顆粒形狀對(duì)循環(huán)荷載作用下砂礫石土力學(xué)特性的影響

Effect of Particle Shape on Mechanical Properties of Sandy Gravel Soil under Cyclic Loading

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中圖分類號(hào)：TU43 文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：1005-8249（2025）01-0074-08

DOI：10.19860/j.cnki.issn1005-8249.2025.01.015

PENG Jun

(Fujian Hydrogeological Engineering Geological Survey and Research Institute， Zhangzhou 3630Oo，China) Abstract：Particleshapeisoneof theimportant factors afecting the mechanical properties of sandand gravel soils.Inorderto revealthe influence lawand mechanism of particle shapeonthe mechanical propertiesofsand-gravel soil undercyclic loading， the particleflow discreteelement method wasused to simulate the cyclic shear testofsand-gravel soil.Then，bysetingup refinedcomparativeexperiments，theinfluencing factorsof particleshapeareseparatedseparately，andtheefectof particle shape on the macro - mechanical response of sand gravel soil is obtained. The results show that under a given cyclic load，the particle shape has litleefeton the meandynamicmodulus，thepeak frictionangleisreducedduetotheirrgularityof the particleshape，andthecritical frictionangleis hardlyaffctedbytheparticleshape；Ithasnoefectontheshear modulus undercyclicloading，buttheiregular particleshapewillreducethe maximum dilationangle toacertainextent；theirregular particle shape will change the slope of the e-p critical state line under cyclic loading.Larger，smaller intercept；under the actionof cyclicload，atthe mesoscopiclevel，thecontactdensityafterhomogenizationisnotafectedbytheparticleshape，the uniformcontactforcedistributionisnotaffectedbytheparticleshape，andthecontactforceanisotropyisnotafected.ffcted by particle shape.The research results help to construct a more accurate constitutive relation of sand-gravel soil.

Key words： particle shape；sand and gravel soil； cyclic load；discrete element；dilatancy

0 引言

隨著我國基礎(chǔ)設(shè)施建設(shè)的快速發(fā)展，砂礫石土因其優(yōu)異的力學(xué)特性，如高強(qiáng)度和高彈性模量，被廣泛應(yīng)用于地基換填材料、鐵路路基以及土石壩填料等工程領(lǐng)域[1-3]。（剩余12775字）