浅谈农村村道水泥混凝土路面裂缝的处理

论述当前农村公路村道水泥混凝土路面裂缝现象,从路基、材料、施工三个方面分析原因及处理措施。     

沥青混凝土路面不同时期病害分析及处理方法

介绍沥青混凝土路面在不同时期的病害现象,分析病害产生的原因,并提出相应的处理方法.     

压浆技术对水泥混凝土路面板底脱空的处治

板底脱空对水泥混凝土路面有很大的损坏.针对这一现象,利用压浆技术处理此类病害,投资小,见效快.     

中兴隧道断层破碎带施工处理技术

文章以中兴隧道断层破碎带施工为例,介绍了全断面帷幕注浆施工和超前小管棚的施工处理技术,并对处理后的围岩进行了监控量测,分析了围岩开裂变形现象产生的原因,提出了相应的处治措施。     

公路隧道渗漏水原因及改进工艺

通过对公路隧道渗漏水现象的调查和原因分析,从设计和施工角度提出隧道防排水的改进工艺和处理渗漏水的一些方法.     

旧路改造中桥头跳车的处理及养护

桥头跳车是普遍存在的病害现象,特别在软土路堤区域.减缓桥头跳车病害,除了在公路建设阶段采取必要的技术措施外,公路运行时期实施有效的养护处理方法十分必要.对旧路桥头跳车形成原因及处理方法等方面进行了分析和探讨.     

隧道贯通段塌方处理施工技术

文章通过公山隧道贯通段塌方处理技术的实例,从大断面隧道贯通段塌方的原因分析,介绍了隧道塌方的处理方案、施工工序等施工技术。由于本次隧道贯通段塌方的处理采取厂有效方案,保证了施工安全,处理过程中没有出现二次塌方和掉块现象,围岩和结构处于稳定状态,达到了预期的"安全、稳妥、保质、经济"的目的。其成果可供类似隧道的塌方处理参考、借鉴。     

曾经大乱 渴望大治——海南旅游客运的三个阶段

"挂靠车队"挂靠成风2001年,海南省政府为了规范全省汽车运营市场,组建了(?)车公司,要求全省所有旅游(?)挂靠到这12家公司,并在此基础上成立海南省汽车协会,该协会主管部门为海南省交通厅。这个松散型的管理体制仅负责受理服务质量投诉,不负责处理,处理的权限转交给这12家旅游车公司。但是由于旅游车公司处理总是不及时,经常发生扯皮现象,旅行社对此总是怨声载道。     

竹岭隧道左线塌方处理及防塌措施

竹岭隧道处于地质破碎带内,节理发育、岩层破碎及渗水严重,施工过程中出现塌方现象.简要介绍了隧道发生塌方的情况、处理方案及防塌技术措施.     

灌注桩的施工工艺的要点

灌注桩是桥梁施工中常见的一种施工工艺,根据不同地形、地质叙述两种灌注桩的开挖方式及灌桩时导管堵塞现象的常见原因、处理方法,和灌注桩施工时需注意的事项。     

Bounded rationality and irreversible network change

A network change is said to be irreversible if the initial network equilibrium cannot be restored by revoking the change. The phenomenon of irreversible network change has been observed in reality. To model this phenomenon, we develop a day-to-day dynamic model whose fixed point is a boundedly rational user equilibrium (BRUE) flow. Our BRUE based approach to modeling irreversible network change has two advantages over other methods based on Wardrop user equilibrium (UE) or stochastic user equilibrium (SUE). First, the existence of multiple network equilibria is necessary for modeling irreversible network change. Unlike UE or SUE, the BRUE multiple equilibria do not rely on non-separable link cost functions, which makes our model applicable to real-world large-scale networks, where well-calibrated non-separable link cost functions are generally not available. Second, travelers’ boundedly rational behavior in route choice is explicitly considered in our model. The proposed model is applied to the Twin Cities network to model the flow evolution during the collapse and reopening of the I-35 W Bridge. The results show that our model can to a reasonable level reproduce the observed phenomenon of irreversible network change.     

公路工程建设中存在的分包成因与对策

文章针对当前公路工程建设中转包分包滋生的问题,分析了其产生的原因,对如何治理公路工程建设中违规转包分包问题提出了相关的建议。     

液化天然气储运中的翻滚现象及预防措施

介绍了液化天然气储运中的翻滚（涡旋）现象及预防措施,着重分析了液化天然气在储运中的翻滚机理,提出了相应的预防措施,以减少和消除翻滚现象,提高液化天然气在储运中的安全性。     

低排量下并联甩泵分析与对策

乌鄯原油支干线乌鲁木齐输油首站低排量下给油泵特殊工况并联运行极易出现甩泵故障,给输油生产带来困扰和设备危害。通过对几年来甩泵分析,找出原因,制定对策（提高来油温度、缩小过滤器差压报警值、流量计并行、降低外输排量等）,减少了并联运行次数,避免了并联甩泵现象的再次发生,为密闭输油生产中合理配泵提供参考。     

Investigating empirical implications of hysteresis in day-to-day travel time variability

