颗粒形状对循环荷载作用下砂砾石土力学特性的影响

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

打开文本图片集

中图分类号：TU43 文献标志码：A 文章编号：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

随着我国基础设施建设的快速发展，砂砾石土因其优异的力学特性，如高强度和高弹性模量，被广泛应用于地基换填材料、铁路路基以及土石坝填料等工程领域[1-3]。（剩余12775字）