暗挖过街通道超前大管棚施工

以深圳红岭地下通道暗挖通道B管棚施工实例，介绍了大管棚的施工流程及工艺，并结合计算机三维技术解决了小半径曲线隧道管棚设计偏角问题。     

Large bending of pipes

The computer model developed has been used successfully for studying the large pipe-bending problem frequently encountered in offshore structural engineering. The pipe-soil interaction is modelled by using the Coulomb friction law. The modified finite element approach coupled with a modified tangent stiffness procedure is used to handle the nonlinearities (geometric and material, etc.) in the problem. The material nonlinearity has been considered both by the plastic-hinge method and by an elastic-plastic method. Before studying the practical problems, sufficient check problems were analysed and a good agreement was found between theoretically exact solutions and the results obtained from the developed computer model.     

陕西柞山地区钠长碳酸角砾岩的成因及形成机制

柞山地区钠长碳酸角砾岩是流体隐爆角砾岩。岩石化学特征反映钠长碳酸角砾岩不同于沉积碳酸盐岩，而与岩浆碳酸岩基本一致。稳定同位素资料表明，钠长碳酸角砾岩的物质来源既有深源岩浆，也有基底地层。稀土元素特征反映出钠长碳酸角砾岩与岩浆活动有成因联系。在此认识的基础上，结合其地质特征探讨了钠长碳酸角砾岩的形成机制。     

老镇区污水管网系统改造实例

介绍了江南水乡古镇名胜保护区上海朱家角中心镇污水管网系统改造工程。根据老镇排水设施的现状以及老镇区具体情况,因地制宜,充分利用原有管渠,确定技术可行、经济合理的排水体制方案。叙述了结合老镇区古建筑的特点,对原合流制地区的下河滩用户污水管、出户管、截流管、截流井、外接污水管及分流制地区的出户管进行改造的设计方案和施工方案。工程采用的混合式排水体制,提高了治污率,保护了环境,节约了投资,也便于施工,符合老镇区污水管网系统的改造要求。     

浅谈隧道防排水

从设计和施工的角度论述了隧道防水设施和排水系统的设置，提出了应注意的关键问题。指出隧道防排水施工是贯穿隧道施工始终的连续作业，是保证隧道施工质量的重要环节。     

Experimental and numerical evaluation of the impact of folds on the pressure rating of CIPP liners

A cast-iron water main rehabilitated with a thermoplastic structural liner can be viewed as a hybrid pipe. Depending on the degree of corrosion of the host pipe, stress levels carried by the liner may vary significantly. Several limit states can be developed for a liner-pipe structural system. One such state is related to the presence of a longitudinal fold in a cured-in-place-pipe (CIPP) liner that coincides with gaps in the host pipe’s wall. This paper reports the results of an experimental testing and numerical modeling study undertaken to evaluate the impact of a longitudinal fold on the ability of a CIPP liner to resist internal pressures when there are significant gaps present in the host pipe’s wall. Two 3-D numerical models were constructed and validated using physical testing and the analytical solutions provided in ASTM F 2207-02. The results of a parametric study performed to estimate the stress concentration in the fold as a function of the fold’s geometry and level of applied internal pressure are also reported. An empirical approach is proposed as a basis for a guideline regarding the maximum allowable oversizing of CIPP liners in pressure pipes.     

建筑常用给水管道地震易损性试验研究

现行建筑设计规范对结构的抗震设计有着严格的要求,对非结构构件的抗震性能却缺乏足够的重视。地震后即使建筑物的结构损伤较小,也可能因为非结构构件的破坏而丧失使用功能。管道系统作为一种典型的非结构构件,是建筑实现给水、排水、消防、燃气等功能的重要保障。针对国内新老建筑中常用的PPR、镀锌钢管等建筑给水管材,以直径、水压、壁厚、加载方式为变量设计并完成24组共计72个往复加载试验。根据试验结果总结各类型管道的破坏特征和地震易损性,并通过算例介绍了试验易损性数据在管线抗震设计和分析中的应用。     

Head losses and friction factors of steady turbulent flows in plastic pipes

Many hydraulic engineering applications, which were once limited to the use of traditional materials, are progressively executed using prefabricated plastic pipes, particularly in the case of larger diameters. There is relatively little information specifically on the laws of flow resistance in plastic tubes, or that has been obtained directly for these materials. In this work, head losses and friction factors were determined experimentally in turbulent steady water flows established in conduits made of different plastics. Several pressure pipes, governed by gravity and forced, with nominal diameters until 110 mm, were used with Reynolds numbers ranging from 4E3 to approximately 6E5. Pairs of values, friction factor vs. Reynolds number, were computed and plotted using logarithmic scales. The layout of the points seems to be generally well represented by the Colebrook-White equation, for each relative roughness. Important absolute roughness variations for the different pipes were found by trend analysis. Blasius and Scimemi empirical formulas for smooth pipes were also plotted and also showed a satisfactory agreement with the experimental data, for Re up to 1E5 and a little less than 1E6, respectively.     

采用非开挖铺设高精度PE污水管的实践

江苏省太仓市污水改造工程污水管铺设的精度要求很高，而且采用的双壁空心PE管抗拉强度低，对于现有的非开挖铺管技术是一种挑战。介绍了该工程的施工难点以及设计要点，同时对施工中遇到的问题进行了分析总结。     

10-K-302C往复压缩机润滑油管路振动数值模拟分析和优化设计

新疆某石化公司的10-K-302C离心式甲烷制冷压缩机自开机以来,其润滑油管线振动位移一直较大,运用Workbench有限元软件对空管系统进行模态分析,获得管道的固有频率和振型;采用双向流-固耦合的数值模拟方法,分析对比了润滑油在耦合时的压力、速度变化及管道耦合前后的振动频率、位移变化规律;通过将数值模拟振动分析结果与实际管路实测振动结果对比,肯定了数值模拟分析的准确性,得出了共振和管内流体速度在管道弯头处突变而造成瞬间激振力过大是管道振动主要原因的基本结论;依据上述结论,对管路系统进行了减振控制,设计后的数值模拟分析表明,管系振动大幅减少,满足工业化生产要求。