隧道用高抗渗耐蚀混凝土的试验研究

结合隧道工程实例，介绍环境水为软水水质条件下，对混凝土掺入适量粉煤灰和减水剂以提高混凝土的抗渗耐蚀性能进行了试验研究和机量分析，给出了双掺配合比的确定以及混凝土的制备和使用效果。     

FLAC3D前处理程序的开发及其在基坑工程中的应用*

结合FLAC3D显式差分算法在大规模岩土工程数值分析中的优势,并针对FLAC3D在复杂计算模型特别是结构模型构建方面的不足,基于HyperMesh软件平台开发了FLAC3D前处理程序。阐述了程序开发的基本思路,介绍程序中实体单元及结构单元的节点转换关系,通过内支撑围护墙和土钉网喷混凝土两种典型基坑工程实例,检验前处理程序的功能和适用性,为FLAC3D复杂计算模型的建立提供一种便捷方法。     

隧道施工废水对水环境的影响分析及防治措施

随着我国公路和隧道项目逐渐增多，隧道开挖对于周围水环境将造成一定的影响。依托莆炎高速公路三明区段文笔山1号和2号隧道项目，对于穿越水源保护区段施工所产生的废水进行水质及影响分析，并提出防治措施，旨在减少隧道施工建设对周围水环境造成的不利影响。     

Robust Spectral Estimation of Track Irregularity

Because the existing spectral estimation methods for railway track irregularity analysis are very sensitive to outliers, a robust spectral estimation method is presented to process track irregularity signals. The proposed robust method is verified using 100 groups of clean/contaminated data reflecting he vertical profile irregularity taken from Bejing-Guangzhou railway with a sampling frequency of 33 data every 10 m, and compared with the Auto Regressive (AR) model. The experimental results show that the proposed robust estimation is resistible to noise and insensitive to outliers, and is superior to the AR model in terms of efficiency,, stability and reliability.