Multiple-point statistical prediction on fracture networks at Yucca Mountain     

Xiaoyan Liu  Chengyuan Zhang  Quansheng Liu  Jens Birkholzer 《Environmental Geology》2009,58(6):1361-1370

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高放废物处置库预选区新构造运动特征     

黄贤男  付检生  李斌志  高阳  何建国  李建中  徐国庆 《国外铀金地质》2010,(2):96-105

新构造活动强烈程度是高放废物处置库场址评价的一个重要指标。本文阐述新构造研究的指导思想、方法及其在高放废物处置库选址中的应用。通过东天山地区南、北地段对比研究,选出了在新近纪时期构造环境相对稳定或新构造活动强度相对微弱的东天山南部地区,作为高放废物处置库基地。研究结果表明它对场址评价是有意义的。  相似文献   

中国地震台网中心机构知识库构建方案初探     

张晋辉 《国际地震动态》2013,(12):29-36

文章首先介绍了机构知识库的概念和由来,以及机构知识库的国内外建设现状,然后针对中国地震台网中心的现状,提出了台网中心构建机构知识库的建设方案,并探讨了方案中涉及的若干关键问题.最后,指出了方案实施面临的主要困难并提出了解决方法.  相似文献   

REST-based semantic feature catalogue services     

Kim Tracy Finney  David Watts 《International journal of geographical information science》2013,27(9):1507-1524

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新疆天山地区活动构造特征及区域地壳稳定性分析     

黄贤芳  何建国  高洪雷  李建中  田明明  徐国庆 《国外铀金地质》2012,(1):16-26

区域地壳稳定性是高放废物处置库选址的重要指标之一。基于我国新疆天山地区的活动构造特征及其与地震空间分布关系的研究,对研究区地壳稳定性进行分析,选出相对稳定的＂安全岛＂地区,为高放废物处置库选址提供依据。  相似文献   

In-situ Measurements of Cutter Forces on Boring Machine at Äspö Hard Rock Laboratory Part II. Characteristics of Cutter Forces and Examination of Cracks Generated     

Z. X. Zhang  S. Q. Kou  P.-A. Lindqvist 《Rock Mechanics and Rock Engineering》2003,36(1):63-83

Summary By means of spectral analysis, the measured normal forces, tangential forces, and side forces acting on two button cutters on the boring machine in ?sp? Hard Rock Laboratory were analysed and the basic characteristics of the cutter forces were determined. After the measurements of the cutter forces, some rock core samples were taken from the bottom and the wall of the test borehole. These samples were cut, polished, and examined by means of a Scanning Electron Microscope (SEM). The lengths of the major cracks in the rock samples were measured, and a relation between the length of the median cracks and the relevant cutter forces was investigated. Received October 5, 2001; accepted June 25, 2002; Published online November 19, 2002  相似文献   

New techniques in rock mass classification: application to welded tuffs at the Nevada Yucca Mountain     

R. J. Watters  J. R. Carr  D. M. Chuck 《Geotechnical and Geological Engineering》1990,8(3):241-260

Summary Many rock mass classification systems exist to assist the engineer in assessing the rock support requirements for underground design. On-going research in this area is directed at attempting to utilize the fractal dimension and the acoustic emission response of the tuffs at the Nevada Yucca Mountain to further aid in rock mass classification. Acoustic emission response is shown to be correlated with the porosity of the sample. Engineering behaviour of the rock varies dramatically with porosity; events and peak amplitude offer a means to distinguish between fracture porosity and pore porosity and consequently the engineering behaviour of the rock. Fractal dimension is used to characterize the roughness of fracture surfaces. Two fractal dimension calculation methods, one based on the semi-variogram for the surface and the other based on the use of dividers, are applied for this purpose. The divider method is shown to resolve deviation from a straight line; the semi-variogram method is shown to identify statistical similarity to various types of noise.Nomenclature D fractal dimension - AE acoustic emission - b b-value determined from log(frequency) against log(amplitude) plots - (h) semi-variogram function - h lag distance for semi-variogram function - H an exponent term related to fractal dimension asD=2 –H  相似文献   

Porewater chemistry in compacted bentonite: Application to the engineered buffer barrier at the Olkiluoto site     

《Applied Geochemistry》2016

Compacted bentonite is used as sealing and buffer material in engineered barrier systems (EBS) of high-level radioactive waste repositories. The chemical characteristics of this clay and its porewater affect the migration of radionuclides eventually released from the waste. They also determine the integrity and long-term performance of the clay barriers. Key features are the structural negative charge and the large proportion of structural (interlayer) water of the main mineral montmorillonite, which leads to exclusion of anions and a surplus of cations in a large part of the porosity space. The objective of this contribution was to assess the impact of different porosity model concepts on porewater chemistry in compacted bentonite in the context of the planned Finnish spent nuclear fuel repository at Olkiluoto. First, a structural model based on well-established crystallographic and electrostatic considerations was set up to estimate the fractions of the different porosity types. In view of the uncertainty related to the chemical properties of the interlayer water, two very different model concepts (anion-free interlayer, Donnan space), together with a well-established thermodynamic model for bentonite, were applied to derive the porewater composition of the bentonite buffer at Olkiluoto. The simulations indicate very similar results in the “free” water composition for the two models and thus support the validity of the reference porewater concept commonly used in performance assessment of waste repositories. Differences between the models are evident in the composition of the water affected by the surface charge (i.e. diffuse double layer and interlayer). These reflect the conceptual uncertainty in current multi-porosity diffusion models.  相似文献   

高放废物地质处置库的特点及其结构型式     

罗嗣海  钱七虎  王驹 《地质科技情报》2007,26(5):83-90

总结了高放废物地质处置库在系统组成、经费投入、时间跨度、功能要求、评价目标、作用营力、影响范围、工程数量、工程布局、工程逆转和社会影响等方面有别于一般深部岩石地下工程的特点.以美国、瑞典、日本、比利时、法国的处置库概念设计为例,介绍了各国处置库的结构型式,比较了其异同点,并对我国的处置库概念设计提出了初步建议.  相似文献   

核废料地质处置概念库锚喷支护坑道热-水-应力耦合效应的二维离散元分析   总被引：1，自引：0，他引：1  

张玉军  徐刚 《岩土力学》2013,34(Z1):430-436

假定一个核废料地质处置库位于具有一定水头的饱和节理岩体中,开挖完闭施作系统锚杆和喷混凝土支护。对坑道建造和一个50年期的热-水应力（T-H-M）耦合运营过程,使用UDEC程序进行数值模拟,分析无、有支护时近场围岩中的应力、变形、塑性区、温度、渗流的变化状态,以及不同场（温度、渗流、应力）耦合条件下的锚杆和喷混凝土中的承载情况。结果显示,喷混凝土和系统锚杆支护不仅具有常规的支护功能,并且可阻滞地下水从坑道表面的自由渗出,使得围岩中塑性区减小,裂隙水压力和温度升高;相比于应力单场作用的情况,在热-水-力耦合的条件下洞室围岩的稳定性下降,支护结构的受力状况变差。  相似文献