MAPGIS在水文地质制图中的应用

利用功能强大的ＭＡＰＧＩＳ系统,根据水文地质图的编制特点,笔者利用ＶｉｓｕａｌＦｏｘｐｒｏ开发了ＭＡＰＧＩＳ数据接口程序ＭＡＰＨＹＤＲＯ,成功地编制了矿井综合水文地质图,为机助编制各类水文地质图提供了一条可行的途径。     

Generalised formulation of composite filters and their application to earthquake engineering test systems

This paper addresses the problem of generating unmeasured kinetic data—and/or providing improvements in existing data—for the enhancement of performance characteristics of earthquake engineering test systems, such as shaking tables, reaction walls and other custom‐made test rigs. The approach relies upon the use of composite filters (CF), a method of data fusion that was originally conceived via transfer function formulation. The current work generalises the CF concept and extends its formulation into the state‐space domain, thereby providing a wider basis for application to test systems and their controllers, including those of a multivariable (coupled, multi‐axis) nature. Comparative simulation studies of shaking table control are presented that demonstrate the design techniques for state‐space CF and also their effectiveness for signal synthesis, noise suppression and performance improvement. Specific examples include the use of CF for displacement demand signal generation, velocity feedback generation and acceleration control. In each case, the essential principles behind CF—output signals with zero bias and zero drift—are consistently upheld. Copyright © 2017 John Wiley & Sons, Ltd.     

广州市轨道交通二十一号线工程路基抗震性测试研究

传统路基动模量法大都进行单路基抗震性能分析,缺乏复合路基抗震性能分析,存在较高的偏差。对广州市轨道交通二十一号线工程路基抗震性进行测试,分析该地地质条件后,通过标准贯入实验法判断原始路基土质液化情况,使用瑞典条分法测试原始路基的抗震性能,判别出该路基液化土层滑动安全系数低、抗震稳定性差,应对其进行复合路基加固。通过圆弧滑动法对加固后的复合路基中碎石桩桩网结构路基以及CFG桩桩网结构路基进行抗震性测试。实验结果表明,所提方法抗干扰性能强且测试结果精度高。     

An averaging procedure for layered materials

In order to model thin‐layered soils a special averaging procedure is proposed. It works with very few restrictions imposed on the constitutive equations used for individual materials. General considerations are followed by an example from open pit mining industry. Geometrical non‐linearity is considered. The proposed method is not necessarily restricted to the problems of soil mechanics. It could also be applied on composite materials. Copyright © 2000 John Wiley & Sons, Ltd.     

高分异花岗岩浆可能是华南花岗岩型铀矿床主要铀源——来自诸广山南体花岗岩锆石铀含量的证据

锆石的U-Pb测年、Hf和O同位素及稀土、微量元素的研究与应用已获得诸多进展,但锆石中铀含量所蕴藏的地质意义却较少被关注。华南花岗岩型铀矿床的铀源一直存在争议,不同观点认为其分别来自早期已固结地质体、分异岩浆、地幔柱或热点以及U、Th、K富集圈。为尝试利用锆石中的铀含量来追索铀源,本文通过搜集诸广山南体花岗岩锆石U-Pb同位素测年文献,掌握了该花岗岩中14个岩体、37件样品、3种岩性,共467个锆石定年数据。通过数据分析发现印支期(253Ma、244Ma)和燕山期(139Ma、124Ma)具高分异特征的4件酸性岩脉(小岩体)样品中锆石的铀含量明显高于同期岩体。依据铀矿床中高分异酸性岩脉(小岩体)侵位期、基性岩脉侵位期、铀成矿早期(140~90Ma)三者的良好对应关系,结合这一锆石铀含量指示,初步认为华南花岗岩型铀矿床中铀可能主要来自高分异花岗岩浆;推测花岗岩型铀成矿可能属壳幔混合作用结果,即铀源来自地壳分异岩浆,成矿流体和矿化剂主要来自地幔,而成矿空间受断裂系统控制。岩体锆石铀含量或可在铀源丰度、矿床品位判别等方面发挥积极作用。     

