Analytical Theory for One-Dimensional Consolidation of Soil Induced by Time-Dependent Pumping and Loading     

Kang-He Xie  Yu-Lin Wang  Yue-Bao Deng 《Marine Georesources & Geotechnology》2013,31(4):328-350

Analytical solutions are derived for one-dimensional consolidation induced by time-dependent pumping and loading, in which both the effects of different pumping types and loading conditions are considered, i.e., step pumping, cyclic pumping, constant loading, and step loading. Based on the solutions obtained, some diagrams are prepared and the relevant consolidation behavior of soil is discussed in detail. It has been shown that the consolidation behavior is greatly influenced by pumping velocity, loading pressure, pumping and loading type.  相似文献   

俄罗斯贝加尔湖-日本仙台断面地震波速结构及其地质意义   总被引：1，自引：1，他引：0       下载免费PDF全文

于平  关晓坤  赵震宇  杨宝俊  丁见焕  冯晅  刘万崧 《地球物理学报》2012,55(10):3277-3284

本文以中俄、俄日学者合作所得到的地球物理资料为主,结合其它相关地质-地球物理数据,组构了俄罗斯贝加尔湖-日本仙台(BS)4000 km长断面,用于区域性大尺度地研究东北亚洲地壳结构和一系列地质构造问题.研究BS断面地震波速结果表明:(1)西伯利亚板块和黑龙江板块地壳结构变化较大,并可分为上、中、下部地壳,欧亚板块东部陆缘带地壳结构较简单,基本两分.贝加尔裂谷带下部地壳厚度比松辽盆地的薄约7 km,而上部地壳则相反,前者的比后者的厚约9 km.两个裂谷带在Moho界面之下的波速分布差异也较大.(2)结合前人认识,综合分析认为,贝加尔裂谷带属主动式裂谷,松辽盆地属于混合型裂谷.贝加尔裂谷形成动力主要来自地球构造圈B″层物质上涌所形成的地幔热柱的垂向作用,由BLV带佐证,松辽盆地形成动力主要来自太平洋板块斜向俯冲的中远程效应.(3)日本国所位于的西太平洋岛弧带是多地震带,除了太平洋板块俯冲产生的浅部效应、地壳中断裂与流体的直接作用等因素,本文指出仙台等速块的物性条件是岛弧带的主要不稳定因素.同时指出需要关注日本东海岸深约30~40 km的大级次地震的发生.  相似文献   

地震分析软件震相走时表文件结构研究     

李万金 《地震研究》2012,35(2):288-294,296

通过对现有地震分析软件所配置的震相走时表文件的结构类型及优劣进行分析,将震相走时表分为4种组合结构并分析其实用性。在IASPEI91震相走时表文件结构的基础上进行修改、补充和完善,从而提出了一种安全性高、适用面广、灵活性强、能存储各种结构走时表的新型走时表文件结构。应用这种新型结构震相走时表,地震分析软件可以灵活配置不同的走时表,实现精细定位,并为数字化测震台网快速利用测震资料编制和应用高精度的区域震相走时表创造了条件,对于地球深部构造研究具有一定的促进意义。  相似文献   

地下结构抗震计算地基弹簧系数取值方法研究   总被引：4，自引：0，他引：4  

李英民  王璐  刘阳冰  刘立平 《地震工程与工程振动》2012,32(1):106-113

荷载-结构模型是地下结构抗震计算中常采用的模型,模型中地基弹簧系数的确定是关键。为了简便、可靠地计算地基弹簧系数,在已有基床系数计算公式的基础上,建立了地基弹簧系数的经验计算公式,以有限元分析结果为数据基础,对公式的系数进行拟合,将公式拓展用于成层土体。选取算例验证了建议公式的合理性和准确性,分别采用建议公式、日本抗震准则公式以及有限元法计算了某地铁区间站结构的地基弹簧系数,并对在此基础上计算所得的地震作用下结构的内力进行了对比分析。  相似文献   

