Research on Dynamics of Installation Way for Active Isolation Actuator on Flexible Foundations

The dynamic characteristic of active isolation atuator on flexible foundations was studied under the installation of parallel structure and foundation cancellation.The influencing relationships between active isolation force of the different installation ways and passive isolation system and flexible foundation were analyzed and compared.Scientific basis for selecting installation ways of active isolator is provided in this paper.     

机电设备安装工程中常见问题及对策分析

机电设备安装工程施工是一项技术领域的工作,涉及到了多个工种和多道工序,因此存在特殊的要求。文章对机电设备安装施工中存在的一些常见问题进行了分析,并为提高机电设备的安装质量提出了一些建议。     

地震作用下坝基土体液化判别及动

天津某水库坝基地面以下15m深度范围内的粉土及粉砂层属于容易发生液化的土层，直接威胁大坝的整体稳定。本文采用现场标贯试验（SPT）和室内动三轴试验对水库坝基中的粉土、粉砂层进行了液化判别，并对判别结果进行了对比分析；同时在液化判别的基础上利用有效应力动力分析方法对坝基土体进行了考虑渗流和不考虑渗流的地震液化的非线性动力有限元分析，并将液化的判别结果与现场标贯试验、室内动三轴试验的判别结果进行对比，从中得出一些有益的结论可供类似工程参考。     

黔中杨家坝大跨度预应力渡槽侧向稳定有限元分析

黔中水利枢纽一期输配水工程杨家坝渡槽单孔跨度50m,是国内最大跨度的渡槽。在风荷载等作用下的侧向稳定是关系到建筑物安全的重要指标。采用ANSYS有限元软件模拟地基条件和渡槽在复杂荷载作用下的工作情况,进行了渡槽整体侧向稳定验算,包括槽身在槽墩支座的剪切滑移稳定性和渡槽整体沿基础面的抗滑稳定性以及地基承载力。结果表明,渡槽的整体侧向稳定和地基承载力均满足要求,为杨家坝大跨度预应力渡槽经济安全设计提供了重要参考。     

基坑监测技术及其应用研究

基坑的有效监测是保证工程建设协调进行、确保工程质量的关键。介绍基坑监测技术的内容与方法,以实例说明基坑监测在工程项目中的应用及需要注意的问题,为基坑监测工作的不断完善提供有益的建议。     

THE APPLICATION OF SAND-GRAVEL-CUSHION TECHNIOUE IN THE FOUNDATION OF MOUNTAINOUS AREA

This paper presents the application of sand-gravel-cushion technique in thefoundation of mountainous area inhomogeneity and analyges non-uniformity of the foundation inmountainous,It is different from the traditional theory of sand-cushion,This is a new developmentand able to make a full use of the rock debris fill and the combinational soil-rock foundation in the mountainous areas.     

Analysis of Load-bearing Characteristics of Concrete Pile Composite Foundation

Some conclusions were drawn from two groups of in-site tests on concrete pile composite foundations. In the tests, it was found that the pressure under the rigid loading slab is different, in which the pressure under the center of the slab is the less and under the edge of the slab is the biggest. The pile-soil stress ratio is not a constant; it increases with the adding of the load. Most of the pile-soil ratio vary from 9 to 13 in these tests and the load that the piles share can be more than seventy percent of the whole load. It was proved that the bearing capacity of the concrete pile composite foundation is high with a little settlement, so it will be used more and more in the future.     

高喷灌浆在东湖水库坝基防渗处理中的应用

文章以高喷灌浆在东湖水库坝基防渗处理中的应用为例,介绍了高喷灌浆的施工工艺,施工方法以及施工质量的控制,对同类工程有一定借鉴和启发作用.     

The Element-free Method for Elastic Foundation Plates(EFM)

The application of the element-free method in the bending problems of plates has not been found since it was proposed.In this paper,the element-free method is applied to compute the deflection and the moment of the elastic foundation plate with free boundary,and the corresponding formulas as well as the computer program are developed.Numerical examples show that the accuracy of the method used in the foundation plate problem is satisfactory.Therefore,it is reasonable and feasible for using the element-free method in the plate bending problems.     

地下连续墙施工探讨

随着各种地下工程的增多,地下连续墙的使用也越来越普及。地连墙施工难度较大,施工过程中对垂直度、护壁、防渗等要求相当高。通过对以往大量地连墙工程的经验总结,对导墙、泥浆护壁、成槽、钢筋笼吊装、混凝土浇筑、接头施工等方面做了简要阐述。只有充分了解每个施工步骤、抓好每个细节,才能保证施工的安全和质量。