非线性地基上桩结构物空间分析

本文提出了桩结构物－非线性地基空间相互作用分析的迭代法和非线性有限元法。其中，桩基分析用ｐ－ｙ曲线法。结合实际结构物进行了大量的计算及比较分析，成果是令人满意的，可以付诸应用。     

造林整地排水产生水土流失及其防止措施

造林整地排水产生水土流失及其防止措施［英］Ｐ．Ａ．ＣａｒｔｉｎｇＭ．Ｓ．ＧｌａｉｓｔｅｒＴ．Ｐ．Ｆｌｉｎｔｈｅｍ１引言英国高地造林整地的常规方法是采用顺坡和横坡开沟相结合的办法进行翻耕排水。现已制订有森林排水网路的设计准则及河道管理准则，遵循这些准则...     

特征线法分析长距离输油管道的流动瞬变过程

本文建立了基于特征线方法求充动瞬变过程的数值模型，编制了针对长距离输油管道流动瞬变过程的分析软件。在数值处理上，Ｄａｒｃｙ＝Ｗｅｉｓｂａｃｈ摩擦力项用二阶精度格式来近似，因此保证了高粘度流体在流动瞬变过程分析时的计算稳定性和精确度。模型考虑了埋管地形对沿线瞬变压力的影响，当某一泵站发生水击后其它站的反应同其上控程序确定。应用该软件，分析模拟了某一长距离输油管道在中间泵站停电或末站瞬时关阀情况下的流     

一种适合于同杆4回线的故障测距方法

在对同杆4回线解耦的基础上，提出了一种适合于同杆4回线的故障测距方法。同杆4回线内部发生故障时，可以将故障分量分解为12序分量，且利用该12序分量进行故障测距。考虑到在任何故障类型下，同杆4回线内部都会存在反序分量，所以提出了基于反序环流分量的故障测距方法。当同杆4回线内部发生故障时，从线路两端计算到故障点的反序环流分量电压相等，利用该关系可以求出故障点的精确位置。由于相互独立的12序分量完全能够解决线间耦合问题，文中提出的测距算法能够精确测距，测距精度不受故障类型影响。大量ATP仿真结果表明所提出的测距算法完全适用于同杆4回线的故障测距，测距精度不受过渡电阻、系统运行方式、线路两端功角的影响。     

江口拱坝坝基渗流场有限元法分析

运用固定网格结点虚流量法及排水子结构技术，对江口拱坝坝基的防渗与排水渗控制施、两岸山体边界条件、隔水岩层阻渗及岩体成层产状等因素在影响坝基渗流场特性中的具体作用进行了计算分析。结果表明，排水子结构技术在精细求解复杂坝基渗流场中具有明显的优势，它在理论和算法上严密，完全能仿真模拟各个排水孔的几何尺寸及排水降压的真实水力行为，不仅能明显地提高计算效率，还能使渗流场的精度大大提高。     

The amenity value of woodland in Great Britain: A comparison of economic estimates

Forests produce benefits over and above the revenue yielded from timber and other wood based products. Most important among these may be the recreational benefits for visitors, which have been examined in several studies. Total benefits for residents are perhaps more accurately captured in property values since, ceteris paribus, the price of a house reflects willingness to pay to live near an environmental amenity such as a forest to gain access to it, and also the amenity (non-use) value of the forest in so far as it creates a pleasant landscape. However, the total non-priced value of forestry is not the sum of HPM and ITCM benefit estimates. Recreational benefits will typically be less, and will be subsumed in the HPM estimates, since the hedonic price is partly induced by the value of recreational access.     

THE ANALYSIS OF THE SEPARATED LAYERS ALGORITHM BY DOMAIN DECOMPOSITION METHOD

From the principle of of the Domain Decomposition Method (DDM), we analyse the 2nd-order linear elliptic partial differential problems and link the Separated-Layers Algorithm (SLA) with DDM. The mathematical properties of SLA and numerical example are presented to obtain satisfactory computation results. For general linear differential ones, also are the structure of SLA and its characteristics discussed.     

RCC斜层平推铺筑法施工质量评估

RCC混凝土斜层平推铺筑法是一项新的施工工艺,本文通过芯样测试法对该工艺进行了全面细致的质量评估。     

Excavation of Inlet Tunnels at Geheyan Power Station

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掺矿渣微粉和粉煤灰的水泥胶砂性能试验研究

 根据正交设计法,利用L24(61×41×23)正交表安排试验,探讨了混合材掺 量、矿渣微粉与粉煤灰的比例、矿渣微粉细度、粉煤灰品种对水泥胶砂流动度、7,28,90 d 龄期的抗压强度的影响,初步确定水泥熟料、矿渣微粉、粉煤灰三元体系的较优组合。结果 表明,粉煤灰与矿渣微粉双掺比单掺矿渣微粉或单掺粉煤灰的水泥胶砂,具有一定的优势。