钱塘江复杂地层下土压平衡盾构施工技术

杭州地铁1号线越钱塘江工程盾构穿越地层复杂,除了穿越砂砾、高承压水外,还将穿越沼气富集地层,施工风险极大。该文介绍了其施工技术:通过提出轴线调整、沼气防治、渣土改良等一系列施工措施,为盾构安全顺利穿越钱塘江提供了保障。     

Variability of river plumes off Northwest Iberia in response to wind events

The Western Iberian Buoyant Plume (WIBP) is a low-salinity lens formed by river discharge and continental run-off extending along the shelf off Northwest Iberia. The variability of this structure is evaluated with a numerical model forced by real meteorological data and climatologic river discharge during late 2002, when conditions were those of a typical autumn. The direction and intensity of the wind-induced Ekman transport, but also the previous conditions and the duration of the event are found to determine plume behavior. We have identified three characteristic situations: a) confinement of the plume to the coast during downwelling — southerly-winds, b) expansion of the plume during the declining phase of the downwelling event by relaxation of the wind, and c) expansion of the plume by upwelling — northerly-winds. The short time scale of the response of the plume (1–3 h) adds timing between wind events and the phase of the tide as an additional source of variability. In all cases the Iberian Poleward Current (IPC), a saltier and warmer poleward current flowing over the slope, responds as well to wind changes. Furthermore, our simulations illustrate how topography and differences in the river discharge induce local differences in dynamics. Comparisons to available observations show a reasonable model skill. Differences between wind measurements and wind forcing applied to the model appear to be a major source of uncertainty in model results.     

跨河大跨度预应力混凝土桥的施工

该文详细介绍了大芦线航道整治一期工程18标桥梁施工过程和施工技术。叙述了河道回填、基础施工、临时锁定柱、立柱、大跨度预应力混凝土连续梁及引桥段简支梁的施工工艺。其施工工艺对类似工程的施工有借鉴意义。     

安康七里沟汉江大桥矮塔斜拉桥主梁施工技术

文章结合安康七里沟汉江大桥施工实际,介绍矮塔斜拉桥主梁施工方案及施工的关键技术,为以后类似的矮塔斜拉桥施工提供借鉴。     

荷麻溪大桥主桥主要结构参数研究

以江珠高速公路上的一座单索面部分斜拉桥——荷麻溪大桥主桥为例，通过调整其塔高和塔旁、跨中无索区长度等主要结构参数，研究各结构参数对主梁受力及位移的影响，并分析荷麻溪大桥主桥的合理塔高。     

长三角邮政快递竞争力之模糊综合评价

近几年来，在经济一体化政策的推动下，长三角地区的15个城市经济保持了平稳较快增长的良好态势。其经济的快速发展也带来快递业的繁荣，呈现出快递市场潜力大、竞争激烈、竞争焦点向价格和时限转移的特点。     

公路桥梁裂缝产生原因分析

主要探讨了裂缝在混凝土结构中产生的原因.     

北京市永定河分洪枢纽工程桥梁检测与评估

永定河分洪枢纽包括芦沟桥拦河闸和小清河拦河闸，桥梁工程包括交通桥和工作桥两部分。通过对桥梁工程缝墩的裂缝、钢筋锈蚀情况、地基承载力、缝墩的工作情况、桥梁外观进行全面检测，对桥梁的主体结构工作情况作出了判断，对维修工作提出了建议。     

孟加拉帕德玛大桥钢管桩桩侧压浆施工技术

孟加拉帕德玛大桥水中40个主墩采用直径3.0m钢管桩基础,其中11个主墩共计77根钢管桩在桩身周围均布了10道压浆槽,对每道压浆槽进行桩侧压浆,以提高钢管桩承载力。桩侧压浆水泥浆采用超细水泥配置而成,以适应密实超粉细砂地质条件。先将10道压浆槽内泥砂清除至设计标高;再布置2条线路对2道压浆槽进行同步换浆和桩侧压浆,压浆速度控制在10L/min以内,压浆压力按1,2,3MPa分级设置。压浆量达到设计压浆量或压力达到3 MPa且无法继续注浆时,继续注浆10min或保压10min,即完成该压浆槽桩侧压浆,按轮次连续完成其它压浆槽桩侧压浆。荷载试桩和工艺试桩结果表明,通过实施桩侧渗透压浆技术,可提高钢管桩与土体之间的摩阻力约58.2%,有效提高了钢管桩承载力。     

桥梁景观的内涵研究

随着现代桥梁的不断发展,仅仅满足功能性和安全性的要求,已经无法适应社会的需要。因此,桥梁美学应运而生,本文从桥梁美学的角度出发,对桥梁景观的内涵进行阐述。