Anti-seismic research on nuclear engineering siting

Nuclear engineering belongs to significant project; there is higher requirement on sitings. The study has discussed basic factors of selecting sites, anti-seismic research on sitings including the seismic ground motion, probability methods of seismic hazard analysis as well as interaction about structure and foundation, meanwhile provide the reason for nuclear engineering selecting sites.     

青皇岛市青龙县城工程场地地震危险性分析

本文以秦皇岛市青龙县城工程场地为例，采用Ａ·Ｄｅｒ·Ｋｉｕｒｅｇｈｉａｎ和Ａ·Ｈ－ＳＡｎｇ断层－破裂模型，通过潜在震源识别及震源区划分、地震动参数确定、地震动衰减公式计算模型建立及不确定性校正、场地地震危险性评定等思路和方法，对该场地进行了地震危险性分析和评定。结果认为，该场地建筑物按５０年使用期，地震烈度为６．７２度，其地面峰值加速度为０．１０３ｇ；一般建筑物按Ⅵ度烈度设防，重要建筑则按Ⅶ度烈度设防；可能产生的Ⅷ度烈度主要来自西南方向的唐山地震区。     

地脉动频谱特性在探究场地评价中的应用

运用单点谱比法对地脉动频谱特性进行分析,根据频谱类型分类结果给出场地卓越周期建议值。在已有钻孔资料基础上,建立卓越周期与覆盖层厚度间的相关关系,并通过实际的工程数据验证了二者关系式的准确性和普适性。由于地脉动观测具有经济、简单、快捷的优点,可将其运用到不宜进行钻孔勘探的复杂场地,从而为该地区工程场地地震安全评价和地震小区划、场地类别划分、场地选择和评价提供基础资料。     

工程场地地震动参数的确定

以咸阳某工程场地为例，首先阐述了场地的地震地质条件，然后在场地地震危险性概率分析的基础上，对场地土层进行一维地震反应分析计算，确定了该工程场地地震动参数，为抗震设计提供了依据。     

长治市区浅部地层及剪切波速度结构特征

利用长治市区工程场地地震安全性评价项目中已完成的43个钻孔及剪切波速测井资料,基于克里金插值方法,构建长治市区浅部地层及剪切波速度结构模型。结果表明,长治市区浅部地层及剪切波速具有较强的横向非均匀性结构特征,其沉积建造明显受水文地质环境及主要断裂的控制。     

TSP隧道地震预报空洞模型的数值模拟研究

采用有限元方法模拟隧道地震波场,采用波场快照与时间记录相结合的方法,研究空洞对隧道地震波场传播的影响,并对含空洞模型的时间记录进行处理,得到数值模型的速度云图和反射层位图。经数据处理表明,采用TSPwin设定默认值处理得到的速度云图与模型设定的空洞位置比较一致,在提取反射层位图上,空洞反射层呈现条带状特征,需要结合速度云图来确定空洞位置,且P波预报的准确性相对较高。对TSP系统的抗噪性进行研究,表明其具有良好的抗噪性能。最后通过对工程实例的处理,验证了数值模拟所得的结论。     

浅层综合地震勘探方法在隧道工程勘探中的应用

本文论述了浅层地震勘探方法(特别是透射CT技术)在陕北黄土梁峁地区隧道勘探中的综合应用问题,认为在实际勘测中应结合具体的地表地震地质条件因地致宜地选择浅层地震勘探方法技术,以达到使工程勘探结果最佳化的目的。     

3DS在公路选线中的应用

基于3DS的公路选线分析系统．将GIS、遥感等技术引入公路建设工程的可行性分析中．充分发挥其数据可视化、空间分析等功能，从三维的角度和环境因素综合分析后做出公路选线的方案，有效地解决传统方法中的不足．加强分析过程的科学性，提高分析结果的准确性，缩短工作周期，大大提高工作效率。     

