桥梁混凝土裂缝分析

从混凝土常见裂缝特性、成因着手,论述了各种裂缝的防治措施,并提出简单的裂缝修补方法.以便工程技术人员能够对症下药,尽量避免工程中出现危害较大的裂缝.     

Property Evolution of Sulphoaluminate Grouting Material under Pressure Circulation北大核心CSCD

Water-sealed underground oil tank projects are quite different from traditional underground projects since the water-sealing conditions are very strict and the difficulties caused by the geological specificity, structural specificity and construction specificity are key factors affecting the project. In light of the significant early initial setting time and rapid temperature increase of sulphoaluminate cement-based grouting material for a large domestic water-sealed underground oil tank with pressurized cyclic grouting, a laboratory grouting simulation is conducted. It is found that the properties of the sulphoaluminate cement-based grouting material are quite different under different pressure cycles, the hydration exothermic peak time gets shorter with an increase of circulation time, the compressive strength decreases with an increase of circulation time, and the longer the circulation time the more obvious the de-crease of compressive strength. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

对水浸法测定沥青与石料粘附性的探讨

新规程（ＪＴＪ０５３—９２）中关于检验沥青与石料（粒径＜１３．２ｍｍ）粘附性的水浸法试验难以精确进行。为此，在分析了水浸法试验不足的原因后，对粒径小于１３．２ｍｍ的石料与沥青粘附性提出了一种新的检验方法。     

Determinants of the property damage costs of tanker accidents

This study investigates determinants of the vessel, oil cargo spillage, and other-property damage costs of tanker accidents. Tobit estimation of a three-equation recursive model suggests that, among types of tanker accidents, fire/explosion accidents incur the largest vessel damage costs, but the smallest oil cargo spillage costs. Alternatively, grounding accidents incur the smallest vessel damage costs, but the largest oil cargo spillage costs, reflecting the difficulty of controlling oil cargo spillage subsequent to such accidents. Also, oil cargo spillage costs are lower for US flag tanker accidents. A dollar of vessel damage cost increases other-property damage cost by $0.06, whereas a dollar of oil cargo spillage increases this cost by $1.55.     

城市轨道交通首座车辆基地的设计特点

通过研究国内各地区城市轨道交通线网规划可以看出,每个城市的首座车辆基地普遍具有占地面积大、设计功能全的特点。结合兰州市轨道交通1号线首座车辆基地工程实际,在充分考虑车辆基地基本功能的前提下,提出首座车辆基地设计的艰巨性,通过分析总结车辆基地的总图布置、功能定位、设计规模、物业开发、工艺创新以及绿色设计等特点,研究结论为在各地区城市轨道交通首座车辆基地设计时,要在线网的角度充分考虑功能定位和配套设施设备,在确保运营功能的同时要重点考虑检修设施设备的资源共享、物业开发以及检修工艺的创新,要打造首座车辆基地为功能齐全、工艺先进、资源共享、土地价值高的现代生产基地,该研究结论能为类似工程提供参考。     

聚苯乙烯泡沫（EPS）变形特性的试验研究

由于聚苯乙烯泡沫(EPS)具有隔热性好、自重轻、自立性强、耐久性好、吸水性小及压缩性大等优良性能,使它在公路工程中得到广泛的应用。通过对四种重度(0.13 kN/m3、0.16 kN/m3、0.18 kN/m3、0.23 kN/m3)的EPS做三轴不固结不排水试验,得到结论:围压作用下,EPS的变形不可忽略。当EPS重度较大时,围压(特别是围压较大时)对轴向应变的影响小;当重度较小时,影响大。偏应力为负值试样也发生一定的轴向应变。     

农村客运属性及其要求分析

文章阐述了农村客运的概念及其线路类型划分,分析了农村客运属性及其要求,对如何正确理解和把握好农村客运属性及其要求提出了相关的建议。