矿产资源规划环境影响评价工作方法探讨   总被引：10，自引：0，他引：10  

李善峰  张进德 《地质通报》2004,23(11):1153-1156

根据《中华人民共和国环境影响评价法》关于规划的环境影响评价要求，初步探讨了矿产资源规划环境影响评价的工作思路。参照国土资源部《矿产资源规划管理暂行办法》的有关规定，列举了矿产资源规划的类型；依据《环评法》第七条和第八条，阐明了不同类型的矿产资源规划所对应的环境影响评价文件编制的要求；提出了矿产资源规划环境影响评价的工作程序和环境影响评价指标体系的建议，并简单地探讨了2种评价方法。  相似文献   

Statistical Detection and Characterization of a Deviation from the Gutenberg-Richter Distribution above Magnitude 8     

V. F. Pisarenko  D. Sornette 《Pure and Applied Geophysics》2004,161(4):839-864

— We present a quantitative statistical test for the presence of a crossover c₀ in the Gutenberg-Richter distribution of earthquake seismic moments, separating the usual power-law regime for seismic moments less than c₀ from another faster decaying regime beyond c₀. Our method is based on the transformation of the ordered sample of seismic moments into a series with uniform distribution under condition of no crossover. A simulation method allows us to estimate the statistical significance of the null hypothesis H₀ of an absence of crossover (c₀=infinity). When H₀ is rejected, we estimate the crossover c₀ using two different competing models for the second regime beyond c₀ and the simulation method. For the catalog obtained by aggregating 14 subduction zones of the Circum-Pacific Seismic Belt, our estimate of the crossover point is log(c₀)=28.14 ± 0.40 (c₀ in dyne-cm), corresponding to a crossover magnitude m_W=8.1 ± 0.3. For separate subduction zones, the corresponding estimates are substantially more uncertain, so that the null hypothesis of an identical crossover for all subduction zones cannot be rejected. Such a large value of the crossover magnitude makes it difficult to associate it directly with a seismogenic thickness as proposed by many different authors. Our measure of c₀ may substantiate the concept that the localization of strong shear deformation could propagate significantly in the lower crust and upper mantle, thus increasing the effective size beyond which one should expect a change of regime.  相似文献   

用热力学第二定律改进MM5V3的初步尝试     

徐辉  柳崇健刘英 《沙漠与绿洲气象(新疆气象)》2004,27(2):7-10

针对当今的数值预报模式中存在若干与热力学第二定律不符的问题，本文着重讨论了将该定律引入数值预报模式的必要性，并通过已引入和未引入第二定律的中尺度数值模式MM5V3两者之间的对比试验来验证在数值预报模式中引进热力学第二定律的可行性。  相似文献   

人工土层冻结法加固在盾构出洞施工中的应用   总被引：10，自引：0，他引：10  

秦爱芳  李永和 《岩土力学》2004,25(Z2):449-452

软土地区盾构出洞施工中洞口土体易失稳、渗水,上海明珠线二期工程浦东大道站至张扬路站区间,隧道在盾构出洞施工中,为确保地面建筑及地下管线的安全及正常使用,首次采用了人工土层冻结加固,取得了良好的效果;本文介绍了该工程出洞口土体加固的方案选择、关键技术处理及实际取得的效果,并探讨了人工土层冻结加固在含水松软土层的地下工程中的应用前景.  相似文献   

某滑坡软弱夹层抗剪强度取值方法的研究   总被引：3，自引：0，他引：3  

王义军  李天斌  王宝国 《中国地质灾害与防治学报》2004,15(4):25-29

文章主要针对软弱夹层抗剪强度取值所存在的争议，通过对贵州新街子滑坡的软弱夹层分别选择比例极限、屈服极限及峰值作为剪应力值，采用最小二乘法获得比例抗剪强度、屈服抗剪强度和峰值抗剪强度。以参数选取中应用较为成熟的反分析方法推求力学性质参数c、φ值作为判据对以上3种参数进行比较。计算结果表明：本滑坡软弱夹层中由于含泥量较大，而且粘塑性较强，屈服抗剪强度和反分析得到的抗剪强度偏差最小，比例抗剪强度偏差最大，峰值抗剪强度居中。并以此3种抗剪强度进行天然状态下滑坡稳定性验算，结果表明选用比例极限抗剪强度与当前滑坡的地质现象不符，选用峰值极限抗剪强度安全储备较低，而选取屈服极限抗剪强度最为合理。用此参数进行设计，滑坡已经得到了良好的治理。在取值研究中认为采用试验与反分析相结合的方法确定滑坡稳定性计算参数是比较合理的。以上结论为滑坡中软弱夹层抗剪强度取值的选择提供了重要的依据。  相似文献   

Plastic flow strength of jadeite and diopside investigated by microindentation hardness tests     

Dorothe Dorner  Bernhard Stckhert 《Tectonophysics》2004,379(1-4):227-238

Microindentation hardness tests were performed on jadeite and diopside, being end members of the omphacite solid solution series. At temperatures between 300 and 750 °C, the hardness of jadeite ranges from 7.4 to 8.5 GPa, that of diopside from 4.9 to 6.1 GPa. Jadeite is significantly stronger than diopside in the low-temperature plasticity regime. Normalization of the hardness-derived yield stress with respect to the shear modulus considerably reduces the strength contrast. The normalized Peierls stress is identical for jadeite and diopside. This indicates that jadeite and diopside belong to the same isomechanical group. The hardness-derived yield stress for jadeite as well as for diopside is used to estimate flow law parameters for the low-temperature plasticity regime.  相似文献   

曲靖市冰雹云雷达回波特征及防雹     

王涛  李静  詹继锋 《云南地理环境研究》2004,(Z1)

本文通过对曲靖市711B数字化雷达冰雹云回波特征进行分析,总结2002年～2003年曲靖市防雹工作3年取得的经验,以期提高县级防雹指挥人员雷达回波分析能力和作业指挥能力,在防雹作业中科学的安排防雹炮弹的使用量。  相似文献   

幂函数对建筑物沉降的回归分析     

于春生 《现代测绘》2004,27(4):33-34

通过实例推导幂函数对建筑物沉降进行回归分析，并且得出较为精确的结果，同时也说明在选择回归函数的时候，还会受到很多条件影响。  相似文献   

Discourse,representation and urban planning: How a critical approach to discourse helps reveal the spatial re-ordering of street sex work1     

Kate Kerkin 《The Australian geographer》2004,35(2):185-192

This paper shows how a critical approach to discourse sheds light on processes of spatial re-orderings. It uses a case study of urban planning in an area of street sex work to explore the ways in which various representations of prostitution can be used to inform planning decisions. Representations of sex worker identity also expose complex spatial and social geographies and evolving processes of marginalisation and exclusion.  相似文献   

Numerical modelling method for wave propagation in a linear viscoelastic medium with singular memory   总被引：1，自引：0，他引：1  

Jian-Fei Lu  Andrzej Hanyga 《Geophysical Journal International》2004,159(2):688-702

  相似文献