深基坑边坡超载计算方法探讨及其工程应用

本文提出了深基坑边坡超载计算方法的建议,并将该方法应用于工程实例,获得了较好的经济效益     

邢台地震前地壳形变异常的可能性物理机制

将地壳介质视为麦克斯威尔体 ,运用差分法和三维有限元方法 ,探讨了邢台分层地壳结构模型 （含高速体和低速体及深大断裂 ）中深部断裂加速蠕滑时 ,平均应力、水平最大剪应力和地表面垂直位移随时间演化的特征 ,计算结果表明 :（1 ）在地壳中上部 1 1km处 ,深部断裂的加速蠕滑急剧加速了水平最大剪应力的增加速率 ,可达数百倍 ,深部断裂的加速蠕滑是邢台强地震成核过程的开始 ,可实现地壳下部的能量向地壳中上部快速转移 ;（2 ）深部断裂的加速蠕滑引起的地面垂直位移变化与邢台地震震前的地表面垂直位移变化非常一致 .说明邢台地震震前地壳表面垂直方向的位移不仅与岩石的膨胀有关 ,而且可能与地壳内深部断裂的加速蠕滑密切相关 .     

高速公路拼接段地基处理设计分析方法与工程实践

针对新、老高速公路拼接段的两种拼接型式直接拼接和分离拼接 ,对新建路基实施拼接后 ,以超载形式引起已建高速公路产生的附加沉降的不良影响进行研究 ,选择了造价低、施工方便的沉降隔离墙方案。应用土体固结非线性有限元法 ,对锡澄与沪宁高速公路拼接段中的隔离墙在工程中所起的作用进行数值模拟 ,计算分析表明 ,隔离墙的存在可有效地减少锡澄高速公路拼接后对沪宁高速公路主线中心的附加沉降量。     

坐标换带投影参数录入错误的数据纠正方法

针对如何对错误的投影数据进行纠正,介绍了通过数据的有效检核,探测误投影数据所采用的投影参数,然后进行数据的有效纠正。并以某县的行政区数据进行验证,结果证明该数据纠正方法是有效的,且此方法能实现零误差的数据转换。     

Numerical integration for the real time production of fundamental ephemerides over a wide time span

A simplified model of the solar system has been developed along with an integration method, enabling to compute planetary and lunar ephemerides to an accuracy better than 1 and 2 milliarcsecs, respectively. On current personal computers, the integration procedure (SOLEX) is fast enough that by using a relatively small ( 20 Kbytes/Cy) database of starting conditions, any epoch in the time interval (up to ±100 Cy) covered by the database can be reached by the integrator in a few seconds. This makes the algorithm convenient for the direct computation of high precision ephemerides over a time span of several millennia.     

Probabilistic seismic hazard maps for Panama

Probabilistic seismic hazard maps in term of Modified Mercalli (MM) intensity are derived by applying the Cornell-McGuire method to four earthquake source zones in Panama and adjacent areas. The maps contain estimates of the maximum MM intensity for return periods of 5, 25 and 100 yr. The earthquake phenomenon is based on the point source model. The probabilistic iso-intensity map for a return period of 50 yr indicates that the Panama Suture Zone (PSZ) could experience a maximum (MM) intensity IX, and the Panama Fracture Zone (PFZ) an MM intensity VIII, for the rest of the area this varies from IV up to VIII. The present study intends to serve as a reference for more advanced approaches, to stimulate discussions and suggestions on the data base, assumptions and inputs, and path for the risk based assessment of the seismic hazard in the site selection and in the design of common buildings and engineering.     

黄、东海环流的数值研究Ⅱ潮及潮致环流数值模拟

该文中数值模拟了黄、东海陆架区的四大天文潮及其潮致拉格朗日环流。运用“流速分解法”将线性三维分潮波问题化为一个分潮潮位及深度平均流的二维问题和一个流速垂向剖面问题求解。其二维问题的底摩擦系数由三维模式导出 ,所导得的线性底摩擦力公式更符合物理意义 ,且避免一般二维模式中底摩擦力的经验假定。结果表明 ,三维模式完全可以通过准二维方法求解 ,以避免一般三维问题的繁重计算     

Simplified Computation Method of Vibration Characteristics of Jacket Platforms

In this paper a simplified computation method of natural frequency of jacket platforms is given. Shear, bending and rotary inertia effects are considered in the equation, while the jacket shape, rotary inertia and centralized mass of the platform top are all determined by using a coefficient-revising method.