POSSIBLE RELATIONSHIP BETWEEN ENSO AND BLOCKING IN KEY REGIONS OF EURASIA

Using reanalysis data provided by the U.S.National Centers for Environmental Prediction/National Center for Atmospheric Research,the potential relationship between the El Ni?o-Southern Oscillation (ENSO) cycle and blocking highs in three key regions of Eurasia (Ural,Baikal,and Okhotsk) from 1950 to 2008 is analyzed.Composite analysis of 500 hPa geopotential height field during different stages of ENSO reveals that in the winters of El Ni?o (EN) years,there is significant negative anomaly of geopotential height in the three key regions.In the winters of La Ni?a (LN) years,on the other hand,significant positive anomaly of geopotential height is observed in Eastern Ural,Baikal,and Okhotsk.In summer,Okhotsk exhibits positive anomaly,which is significant at a confidence level of 90% by Student’s t-test during the developing stage of an LN year.In the developing stage of an EN year,geopotential height field at 500 hPa manifests positive (negative) anomaly in Baikal (Ural and Okhotsk),while the geopotential height field at 500 hPa exhibits positive (negative) anomaly in Ural and Okhotsk (Baikal) during the decaying stage of both EN and LN years.However,these abnormities are insignificant in a developing EN year,decaying EN year,and the summer of a decaying LN year.By analyzing 500 hPa geopotential height field during different phases of the ENSO cycle,it is observed that results of the case study are consistent with those of composite analysis.Annual average blocking is likewise examined during the different stages of ENSO from 1950 to 2008.Combined with composite analysis and case study,results indicate that blockings in the three key regions are suppressed (enhanced) during the winters of EN (LN) years.In summer,the influence of ENSO on the blockings in the three key regions is not as significant as that in winter.Evidently,developing LN may enhance blockings in Okhotsk.Influence factors on blockings are various and complex.This paper indicates that the influence of ENSO on blockings cannot be neglected,and that it is crucial to related operational forecasting as a potential signal.     

复合填料热传导过程数值模拟

复合填料由废铸砂、粉煤灰、聚苯乙烯（EPS）颗粒、水泥和水按一定质量比例混合制成,具有低导热性、抗冻胀和轻质特性。根据热阻力法则和比等效导热系数相等法则,将材料视为由大量正方形单元体组成,其中心为一个球形EPS颗粒,这种单元体与总体的导热系数相等。运用AN SY S软件对复合填料单元体的传热过程进行了有限元模拟,根据瞬态法导热系数测试原理,推求不同EPS掺入比情况下的复合填料导热系数,分析EPS颗粒与导热系数的关系,发现材料导热系数随着EPS掺入比的增加而快速降低。将材料导热系数数值模拟与实测结果作比较,发现有限元模拟值与实测值接近,说明采用有限元方法可以实现对材料传热过程的模拟。     

锚杆挡土墙可靠度分析与计算方法

提出了锚杆挡墙中肋柱锚杆体系的串-并联模型。将肋柱视为连续梁,锚杆视为弹性支座,引入锚杆与锚固段周围岩土体的复合刚度系数,用位移法导出了各根锚杆所受荷载的统一计算公式。考虑各功能函数之间的相关性,运用系统可靠性理论,提出了单根锚杆3种破坏模式的串联系统与多根锚杆并联系统的体系可靠度计算方法,并编制了计算程序。对一工程实例进行计算,并对计算结果进行了分析,发现单根锚杆的3种失效模式并非相互独立,每种失效模式对锚杆可靠度的影响也不一样,而3根锚杆并联系统的失效概率近似等于在其他锚杆均未破坏的条件下每根锚杆单独失效概率之和。     

Seismic fragility analysis of composite frame structure based on performance

Steel-concrete composite structures that share the advantages of both steel structure and concrete structure have been developed rapidly and used widely. It has been a popular structure in high-rise buildings in recent years. Although more and more composite structures have been used in earthquake area, only a few literatures about fragility analysis of this type of structure are available. In this paper, a fragility analysis method based on performance is proposed, in which both the uncertainty due to vari...