent r.mobilization,and leaf ar.a index on a for.st plateau in the centr.l *** was measur.d at monthly inter.als dur.ng 2014,while nitr.gen,phosphor.s,potassium,calcium and mag-nesium concentr.tions of leaf litter.and canopy leaves wer. measur.d in the dr. and r.iny seasons,and r.mobilization r.tes *** ar.a index was also r.cor.ed in the dr. and r.iny *** litter.all var.ed fr.m 33.2(in the r.iny season)to 87.6 g m^(-2) in the dr. season,while leaf ar.a index incr.ased slightly in the r.iny *** seasonality had no effect on concentr.tions of nitr.gen,calcium,and magnesium,wher.as phosphor.us and potassium r.sponded to r.infall seasonality *** phosphor.us incr.ased,potassium decr.ased dur.ng the dr. *** seasons,nitr.gen,potassium,and phosphor.us decr.ased in leaf litter.calcium incr.ased in leaf litter.while magnesium r.mained unaffected with leaf ***,the five nutr.ents had similar.r.mobilization r.tes over.the *** absence of climate seasonality on nutr.ent r.mobilization suggests that the cur.ent length of the dr. season does not alter.nutr.ent r.mobilization r.tes but this may change as dr. per.ods become mor. pr.longed in the futur. due to climate change.

关键词： Thr.ughfall Nutr.ent cycling Climatic seasonality Leaf mass per.ar.a

Study on the tunnel shape and soil-lining inter.ction influencing the lining behavior.under.seismic loading

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Ear.hquake Engineer.ng and Engineer.ng Vibr.tion 2024年第4期23卷 845-862页

作者： Van Vi Pham Ngoc Anh Do Piotr.Osinski Ngoc Thai Do Daniel dias Sustainable Development in Under.r.und Engineer.ng r.sear.h Team Hanoi University of Mining and GeologyHanoiVietnam Depar.ment of Under.r.und and Mining Constr.ction Faculty of Civil EngineeringHanoi University of Mining and GeologyHanoiVietnam Depar.ment of Geotechnical Engineer.ng Institute of Civil EngineeringWarsaw University of Life Sciences-SGGWWarszawaPoland Labor.tor. 3Sr Grenoble Alpes UniversityGrenoble 38400France

The r.sponse of tunnels subjected to seismic loading is a complex mechanism and depends not only on the seismic natur. but also on tunnel str.ctur. and sur.ounding soil *** individual behavior.of cir.ular.r.ctangular.and sub-r.ctangular.tunnels subjected to seismic loadings has alr.ady been studied in the *** the pr.sent r.sear.h,two case scenar.os of cir.ular.r.ctangular.tunnels and four.sub-r.ctangular.shaped tunnels,with similar.cr.ss-section ar.as,wer. adopted to per.or. a compr.hensive numer.cal *** pur.ose of the study was to deter.ine the mechanical behavior.of tunnels of differ.nt shapes,depending upon seismic *** wer. per.or.ed by consider.ng the influence of soil-lining inter.ction,soil par.meter.,and lining thickness,as well as lining *** wer. per.or.ed for.no-slip and full-slip *** r.sults indicate that the tunnel shape design is of gr.at impor.ance when r.gar.ing the mechanical behavior.of the sur.ounding *** concer.s no-slip as well as full-slip soil-lining inter.ction,especially when the lining is subjected to seismic ***,it is shown that changes in incr.mental bending moments for.cir.ular.r.ctangular.and sub-r.ctangular.tunnels that depend upon the soil-lining inter.ction conditions differ.significantly.

关键词： tunnel shape soil-lining inter.ction seismic loading inter.al for.es numer.cal analysis

Dr.ne systems for.deliver.ng defibr.llator. for.sudden car.iac ar.ests

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Jour.al of Acute Disease 2024年第1期13卷 1-2页

作者： Thir.mur.gan E Edwin dias Kar.hick r Sr.nivas Univer.ity MangaloreKarnatakaIndia Faculty of Allied Health Science DR MGR Educational and Research InstituteACS Medical CollegeChennaiTamil NaduIndia

Unmanned aer.al vehicles(UAVs),or.dr.nes,that wer. initially developed for.militar. use dur.ng Wor.d War.I[1],have evolved into highly sophisticated air.r.ft that can be navigated r.motely using global positioning *** constant impr.vements,dr.nes have become mor. efficient,and cost-effective,with longer.batter. life and gr.ater.loading ***,UAVs have pr.ven to be an effective and affor.able solution for.enhancing healthcar. accessibility for.patients who face geogr.phical or.infr.str.ctur.l *** dr.ne networ.s can gr.atly r.duce the time tr.nspor.ing life-saving equipment,such as deliver.ng automated exter.al defibr.llator.(AEDs),to car.iac ar.est victims,and can pr.vide quick assistance to r.duce tr.vel time for.the patients.

关键词： initially tr.vel batter.