Application of the DDM and fracture mechanics model on the simulation of rock breakage by mechanical tools

A DDM (displacement discontinuity method) program coupled with a modified energy criterion is used to simulate the development of cracks and chips by indentation tools. In our analysis a cavity model is applied to represent the expansion of crushed rock to the surrounding rock and the cracks are formedin two-dimensional and quasi-static conditions. The model parameters, rock properties and load magnitudes are varied in the numerical calculations. The results show that chips are formed by multiple mechanisms of either tension or shear, or their combinations. The cracks may either propagate to the free surface to form chips or rest in the rock subsurface. The crack development is dependent upon rock and fracture properties, loading force and tool characteristics. The DDM is a convenient tool in the study of rock fragmentation and cracks.     

灰色系统理论在二连洪浩尔舒特凹陷储层评价中的应用

本文利用测井资料,依据测井地质评价油气储层的分析准则,提出灰色理论精细评价油气储层的处理方法和解释系统。通过二连洪浩尔舒特凹陷储层的精细评价和综合解释,取得了明显的效果。文中介绍了这一分析方法处理过程及实用效果。     

Locked in stresses,creep and dilatancy of rocks,and constitutive equations

SummaryLocked in Stresses, Creep and Dilatancy of Rocks, and Constitutive Equations A micro rheological analysis is presented of the deformation characteristics of rocks based on the multi mineral and polycrystalline structure of igneous metamorphic and some sedimentary rocks; in addition the polygranular structure of sandstone-type rocks is also considered. Due account is taken with the history of rock formation and tectonics.Torsional creep test results on Ichang sandstone are presented and analysed. A new method of testing is introduced whereby the sample is subjected to a step wise loading function and the deformation measured as a function of the time. In this manner the creep as a function of stress and time can be obtained very easily from tests on only one sample.A hypothesis is presented on the origin and formation of locked in stresses the release of internal strain energy is studied at the hand of some typical test results. The practical importance of these stress pockets is discussed and it is stressed that creep and locked in stresses are fundamental factors in the behaviour of rocks which must be carefully studied in practice.On the basis of experimental results and physical reasoning constitutive equations are set up, which are three dimensional generalisations of the experimental Griggs equation: =a +b logt +ct, whereby the material parameters are scalar functions of the stress invariants.

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ZusammenfassungRestspannungen, Kriechen und Dilatation von Gesteinen, und Ausgangsgleichungen Es wird eine Analyse der rheologischen Verformungseigenschaften von Fels gezeigt, die auf dem Mineral- und Kristallgefüge von metamorphen Erstarrungs-und einigen Sedimentgesteinen beruht; außerdem wird das Korngefüge von Gesteinen mit einem Aufbau ähnlich dem von Sandsteinen berücksichtigt. Ebenso werden Gebirgsbildungsvorgänge und Tektonik beachtet.Ergebnisse von Torsionskriechversuchen an Ichang-Sandstein werden vorgelegt und analysiert. Eine neue Versuchsmethode wird vorgestellt, wobei der Probekörper einer stufenweise gesteigerten Belastung unterworfen wird und die Verformungen als Funktion der Zeit gemessen werden. Auf diese Weise wird durch Versuche mit nur einem Probekörper das Kriechen als Funktion der Belastung und der Zeit ermittelt.Es wird eine Hypothese über den Ursprung und die Bildung von Restspannungen vorgelegt. An Hand von typischen Versuchsergebnissen wird die Freiwerdung von innerer Verzerrungsenergie untersucht und die praktische Bedeutung von Kriechvorgängen und Restspannungen betont.Basierend auf Versuchsergebnissen und physikalischen Gesetzen werden Ausgangsgleichungen aufgestellt, die Verallgemeinerungen der experimentell von Griggs gefundenen Gleichung =a +b logt +ct in 3 Dimensionen darstellen. Dabei sind die Materialparameter skalare Funktionen der Invarianten des Spannungszustandes.

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RésuméFluage et dilatation des roches, contraintes figées dans le massif et relatiens de comportement On présente une analyse micro-rhéologique des caractéristiques de déformation des roches, basée sur la structure multiminérale et polycristalline des roches ignées ou métamorphiques et de quelques roches sédimentaires. La structure polygranulaire des roches du type des grès est aussi envisagée. On prend en compte l'histoire de la formation des roches et de la tectonique.Des résultats d'essais de fluage en torsion sur des grès d'Echang sont données et analysés. On présente une nouvelle méthode d'essais où l'échantillon est soumis à un chargement par échelon et où la déformation est mesurée en fonction du temps. De cette façon, le fluage en fonction des contraintes et du temps peut être obtenu très facilement à partir d'essais sur un seul échantillon.On présente une hypothèse sur l'origine et la fonction des contraintes figées dans le massif et le relachement de l'énergie de déformation est étudié au moyen de résultats d'essais typiques. L'importance pratique de ces noyaux de contraintes est discutée et l'on montre que le fluage et les contraintes figées sont des facteurs fondamentaux du comportement des roches qui doivent être étudiés avec soin dans la pratique.A partir de résultats expérimentaux et au moyen de raisonnements physiques, on établit les relations de comportement et la généralisation à trois dimensions de l'équation expérimentale de Griggs =a +b logt +ct où les paramètres du matériau sont des fonctions scalaires des invariants des contraintes.

