基于离散元的土石混合体尺寸效应分析

打开文本图片集

中图分类号：TU435 文献标志码：A 文章编号：2095-2945（2025）21-0013-06

Abstract：Inordertostudytheimpactofthesizeefectoftheearth-rockmixtureandprovideatheoreticalbasisfor disasterpreventionandreductioninmountainousareasinsouthwesternChina，thebasicphysicalpropertiesandparticlegradation distributiooftheZheduoshanearth-rockmixtureweredeterminedthroughindoortests.Consolidatingandundrainedtestswere carriedoutonsamplesofdiferent sizes basedonthe PFC2Dmethod.Thedataweresortedoutandthehystereticcurveand backbonecurveofthesampleswerefitedandanalyzed tostudytheinfluenceofthesizeefectoftheearth-rockmixtureonits deformationcharacterstics.Theanalysisresultsfoundthatunderthesamestrain，thestresscorespondingtothesmallsize specimenwasgreaterthanthatofthemediumsizeandlargesize，andthedynamicshear modulusdecreasedwiththeincrease ofthesize.Comparedwiththeindoortestresults，itwasfoundthatthenumericalsimulationresultswereinlinewiththe regularity of the indoor test.

KeyWords：soil-rock mixture;size effect;deformationcharacteristics；discreteelement;numerical simulation

我国西南部地区土石混合边坡的分布相当广泛-，如在川藏公路八一至然乌段数百公里內，十分发育的大型滑坡至少有7处，严重危害了交通安全也造成了重大的经济损失，其中土石混合型滑坡有6处之多，仅易贡滑坡就有 3×108m3[3-5] 。（剩余7677字）