抛石层灌注桩施工新工艺的应用

抛石层灌注桩施工工艺的应用填补了国内灌注桩施工的一项空白,它具有操作简便、确保成孔质量、设备简单、工期短、成本低等特点。取芯注浆是该工艺的核心工序。它的应用为今后同类地质条件下的灌注桩施工提供了经验。     

百色-罗村口高速公路沥青路面施工控制要点

文章结合广西百色-罗村口高速公路施工工程实例,分析了广西高速公路沥青路面施工中存在的主要问题,提出了高速公路沥青路面施工控制要点,对我国南方地区高速公路沥青路面施工具有一定的参考价值。     

化学灌浆处理水泥砼路面板底脱空方法

文章针对广西柳州-王灵高速公路水泥砼路面板底存在脱空问题,分析了病害产生的原因,介绍了应用化学灌浆处理时从灌浆材料、设备的选定,到施工工序,质量检查,处理效果及方法的过程,提出了处理工程中还存在的问题及对策,对处理水泥砼路面板底脱空及改善路面的使用性有一定的参考意义。     

拱桥吊杆变形差异引发桥面断裂及类似事故的预防措施

对四川省宜宾市南门大桥发生断裂事故的原因进行了分析和探讨，并对中承式肋拱桥预防类似事故的发生提出了建设性意见。     

城市河涌整治中降低泄洪河道最高洪水位的途径

流经城区的泄洪河道往往在雨季造成水渍 ,产生不同程度的财产损失。降低河道暴雨时的水位是城市防洪的重要任务之一。下面以流经广东省中山市城区的白石涌整治为例 ,淡谈在城市防洪工作中怎样有效降低泄洪河道的洪水位     

信息管理与信息化

本文主要介绍武汉市水务局在信息设施建设方面取得的成果 ,并阐明笔者对水务防汛信息管理的见解     

喷撒颗粒的增粘机理研究

本文建立了向轮轨接触间喷撒颗粒时的摩擦模型，并将此摩擦模型应用于修正的轮轨粘着理论中，对喷撒颗粒的增粘机理进行了理论研究。从理论计算结果可以看出，向轮轨接触间喷撒颗粒的增粘效果是非常明显的，且增粘效果和轮轨的表面状态、颗粒的质量和进入轮轨接触面间的颗粒数量有关。     

Non-commuters: the people who walk to work or work at home

The paper focuses on the socioeconomic characteristics of workers at home and those who walk to work and these are compared with commuters (those who travel to work by motorized transportation). Understanding of such characteristics of these people is useful for purposes of designing policies that encourage these forms of "travel" to work, if it is believed desirable for planning or environmental purposes. For example, subsidizing public transportation may also have an impact on the proclivity to work at home or walk to work. Using a large census data set for Israel, separate subsamples are analyzed for heads of household and for their spouses. Metropolitan areas as well as peripheral urbanized areas are analyzed separately. Logit analysis is used to identify those variables that affect the likelihood of different groups of people to walk to work or to work at home.It is shown that walkers to work tend to be lower-income, less-educated people with lower asset ownership rates. Females are overrepresented amongst them, while "high-status" professionals are underrepresented. Workers at home appear to be a more complex group. They tend to have higher levels of education and wealth than commuters, but earn less on average. They include proportionately more females. The likelihood of working at home increases with home size and with ownership of some durable goods. The workers at home may in fact be comprised of two or more differing groups with contrasting characteristics, one higher-income and higher-educated, the other with lower socio-economic indicators. Because they may be a heterogeneous group, development of planning policies to encourage non-vehicle commuting may require different policy tools for the different subgroups.     

车辆侧翻的运动力学分析及预防措施

车辆转弯发生侧翻是最常见、最严重的交通事故之一。对车辆转弯的4种运动状态进行了力学分析，对“车轮下的奇迹”进行科学的压力测算，提出了防止车辆侧翻的具体措施。     

耗能防撞装置在桥墩基底摇摆隔震中的性能研究

在桩基桥墩基底摇摆隔震中，提出一种增加柔性耗能防撞装置设计方案。当罕遇地震发生时，桥墩在与基础分离处发生摇摆，与设计的防撞装置发生碰撞，延长了系统的撞击时间，使撞击力下降。利用多个钢绳柔性防撞圈同期作用的动态有限元方法建立模型，对防护围刚度分三种情况进行讨论，发现在撞击防撞装置的过程中，前期为部分防撞圈发挥作用，后期为全部防撞圈发挥作用，且“同期作用历时”越短越好。分析结果表明，降低防撞构件的初始刚度，可延迟最大撞击时间，同时可减小最大的撞击压力。