软化水体树脂对钙离子吸附实验研究

本实验考察001x7型、D001型和D113型三种常用树脂在软化水体水质时对钙离子的吸附容量,吸附速率,抗干扰能力,以及可重复利用性进行比较,结果表明:对钙离子吸附而言,001x7型树脂具有更好的性能。

Influences of strain softening and seepage on elastic and plastic solutions of circular openings in nonlinear rock masses

Considering the influence of strain softening, the solutions of stress, displacement, plastic softening region radius and plastic residual region radius were derived for circular openings in nonlinear rock masses subjected to seepage. The radial stress distribution curve, ground reaction curve, and relation curve between plastic softening region radius and supporting force in three different conditions were drawn respectively. From the comparisons among these results for different conditions, it is found that when the supporting force is the same, the displacement of tunnel wall considering both seepage and strain softening is 85.71% greater than that only considering seepage. The increase values of radial displacement at 0.95 m and plastic softening region radius at 6.6 m show that the seepage and strain softening have the most unfavorable effects on circular opening stability in strain softening rock masses.

住区外部环境的生态设计方法

工业化使我国城市土地扩张、人口剧增更加激烈,从而加剧城市交通混乱、居住空间紧张和生活环境恶化,提高城市人居环境质量是城市可持续发展所面临的紧迫问题之一。本文建立在生态学原理研究成果的基础上,提出了住区外部环境设计的几种生态设计方法,应用在住区外部环境的场地设计、绿化配置、水体处理和硬地软化中。