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1.
高速铁路路基工后沉降预估与控制   总被引:4,自引:0,他引:4  
研究了高速铁路路基工后沉降和复合地基,对一工程实例进行了工后沉降预测分析.研究结果表明,CFG桩复合地基能有效控制路基工后沉降;桩间距是影响控制效果的主要因素,桩间距小,则工后沉降量小,反之亦然;对CFG桩复合地基,采用设计、施工和监测等综合措施,可有效控制高速铁路路基工后沉降.  相似文献
2.
振冲碎石桩法在遂渝铁路软基处理中的应用   总被引:2,自引:1,他引:1  
随着铁路时速的不断提高,对于路基稳定性也提出了越来越高的要求。为了有效地控制软基地段路基的工后沉降和不均匀沉降,各种软基处理工法在铁路建设中得到了越来越广泛的应用。本文结合遂渝铁路的软土地基处理实例,详细地介绍了振冲碎石桩的成桩工艺,施工质量控制应注意事项,桩体及桩间土强度检测等。最后,对今后的施工和设计提出了一些建议。  相似文献
3.
Beam-track interaction of high-speed railway bridge with ballast track   总被引:2,自引:1,他引:1  
Based on the construction bridge of Xiamen-Shenzhen high-speed railway (9–32 m simply-supported beam + 6×32 m continuous beam), the pier-beam-track finite element model, where the continuous beam of the ballast track and simply-supported beam are combined with each other, was established. The laws of the track stress, the pier longitudinal stress and the beam-track relative displacement were analyzed. The results show that reducing the longitudinal resistance can effectively reduce the track stress and the pier stress of the continuous beam, and increase the beam-track relative displacement. Increasing the rigid pier stiffness of continuous beam can reduce the track braking stress, increase the pier longitudinal stress and reduce the beam-track relative displacement. Increasing the rigid pier stiffness of simply-supported beam can reduce the track braking stress, the rigid pier longitudinal stress and the beam-track relative displacement.  相似文献
4.
高铁客运专线对公路客运的影响研究   总被引:1,自引:0,他引:1  
从新昌服务区、台州服务区和宁波、温州等车站出行者的出行意愿、职业、收入及公路客运交通量和满载率、出行时间等方面,研究高铁对公路客运产生的影响。结果表明,由于高铁舒适、方便、速度快,超过60%公路出行者愿意选择高铁出行,而换乘不便、购票难、高铁班次少成为出行者不选择高铁出行的原因;高铁开通对公路客运总量没有什么影响,但使公路客运的满载率严重下降;高铁出行可以节约出行成本,使其在长距离出行占有一定市场,而短途出行,由于需要绕行等原因,不具有优势。  相似文献
5.
Wuhan Tianxingzhou Changjiang (WTC) Bridge and Nanjing Dashengguan Changjiang (NDC) Bridge are two super high-speed railway 3-trusses composite bridges. This is the first time of using three trusses in such large bridges in the world. These two types of railway floor systems of the two bridges have never been used in China before. The problem how to conform the deformations and stress levels of the railway floor system of WTC Bridge was studied. After finite element analysis and comparison, the plan of arranging one expansion stringer every two panels in railway floor system were proposed and good effect was obtained. Because of the application of three trusses, the allocation of the loads acted on the deck in three trusses is different and varies in different places of NDC Bridge. This problem was studied by model experiment and 3D finite element analysis. The results of 3D FEM analysis coincide with the model test results. The allocation rule of the loads acting on the deck in three trusses was presented. Because of the application of monolithic decks, the stiffness and structural integrity of NDC Bridge are high.  相似文献
6.
高速铁路软土路基沉降预测   总被引:1,自引:0,他引:1  
通过实测资料分析了高速铁路堆载预压软土路基沉降规律,其沉降发展过程可分为填筑阶段—恒载阶段—堆载预压阶段—卸载阶段,沉降曲线与S形成长曲线类似.利用最小二乘法,以组合模型的误差平方和最小为目标函数来确定最优加权系数,建立了加权组合预测模型.采用Origin软件分别拟合Gompertz曲线和Logistic曲线,基于组合模型思想求得加权系数,进而求得组合模型预测值.研究结果表明,加权组合模型能吸收不同单一预测模型的优点,其预测精度比单一模型更高.  相似文献
7.
Based on reasonable assumptions that simplified the calculational model,a simple and practical method was proposed to calculate the post-construction settlement of high-speed railway bridge pile foundation by using the Mesri creep model to describe the soil characteristics and the Mindlin-Geddes method considering pile diameter to calculate the vertical additional stress of pile bottom.A program named CPPS was designed for this method to calculate the post-construction settlement of a high-speed railway bridge pile foundation.The result indicates that the post-construction settlement in 100 years meets the requirements of the engineering specifications,and in the first two decades,the post-construction settlement is about 80% of its total settlement,while the settlement in the rest eighty years tends to be stable.Compared with the measured settlement after laying railway tracks,the calculational result is closed to that of the measured,and the results are conservative with a high computational accuracy.It is noted that the method can be used to calculate the post-construction settlement for the preliminary design of high-speed railway bridge pile foundation.  相似文献
8.
针对无碴轨道(以博格板式轨道为例)结构特点,提出横向有限条与板段单元动力分析新模型。将高速列车(以中华之星为例)的动车及拖车均离散为具有二系悬挂的多刚体系统,基于弹性系统动力学总势能不变值原理及形成系统矩阵的“对号入座”法则,建立高速列车-无碴轨道时变系统竖向振动矩阵方程,采用Wilson-θ法求解。分别采用传统的静力模型和横向有限条与板段单元动力分析模型,计算并比较钢轨与博格板的静、动态竖向位移最大值,得出车速为200km/h时此系统竖向振动响应时程曲线。计算结果表明,钢轨与博格板的静、动态竖向位移最大值接近,计算值均在通常值范围内,说明所提出的新模型正确、可行。  相似文献
9.
高速铁路已成为区域大城市之间联系的重要纽带.高速铁路市区段的建设对城市的发展将产生深远影响.基于合肥城市发展的特征,重点从城市空间结构的视角,对合肥城市高速铁路走向进行多方案比较研究,并提出适宜的方案.进而指出,高速铁路市区段的选线应与城市规划相协调,引导城市良好空问结构的形成.  相似文献
10.
我国高速铁路建设已经提上议事日程。当高速列车通过隧道时,由于强大的列车风的存在,隧道中工作人员的人身安全将面临危胁。本文在已知隧道断面平均风速时间过程极值的基础上,利用列车侧面风速剖面的简化模型,建立了隧道中人员安全退避距离与隧道断面底宽、风速标准等因素之间的关系,并据此提出了京沪高速铁路设计时隧道断面底宽和风速标准的建议值及与之对应的人员安全退避距离。  相似文献
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