复合式TBM在重庆地铁工程中的应用综述

从重庆地铁工程的特点出发,介绍重庆地铁工程的TBM选型、复合式TBM的特点及其工程适应性;并通过分析认为,在重庆地区块石性杂填土区和不良岩层地质带采用复合式TBM不仅难以发挥其优势,而且存在多种风险;结合笔者自身工程经验和类似工程经验,介绍重庆地铁工程复合式TBM的应用现状。     

上海郊区环线北段A30高速公路设计简介

结合上海郊区环线北段A30高速公路工程设计实例,简述设计人员多次深入现场调查研究,对路线走向方案、重要节点(立交)方案,作多方案比选,从而使最终确定的路线方案、立交方案、横向通道设置、软基处理方案等都比较合理、经济、实用。     

高邮湖西防汛公路施工质量检验评定浅析

泥结碎石道路施工工艺简便,造价低廉,维护方便。但由于其工艺简单,因此在水利、交通、市级等相关规范中没有具体的施工质量检验与评定标准。为此,结合工程实例,参照水利和公路工程的相关评定项目提出泥结碎石道路的施工质量检验评定标准。     

上海松江叶榭塘水利枢纽工程设计

对上海松江区叶榭塘水利枢纽工程的特征参数、平面布置与主体结构型式及枢纽运行安全控制进行了详细的阐述。设计中对枢纽功能与环境景观的和谐统一、结构优化以及实现枢纽运行自动化控制方面有充分的考虑与尝试。     

重庆石坪桥立交工程设计

对重庆石坪桥立交工程的设计创作进行了阐述,对工程特点进行了分析总结,为如何因地制宜解决城市路网重要结点交通问题提供了借鉴。     

重庆铁路枢纽东环线CTCS-2信号列控系统贯通方案研究

本文基于重庆铁路枢纽的总体规划,研究了枢纽内与东环线相关的既有、在建及拟建铁路的技术标准,结合高速铁路运输需求,对重庆枢纽东环线列控系统配置进行了分析,提出了能充分利用东环线改善枢纽内运输组织方式和提高信号系统安全的可行方案,可为进一步规划实施重庆枢纽信号系统建设提供有益参考.     

基于CRISP-DM的交通大数据分析方法及实践——以重庆市手机信令数据和RFID数据为例

随着交通大数据研究及应用日益广泛,其中存在的问题也越来越明显。很多分析结论存在概念模糊、数据质量不确定、分析方法不清晰等问题,导致分析结果经不起推敲,也缺乏可比性。究其主要原因是未能形成科学的大数据分析方法和统一的分析标准。提出基于CRISP-DM的交通大数据分析方法,包括目标要求、数据理解、数据准备、数据建模、模型验证、工程化应用(部署)6个阶段。结合重庆市交通大数据平台建设实践,以手机信令数据和车辆RFID数据为例,详细阐述数据理解、数据建模和模型验证三个重要步骤的具体做法,探索如何实现交通大数据分析的标准化、指标化和透明化。     

城市畅通工程评价数学模型研究

根据国家城市交通管理畅通工程评价指标体系,建立了一套科学的运用于城市交通管理综合评价的数学模型,同时给出了同类同等级城市间的排序方法.运用此方法对2004年30个地、州、市、县进行了试算评价,同时对同类同等级城市间的排序也进行了分析.评价结果表明,该方法具有很好的适应性,能客观地反映城市交通管理水平状况.     

Vehicle routing with roaming delivery locations

We propose the vehicle routing problem with roaming delivery locations (VRPRDL) to model an innovation in last-mile delivery where a customer’s order is delivered to the trunk of his car. We develop construction and improvement heuristics for the VRPRDL based on two problem-specific techniques: (1) efficiently optimizing the delivery locations for a fixed customer delivery sequence and (2) efficiently switching a predecessor’s or successor’s delivery location during the insertion or deletion of a customer in a route. Furthermore, we conduct an extensive computation study to assess and quantify the benefits of trunk delivery in a variety of settings. The study reveals that a significant reduction in total distance travelled can be achieved, especially when trunk delivery is combined with traditional home delivery, which has both economic and environmental benefits.     

Getting around a license-plate ban: Behavioral responses to Mexico City’s driving restriction

License-plate-based driving restrictions are among the highest profile policies for local governments to address congestion and air pollution. Cities as varied as Sao Paulo, Paris, Tianjin, and New Delhi have enacted temporary or permanent restrictions to improve local air quality. Using household travel survey data and a research design based on the abrupt shift in how the policy applies to 10-year-old vs. 9-year-old vehicles, we evaluate the impact of Hoy No Circula, one of the earliest and most studied driving restrictions, in Mexico City. In line with previous studies, we find that Hoy No Circula has done little to reduce overall vehicle travel, but we reject the prevailing theory that its lack of success is due to perverse incentives for households to buy second cars. Instead, we highlight the range of other, less costly ways that people adjust behavior to avoid the restrictions. Although no single behavior dominates, most households — particularly those that own older, higher-polluting vehicles — do not use their car every weekday regardless of the restriction. As a result, it is relatively easy to shuffle travel from restricted days to unrestricted days and thus avoid the ban. Shuffling travel days is less costly, more immediately available, and far simpler for most households than buying a second car.