Day-to-day travel time variability plays a significant role in travel time reliability. Nowadays, travelers not only seek to minimize their travel time on average, but also value its variation. The variation in the mean and the variance of travel time (across days, for the same departure time) has not been thoroughly investigated. A temporary decrease in capacity (e.g. congestion caused by an active bottleneck) leads to a quite significant difference in the variance of travel time for congestion onset and offset periods. This phenomenon results in hysteresis loops where the departure time periods in congestion offset exhibit a higher travel time variance than the ones in congestion onset with the same mean travel time. The aim of this paper is to identify empirical implications that yield to the hysteresis phenomenon in day-to-day travel times. First, empirical hysteresis loop observations are provided from two different freeway sites. Second, we investigate the potential link with the hysteresis observed in traffic networks on macroscopic fundamental diagram (MFD). Third, we build a piecewise linear function that models the evolution of travel time within the day. This allows us to decompose the problem into its components, e.g. start time of congestion, peak travel time, etc. These components, along with their probability distribution functions, are employed in a Monte Carlo simulation model to investigate their partial effects on the existence of hysteresis. Correlation among critical variables is the most influential factor in this phenomenon, which should be further investigated regarding traffic flow and traffic equilibrium principles.     

Feedback control strategy of a new car-following model based on reducing traffic accident rates

ABSTRACT

To reduce the traffic accident death rate effectively and alleviate the traffic congestion phenomenon, this study proposes a new type of car-following model under the influence of drivers’ time-varying delay response time. Based on Lyapunov function theory, this paper reduces the traffic accident rate problem to the stability issues of the new model. By constructing suitable Lyapunov functions and using the linear matrix inequality method, the stability problem of the new car-following model is studied. The model, under the action of the controller, can effectively restrain traffic congestion. Using the traffic accident rate model proposed by Solomon, compared with the car-following model without the controller, the model under the controller shows a stronger convergence. This also means that the traffic congestion phenomenon has been effectively suppressed while greatly reducing the mortality rate of traffic accidents.     

威乌高速公路8M预制板静载试验研究

对8m预制板进行静力荷载试验,测量预制板在试验荷载作用下控制截面的应力和挠度是否满足设计要求,通过对试验检测数据和试验现象进行综合分析,对试验板做出总体评价。     

路侧隔离设施引起的路面狭窄效应研究

路面狭窄效应是一种负面的交通心理学现象,在布置交通设施时应尽量减小其对路面交通的影响.文章结合调查实例,通过计算路面狭窄效应衰减率,研究了路面狭窄效应对路面交通影响的原理与影响程度,具体探讨了路面狭窄效应与道路宽度、路侧隔离设施高度及路边建筑距离的关系.     

Percolation phenomenon in connected vehicle network through a multi-agent approach: Mobility benefits and market penetration

This paper presents an integrated multi-agent approach, coupled with percolation theory and network science, to measure the mobility impacts (i.e., mean travel time of the system) of connected vehicle (CVtio) network at varying levels of market penetration rate. We capture the characteristics of a CV network, i.e., node degree distribution, vehicular clustering, and giant component size to verify the existence of percolation phenomenon, and further connect the emergence of mobility benefits to the percolation phase transition in the CV network. We show the percolation phase transition properties to appear in a dynamic CV network with time-correlated link and node dynamics. An analytical framework was developed to evaluate the CV network attributes with varying market penetrations (MP) and connection ranges (CR) to identify percolation phenomenon in a mixed CV and Non-CV environment. In addition, a multi-agent CV simulation platform was created to further measure (1) how varying MPs and CRs affect the network-wide mobility measured by the mean travel time of the network; and (2) when percolation transition occurs in CV network to capture the critical MP and CR. Percolation phenomenon in CV network was further validated with the analytical assessments. The results show that (1) percolation phase transition phenomenon is a function of both market penetration and communication range; (2) percolation phase transitions in both mobility and CV network are highly correlated; (3) the application can reduce the average travel time of the system by up to 20% with reasonable market penetration and communication range; (4) critical market penetration is sensitive to communication range, and vice versa; (5) at least 70% of the CVs on the network are required to show in the same cluster for mobility benefits to appear; and (6) for high levels of MP or CR, a low probability of connectivity (PC) does not dramatically change the mean travel time. These results provide solid supports to create evidence-driven frameworks to guide future CV deployment and CV network analysis.     

Platooning on two-lane two-way highways: An empirical investigation

This paper presents an empirical investigation into platooning on two-lane two-way highways. The main objective is to better understand this phenomenon that has important implications on traffic performance and safety. Field data from three study sites in the state of Montana were used in this study. Separate investigations were performed to examine the relationships among platoon-related variables, namely; time headway, travel speed, and platoon size. The study confirmed that interaction between successive vehicles in the traffic stream generally diminishes beyond a time headway threshold value that fell in the range of 5–7 seconds. Also, the study revealed that very short headways (less than one second) are more associated with aggressive driving and higher speeds than with slow-moving platoons due to lack of passing opportunities. Further, the study found that amount of impedance to traffic is proportional to the size of platoon as evidenced by the relative difference between mean speed of various size platoons and the mean speed of unimpeded vehicles. The study provided other valuable insights into the platooning phenomenon on two-lane highways that are essential in developing a better understanding of traffic operation on two-lane highways.