一维水驱油恒压驱替渗流过程推导     

刘海龙 《东北石油大学学报》2012,(3):90-95,10,11

为研究常规砂岩油田注水开发过程中的多油层开采动态、层间干扰、开发效果分析等,对一维水驱油恒压驱替渗流过程进行理论推导.结果表明:在采出端见水前,通过油水两相区压力、纯油区压力及总压差之间关系,结合Buck-ley-Leverett方程,建立累计注入量与注入时间的关系,以及见水前位置、时间、含水饱和度之间的数学关系,求解前缘位置、前缘压差、注入速度等参数随时间的变化;在采出端见水后,分析注入速度与采出端含水饱和度关系、累计注入量与采出端含水饱和度关系,以及采出端含水饱和度与时间的关系,建立见水后位置、时间、含水饱和度之间的数学关系,求解见水后出口端含水饱和度、注入速度等参数随时间的变化.该结果为驱替过程中各物理量随时间的变化、含水饱和度的分布、各物理量之间的理论关系等研究提供指导.  相似文献   

Estimation of snow density using full-polarimetric Synthetic Aperture Radar (SAR) data     

《Physics and Chemistry of the Earth》2015

In this paper, a new snow density estimation methodology is proposed for full-polarimetric Synthetic Aperture Radar (SAR) data. The generalized four component polarimetric decomposition with unitary transformation (G4U) based generalized volume parameter is utilized to invert snowpack dielectric constant using the Fresnel transmission coefficients. The snow density is then estimated using an empirical relationship. Six Radarsat-2 fine resolution full-polarimetric C-band datasets were acquired over Himachal Pradesh, India. The near-real time in-situ measurements were collected with the satellite pass to validate the proposed method. The mean absolute error (MAE) of the proposed method is 0.027 g cm⁻³ and the root mean square error (RMSE) is 0.032 g cm⁻³. The snow density variation within a season were also analyzed using multi-temporal Radarsat-2 data.  相似文献   

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杨江  徐春阳  吴涛  周云耀  杜为民 《大地测量与地球动力学》2010,30(5):153-155

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Estimation of groundwater residence time and recession rate in watershed of the Loess Plateau     

ZHU Ruirui  ZHENG Hongxing  LIU Changming 《地理学报》2010,20(2):273-282

Groundwater residence time is an important indicator of hydrological cycle and essential for water resources development and utilization. In this paper, groundwater residence time in non-flood season, flood season and water year has been determined from daily streamflow hydrograph of ten hydrological stations in Wudinghe River Basin located in the middle reaches of the Yellow River Basin. Results have showed that: baseflow recession constant in Wudinghe River Basin ranges from 0.72 to 0.94 with a larger recession rate in flood season than that in non-flood season. Spatially, the recession rate of baseflow in loess area is the biggest, but is the smallest in the sandy area. The half-residence time of groundwater varies from 1.8 to 45.5 days while overall residence time of groundwater is between 34 and 342 days in different sub-basins of the Wudinghe River Basin. The annual average overall residence time of groundwater decreases from 117 days in the upper reaches to 73 days in the lower reaches.  相似文献   

Metal Ion Extraction with Bipyridine Derivatives as Chelating Ligands in Supercritical Carbon Dioxide     

Hai‐Jian Yang  Hakwon Kim  Cun‐Yue Guo 《洁净——土壤、空气、水》2010,38(2):159-166

Three fluorinated bipyridine ligands have been designed and synthesized as chelating agents for the extraction of metal ions in supercritical CO₂ (sc‐CO₂). The ligand solubilities in sc‐CO₂ were investigated at different temperatures and pressures, and the measured data have been correlated using a semiempirical model. The calculated results showed satisfactory agreement with the experimental data. Based on these data, metal ion extraction with the three compounds as chelating agents in sc‐CO₂ was performed from spiked filter paper, whereby ligand 1 showed the highest extraction efficiency, especially for Ni²⁺ and Cu²⁺. The extraction constants, K_ex, of the three chelating ligands were seen to increase with increasing extraction efficiency for the same metal ion in the same extraction system.  相似文献   

陀螺经纬仪的仪器常数随温度漂移规律的研究     

王飞  邓向瑞  李广云  范百兴 《武汉大学学报(信息科学版)》2011,(3):289-292

对某型陀螺经纬仪的仪器常数受环境温度的影响进行实验,利用数理统计方法分析、处理了各温度下仪器常数的数据,发现其变化符合线性规律,从而可实现温度对仪器常数的漂移影响的自动补偿。  相似文献