Geoelectric section of the tectonosphere in the junction zone between the Sea of Japan depression and its continental framing

New data on the deep geoelectric structure of the tectonosphere in the junction zone between the Sea of Japan and continental structures are presented. The geolelectric section was modeled using unique data on the monitoring of the electric field variations in the JASC submarine trans-Japan communication cable and segments of land cables in the Primorye region. The monitoring was accompanied by recording of the geomagnetic field at the VLA, KHB, MMB observatories and PPI stationary site. In addition, magnetotelluric data from 80 field MTS sites in the territory of the Hankai Massif and Sikhote-Alin fold belt were used.     

海洋工程测量中海底电缆的磁探测法

建立了海底电缆的磁场模型，仿真计算了海底电缆产生的磁异常空间分布特性，讨论了海底电缆的磁探测和识别方法。仿真计算与实测磁异常曲线的一致性验证了海底电缆磁场模型的正确性。实验表明，采取合理的探测方法，可以对海底电缆进行探测和识别。     

地下管线综合探测技术在道路改造中的应用

以东莞市科技大道改造工程地下管线探测结果为例,论述了采用多种地球物理方法在复杂地区进行综合地下管线探测的技术,表明在道路改造的前期工作中,采用物探手段查明地下管线分布情况,对于保障施工安全非常重要。     

应用直流充电电位法查找地下电缆破损点

本文介绍了寻找地下共电电缆故障点的直流充电电位法及实例。结果表明，该方法效果明显，精度高。     

确定地下管线深度的方法原理研究

从理论上阐述了利用倾斜磁场最大值点、利用垂直磁场分量峰值点和利用水平磁场分量半极值点确定地下管线深度的原理方法,指出了利用倾斜磁场最大值点确定管线深度时在原理上存在的问题和不实用性,同时从原理上和实用中筛选出了最佳的定深方法-水平磁场分量三角法.     

Modeling of cable vibration effects of cable-stayed bridges

The analysis of dynamic responses of cable-stayed bridges subjected to wind and earthquake loads generally considers only the motions of the bridge deck and pylons. The influence of the stay cable vibration on the responses of the bridge is either ignored or considered by approximate procedures. The transverse vibration of the stay cables, which can be significant in some cases, are usually neglected in previous research. In the present study, a new three-node cable element has been developed to model the transverse motions of the cables. The interactions between the cable behavior and the other parts of the bridge superstructure are considered by the concept of dynamic stiffness. The nonlinear effect of the cable caused by its self-weight is included in the formulation. Numerical examples are presented to demonstrate the accuracy and efficiency of the proposed model. The impact of cable vibration behavior on the dynamic characteristics of cable-stayed bridges is discussed. Supported by: Natural Science and Engineering Research Council of Canada     

军山斜拉桥非线性时域抖振分析

武汉军山大桥是跨越长江的中跨跨径很大的斜拉桥，在脉动风作用下，其线性抖振响应较大，动力放大系数基本上大于2。为了比较该桥非线性抖振响应与线性抖振响应的差别，本文根据某地短期的实际风速时程记录资料，在一定的概率下，对该地区100年一遇的极值风速时程进行抖振分析比较。计算结果表明，对于该桥说来非线性影响不是很明显。     

气动或液动冲击回转双管正循环钻进工艺及MD-100型锚固工程钻机

针对岩土锚固成孔的难题，提出适合复杂地层链固钻进的新工艺-“双管钻进”工艺，并结合新工艺应用，研制了新型锚固工程钻机，详细介绍了“双管钻进“方法和钻机情况。     

SPOT卫星影象严密数字几何校正的直接法

由于SPOT卫星影象的行中心投影成象方式和外方位元素时序变化特点,在实施严密数字几何校正的过程中,直接法的应用显示了很大的优越性。为此,本文提出了应用直接法的原理和方法,指出了技术关键和确保锚点坐标解算精度和可靠性的方法。由于直接法可较精确地确定锚点所在行的外方位元素,不需要迭代计算,因而不仅计算速度快,而且从实验结果包括锚点坐标计算精度,锚点网格内插精度估计和几何校正结果之正射影象精度的分析都表明直接法优于间接法,证实了所提出的原理方法的合理性和正确性。