和平发展道路宽

抗日烟消六十年 东瀛倭奴死灰燃 钓岛原本华夏地 霸占领土忒凶蛮

轻质混凝土+微型桩在某临江道路拼宽中的应用

南平市水东桥改造工程B匝道路基,需要在老江滨路上进行拼宽加高。针对该工程持力层软弱、场地狭窄、交通干扰大、江水涨落剧烈等特点,设计采用轻质混凝土+微型桩方案,并应用有限元强度折减法对技术方案进行了全过程受力及变形分析,证明该技术方案安全性好、变形小而且能解决上述问题。对于边界条件复杂的工程,采用有限元强度折减法进行分析是十分有效的。

浅谈郑州黄河堤顶道路帮宽设计

文章分析论述了郑州黄河大堤堤顶道路设计宽度由6m帮宽为8m的必要性。根据道路设计标准、施工工艺、材料来源,并结合道路路面现状及以往经验,提出了5种路面结构组合。结合堤顶道路实际情况,对各堤段道路提出不同的改建方案。

宽幅城市道路交叉口设计体会

该文结合具体工程实例,对宽幅城市道路交叉口的间距,平面布置,以及立面设计进行了阐述;对交叉口的几种平面布置方案进行了比较,提出了较为合理的平面几何布置。

穿越厂区宽幅道路大直径管道施工方法

本文就厂区管道穿越宽幅度的难点进行了对策分析,并创新的采用了"双机抬吊低空转体技术",即将过路的整段管道在道路边进行焊接连接,形成整体后采用双机抬吊将预制好的管道整体旋转90°与沟槽平行,然后采用双机抬吊将管道吊装进入管道沟槽内,解决了过路管道施工长时间占用道路的重大施工难点。

基于扩展BP网络道路造价预测影响因素确定

为有效确定影响道路造价的关键因素,设计采用一种基于中心性的关键因素筛选方法,并基于BP神经网络模型分析了道路工程造价的影响因素。

Response mechanism for widened pavement structure subjected to ground differential settlement

By the use of a large-scale ground differential settlement simulator, a full-size model test is performed to study the strain response and the deformation behavior of both the wearing course of asphalt cement and the base course of cement-stabilized gravel. Moreover, with the differential settlement at the bottom of the pavement structure as the constraint condition, a plane finite element model is established, which is used to study the stress variation of different pavement layers in response to the differential settlement of varying magnitudes. It shows that, under the effects of the ground differential settlement, the wearing course is subjected to the tensile stress while the base course to the compressive stress and the maximum additional tensile stress and compressive stress occur in the area of 1 m from the splicing joint between the new and the old subgrade. Plastic deformation develops in both layers when the ground differential settlement reaches 14 cm. When the differential settlement at the bottom of the pavement goes up to 1 cm, the maximum additional stress in the surface of the base course will reach 0. 28 MPa, which surpasses 0.276 MPa that is specified in the current specifications as the maximum splitting tensile strength for cement-stabilized base material.

浅谈如何提高村组参与农村公路建设管理的积极性

习近平主席提出开展党的群众路线教育实践活动以来,从本质上体现了群众利益的第一位。全心全意为人民服务是党的根本宗旨,群众路线是党的生命线和根本工作路线,要从群众中来,到群众中去,这是群众工作的工作方法。而国家所有的政策和方针最终都要在群众身上得到落实,本文从在落实国家政策过程中,浅谈如何提高村组参与农村公路建设管理的积极性,来促使中央政策的农村公路政策得以实现。一.

Macro modeling and analysis of traffic flow with road width

The macro modeling and the solution of traffic flow with road width were investigated.Firstly,a new macro model with the consideration of road width was proposed.Secondly,the effects of road width on uniform flow and small perturbation were studied.The analytical and numerical results show that widening (shrinking) road can enhance (reduce) the equilibrium speed and flow,and the increments (decrements) will increase with the absolute value of road width gradient.In addition,the numerical results illustrate that the new model can describe the effects of road width on the evolutions of uniform flow and small perturbation.

Comparison between responses of reinforced and unreinforced embankments due to road widening

The objective of this work is to compare the responses of geosynthetically-reinforced embankment and unreinforced embankment due to road widening by using the centrifuge model tests and a two-dimensional(2D) finite element(FE) model. The measured and calculated responses of the embankment and foundation exposed to road widening include the settlement,horizontal displacement,pore water pressure,and shear stresses. It is found that the road widening changed the transverse slope of the original pavement surface resulting from the nonuniform settlements. The maximum horizontal movement is found to be located at the shoulder of the original embankment. Although the difference is small,it is clearly seen that the geosynthetic reinforcement reduces the nonuniform settlements and horizontal movements due to road widening. Thus the reinforcement reduces the potential of pavement cracking and increases the stability of the embankment on soft ground in road widening.

