空心方块斜坡堤填充块石的试验研究

采用填充块石的工程措施来减小空心方块斜坡堤空隙率的设计方法。试验研究证实了这种工程措施的可行性, 它能增强斜坡堤的导流及拦沙作用。通过不同块石级配方案及块石填充效果的对比,提出了填充块石的优化方案,此方案对空心方块斜坡堤的导流以及拦沙促淤的治理有着积极的指导意义。     

Review of the uncertainties associated to hull girder hydroelastic response and wave load predictions

This paper reviews the importance of uncertainties in hull girder loads influenced by flexible fluid structure interactions. The focus is on developments in the field of hydroelastic modelling, simulation and model tests of practical relevance to the prediction hull girder wave load predictions and their validation. It is concluded that whereas hydroelastic methods for use in design development and assessment become increasingly useful, challenges in realizing and modelling uncertainties can be attributed to: (1) the limitations of numerical methods to suitably model nonlinearities; (2) the ambiguity of model tests; and (3) the systematic use of data emerging from computational, model- or full-scale methods. An approach is recommended to assess the uncertainty in the hydroelastic responses to wave loading and an example is provided to demonstrate the application of the procedure.     

硅灰对高石粉含量机制砂制备混凝土的影响

针对天然砂日渐匮乏,而机制砂中石粉含量偏高所制备的混凝土工作性、泵送性差等问题,研究硅灰对机制砂混凝土的工作性、力学和体积稳定性的影响,并分析硅灰的作用机理。结果表明:适量硅灰可以增加混凝土工作性和稳定性,解决机制砂高石粉含量引起的混凝土黏度大和泌水问题,改善浆体微观形貌,提高混凝土力学和耐久性能,且28 d干燥收缩率400×10-6。机制砂中石粉含量为10%左右时,硅灰掺量6%~9%,制备的C50机制砂混凝土匀质性好,浆体旋转黏度约2.5 Pa·s,泌水率为0,工程应用效果良好。     

水泥稳定碎石基层在浦东道路工程中的应用

该文结合工程实例介绍水泥稳定碎石的配比设计和施工工艺。用水泥稳定碎石代替以往上海地区常用的粉煤灰三渣作为道路的半刚性材料基层,对重交通道路适用性强,有一定的推广应用价值。