Laplace变换解双层地基固结问题   总被引：1，自引：0，他引：1  

王新辉  缪林昌  高健康  赵 《岩土力学》2005,26(5):833-836

连云港地区的软土是海相淤泥和淤泥质土.在连云港软土地区修筑高速公路时,通常采用水泥土搅拌桩地基处理方法使路基强度和变形满足工程的要求.该类软土压缩沉降量大,排水固结缓慢,地基稳定性差,造成高速公路建设中及建成后工程问题频繁出现.从江苏海相软土的工程实例出发,将经水泥土搅拌桩处理后的高速公路路基简化为双层地基,借助Laplace变换求解了二级加荷下的双层地基一维固结问题,为克服对固结方程进行Laplace逆变换的困难,在Laplace逆变换中运用Stehfest算法进行数值求解,该双层地基固结沉降计算结果与实际观测数据基本一致.  相似文献   

初春暴雪过程的多普勒速度特征分析   总被引：2，自引：0，他引：2  

薛 《山东气象》2004,24(3):6-8

利用多普勒雷达资料对烟台市一次初春暴雪天气的多普勒速度和风场结构特征进行了分析。结果表明：降雪开始后相继出现的暖平流辐合、闭合零速度区和逆风区是本次暴雪天气过程多普勒速度的主要特征；持续的垂直风向切变及强辐合等风场结构为暴雪产生创造了条件；低空东南气流对多普勒速度特征的形成及暴雪的产生起了主导作用。  相似文献   

EFFECT OF SUSPENDED SEDIMENT ON THE TRANSPORT AND TRANSFORMATION OF 4 - NITROCHLOROBENZENE IN THE YELLOW RIVER     

SHEN Xianchen 《国际泥沙研究》1997,(1)

I.INTaonUCTIOXP-NCBisatoxiccompoundwhichmaycausecarcinogenicoramutation.NowthetransPOrtandtransformationofthiskindOfsubstanceinnaturalwaterbodyisthefocusofresearchofscientistsintheworld.ThroughthestudytherelationshipbetweennonionicorganiccomPOunds,suchasP-NCB,andsuspendedsedimentisfoundtobeveryclOSe,suspendedsedimentareload-supPOrtingofmovementandmediateagentofreactionofP-NCBinwater.TheYellowRiverisheavilysediment-laidenriverintheworld.Sometimesthesuspendedsedimentcanbeupto200kgpe…  相似文献   

ENERGY DISSIPATION AND CALCULATION OF RESISTANCE AND VELOCITY OF DEBRIS FLOW     

FEI Xiangjun  XIONG Gang 《国际泥沙研究》1997,(1)

I.I~rnoxTherearemanyproblemsfortheresearchondebrisflowmechanism.ThemostimPOrtantandmOSturgentoneisthecalculationofresistanceandvelocityOfdebrisflow.Inthisaspectmuchresearchhasbeencompletedfromtwoapproaches.Oneapproachisbasedonordinaryhydraulicsandmodifiedbyfieldobservationdata,andempiricalformulaeofdebrisflowresistanceandvelocitywereestablished.MOStoftheearlyresearch,suchascalculatingdebrisflowvelocitywiththemodifiedformOfMariningformula,belongedtothisscope.Theonlydifferenceisthattherough…  相似文献   

SEDIMENT CONTROL MEASURES IN SERIOUS SOIL EROSION REGION IN CHINA     

CAO Wenhong  Senior Engineer  China Institute of Water Resources  Hydropower Research 《国际泥沙研究》1997,(3)

I.INTRODUCTIONSoilerosionareasinChinasearchto3.67millionkm'whichoccupies38.2%OfthewholeareainChina.Thesoilerosionregionisspreadingovertheti)holecountry.Amongthat,soilerosionbyrainfallistermedas"watererosion"whichisdistributedinmountainsandhillarea.soilerosionbywindistermedas"winderosion",mainlydistributedinareasalongtheGreatWall,soilerosionbyfreezeandmeltistermedas"freezeerosion",mainlydistributedinhighmountainarea.Inthepastfortyyears,manyintegrateharnessmeasureshavebeenaPPliedindiffer…  相似文献   