地震勘探全波形反演的应用与发展分析

本文首先对20世纪80年代发展起来的全波形反演应用及其在勘探地球物理领域的发展进行了分析;其次,面对定量化、精细化的地震勘探要求,提出了将地震勘探全波形反演与其他数据处理环节或处理技术相结合的研究设想,并展望了全波形反演的发展趋势;最后,论述了全波形反演研究中地震波场数值模拟、反演初始速度模型获取、目标函数形式选择、寻优算法启用及各向异性介质中的应用等关键问题,并总结了通过Laplace域的全波形反演获取反演初始速度模型、结合射线追踪并充分发挥并行计算之于波动方程方法来模拟地震波场的巨大优势,及灵活选用反演目标函数形式和寻优算法更新速度模型参数来加快全波形反演方法的实用化进程。     

Effects of site conditions on earthquake ground motion and their applications in seismic design in loess region

The Loess Plateau is an earthquake prone region of China, where the effects of loess deposit on ground motion were discovered during the 2008 Wenchuan earthquake (Ms8.0) and the 2013 Minxian-Zhangxian earthquake (Ms6.6). The field investigations, observations, and analyses indicated that large number of casualties and tremendous economic losses were caused not only by collapse and damage of houses with poor seismic performance, landslides, but also amplification effects of site conditions, topography and thickness of loess deposit, on ground motion. In this paper, we chose Dazhai Village and Majiagou Village as the typical loess site affected by the two earthquakes for intensity evaluation, borehole exploration, temporary strong motion array, micro tremor survey, and numerical analysis. The aim is to explore the relations between amplification factors and site conditions in terms of topography and thickness of loess deposit. We also developed site amplification factors of ground motion for engineering design consideration at loess sites. The results showed that the amplification effects are more predominant with increase in thickness of loess deposit and slope height. The amplification may increase seismic intensity by 1 degree, PGA and predominant period by 2 times, respectively.     

PS测井在机场隧道地基勘查中的应用

PS测井技术是地震勘探方法之一,也是一种简便、快速、准确的原位测试技术。该文介绍了单孔法PS测井的原理及其在铁路工程勘察中的应用,主要包括根据等效剪切波,进行建筑抗震场地类别划分,铁路工程抗震场地类别划分。根据岩土动力学参数,达到评价岩体质量和划分围岩类别目的,利用剪切波速法估算岩土的承载力基本值。通过青岛机场隧道场地的工程实例说明了PS测井技术在岩土工程勘察设计中的应用情况及应用效果。     

小波阈值法在JCZ系列超宽频带地震仪记录的地震数据中的应用及探讨

为了对JCZ系列超宽频带地震仪采集到的地震数据进行有效去噪,探讨小波阈值法在不同地震数据中去噪的实际效果.首先介绍小波法的基本理论与去噪标准,探讨不同小波基的选取、不同分解、重建尺度与阈值的选取及处理方式对小波阈值法最终去噪效果产生的影响;使用控制变量法,选取武汉水院地震台的记录数据,探讨如何获得较好的去噪效果.为了比...     

��ά����Ԫ����ˮƽ�����ģ�ⷽ��������

?????????????????????????ο??????????????????????????????????????????????????????????NGA?????????????????????????飬??????????????????????о?????????????????????????????????????????2012?????4.7??????????е?????????????????????????????????????PGA??????S??a??T???????б????о??????????????????????????????????????????????????????????????????????????????????????????????     

Shallow water body data processing based on the seismic oceanography

Physical properties of sea water,such as salinity,temperature,density and acoustic velocity,could be demarcated through degradation of energy caused by water absorption,attenuation and other factors.To overcome the challenging difficulties in the quick monitoring of these physical properties,we have explored the high resolution marine seismic survey to instantly characterize them.Based on the unique wavefield propagating in the sea water,we have developed a new approach to suppress the noise caused by the shallow sea water disturbance and obtain useful information for estimating the sea water structure.This approach improves seismic data with high signal-to-noise ratio and resolution.The seismic reflection imaging can map the sea water structure acoustically.Combined with the knowledge of local water body structure profile over years,the instant model for predicting the sea water properties could be built using the seismic data acquired from the specially designed high precision marine seismic acquisition.This model can also be updated with instant observation and the complete data processing system.The present study has the potential value to many applications,such as 3D sea water monitoring,engineering evaluation,geological disaster assessment and environmental assessment.     

