钻孔灌注桩施工事故的预防及处理

在桥梁钻孔灌注桩施工过程中经常会出现各种各样的事故,为避免其给工程带来隐患,应采取合适的方法对灌注桩事故进行预防和处理。     

保证明挖隧道防水效果应注意的几个问题

隧道渗漏往往带来结构损坏、设备腐蚀、影响外观和危害运营安全,甚至造成地面建筑物的不均匀沉降,因此保证明挖隧道的防水效果非常重要。文章从施工实践中总结出了保证明挖隧道防水效果应注意的几个问题,对类似工程具有借鉴作用。     

厦门海底隧道建设中涌水量流固耦合数值模拟

文章运用有限差分软件(FLAC3D)对厦门海底隧道F4风化深槽的涌水情况进行了流固耦合分析。由于隧道在穿越风化深槽段时采用双侧壁导洞法施工,因此对隧道施工三个阶段的涌水量分别进行了分析,并对不同注浆密度下的涌水量进行了对比。研究结果表明,在隧道开始开挖阶段,涌水量较大,之后逐渐趋于稳定;左右侧导洞开挖时,涌水量逐渐增大,但隧道中间部分开挖后,涌水量有所降低;数值计算所得涌水量结果与规范推荐公式计算结果基本一致。     

Study on Mechanism of Concrete Failure Induced by Steel Corrosion under Externally Applied Direct Current

With the combination of electrochemical corrosion due to straycurrent in running tunnels of metro, the formula to determine the corrosion products of rebars in reinforced concrete subjected to externally applied direct current is proposed, and the influence of corrosion on stress in concrete is also discussed. Meanwhile, the concept of corrosion stress field and its mathematical formula are presented in the paper. Finally the failure mode of concrete and its shortest breaking time are also analyzed.     

基于数学形态学和神经网络的车牌识别

汽车牌照的自动识别系统是一种应用于公路交通管理和收费的智能监控系统,文中提出了基于形态学处理定位牌照图象的区域的方法,该方法与其它方法相比对图像没有严格的限制和要求,三层反馈神经网络用来识别和分类,实验证明该方法是有效的。     

摆式列车液压倾摆系统的基本构成与关键技术

介绍和分析了摆式列车倾摆机构的基本构造、基本要素和关键技术,为开发研制中国具有独立知识产权的摆式列车提供参考。     

城市公交停靠站设置常见问题及对策

公交停靠站设置不合理,会导致道路通行能力的下降,针对目前城市公交停靠站设置常见的问题,根据公交线路走向、道路横断面形式及交叉口的交通状况,结合公交停靠站类型、规模与道路用地可能条件等情况,从减少公交车辆和其它非公交车辆相互干扰的角度出发,给出解决这些问题的可行方案。     

1-20 m空心板梁半幅梁体顶升工程实践

介绍了常张高速公路k127＋475分离式立体交叉1-20m空心板梁右半幅梁体顶升施工的方法和工艺流程,探讨了顶升施工在特定条件下的可行性及可操作性。     

Time control point strategy coupled with transfer coordination in bus schedule design

A schedule consisting of an appropriate arrival time at each time control point can ensure reliable transport services. This paper develops a novel time control point strategy coupled with transfer coordination for solving a multi‐objective schedule design problem to improve schedule adherence and reduce intermodal transfer disutility. The problem is formulated using a robust mixed‐integer nonlinear programming model. The mixed‐integer nonlinear programming model is equivalently transformed into a robust mixed‐integer linear programming model, which is then approximated by a deterministic mixed‐integer linear programming model through Monte Carlo simulation. Thus, the optimal scheduled arrival time at each time control point can be precisely obtained using cplex . Numerical experiments based on three bus lines and the mass rapid transit system in Singapore are presented, and the results show that the schedule determined using the developed model is able to provide not only reliable bus service but also a smooth transfer experience for passengers. Copyright © 2016 John Wiley & Sons, Ltd.     

机务联系电路设计实例分析

机务段联系电路属于计算机联锁系统的特殊结合电路.在实际工程设计中,需要结合现场情况,分析构成此类电路需要的条件,实现对进路的安全控制.本文结合成都至昆明线扩能改造工程设计实例,对其应用设计场景进行具体分析,以便对类似工程设计提出借鉴.