地形对地表二向性反射测量的影响(英文)     

Shunlin Liang  《遥感学报》1997,(Z1)

该文重点研究不同空间分辨率下粗糙地表的表面二向性反射测量。这里将不同二向阴影函数和计算机模拟技术进行了对比，所用到的计算机模拟技术包含射线追踪和基于人造表面和３０ｍＤＥＭ数据的辐射通量法等。所有算法都显示出地形对辐射度量有显著影响，然而，它们同时揭示了诸多模型之间存在着很大的差异，如果想准确估计地形对二向性反射分布函数的影响，就必须做进一步的研究。  相似文献   

Responses of soil nutrient to driving mechanism in Taihu Lake basin in last 20 years     

CHEN Fu  PENG Bu-zhuo  BAO Hao-sheng 《地理学报(英文版)》2001,11(1):92-98

1 IntroductionPopulation growth and economic development aggrandizes day by day pressure on land resources, which results in serious land degradation and environmental pollution[1]. The status and management of land resources has become one of the highlights of global soil study[2]. Human-induced soil changes and their effects on human lives and eco-environments have received extensive attention[3-7]. Improving soil quality is one of the most important factors for sustaining the global biosphe…  相似文献   

Environmental and ecological water requirement of river system: a case study of Haihe-Luanhe river system   总被引：4，自引：0，他引：4  

LI Li-juan  ZHENG Hong-xing 《地理学报(英文版)》2001,11(2):224-230

1 IntroductionRiver system, to some extent, can be regarded as an independent eco-system, which includes river channels, lakes and the lands near the water bodies. In the engineering view, river system can be defined as the flooded area with a flood frequency of 1%[1,2]. The major aspects of the river system may be its water quantity, water quality and aquatic species. The three aspects of the system have a close relation with each other. The river system has a lot of functions, of which in g…  相似文献   

Evolution　of　Circum－Pacific　Basins　andVolcanic　Belts　in　East　China　and　Their　Geodynamic　Background   总被引：7，自引：0，他引：7  

Li Sitian 《中国地质大学学报(英文版)》1995,(1)

Ｅｖｏｌｕｔｉｏｎ　ｏｆ　Ｃｉｒｃｕｍ－Ｐａｃｉｆｉｃ　Ｂａｓｉｎｓ　ａｎｄＶｏｌｃａｎｉｃ　Ｂｅｌｔｓ　ｉｎ　Ｅａｓｔ　Ｃｈｉｎａ　ａｎｄＴｈｅｉｒ　Ｇｅｏｄｙｎａｍｉｃ　Ｂａｃｋｇｒｏｕｎｄ￥ＬｉＳｉｔｉａｎ（ＦａｃｕｌｔｙｏｆＥａｒｔｈＲｅｓｏ...  相似文献   

Petrogenesis　of　Eclogites　in　the　Light　of　Punctuated　Metamorphic　Evolution　in　Dabie　Terrane，China     

You Zhendong  Han Yujing  Zhong Zengqin  Sang Longkang  Chen Nengsong  Zhang Zeming 《中国地质大学学报(英文版)》1995,(1)

Ｐｅｔｒｏｇｅｎｅｓｉｓ　ｏｆ　Ｅｃｌｏｇｉｔｅｓ　ｉｎ　ｔｈｅ　Ｌｉｇｈｔ　ｏｆ　ＰｕｎｃｔｕａｔｅｄＭｅｔａｍｏｒｐｈｉｃ　Ｅｖｏｌｕｔｉｏｎ　ｉｎ　Ｄａｂｉｅ　Ｔｅｒｒａｎｅ，Ｃｈｉｎａ￥ＹｏｕＺｈｅｎｄｏｎｇ；ＨａｎＹｕｊｉｎｇ；ＺｈｏｎｇＺ...  相似文献