大塘水库段路堤设计方案选择及实施

结合潭邵高速公路大塘水库的实际情况，针对大塘水库段路堤设计方案进行分析比较，提出采用加筋土挡土墙的方案及方案实施工艺。加筋土挡土墙的墙面位移与沉降预测结果表明此方案技术是合理可行的。     

Sampling of alternatives for route choice modeling

This paper presents a new paradigm for choice set generation in the context of route choice model estimation. We assume that the choice sets contain all paths connecting each origin–destination pair. Although this is behaviorally questionable, we make this assumption in order to avoid bias in the econometric model. These sets are in general impossible to generate explicitly. Therefore, we propose an importance sampling approach to generate subsets of paths suitable for model estimation. Using only a subset of alternatives requires the path utilities to be corrected according to the sampling protocol in order to obtain unbiased parameter estimates. We derive such a sampling correction for the proposed algorithm.Estimating models based on samples of alternatives is straightforward for some types of models, in particular the multinomial logit (MNL) model. In order to apply MNL for route choice, the utilities should also be corrected to account for the correlation using, for instance, a path size (PS) formulation. We argue that the PS attribute should be computed based on the full choice set. Again, this is not feasible in general, and we propose a new version of the PS attribute derived from the sampling protocol, called Expanded PS.Numerical results based on synthetic data show that models including a sampling correction are remarkably better than the ones that do not. Moreover, the Expanded PS shows good results and outperforms models with the original PS formulation.     

AHP在公路主枢纽站场 总体布局规划中的应用*

为使我国公路网“三主一支持”的规划建设建立在易操作,可定量化的基础上,利用简便 实用的层次分析法建立了公路主枢纽站场总体布局方案比选模型,进而对定量、定性判断矩阵分 别提出了相应的分析构成方法,并给出了比选模型的计算过程及应用实例。经实践证明,该方法 是可行的。      

华能沙尔湖至哈罗铁路哈密地区接轨方案探讨

华能沙尔湖至哈罗铁路主要为华能公司、葛洲坝公司、潞新公司规划的电厂用煤需求和矿区煤炭外运服务,也是规划建设的鄯善至烟墩铁路通道的组成部分,在路网及带动地方经济发展中将发挥非常重要的作用,研究年度运量较大.结合对社会及经济效益的影响,探讨其在哈密地区接轨方案的选择.     

Specification of the cross-nested logit model with sampling of alternatives for route choice models

We present an operational estimation procedure for the estimation of route choice multivariate extreme value (MEV) models based on sampling of alternatives. The procedure builds on the state-of-the-art literature, and in particular on recent methodological developments proposed by Flötteröd and Bierlaire (2013) and Guevara and Ben-Akiva (2013b). Case studies on both synthetic data and a real network demonstrate that the new method is valid and practical.     

The impact of route guidance,departure time advice and alternative routes on door-to-door travel time reliability: Two data-driven assessment methods

ABSTRACT

Conventional travel time reliability assessment has evolved from road segments to the route level. However, a connection between origin and destination usually consists of multiple routes, thereby providing the option to choose. Having alternatives can compensate for the deterioration of a single route; therefore, this study assesses the reliability and quality of the aggregate of the route set of an origin-destination (OD) pair. This paper proposes two aggregation methods for analyzing the reliability of travel times on the OD level: 1) an adapted Logsum method and 2) a route choice model. The first method analyzes reliability from a network perspective and the second method is based on the reliability as perceived by a traveler choosing his route from the available alternatives. A case study using detailed data on actual travel times illustrates both methods and shows the impact of having variable departure times and the impact of information strategies on travel time reliability.     

京津城际客运专线速度目标值的选择

对京津城际客运专线的速度目标值进行研究,提出了线下250km/h,线上250km/h,及线下350km/h,线上分别为300、250、200km/h四种速度目标值方案,通过线路走向、社会经济效益及投资、客运专线及高速铁路发展趋势等方面的方案比选研究,指出线下350km/h、线上300km/h为最佳速度目标值方案。     

Personal travel management: the adoption and consideration of travel‐related strategies

Traveler behavior plays a role in the effectiveness of travel demand management (TDM) policies. Personal travel management is explored in this paper by analyzing individuals' adoption and consideration of 17 travel‐related alternatives in relation to socio‐demographic, mobility, travel‐related attitude, personality and lifestyle preference variables. The sample comprises 1282 commuters living in urban and suburban neighborhoods of the San Francisco Bay Area. Among the findings: females were more likely to have adopted/considered the more ‘costly’ strategies; those with higher mobility were more likely to have adopted/considered travel‐maintaining as well as travel‐reducing strategies; and those who like travel and want to do more are less likely to consider travel‐reducing strategies. These findings, when combined with those of earlier work on this subject, present a compelling argument for the need to further understand traveler behavior – particularly in response to congestion and TDM policies.     

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基于甘肃省特殊的地理区位，通过系统分析甘肃综合交通运输现状、存在的问题、公路交通的特点和在西北地区所具有的重要作用，提出了在全面建设小康社会和构建社会主义和谐社会新的历史时期，甘肃省公路交通实现全面、协调、可持续发展的战略选择和战略实施重点。     

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