Fundamentals of Buried Pipe Installation

WPC 2 B V J Z Courier T？X x 6 X@C X@QMS PS 800 II QMPS80II PrS x@h v？x@#|x 2 9309533确定具体目标研究的主要内容是：1)认真审视当前的管道安装实践，2)评估安装方法对管道性能的影响，以评估新方法的益处；3)确定表示相邻方法影响的基础；3)确定表示相邻原状土壤条件影响的基础；4)确定垫层备选方案及其对性能的影响；5)制定改进的压实规范，以提高施工效率。由于这些课题对管道性能有非常重要的影响，而且由于多年来工程和施工技术的变化，早期的工作已经过时，因此迫切需要拟议的新研究。将使用实验室试验来调查回填土的相容性，研究重要后部区域的土性，并调查回填土在压实过程中产生的应力和挠度。将进行现场试验，以调查在实际条件下垫层和安装方法的性质。计算机分析将被用来解释实验条件，并将适用范围扩大到未测试的条件。

WPC 2 B V J Z Courier T ? x x x x 6 X @ C X @ QMS PS 800 II QMPS80II.PRS x @ h h h h v?X @ #| x 2 9309533 Selig The specific objectives of the research are: 1) critically examine current pipe installation practice, 2) evaluate the implications of installation practices on pipe performance to assess the benefits of new methods, 3) determine the basis for representing the influence of adjacent methods 3) determine the basis for representing the influence of adjacent undisturbed soil conditions, 4) define bedding alternatives and their effect on performance, and 5) develop improved compaction specifications for more efficient construction. Because these subjects have a very important influence on pipe performance, and because the early work is out of date as a result of changes in engineering and construction technologies over the years, the proposed new research is critically needed. Laboratory tests will be used to investigate compatibility of backfill soil, to study soil behavior in the important haunch zone and to investigate stresses and deflections induced during compaction of the backfill. Field tests will be performed to investigate the nature of bedding and installation methods under realistic conditions. Computer analyses will be used to interpret the experimental conditions and extend the applicability to conditions not tested.