型钢排架在盾构始发明挖车站结构施工中的应用

为了在北京地铁8号线鼓楼大街站主体结构完工前实现盾构后配套的组装,确保盾构早日始发,以鼓楼大街站主体结构负3层轨行区范围内中板支撑体系采用型钢排架代替满堂红脚手架。详细阐述了型钢排架的设计、验算和施工工艺,提出了安全质量控制要点和改进措施。得出： 该型钢排架支撑体系能在满足混凝土施工受力要求的前提下,为盾构后配套在车站轨行区范围内组装提供有效空间,达到缩短工期的目的,使盾构的下井组装、调试与提供始发条件的车站结构同时施工成为可能。     

目标管理视野下优化二级学院办公室管理的路径探析

文章在分析当前二级学院办公室管理中存在问题的基础上,运用目标管理理论从建立目标体系、创新管理体制机制、构建考核体系等方面提出了相应的解决措施,具有一定的指导意义。     

Part 3. Multivariate road safety models: Future research orientations and current use to forecast performance

The third part of the state-of-the-art focuses on the future of road safety modeling and on conjectures concerning the evolution of national safety indicators. In the absence of econometric developments specific to road safety modeling, the research future must rely on pre-existing statistical procedures of econometrics applied to discrete/count and to aggregate data. In terms of contents, growing interest in the heterogeneity of road accident outcomes by category of victims could lead to treatments of this issue across research streams, say by top-down and bottom-up developments, but this speculation does not rest on extant adequate formulations of the issue of road user class and victim analysis. But understanding the time profile of aggregate national performance indicators is quite another matter.     

Residential density and transportation emissions: Examining the connection by addressing spatial autocorrelation and self-selection

This paper examines the effect of residential density on CO₂ equivalent from automobile using more specific emission factors based on vehicle and trip characteristics, and by addressing problems of spatial autocorrelation and self-selection. Drawing on the 2006 Puget Sound Regional Council Household Activity Survey data, the 2005 parcel and building database, the 2000 US Census data, and emission factors estimated using the Motor Vehicle Emission Simulator, we analyze the influence of residential density on road-based transportation emissions. In addition, a Bayesian multilevel model with spatial random effects and instrumental variables is employed to control for spatial autocorrelation and self-selection. The results indicate that the effect of residential density on transportation emissions is influenced by spatial correlation and self-selection. Our results still show, however, that increasing residential density leads to a significant reduction in transportation emissions.     

船舶过桥所需航道宽度研究

为了确定船舶过桥所需要的航道宽度,通过建立基于风、流漂移的数学模型,结合我国2011年《内河通航标准》中关于航宽的计算公式,提出船舶过桥所需航宽数学模型.     

地铁施工扰动区探测及注浆效果评价

地铁施工引起土体疏松、松散和空洞,进而影响地铁运营和地铁周边建筑物的安全。为探索地铁施工扰动区探测及注浆效果评价的有效手段,介绍了SSP技术的原理和特点,并结合SSP技术在北京地铁14号线甜水园中街区段的应用实例,说明了该技术在地铁施工引起的土体扰动探测及注浆效果评价中的应用效果。结果表明： 注浆区在SSP的波速图像中表现为高速异常,扰动区表现为低速异常,根据SSP波速图像中高、低波速异常的分布可判定注浆区与地铁施工扰动区的位置与形态。该技术还具有抗干扰能力强、探测深度大和分辨率高等特点,是城市地铁施工与环境影响探测与评价的有效手段。     

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为降低高速公路货车超限率,保障高速公路的正常运行和交通秩序,计重收费政策在已在我国推广应用.本文在国内外高速公路计重收费政策研究基础上,以黑龙江省2011年11月15日计重收费费率下调为背景,结合瓦盆窑收费站的实际交通运行数据,计算了费率下调前后超限货车的价格弹性,采用理论推导与数据分析相结合的方法研究了计重收费政策下超限货车用户的行为,并提出了相关的计重收费政策实施建议,为高速公路计重收费政策在我国的健康发展提供参考.     

基于CDIO电气自动化专业人才培养模式的研究

当今高职教育普遍采用"做中学"的教学模式,CDIO工程教育模式的引入,拓宽了高职教育改革的思路。文中分析了CDIO的理念,以培养高技能应用型人才为目标,研究基于CDIO电气自动化专业的人才培养模式,对提高高职电气自动化专业办学水平有很强的指导意义。     

抛石挤淤在软土地基施工中的应用

抛石挤淤技术是软土地基加固应用比较广泛的地基处理方法。结合营口市滨海大道工程C标段抛石路基的施工实践,介绍其施工工艺及施工注意事项。     

强夯加固土石混填路堤夯沉量数值研究

强夯加固处理是山区土石混填路堤施工的有效措施,夯沉量作为施工检测的重要指标,在土石混填中研究甚少。论文采用大型有限元软件ABAQUS,建立了三维数值模型,对夯沉量随夯击次数的变化进行了系统研究。与实际工程对比,得出2 000 kN.m夯击能10击后的模拟夯击沉降量为1 158 mm,与实测结果976 mm相比,满足误差精度要求,证明了建模分析的可行性。