苏拉马部大桥钻孔桩泥浆牲能研究

在水敏性岩土体中进行钻孔灌注桩施工时,泥浆的失水量指标是钻孔能否成功的重要因素。通过对泥浆性能及适用范围的对比,阐明高分子聚合物泥浆不适合循环钻作业,介绍了苏拉马都大桥钻孔桩施工时选用CMC膨润土泥浆的原因,并对使用海水配制膨润土泥浆可行性进行了分析。     

采用水泥土搅拌法处理连云港地区软基的适应性问题

通过时具体工程项目大量的室内和现场试验结果的分析,从土性影响因素、成桩工艺、水泥品种选择和外掺剂等因素时采用水泥土搅拌法处理连云港地区软基的适应性问题进行了深入的讨论,讨论了水泥土搅拌法在连云港地区的适用条件．提出了采用水泥土搅拌法处置连云港地区软基的配比方案和施工工艺要求。     

我国海商法有关海运提单强制适用问题的研究

确认海运提单法律适用是一项比较复杂的问题,涉及到多层面的法律适用问题。不同的层面有时交融在一起,又为确认海运提单法律适用带来一定的难度和困惑。究竟以何种法律解决不同层面的问题,不但给当事人带来困惑,而且为法官审案造成极大不方便。我国海商法立法上没有明文规定我国海商法强制适用范围,理论和司法实务中引发了我国海商法是否对进出我国港口货物签发的海运提单具有强制适用以及根据提单法律适用条款引用的外国法违反了我国海商法第四十四条的强制性规定,是否给予确认的争论。为根本解决提单法律适用问题,本文提出我国海商法应规定其强制适用范围。     

Determination of the transportable moisture limit of iron ore fines for the prevention of liquefaction in bulk carriers

In 2013, over 500 million metric tons of Iron Ore Fines (IOF) were transported around the world using bulk carriers. Under certain conditions IOF, while being transported, can possibly undergo liquefaction. Since 2006, there has been eight reported bulk carrier casualties possibly caused by the liquefaction of IOF. The objective of this study is to evaluate, compare and verify the limitations and relevance of the Proctor/Fagerberg, Flow Table and Penetration test methods that are used to determine the Transportable Moisture Limit (TML) of IOF. The TML is the maximum gross water content that bulk cargoes, including IOF, may contain while being transported at sea without being at risk of liquefying. A thorough literature review, along with laboratory research, was carried out to compare the TML results from the three leading test methods to determine whether they produce reliable results when testing IOF. The study concludes that the three test methods, as stated in the 2012 International Maritime Solid Bulk Cargoes Code, are unverified and therefore not appropriate for testing IOF. This is due to the variation in the results produced by the three test methods and also due to the difference in the physical properties of IOF when compared with the materials that were originally intended for testing. It is noted that the TML alone may not control the potential liquefaction of IOF and further studies, regarding the physical properties and system variables, which cause the material to liquefy, are required to determine the liquefaction potential of IOF.     

基于扩张状态观测器的列车轨迹跟踪控制及其在CMC环境的测试

在列车运行过程中,存在着复杂且不确定的外部环境,很难获得阻力的表达式和阻力系数,因此,准确的外部阻力估计直接影响到列车轨迹跟踪精度。设计一种新型的基于扩张状态观测器的列车轨迹跟踪控制算法,将外部阻力和内部干扰扩展为一个新的状态变量,并进行精确估计。采用遗传算法对扩张状态观测器的参数进行优化。最后,在国产CMC芯片的硬件环境下进行测试。测试结果表明,基于扩张状态观测器的控制策略比现有广泛使用的PID算法具有更好的跟踪性能。得出以下结论:所设计控制算法通过补偿各种干扰的影响达到列车位置和速度的精确追踪,具有较强的抗干扰性。     

CMC改性海水泥浆性质变化及砂地层成膜试验研究北大核心CSCD

为探究泥水盾构穿越海底砂地层时羧甲基纤维素钠(CMC)对海水泥浆性质及成膜效果的影响,配制不同CMC掺量的海水泥浆,分析泥浆泌水率、黏度、Zeta电位等性质的变化情况,并开展了泥浆渗透成膜试验。研究结果表明:相对于海水泥浆,加入CMC后的泥浆黏度逐渐增大,2h泌水率显著减小,形成的泥膜中结合水含量逐渐变大,泥膜渗透系数减小至4.03×10^(-8)cm/s;改性海水泥浆中粒径小于75μm的细颗粒含量显著增加,静置24h后,泥浆上部呈现浑浊,下部依然存在较严重的沉淀;当CMC掺量达到0.16%时,改性海水泥浆2h泌水率小于10%,成膜渗透流量小于0.01m^(3)/m^(2),可以保证泥浆短期稳定性并形成致密泥膜。     

海事国际惯例在我国调整涉外海事关系中适用顺序的探讨——兼论对我国《海商法》第268条的修订

针对我国《海商法》第268条规定的不明确性,通过分析我国相关法律法规的规定,论述了调整涉外海事关系中海事国际惯例适用顺序问题,指出在调整涉外海事关系中应依次适用我国缔结或者参加的国际条约、法律、行政法规、国际惯例、地方性法规、规章。在此基础之上,对我国《海商法》相关条款的修改与完善提出了建议。