【摘 要】
：
The analytical solution for the responses of saturated soil layer under dynamic load is difficult to obtain though it is very important in many cases,such as piles,plates or dams in prevention enginee
论文部分内容阅读
The analytical solution for the responses of saturated soil layer under dynamic load is difficult to obtain though it is very important in many cases,such as piles,plates or dams in prevention engineering of landslide and debris flow under dynamic loads caused by impact of fluid flow or stones.Two methods,direct solving method and multiple scale expansion,were presented for solving for this type of problem.First,flow function and potential function were introduced to decouple the controlling equations.Then direction solving method was used to obtain the solution.This method can be used in general conditions but the solving process is complex.Considering that in some cases related with more than one time scale such as seepage and inertial,a relative simpler method,the multiple scale expansion based on perturbation method,was introduced to solve the equation system as the second method.The response characteristics were discussed and compared with the experimental results.
其他文献
为支撑深海远海搜寻救助系统总体规划编制，从履行职责公约、服务国家战略、应对突发事件、实现转型升级等方面，阐述了深海远海搜救系统布局研究进程与成果；从通信监控系统、搜救飞机及基地、搜救船舶及基地、扫测打捞装备等方面，评估我国深海远海搜救系统存在的问题和差距；从全方位覆盖、快速度反应、高效率处置等三个层面，制定并论证深海远海搜寻救助系统目标体系和配置思路。
Seaport sector plays a pivotal role in promoting international trade and economic development.The Chinas Belt and Road Initiative(BRI)has triggered investment in seaport development in countries along
为强化港口水域引航员在船时的船舶操纵风险控制，对引航工作现状、岸基支持系统和被引船舶驾驶台支持系统的组成、引航团队管理的组织结构及其主要支持系统进行分析，对引航员单兵作战时驾引双方的相互监督和支持提出方向。
高速公路隧道单调昏暗的光环境，会导致隧道中部时空隧道效应和隧道出入口 “黑洞”、“白洞”效应；使驾驶员产生视错觉，从而导致超速、车距不足，诱发追尾、撞侧墙等事故。本文在总结现有高速公路隧道光环境改善方法基础上，提出基于视觉参照系重构的高速公路隧道光环境改善新思路，通过加强隧道内弱视觉参照系，缓和隧道出入口剧烈过渡的视觉参照系，来合理控制驾驶员视错觉，从而缓解超速行为及车距不足，进而减少高速公路隧道
为研究山区局部地形对桥址区风场空间特性变化的影响,以位于我国西南山区的某大桥为工程背景,利用FLUENT 对山区地形风场特性进行数值模拟,通过36 个风向工况的计算分析,得到复杂山区地形桥址区风场的空间分布特性.受复杂地形影响,各桥位平均风速风剖面曲线和沿主梁横桥向风速曲线差异较大,桥址区附近地形最高点以上400m 风场仍明显受地形影响；受河道大角度弯曲影响,桥址区形成类似“单向开口槽”的地形,各
With the development of tunnels and underground engineering,the problem of karst disasters is worsening.The water inrush is one of the most serious geological disasters during the construction of kars
The IB-SEM system was established based on the Spectral element method and the rigid immerse boundary method.This system was used to simulate the int eraction of the solid and fluid.Then the theory an
本文重点介绍了基于Matlab 的桥梁裂缝自动识别技术，研究表明：采用Matlab 和灰度理论的方法，可以测得裂缝宽度，提高了桥梁检测的效率和效果，具有重要的应用推广意义。
Construction control of micro-disturbances in old shanty towns under a large-diameter shield is a difficult problem in the practice of underground geotechnical engineering.The Wuhan,China Metro Line 8
视觉适应包含了明适应和暗适应两个方面，以前的研究对于适应时间长短的描述不尽相同，甚至差异很大。本研究在实验室模拟了公路隧道照明状况，通过对多个实验样本依据视觉功效法对亮度从暗状态(100 cd/m2)到明亮状态(4000cd/m2)再到暗状态(100cd/m2)下的瞳孔变化和反应时间数据进行了测量，根据对瞳孔变化和反应时间数据的分析，得出了有效(初步)明、暗适应时间的长短(分别为5-8s 和15-