正常固结饱和粘性土的不排水强度     

侯龙清  黄松华  罗嗣海 《上海国土资源》2001,(Z1):59-61

本文以有效应力强度理论和Henkel孔隙水压力公式为基础,建立了各种类三轴与平面应变试验条件下正常固结饱和粘土的不排水强度公式及相互关系;初步估计了粘土强度随固结增长的计算公式.  相似文献   

天津地区小震应力状况     

薛志照  杨港生 《地震地磁观测与研究》1992,13(1):34-39

本文测定了天津地区1985—1990.9年间M_L=3.0以下小震的震源参数,共125次。结果表明:地震应力降△σ一般都不高,多数低于1.3Mpa;区域剪切应力和地震应力降均有明显的增高趋势。1989年末开始下降。由P波测定的介质Q值蓟县平均为350,宝坻、宁河、静海为250,天津西稍高。小震平均震源机制主压应力轴由北西9°,向西偏转26°。这些变化,不仅反应本地区应力调整过程,而且是华北区域应力变化过程的局部显示。  相似文献   

多普勒天气雷达速度回波图的UHF信道传输     

赵恒轩  黄兴友 《南京气象学院学报》1992,15(2):134-140

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Influence of viscoelastic coupling on the axial rotation of the Earth and its fluid core     

M. Lefftz  H. Legros 《Geophysical Journal International》1992,108(3):725-739

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Geotechnical properties of a chemically stabilized soil from Malaysia with rice husk ash as an additive   总被引：1，自引：0，他引：1  

F. Haji Ali  A. Adnan  Chew Kam Choy 《Geotechnical and Geological Engineering》1992,10(2):117-134

Summary The stabilization of Malaysian soil by mixing with rice husk ash, a locally available waste material, to improve its engineering properties is described. Stabilizing agents, i.e. cement and lime, were added to produce the reaction products which are responsible for the enhancement of the engineering properties. Based on the strength development, it seems that lime is the more effective stabilizing agent. However, the cheap waste material can be used as partial replacement for the more expensive cement in the cement-treatment of the soil. A durability study was carried out to evaluate the effectiveness of this stabilization method.  相似文献   

强地震动数据采集实时系统研究   总被引：4，自引：1，他引：3  

高峰  陈先  魏继武 《地震工程与工程振动》2003,23(5):8-16

本文介绍了GDQJ-2型强地震动数据采集实时系统的结构原理和技术性能,着重介绍了一个台网形式的数据采集实时系统数据的处理流程、系统软件的多线程处理、对串口和Modem的操纵方式、数据帧的构成和压缩方式等。该系统可用于强地震观测和工程振动测量。  相似文献   

Efficient seismic response data storage and transmission using ARX model‐based sensor data compression algorithm     

Yunfeng Zhang  Jian Li 《地震工程与结构动力学》2006,35(6):781-788

This paper presents a linear predictor (LP)‐based lossless sensor data compression algorithm for efficient transmission, storage and retrieval of seismic data. Auto‐Regressive with eXogenous input (ARX) model is selected as the model structure of LP. Since earthquake ground motion is typically measured at the base of monitored structures, the ARX model parameters are calculated in a system identification framework using sensor network data and measured input signals. In this way, sensor data compression takes advantage of structural system information to maximize the sensor data compression performance. Numerical simulation results show that several factors including LP order, measurement noise, input and limited sensor number affect the performance of the proposed lossless sensor data compression algorithm concerned. Generally, the lossless data compression algorithm is capable of reducing the size of raw sensor data while causing no information loss in the sensor data. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   

云南兰坪—思茅盆地中轴构造带的特征及其研究意义   总被引：9，自引：1，他引：9       下载免费PDF全文

管 烨王安建  李朋武曹殿华 刘俊来 《中国地质》2006,33(4):832-841

笔者利用云南西部已有的DSS地震测深、石油反射地震资料的再解释,并通过地球物理、地球化学以及矿产等资料的综合分析,对滇西兰坪—思茅盆地内的中轴构造带的构造特征进行了深入分析。研究结果表明兰坪—思茅盆地内的中轴构造带是一条近南北走向的集断裂带、伸展构造、深部隆起为一身的大型构造带。地震测深的速度结构及反射地震剖面表明,中轴构造带在思茅盆地南部存在有深部地幔的上隆现象,该构造带内的断裂系统倾向在盆地南北有差异。研究发现该构造带与矿床、侵入碱性岩体及区域地化异常分布有密切的关系。结合地质构造分析研究,表明该构造带是一多期活动的重要构造带,具有伸展走滑的性质;中轴构造带在形成、演化过程中被近东西向的多条直线型断裂所错断,从构造形态上看与大洋中脊有相似的展布特征。该构造带对盆地的构造演化以及矿产形成具有重要控制作用。  相似文献   

一种实用的数字图像压缩方法     

解振东  章三妹 《物探化探计算技术》2006,28(4):387-389

提出以C Builder 6.0为开发平台,以其所提供的TJPEGImage为核心,实现真彩色图像的压缩,为工程实际的应用提供了一种非常实用的压缩手段。该方法减少了大量程序代码的编写工作。实验表明,当综合压缩比设为65时,压缩图像与原图像相比并无明显变化,由此可见,压缩效果令人满意。  相似文献   

A Combined-Power Model for the Distribution of Axial Force in Shaft Anchor along Its Length   总被引：1，自引：0，他引：1  

卫军  周锡武朱玉 罗昕 《中国地质大学学报(英文版)》2006,17(1):89-94

INTRODUCTIONThe anchorage of geomaterial , including shaftanchors and prestressed tendons ,is usually used ingeotechnical engineering. Owing to various advanta-ges ,these two anchorage types are widely used instructures in China ( Cao et al ., 2003 ; Fu et al .,1999 ;Lu et al .,1998 ; Li et al .,1995) . Shaft an-chors can be classifiedinto three kinds by the forceinthe shaft and cement grout :tensile ,press ,and sheartype (Lu et al .,1998) . The tensile type is the mostpopular in China…  相似文献