Study on shallow structural features Changbaishan Tianchi volcanic region     

潘纪顺顾梦林  赵成斌潘素珍 《地震学报(英文版)》2006,19(4):428-437

A seismic survey by 10 shallow profiles and 6 ultra-shallow profiles was performed in Changbaishan Tianchi volcanic region in 2002. The result shows that there are three （in some areas as many as seven） stable interfaces in the survey region, but no reflection phases are found in depths greater than 500 m. The number of interfaces in the southwestern part is obviously greater than in the northwestern part of Tianchi volcano, which suggests that the faults in the southwest have a stronger controlling power over the flow direction of volcano-spewed lava as compared with those in the northwest. Six shallow faults exist in the survey region. The shallow faults are nearly vertical graben-like faults and are mostly distributed on the southwest of Tianchi crater, indicating that volcanic activities in the southwest are stronger than in the northwest. On this ground, it could be further deduced that the NE-trending major fault of Tianchi volcano （ the Liudaogou-Tianchi-Zengfengshan fault） is more active than the NW-trending Baishanzhen-Tianchi-Jince fault.  相似文献   

工程地质三维空间建模技术及其应用研究   总被引：10，自引：1，他引：10  

李建华  边馥苓 《武汉大学学报(信息科学版)》2003,28(1):25-30

对工程地质研究的主要三维空间对象(勘探区域三维地质剖面体)进行了规范化的构造描述，对当前主流三维空间建模方法进行了综合分析。在此基础上，结合专业建模对象的构造特点及三维数据模型适用表达对象的不同特性，融合单元分解表示(CE)、构造实体几何(CSG)和边界表示(B-Reps)三种数据模型的建模思想，以及栅格模型的基本体元划分机制和数据组织方式，以不规则五面体为基本分析单元，采用面向对象方法构造模型内各娄对象，提出了一种面向对象的三维矢量与栅格混合模型，实现了勘探区域三维地质剖面体的惟一性拓扑表达，并给出了可视化方案。分析了几例基于此模型的工程地质应用，借以验证该模型在工程地质领域内应用的合理性和可操作性。  相似文献   

基于多层DEM表面模型的地层结构的三维可视化   总被引：8，自引：0，他引：8  

张珊珊  刘志辉 《测绘信息与工程》2003,28(3):14-15

通过建立多层DEM表面模型构造三维地层结构，讨论了利用不规则三角网模型以绘制多层三维地层模型和三维剖面的技术和方法，并在微机上进行了实现。  相似文献   

高压旋喷在闽东大广场软弱地基处理中的应用     

翁时瑞 《福建地质》2003,22(3):158-160

介绍闽东大广场A^#楼片筏基础持力层下卧软弱土层采用高压旋喷处理的施工工艺及效果。  相似文献   

岩层破坏突变前兆异常识别方法   总被引：1，自引：0，他引：1  

谭云亮  赵同彬  颜伟 《岩土力学》2003,(Z2)

岩层是一种力学性质极为复杂的材料,其破坏灾变前兆异常呈现出多变性。作者就岩层破坏灾变前兆异常的几种识别方法包括趋势与滤波、模糊识别、分形方法和奇点的多分辨率小波识别等进行了对比分析。实例表明,小波技术可有效对岩层突变异常信息点进行多尺度辨析,能够对顶板冒落灾变前兆信息进行有效把握,是值得推广的一种方法。  相似文献   

福建沿海地区场地土对地脉动动力响应的研究     

许建聪  简文彬  尚岳全 《岩土力学》2003,(Z2)

以福建省泉州市区和福州市区场地土的动力特性和地脉动频谱结构为研究对象,通过对这两个地区的地脉动信号的频谱分析获得频谱结构特征,由此来深入研究该地区岩土的动力特性及场地土层的地脉动动力响应。通过场地脉动的测试,利用快速傅立叶变换(FFT)方法对观测到的地脉动信号进行频谱分析。根据实际观测资料研究了地脉动频谱结构特征及场地土对地脉动的频率响应的特性。研究不同地基土层构造与地脉动的频率依赖以及频率选择作用。结果表明,地脉动的频谱特性与场地覆盖层厚度和地基土刚度的变化密切相关;覆盖层厚度是影响地脉动卓越周期的重要原因,其中软土层对地脉动的卓越周期有一定的放大作用。  相似文献   

Eclogites preserved as pebbles in Jurassic conglomerate, Dabie Mountains, China   总被引：9，自引：0，他引：9  

Qingchen Wang  Renwei Li  Daoxuan Wang  Shuangying Li 《Lithos》2003,70(3-4):345-357

Two types of eclogite pebbles were discovered in Middle to Upper Jurassic conglomerates from the Hefei Basin north of the Dabie ultrahigh-pressure (UHP) terrain, China. Type A eclogite pebbles are characterized by idioblastic garnet with well preserved chemical zonation. Si content in phengite is lower than 3.5 per formula unit (pfu). The maximum metamorphic pressure is lower than 2.5 GPa, and the temperature is below 600 °C. Type B eclogite pebbles contain coesite pseudomorphs in xenoblastic garnet. Si content in phengite is higher than 3.5 pfu. The maximum metamorphic pressure is 2.8–4.0 GPa at 700 °C indicating UHP metamorphism.

Types A and B eclogite pebbles are comparable with eclogites occurring in the southern portion of the Dabie UHP terrain. Based on the petrologic similarities and northeastwards directed paleocurrents, we infer that the eclogite pebbles were eroded from the Dabie UHP terrain. Sandstones containing detrital phengite with Si content higher than 3.5 pfu are also derived from UHP rocks. These petrologic and stratigraphic data place time constraints on exhumation and erosion history of the Dabie UHP terrain.  相似文献   

人工地震动增油技术的应用   总被引：2，自引：2，他引：0  

于海力 《地震工程与工程振动》1998,18(1):120-123

本文对人工地震动增油技术在全国各油田应用所取得的经济效益进行了对比,对本项技术的应用提出了建议。  相似文献   

临夏塬堡黄土剖面中晚马兰黄土地层划分和形成时代   总被引：4，自引：5，他引：4  

陈一萌  饶治国  张家武  陈兴盛  周爱峰 《中国沙漠》2004,24(5):539-543

通过对位于黄土高原西部区临夏塬堡中晚马兰黄土剖面地层岩性、代用指标及地层年代学的分析研究．认为该研究剖面存在1个强成壤层和6个弱成壤层．记录了1个间冰期6个间冰段和7个冰段事件。其中马兰黄土中部3层古土壤是末次冰期间冰段的记录，尤以下层古土壤发育最好，上层次之，中部古土壤的发育介于二者之间，表明即便是气候较温湿的间冰段．其气候的温湿程度也是有差异的。色度指标中的亮度不仅可参与地层划分．与CaCOx、频率磁化率有很好的相关关系，而且是一个可靠的、更为敏感的气候环境变化代用指标。  相似文献   

The movement age of hidden fault and analysis on width of its effect zone from shallow seismic sounding and drilling data     

杨晓平  李德庆  赵成斌  刘保金  孙振国  赵景尧 《地震学报(英文版)》2004,17(Z1)

Introduction Artificial seismic sounding is a geophysical exploration technique developed in prospectingfor oil and gas and other mineral resources and consists of reflection wave and refraction waveexploration methods. With rapid development of computer techniques and sounding instruments,the reflection wave method became a high-resolution imagery technique for underground struc-tures and is widespreadly used in detection of underground caves and in engineering exploration.In previous se…  相似文献