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简介:1IntroductionTheweatheredcrustrareearthdepositsisoneofthemostsignificantrareearthdeposits,whicharemostlydistributedinsouthernChina,especiallyinthesouthofJiangxiprovince(Chietal.,2007).Thecompositionsofthesedeposits,whichareweatheredfromigneousrockssuchasgranitethroughbiological,physicalorchemical
简介:Inearthquakeproneareas,understandingoftheseismicpassiveearthresistanceisveryimportantforthedesignofdifferentgeotechnicalearthretainingstructures.Inthisstudy,thelimitequilibriummethodisusedforestimationofcriticalseismicpassiveearthresistanceforaninclinedwallsupportinghorizontalcohesionlessbackfill.Acompositefailuresurfaceisconsideredinthepresentanalysis.Seismicforcesarecomputedassumingthebackfillsoilasaviscoelasticmaterialoverlyingarigidstratumandtherigidstratumissubjectedtoaharmonicshaking.Thepresentmethodsatisfiestheboundaryconditions.Theamplificationofaccelerationdependsonthepropertiesofthebackfillsoilandonthecharacteristicsoftheinputmotion.Theaccelerationdistributionalongthedepthofthebackfillisfoundtobenonlinearinnature.Thepresentstudyshowsthatthehorizontalandverticalaccelerationdistributioninthebackfillsoilisnotalwaysin-phaseforthecriticalvalueoftheseismicpassiveearthpressurecoefficient.Theeffectofdifferentparametersontheseismicpassiveearthpressureisstudiedindetail.Acomparisonofthepresentmethodwithothertheoriesisalsopresented,whichshowsthemeritsofthepresentstudy.
简介:混合金字塔形建筑物Micropile/MSE(机械地稳定的陆地)对山脉车道合适的墙在这研究被提出:一双垂直、使道路表面倾向的micropiles从通过一面高速公路MSE墙的装填区域并且然后被抛锚进基础。堆积帽子和等级横梁被放在堆积顶上,然后一个道路障碍被连接片连接到等级横梁。MSE围全球稳定性,本地稳定性和影响道路障碍的抵抗能被这个图案同时提高。为了验证混合金字塔形建筑物micropile/MSE墙的有用性和数字方法,规模模型测试和相应数字模拟的可靠性,被进行。然后,在有micropiles的加强前后的MSE墙的地震表演通过数字方法比较地被学习。结果显示混合金字塔形建筑物micropile/MSE墙罐头有效地控制导致地震的变丑,在道路表面的微分解决,借助于micropiles和MSE的僵硬软的联合的底部和加速上的适用的压力。在有0.10.5g的振幅的地震下面的积累的排水量被36.3%46.5%减少,并且墙的顶上的加速扩大因素被13.4%,15.7%和19.3%基于分别地装载的0.1,0.3和0.5g输入地震减少。另外,在陡峭的地面的MSE墙的导致地震的失败模式是沿着backslope滑动MSE区域,当时micropiles有效地控制滑动趋势。把时刻弄弯的最大的导致地震的堆积在在MSE和斜坡基础之间的接口,因此在接口加强堆积身体的加强是必要的。因此,混合金字塔形建筑物micropile/MSE墙系统有好地震性能,这被证明。