深海沉积物的静力特性研究

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中图分类号：TU411.7 文献标志码：A 文章编号：2095-2945（2025）20-0060-05

DOI：10.19981/j.CN23-1581/G3.2025.20.013

Abstract：Toaddressthecomplex stratigraphicconditionsandunknownstrength characteristicsofdeep-seasediments inthe areaoftheSamarIsland-DavaoCrossingBridgeinthePhilippines，thestaticpropertiesofdeep-seasedimentswereinvestigated through in-situ soil direct shear tests to obtain the cohesive force c and internal friction angle Ψ of soils in different strata，and theresults showed that： the internal friction angle of the pulverized clay soil was 18∘ ，with a cohesive force of 138.1 kPa，the cohesionofthesandysoilwasnotobvious，andtheinternalfrictionanglewasconcentratedat29.9°＼～31.7°，andtheinternal friction angle of gravelly sand specimensreached 44.7∘ . concentrated in 29.9o＼～31.7°，and the internal friction angle of gravelintercalated sand specimen reached 44.7∘ .For soils with high cohesion such as clay，cohesion occupies an important position in shearstrengthForsoilswithlargerpartclesandlowercohesion，suchassandysoils，theangleofinteralfrictionisthemain factorindeterminingtheshearstrength.Theresultsofthestudycanprovideaparametricbasisforthesubsequentsimulationof the dynamic response of bridge pile foundation.

Keywords：direct shear test； shear strength；cohesion; internal friction angle; deep-sea sediments

萨玛尔岛-达沃跨海桥梁项目位于菲律宾群岛，这一地区恰好位于欧亚板块与菲律宾海板块的交汇处，是全球地质构造最为复杂且地质灾害频发的区域之一。（剩余5632字）