非饱和土边坡吸力量测的实践

为探明非饱和土天然土坡和填方土坡中吸力的变化规律，同时比较不同量测方法的效果，在湖北省枣阳市大岗坡泵站，分别用张力计、热传导探头和滤纸法进行了为期３个月的现场吸力量测。文章提交了吸力测量的结果和有关气象资料。     

土方开挖泵吸施工工艺及施工监控

采用泥浆泵进行卡口拓宽大规模土方吸运是长江堤防施工的一个新举措和新工艺。重点介绍了天宇一号段卡口拓宽工程土方开挖施工中采用的泵吸施工工艺措施及施工监控要点，并进行了分析总结。在阴雨季节，泵吸施工受气候干扰较小，工效稳定，对于确保工程进度，具有常规机械挖运无法比拟的优势，对类似条件的土方开挖，特别是对长江堤防工程中的大规模卡口拓宽土方开挖，有一定的借鉴和参考价值。     

声门下吸引导管在ICU中的应用研究

本文通过对121例气管切开的患者应用声门下吸引导管配合以间断或持续的声门下低负压吸引,很好的清除了气囊上滞留物,减少建立人工气道患者的肺部感染发生率,缩短肺部感染治愈的时间,提高了治愈率。     

沉箱预制施工技术

广西北海涠洲原油码头工程采用重力式结构与高桩式结构相结合的混合结构结构形式,文章对整个沉箱预制过程的施工技术及施工工艺进行了分析。     

沉井下沉分析

沉井的施工工艺并不复杂,施工时对邻近建筑物的影响较小,内部空间可以利用,因此在工程上,沉井有广泛的应用。文章依据长沙市北站路泵站的实例,对沉井下沉进行分析。     

A Modified SCS-CN Method: Characterization and Testing

The Soil Conservation Service Curve Number (SCS-CN) method (SCS,1956) is modified by accounting for the static portion ofinfiltration and the antecedent moisture. A volumetric analysisshows that the ratio of the potential maximum retention (S) tothe precipitation amount versus the runoff factor relation isequivalent to the average suction pressure-moisture contentrelation for a unit rainfall amount and a given soil porosity. Asimple spreadsheet procedure is suggested for determining S withuse of a 5-day antecedent precipitation amount. The modifiedmethod is found to perform well on the same data sets as used inthe National Engineering Handbook (SCS, 1971).     

下蜀土边坡降雨型滑坡的成因分析

在分析降雨型滑坡破坏模式以及下蜀土边坡稳定性影响因素的基础上,对南京典型剖面下蜀土物理力学性质进行分析,总结了下蜀土滑坡的主要成因。研究结果表明,随着降雨过程中包气带水分运移,下蜀土非饱和土体边坡内孔隙水压力和岩土界面基质吸力的分布不断发生变化,土体抗剪强度也随之不断变化,受其影响,边坡极易发生降雨型滑坡。     

CFD SIMULATION OF 3D FLOW IN LARGE-BORE AXIAL-FLOW PUMP WITH HALF-ELBOW SUCTION SUMP

1. INTRODUCTION Axial-flow pumps are usually designed for pumping large volumes of water against low pressure head. Suction sump is one of key elements in pump stations. For pumps with larger than 2 m, closed type suction sump plans are used to provide pr…     

THE INVESTIGATION OF VORTEX METHOD AND ITS APPLICATION TO DRAG REDUCTION TECHNOLOGY

BRIEF INTRODUCTION OF THE PAPER: In this paper, the vortex method, the new concept mathematical roughness introduced from the boundary condition of vortex method and the new model based on the mathematical roughness function are presented. The flow around two and three dimensional bluff bodies was investigated. The new research method about turbulence drag reduction was given in this paper. The numerical simulation about the circular cylinder started impulsively was studied. The vor…     

竖向荷载下裙式吸力基础周围土体变形研究

对饱和细海砂中传统吸力基础与裙式吸力基础开展了竖向单调加载试验和有限元模拟的对比研究,获得了基础周围砂土的变形规律及基础破坏形式,讨论了"裙"结构对基础周围土体变形的影响。研究发现:极限状态下,传统吸力基础周围土体变形范围小于裙式吸力基础周围土体变形范围,减少幅度为31%~55%,说明裙式吸力基础调动了较大范围土体发挥作用以提高其水平承载力。裙宽会引起土体的变形增大,而裙高可以对周围土体进行约束;裙宽相同时,土体变形范围随裙高的增大逐渐减小。在竖向压力荷载作用下,传统吸力基础与裙式吸力基础在砂土中的破坏形式符合Prandtl整体剪切破坏。