Swelling Properties of Water-Swelling Materials Exposed to Organic Water Pollution

A water-swelling material is one of the rubbery impermeable materials which mixed synthetic resin elastomers as a base material, high absorbency polymers, filler and solvents. In this study, swelling characteristics of the water-swelling material on the water polluted with COD and BOD, as an impermeable material at coastal landfill sites, are examined by laboratory swelling ratio test. Furthermore, the factor in which it influences the swelling pressure of water-swelling material is clarified by measuring the swelling pressure. As the results, the COD nor the BOD concentrations in the soaked water influence the swelling ratio of the water-swelling material. When the thicknesses of water-swelling material are 2 mm and 3 mm, the maximum swelling pressure of 0.5 MPa or more that corresponds to hydraulic pressure by depth of 50 m is possessed.

高铁无砟道岔天窗内精准抬升技术研究与应用

由于复杂地质条件、区域性不均匀沉降等原因,我国部分高速铁路无砟道岔线路出现较大沉降,超出扣件可调整范围,导致其平顺性无法修复,影响列车运行的平稳性和安全性。文章从无砟道岔抬升注浆孔位、注浆材料、施工工艺、抬升对轨道结构的影响以及工程应用情况等方面进行了介绍,为今后无砟道岔沉降病害整治提供借鉴和参考。