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With 8 Figures     

准四年周期的北半球夏季遥相关与东亚夏季风环流的相互关系

利用ＮＭＣ的２００ｈＰａ和８５０ｈＰａ风场资料研究了北半球夏季遥相关和东亚夏季风异常环流在准４年时间尺度上的相互关系。研究发现当北半球夏季出现积雪强迫型遥相关时,东亚－西太平洋地区既存在异常纬向环流,也存在异常经向环流;而当出现东亚太平洋型遥相关时,东亚－西太平洋地区以异常纬向环流为主。分析还发现源于北太平洋的异常涡旋在向南传播的过程中,先取西南路径,在到达菲律宾东部以后折向东南。     

A Statistical Study of Rapid Sunspot Structure Change Associated with Flares

We reported recently some rapid changes of sunspot structure in white-light(WL) associated with major flares.We extend the study to smaller events and present here results of a statistical study of this phenomenon.In total,we investigate 403 events from 1998 May 9 to 2004 July 17,including 40 X-class,174 M-class,and 189 C-class flares.By monitoring the structure of the flaring active regions using the WL observations from the Transition Region and Coronal Explorer(TRACE),we find that segments in the outer sunspot structure decayed rapidly right after many flares;and that,on the other hand,the central part of sunspots near the flare-associated magnetic neutral line became darkened.These rapid and permanent changes are evidenced in the time profiles of WL mean intensity and are not likely resulted from the flare emissions.Our study further shows that the outer sunspot structure decay as well as the central structure darkening are more likely to be detected in larger solar flares.For X-class flares,over 40% events show distinct sunspot structure change.For M-and C-class flares,this percentage drops to 17% and 10%,respectively.The results of this statistical study support our previously proposed reconnection picture,i.e.,the flare-related magnetic fields evolve from a highly inclined to a more vertical configuration.     

数字抽取滤波器的DSP优化设计

为了降低地震数据采集系统的成本和功耗，采用数字信号处理器（DSP）实现∑-△模数转换器中的数字抽取滤波器算法。通过采取查表法、倒序循环遍历法以及模拟循环寻址法等优化方法，以较低工作频率实现了四通道四级抽取滤波运算，达到了系统设计的要求。     

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RS CVn型双星的自转测量和研究(Ⅱ)

我们用美国McDonald天文台2.1米反光镜Coude Reticon观测,对31个RS CVn型双星系统的37颗子星的自转进行了测量。并结合以前测得的38颗子星的数据,对RS CVn型星是否同步作了统计分析,结果表明,绝大多数都显示出同步自转性质;但无论是短周期、正常周期还是长周期组的,都有少数与同步自转不一致的例子。这与过去认为短周期和正常周期的呈同步自转,而长周期的呈非同步自转的结论不一致。     

Molecular cloning of the heat shock protein 20 gene from Paphia textile and its expression in response to heat shock

P. textile is an important aquaculture species in China and is mainly distributed in Fujian, Guangdong, and Guangxi Provinces. In this study, an HSP20 c DNA designated Pt HSP20 was cloned from P. textile. The full-length c DNA of Pt HSP20 is 1 090 bp long and contains a 5′ untranslated region(UTR) of 93 bp, a 3′ UTR of 475 bp, and an open reading frame(ORF) of 522 bp. The Pt HSP20 c DNA encodes 173 amino acid residues and has a molecular mass of 20.22 k Da and an isoelectric point of 6.2. Its predicted amino acid sequence shows that Pt HSP20 contains a typical α-crystallin domain(residues 77–171) and three polyadenylation signal-sequences at the C-terminus. According to an amino acid sequence alignment, Pt HSP20 shows moderate homology to other mollusk s HSPs. Pt HSP20 m RNA was present in all of the test tissues including the heart, digestive gland, adductor muscle, gonad, gill, and mantle, with the highest concentration found in the gonad. Under the stress of high temperature, the expression of Pt HSP20 m RNA was down-regulated in all of the tissues except the adductor muscle and gonad.