相对运动理论在城市交通管理中的量化计算与研究

本文基于《我国某中等城市交通状况初步调查与研究》,采用相对运动理论,又对我国某中等城市道路路宽、不同型号机动车速及行人横穿马路时间等数据进行了统计处理,通过计算得出结果。试图为城市交通、道路路宽的设计及行人安全横穿马路提供理论依据,进而为交通管理部门制定道路交通安全管理规则提供科学的量化标准。

Cellular automation model for analyzing capacity of branch road section

In order to reduce the traffic pressure of urban arterial road with the rational utilization of the branch road,the vehicle meeting behavior on the branch road without divided lane was described,and the cellular automation (CA) model was put forward by introducing meeting behavior to reflect the relation between safe meeting speed and road width.The numerical simulation results depict several relation curves between road section capacity,speed and road width under different directional distributions of traffic flow,as well as the curves between the major and minor direction saturation flow,speed and road width.These relation characteristics indicate that except the one-way road section capacity and speed remaining unchanged,other road section capacities and speeds under different directional distributions increase with the increase of road width.On narrow road,the two-way traffic capacity and speed are less than those of one-way traffic;on wide road,the two-way traffic capacity doubles that of one-way traffic,but their speeds are almost the same.As the directional distribution moves to an even distribution of 50/50,the major direction saturation flows and speeds as well as the minor direction speeds tend to decease,while the minor direction saturation flow tends to increase.

拼宽道路与新建道路在工程施工中的差异及注意事项探讨

拼宽道路的路线、等级、结构形式受原道路制约较大,工程建设环境受原道路通行影响严重。工程施工工艺、施工方法也是以道路拼宽为基础进行。拼宽道路的设计、投标、施工中涉及了许多新建道路中没有的内容。如交通组织、交通安全、道路拆除等。各单位对新建道路的设计、施工、管理较为熟悉;而目前国内拼宽道路较少,其中有许多建设内容与新建道路有所区别。因此,拼宽道路与新建道路在工程施工中存在着较多差异。

轻质混凝土+微型桩在某临江道路拼宽中的应用

随着当前社会经济的进步,我国道路建筑行业发展极为迅速,针对某临江道路拼宽工程,采取轻质混凝土和微型桩施工时所展现出的实效性较为明显,其本身所具有的施工便捷特性能够在保障工程质量安全基础上,最大限度提升工程施工效率,提高相应施工方经济效益。接下来本文将对轻质混凝土+微型桩在某临江道路拼宽中的应用,进行一定分析探讨,并结合实际对其做相应整理和总结。

The Bruce Highway Action Plan Program Evaluation

The BHAP （Bruce Highway Action Plan） Program Evaluation was a momentous task conducted in most part by the TMR （Transport and Main Roads） CBA （cost benefit analysis） team. The evaluation included 189 overtaking lanes, 404 km of road widening and shoulder sealing in various places between Brisbane and Cairns, 56 capacity focused projects and 16 flood immunity focused projects. The total projected capital costs of all projects proposed as part of the BHAP amounted to over 16 billion dollars. The program evaluation conducted, due to the short timeframes, lack of available data and strategic nature of the plan, has been ＂coined＂ a strategic evaluation. This paper focuses on the methodology applied to the projects proposed in the BHAP. A TMR designed project/program evaluation model （CARP （Concise Analysis of Road Programs） V1.0） was used to evaluate the majority of the proposed BHAP projects. The model produces streams of discounted benefits and costs of the projects and program using limited and incomplete data. The large scale of work and the close proximity of projects allowed for an integrated approach to the analysis, which considered the impact projects have on each other. The result of the program, if all evaluated projects are included, is a BCR （benefit cost ratio） of approximately 0.7l at a discount rate of 7%. If the less viable projects are removed from the program, the program can obtain a benefit cost ratio of greater than 1 with a sufficiently large number of projects remaining.

Experimental study of traffic-induced vibration of the new CCTV headquarters building

The traffic-induced vibrations of the new CCTV Headquarters building are studied stages. In the first stage when the through experiments in two 30th floor of the northwest tower and the 38th floor of the southeast tower were finished, the traffic flows on the roads surrounding the building were investigated, and 27 setups of accelerations were measured at the roadside, on the pile cap and on the 9th floor. In the second stage when the whole steel structure was completed, l 5 setups of accelerations were measured at the roadside, on the pile cap and on the 37th and the 48th floors. The accelerations of the building under different traffic flows, in different positions are analyzed in both time domain and frequency domain. The damping ratios are estimated by the upgraded half-power bandwidth method.

Factors contributing to amphibian road mortality in a wetland

To understand road characteristics and landscape features associated with high road mortality of amphibians in Zoige Wetland National Nature Reserve, we surveyed road mortality along four major roads after rainfall in May and September 2007. Road mortality of three species, Rana kukunoris, Nanorana pleskei and Bufo minshanicus, was surveyed across 225 transects （115 in May and 110 in September）. Transects were 100 m long and repeated every two kilometers along the four major roads. We used model averaging to assess factors that might determine amphibian road mortality. We recorded an average of 24.6 amphibian road mortalities per kilometer in May and 19.2 in September. Among road characteristics, road width was positively associated with road morality for R. kukunori and B. minshanicus. Traffic volume also increased the road mortality of B. minshanicus in September. Of the landscape features measured, area proportions of three types of grassland （wet, mesic and dry） within 1 km of the roads, particularly that of wet grassland, significantly increased road mortality for R. kukunori and total mortality across all three species. To most effectively reduce road mortality of amphibians in the Zoige wetlands, we suggest better road design such as avoiding wet grasslands, minimizing road width, underground passes and traffic control measures. The implementation of pub- lic transit in the area would reduce traffic volume, and hence mortality