深海沉积物动力特性试验

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中图分类号：P733 文献标志码：A 文章编号：2095-2945（2025）24-0014-06

DOI：10.19981/j.CN23-1581/G3.2025.24.003

Abstract：Thispaperconductsanin-depthanalysisofthegeologicalconditionsof the SamarIsland-DavaoCros-SeaBridge site.Thegeologicalenvironmentoftheareaiscomplex，withseabedsedimentsupto2Ometersthick，alternatingwithmediumdensitysandlayersandhardclaylayers，andmixedwithcoralreffragments.TheareaismainlycoveredbySamarIslandcoral reflimestonewhichislessporousandcompacted.Thispaperdiscusesthedynamiccharacteristicsofsuchdeep-seasediments， focusingontherelationshipbetweendynamicstressanddynamicstrain.Aseriesofcyclictriaxialtestswerecarriedouton diferentsoilsamples（includingsiltyclaysandysiltandcementedsandmixtures）fromthedep-seaenvironmenttostudythe dynamic shear modulusanddampingratioofsoil samplesundersmallandlarge straincondions.Thetestresultsshowthat：fora smallstrainrange，thevariationlawsofdynamicmodulusanddampingratioofsoilwithtrainweremeasured;byusingstepped loadingmethod，therelatioshipuresficsrss-icstraiyamicelasticmodusdyamicstraindicear modulus-dynamicshearstrain，anddampingratio-dynamicstrainwereobtained;atsmallstrain levels，thesoilshowedapproximate elasticbehavior，andtheincreaseof strainledtoagradualdecreaseofmodulus;thedynamicshearmodulusgradualldeclined withthe increaseofdynamicshearstrain，andobviousstrainsofteningappeared.Withtheincreaseofsoildeformationdegree，the dampingratioalso increases，indicating thatthesoil islooserand theenergy dissipationcapacity isenhanced.

Keywords： coral reef limestone;dynamic performance; dynamic modulus; damping ratio; small strain

在土体的动力分析中，动应力-动应变之间的关系是描述土性的基本关系。（剩余5743字）