含砂低液限粉土路基冲击压实技术研究

针对含砂低液限粉土路用性能差,常规压实方法难以达到压实度要求等施工难题,采用冲击碾压技术进行路基补压试验,获取冲压遍数、冲压沉降量等施工控制参数。通过试验确定采用沉降与面波法进行冲压质量评价,为全线推广使用冲击压实技术提供技术保障。     

武汉天兴洲公铁两用长江大桥岩溶发育段工程地质勘察

介绍武汉天兴洲公铁两用长江大桥桥址区的概况及其地质构造与地层岩性，重点评价桥址所在的场地土、场地类别及桥址地基土地震液化和震陷等场地特征，讨论岩溶对大桥的影响，提出设计和施工中需要注意的问题和处理措施。     

超声波技术在成像测井仪中的应用

主要介绍超声波技术在新一代测井技术—成像测井仪中的应用；阐述超声成像测井仪的基本工作原理、主要电路原理、成像显示处理；并介绍与电阻率成像对比的优缺点。     

双体船阻力的尾流波型测量和理论计算

本文首先以力的观点和能量耗散观点将双体船阻力进行划分,然后采用微叶轮船模粘性阻力自动化测试系统和船波自动测试系统,对各阻力成份随片体间距和速度变化而变化的规律进行研究,同时将基于线性波理论的双体船波型阻力的理论计算值与双体船波型阻力的测试值进行详细的比较,探讨线性波理论和适用性。     

反射波法在桩基检测中的应用

介绍了反射波法检测桩基完整性的基本原理、测试技术和方法,通过对检测波的识别与判断分析,阐述了反射波法在桩基完整性检测上的应用。     

公交站点交通拥挤的车流波动理论分析

公交站点是交通拥挤的常发地点。文章应用车流波动理论分析了公交站点的交通拥挤状况，分别对有公交专用道路和无公交专用道路两种情况下的交通拥挤进行了分析，并应用TSIS交通微观仿真软件对北京市西大望路上八王坟公交站点的交通状况进行了仿真研究，验证了文章的结论。     

管道超声导波检测技术

介绍了管道超声导渡检测技术的理论基础，指出了这一检测方法的技术关键；同时对现有已用于工程应用的导波检测设备与导渡检测实验系统作了描述和对比；总结了目前成熟的缺陷识别定位方法，在此基础上，对管道超声导波检测技术的广泛应用提出几点展望。     

不同桥墩形式对连续刚构桥抗震性能影响

采用大型通用有限元程序ANSYS对大跨度连续刚构桥进行三维地震动态时程分析,分析比较不同桥墩结构形式对连续刚构桥抗震性能的影响。分析结果表明:与采用双肢薄壁实心墩的刚构桥相比,采用双肢薄壁空心墩的刚构桥其位移反应更大,各构件轴力以及面内弯矩减小,而各构件的面外弯矩均增大。     

桥梁抗震CAD系统工程数据库设计

工程数据库是桥梁抗震CAD系统的核心.以现有关系数据库为基础,结合桥梁抗震设计数据存储和管理的需要,通过软件的方法新增了一些功能,使之符合桥梁抗震设计数据存储和管理的需要,完成了桥梁抗震CAD系统的工程数据库设计,为桥梁抗震设计数据的存储和管理创造了条件.     

Estimation of the response of a deeply immersed cylinder to the shock wave generated by an underwater explosion

The work presented in this paper is focused on the development of a simplified method to study the structural response of a deeply immersed cylinder subjected to the primary shock wave generated by an underwater explosion. The proposed analytical model is based on the string-on-foundation method initially developed by Hoo Fatt and Wierzbicki, who converted the two dimensional boundary value problem of a cylindrical shell to an equivalent one-dimensional problem of a plastic string on a plastic foundation. This method has already been extended by the authors to study the shock wave response of an unstiffened cylinder immersed in shallow water. The present work focuses on deep-immersed cylinders subjected to both high hydrostatic pressure and explosion shock wave. The elastic deformation energy of the cylinder under hydrostatic pressure is first calculated and used to determine the initial conditions of the dynamic problem. Cylinder deflection and plastic deformation energy are then calculated for various immersion depths. When confronted to numerical results, the proposed model appears to underestimate the increase of deflection and absorbed energy with the immersion depth. A thorough analysis of the results post-processed from Ls-Dyna/USA finite element simulations highlights a new mechanism which is due to the action of hydrostatic pressure that continues to push inward the immersed cylinder. In order to improve the analytical model, a correction factor on the hydrostatic pressure is introduced but it is finally concluded that a new mechanism dedicated to the late action of the hydrostatic pressure still needs to be developed.