高压旋喷桩在厦门翔安隧道陆域浅埋段施工中的应用

针对厦门翔安隧道陆域浅埋段的特点,论述了采用三重管高压旋喷桩在地表对隧道周边围岩进行预加固改良处理的施工技术,并提出相应的质量控制措施。     

Method Research on Measuring the External Costs of Urban Traffic Congestion

A main reason for congestion pricing is the external cost of congestion. Qualitative and quantitative analyses of the external costs that the urban traffic congestion brings are the basis of congestion pricing. First, this paper analyzes the production mechanism of urban traffic congestion: travelers overlook the negative externality of urban traffic congestion and then join the congested queues. Then, the external costs of traffic congestion are divided into four parts: extra travel time costs, environmental pollution costs, traffic accident costs, and fuel consumption costs. Consequently, an intensive study on the quantitative measurements for those four external costs is made. Also, a sample case is introduced to prove the feasibility of this method. It supplies a base for the implement of urban road congestion pricing and other travel demand management strategies.     

铁路定线CAD软件的研制

本文是铁路定线计算机辅助设计软件系统研究的一个阶段报告,对铁路定线 CAD 的系统设计及软件、硬件配置环境作了介绍,对其各子系统进行了说明,并给出了该系统的使用方法和步骤.     

连续配筋混凝土路面(CRCP)的施工实践

通过张(家口)石(家庄)高速公路连续配筋混凝土路面(CRCP)试验路的修筑,总结连续配筋混凝土路面(CRCP)在施工准备、钢筋安装、混凝土摊铺、端部处理等方面的施工技术要点,其结果可为其在我国高速公路中的应用提供参考.     

新疆G217线天山北坡段挡土墙破坏成因与防治

挡土墙是新疆G217线天山北坡公路重要的环境防护部分,笔者基于大量的现场调研,尤其根据公路两侧挡土墙破坏现状,概化了挡土墙的破坏类型,并就其成因进行了分析,构建了相应的有效防治技术措施.     

基于桥梁动力响应的车-桥接触力识别方法

将桥梁划分为欧拉梁单元建立桥梁的振动方程,基于拉格拉日原理建立汽车的振动方程,根据接触点处的接触力将汽车和桥梁系统耦合在一起。求解汽车-桥梁系统耦合方程得到桥梁节点动力响应,由广义正交函数和模态叠加原理确定模态响应及其导数,用正则化方法得到稳定的识别结果。数值模拟结果表明,该方法用于识别车桥接触力是有效的、可行的。     

连云港海相软土地区高速公路软基处理技术应用现状分析

为评价连云港地区高速公路软基处理技术适用性,该文先对连云港滨海相软土特点以及该地区已建高速公路的软基处理技术进行总结;然后对竣工后经软基处理的路段路基路面使用状况作现场调查,再结合统计数据和现场调查结果,阐述了该地区高速公路软基处理技术的实用性,可为该地区后续高等级公路软基处理方案的选择提供参考.     

加筋复合垫层处理软土地基施工技术

某小区8号住宅楼地基为软土地基,其承载力不能满足上部荷载的要求,决定采用加筋复合垫层进行加固处理。通过对地基承载力和沉降变形计算,以及工程竣工后的沉降观测,沉降速率和两端点倾斜值均在规范允许值范围内,经分析,沉降已经稳定,处理效果良好。     

内河高桩码头升等改造施工技术

分析了老旧码头在升等改造实施过程中遇到的主要施工难点,包括码头拆除施工、桩帽模板施工和新老结构节点施工,详细介绍了相应的解决措施及一些新工艺的应用。     

A 1.5 bit/s Pipelined Analog-to-Digital Converter Design with Independency of Capacitor Mismatch

A new technique which is named charge temporary storage technique (CTST) was presented to improve the linearity of a 1.5 bit/s pipelined analog-to-digital converter (ADC). The residual voltage was obtained from the sampling capacitor, and the other capacitor was just a temporary storage of charge. Then, the linearity produced by the mismatch of these capacitors was eliminated without adding extra capacitor error-averaging amplifiers. The simulation results confirmed the high linearity and low dissipation of pipelined ADCs implemented in CTST, so CTST was a new method to implement high resolution, small size ADCs.