边坡大变形弹塑性有限元分析[Ⅱ]

本文应用Ｕｐｄａｔｅｄ Ｌａｇｒａｎｇｉａｎ有限元分析理论,分析了石龙庙滑坡的稳定性,其中包括滑坡的大变形,初始应力和超孔隙水压力。根据土的工程地质性质,滑坡体分为四层,土层被视为是弹塑性的,土的塑性屈服采用Ｄｒｕｃｋｅｒ－Ｐｒａｇｅｒ理想塑性屈服准则,挡土墙建成前后的滑坡应力和变形被分别分析和讨论,最后根据这些分析结果,提出了滑坡的整治方案。     

煤矿井巷用PDC锚杆钻头的研究

通过对ＰＤＣ锚杆钻头的一系列室内试验研究及多次改进设计,获得了钻头的优化结构参数、优化切削齿形状,合理的钻头体材质以及热处理工艺,现场试验结果表明,ＰＤＣ锚杆钻头是钻进中硬岩层的理想钻头。     

放射性测量在岩浆岩区大比例尺填图中的应用

应用放射性地球物理手段,取得地质研究所需的地球化学数据,用以划分岩浆岩谱系单位,建立等级体制,解决岩浆岩不同序列或同一序列中众多侵入体的区分和归属,在岩浆岩区大比尺填图时划分填单位,找到了一种新的简便可行的技术方法。     

THREE-DIMENSIONAL NUMERICAL MODELING OF COHESIVE SEDIMENT TRANSPORT BY TIDAL CURRENT IN PEARL RIVER ESTUARV

IINTRODUCTIONEstUariesareprominentcoastalfeatUres.Estuariesareofgreateconomicssignificancetomankind.Attheseareas,manyharborsandwaterchannelshavetobebuiltforeconomicpurposes.ThedesignandconstrUctionofcoastalstrUctUresinestUariesrequireknowledgeofhydrodynamicsaswellassedimenttransportinsuchregions.ThenatUreofestuariesiscontrolledbyvariouscoastalhydrodynamicprocesses.Undertheactionofhydrodynamics,sedimentdepositionsorerosionswilloccurinestuariesornearcoastalstrUCtures.Tomaintainnavigati…     

Three dimensional tectonic stress field in North China

IntroductionThecrusttectonicstressfieldisoneofthekeyproblemsofgeodynamics,itsmaincontentsareaprobingintospatialdistributionanddynamicevaluationofcrusttectonicstressfield,thentracingtheevolutionprocessofcrusttectonicmovement,learningcontemporarycrusttectoniceventanditsmechanism,thuspredictingthefuturedevelopmentlawoftectonicmovement.Intheendof1970s,aseriesofpaperswerepublishedattheinternationalconferenceonMagnitudeofDeviatoricStressesintheEarth'SCrustandUppermostMantle.Theygavethebriefoutlin…     

Study on seismic numerical model on the Chinese mainland and its vicinity

IntroductionSeismicprocessisextremelycomplicatedjustashasbeenprovedbytheeallhquakepredictionpractice.Thecomplexityofseismicprocessmainlydisplaystheinhomogeneityofseismicspace-timedistribution.Therearealotoffactorscausingthecomplexity,includingthemediumofseismicsource,themechanicalprocessofseismicsource,mutualeffectofgroupseismicactivity,andsoon.Studyontheseismicactivitylawstillremainsinalowlevel,especiallyintheaspectofseismicoccurrenceprocess.Manyscholarstrytostudytheseismicactivebehavioringr…     

Monte Carlo模拟法与基坑变形的可靠度分析

将Ｍｏｎｔｅ Ｃａｒｌｏ模拟法与有限元技术结合,对基坑变形的稳定怀进行了可靠度分析,并通过重构响应面来提高Ｍｏｎｔｅ Ｃａｒｌｏ模拟法的计算效率,研究表明该方法可行,计算结果较符合实际。     

Breaking of Solitary Waves on Uniform Slopes

The propagation,shoaling and breaking of solitary waves on mild slopes are simulated byboundary element method.In this paper,the criterion of breaking solitary waves on mild slopes is discussed.The criterion is that the ratio of horizontal velocity of water particles on the wave crest to wave celerity equalsone.However,the case that the ratio of horizontal velocity of water particles on the wave crest to wave ce-lerity is below one but the front face of wave profile becomes vertical is also considered as a breaking criteri-on.According to the above criteria,the breaking index for slopes 1:10 to 1:25 is studied.The result is com-pared to other researchers'.The deformation of solitary waves on slopes is discussed and the distribution offluid velocities at breaking is shown.     

《长春市城市总体规划》图集的编辑制作

简要阐述了用MapGIS、CoreIDRAW两种软件结合制作《长春市城市总体规划》图集的设计、编制方法,采用图层模式有效管理地图集的数据．根据实践得出了一些经验和技巧。     

Implementation of DSC model and application for analysis of field pile tests under cyclic loading

The disturbed state concept (DSC) model, and a new and simplified procedure for unloading and reloading behavior are implemented in a nonlinear finite element procedure for dynamic analysis for coupled response of saturated porous materials. The DSC model is used to characterize the cyclic behavior of saturated clays and clay–steel interfaces. In the DSC, the relative intact (RI) behavior is characterized by using the hierarchical single surface (HISS) plasticity model; and the fully adjusted (FA) behavior is modeled by using the critical state concept. The DSC model is validated with respect to laboratory triaxial tests for clay and shear tests for clay‐steel interfaces. The computer procedure is used to predict field behavior of an instrumented pile subjected to cyclic loading. The predictions provide very good correlation with the field data. They also yield improved results compared to those from a HISS model with anisotropic hardening, partly because the DSC model allows for degradation or softening and interface response. Copyright © 2000 John Wiley & Sons, Ltd.