协调发展理论:城市规划管理新视点

协调发展观要求经济结构与自然结构相符合,并在此基础上争取社会经济发展计划不断适应生态系统的动态平衡,以求人类社会的良性运行和持续稳定发展。在新世纪新阶段,要提高执政能力,加快城市发展步伐,提高城市综合竞争力,必须坚持以科学发展观为指导,以经济建设为中心,抓好经济发展的同时,坚持以人为本,努力实现全面协调可持续发展,坚持正确处理六种关系。     

桥上无缝线路附加伸缩力的远程监测与分析

针对高速铁路长大桥梁无砟轨道无缝线路这一复杂体系,以国内某高速铁路建设为背景,通过对该高速铁路长大桥梁无砟轨道无缝线路的试验研究,研制了高速铁路长大桥梁无砟轨道无缝线路长期、远程和实时监测系统。利用远程监测所得到的应变,推导了伸缩附加力的计算公式。运用该方法对某高速铁路长大桥梁无砟轨道无缝线路进行了监测,试验结果验证了监测系统的可行性和有效性。     

Duffing系统对称破缺分岔及其逆分岔研究

研究了Duffing系统中作为倍周期分岔前兆的对称破缺分岔及其机理,Lyapunov指数与对称破缺分岔之间的关系．研究表明对称破缺分岔意味着仅含奇次谐波周期解的失稳和稳定的含有奇、偶次谐波周期解的出现,而且在此临界稳定点应有最大Lyapunov指数等于零．通过数值计算发现,在达到倍周期分岔前最大Lyapunov指数经历了3个零点,对应于系统的两次对称破缺分岔和一次逆对称破缺分岔,并确定了分岔点的,值。     

Transverse Vibration of Train-Bridge and Train-Track Time Varying System and the Theory of Random Energy Analysis for Train Derailment

Summary In this paper, the fundamental problems in the calculation of transverse vibration of train-bridge and train-track time-varying system (hereinafter referred to as the system) are expounded. That is, (1) Proper solution to transverse vibration of the system cannot be obtained by establishing separate transverse vibration equation groups for the car and the bridge (or track); (2) The exciting source of transverse vibration of the system has not been made definite; (3) It is difficult to carry out the random analysis of vibration of the time varying system as the theory of the random vibration analysis for the time varying system has not been established. Our thinking and methods to solve these problems are introduced. On the above-mentioned basis, the theory of random energy analysis for train derailment is presented. The main contents of this theory are as follows: method of random energy analysis of transverse vibration of the system; geometric criterion of derailment; mechanism of derailment caused by the combined track irregularity and energy increment criterion for derailment evaluation; calculation of the entire derailing process; method of improvement of track parameters for preventing straight line speed-raise freight trains from derailment and of the calculation of the safety coefficient against derailment. This theory is used to calculate a case of freight train derailment, which corresponds to an actually occurred accident. A train in another derailment test is judged to be not derailed and its maximum vibration responses are calculated. The field test results are well responded.     

都市圈公共交通服务品质提升策略 ——以金华—兰溪城际公交快线为例

都市圈毗邻城市间高品质、高竞争力的公共交通服务在提升公共交通出行分担率的同时,还有助于形成重点车站核心区+公交走廊引导的点—轴发展模式,摆脱传统的小汽车依赖的蔓延式增长路径.以金华—兰溪城际公交快线为例,分析乘客出行特征以及城际公交快线服务与居民需求的匹配关系,总结现有服务在应对多元需求及车站环境设计中的问题.基于交通...     

Influence of Pit Foundation Excavation on an Adjacent Metro北大核心CSCD

With the development of urban metro systems, the influence of foundation pit construction on metro fa-cilities and related protection measures are getting more and more attention. A technical program for metro assess-ment at different phases of foundation pit construction is proposed using the statistics and analysis of a foundation pit of the Hangzhou metro. Qualitative and quantitative methods for analyzing the influence that foundation pit exca-vation has on metro systems are studied, and a series of protective measures suitable for foundation pit construction are summarized. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

高压旋喷扩底桩在桥台软土路基中的应用分析

针对某高速公路桥台软土路基工程地质情况,对高压旋喷注浆设计程序、扩底桩选型、设计桩长确定与设计计算方法进行了探讨,其中设计计算主要包括承载力与沉降计算。并介绍了高压旋喷扩底桩施工工艺及施工质量控制措施。     

水泥搅拌桩在天津沿海软基加固中的应用

水泥搅拌桩在软土地基加固工程中应用非常广泛，但在不同地质条件下其设计参数和施工工艺不同，结合天津市重点工程天津碱厂搬迁改造及华能绿色煤电IGCC电站铁路专用线工程对水泥搅拌桩的设计参数和施工工艺进行了现场试验，取得了合理的施工方案，对类似工程有较好的参考价值。     

编组站CIPS系统的调度计划管理

调度计划管理是编组站综合集成自动化系统的核心部分，本文阐述了编组站调度计划管理的原则和方法，并在此基础上将MAS具体应用于调度计划管理，在实时和优化之间取得一个比较好的平衡，满足了编组站调度计划的动态调整要求，取得了良好的效果。     

大断面隧道工程补充单价分析编制方法的探讨

随着高速铁路、客运专线建设被提上议事日程，目前铁路建设标准不断提高，隧道断面随铁路速度目标值的提高而增大。现行隧道单、双线定额已不适用于新隧道结构，需尽快颁布出台大断面隧道定额。此针对大断面隧道工程在暂无定额可用的情况下，对大断面隧道工程补充分析编制方法进行探讨和分析。