Fuzzy-support vector machine geotechnical risk analysis method based on Bayesian network

Machine learning method has been widely used in various geotechnical engineering risk analysis in recent years. However, the overfitting problem often occurs due to the small number of samples obtained in history. This paper proposes the FuzzySVM(support vector machine) geotechnical engineering risk analysis method based on the Bayesian network. The proposed method utilizes the fuzzy set theory to build a Bayesian network to reflect prior knowledge, and utilizes the SVM to build a Bayesian network to reflect historical samples. Then a Bayesian network for evaluation is built in Bayesian estimation method by combining prior knowledge with historical samples. Taking seismic damage evaluation of slopes as an example, the steps of the method are stated in detail. The proposed method is used to evaluate the seismic damage of 96 slopes along roads in the area affected by the Wenchuan earthquake. The evaluation results show that the method can solve the overfitting problem, which often occurs if the machine learning methods are used to evaluate risk of geotechnical engineering, and the performance of the method is much better than that of the previous machine learning methods. Moreover,the proposed method can also effectively evaluate various geotechnical engineering risks in the absence of some influencing factors.     

地震动输入方向对结构扭转振动的影响

选取2009年姚安MS6.0、2014年鲁甸MS6.5地震的水平结构强震记录进行谱分析,结果均显示17 Hz、2.1 Hz为该结构第一、二振型的自振频率,且第二振型出现扭转现象。对比两次强震记录发现,鲁甸MS6.5地震作用下结构的扭转振动远超姚安MS6.0地震。利用SAP2000建立该结构的有限元模型,分别以实际入射角度输入场地强震记录并进行时程分析,其结果与强震记录谱分析结论一致。由于输入地震动的强度、频谱相近,因此判断其输入方向是影响结构平面扭转振动的主要原因。     

发震时间的指数分布、Gamma分布和Weibull分布之间关系的研究

从理论上讨论了地震发生时间研究中常见的指数分布、Gamma分布和 Weibull分布模型之间的相互关系及其所反映的地震序列的特征。同时 ,对工程地震和地震预报中常见的危险函数所反映的地震特征作了分析。指出了指数分布、Gamma分布所反映的地震序列的内涵及统计时应注意的问题。利用华北地区历史地震资料 (M>4 .7)进行了分时段齐次统计的示范实例化分析 ,结果表明 :对地震序列分时段齐次化统计能表述地震发生的不均匀现象 ,且处理简便。     

威海市城市垃圾填埋场选址地质环境适宜性评价

威海是"最适宜人类居住的地方",但随着城市建设的快速发展,城市垃圾产生量不断增加,垃圾填埋场选址问题亟待解决。以威海市环翠区为研究对象,综合考虑地形地貌、土地利用规划、交通、水利规划、气象、地质、水文地质、工程地质、环境地质等多方面因素及经济效益和环境效益,从地质环境角度出发,选取5个层次共15个评价因子,采用层次—网格法进行了垃圾填埋场选址区划分析研究,划分出垃圾可填埋区、限制填埋区、禁止填埋区。并在限制填埋区和可填埋区,进一步优选出几个垃圾填埋场地的首选场址,可供规划、设计部门参考。     

利用IP传输技术改造武汉数字遥测地震台网系统

介绍如何利用IP通讯协议,通过Internet网络,实现改造地震台站观测设备与武汉数字遥测地震台网系统的信息集成。改造后的武汉数字遥测地震台网系统,提高了数字化资料高效性,满足了科学传递运行模式的需求,降低了台网传输故障率,减少了后期维护的人力和物力的投入。     

武汉主城区液化潜能分区研究

搜集并整理武汉主城区地震安全性评价控制性钻孔SPT-N资料,配合武汉市地震动参数小区划成果,采用规范法对各场地土层在罕遇地震作用下液化可能性进行判别。以液化指数作为分区指标并结合各场地坐标,绘制武汉主城区液化潜能分区图。分区图初步预测了罕遇地震发生以后,可能发生液化的区域及其严重性,且表明无论是分布面积还是液化潜能,长江右岸均大于长江左岸。通过与4次历史大震液化资料的对比分析,武汉主城区可能液化场地具有地下水位埋深浅、液化土层分布范围广、埋藏深度大的特点。