Beziehungen zwischen Gesteinsdeformation und Schallgeschwindigkeiten     

Professor Dr. Werner Plessmann  Prof. Dr.-Ing. Gerhard Spaeth 《International Journal of Earth Sciences》1972,61(3):1010-1019

Zusammenfassung Im Rheinischen Schiefergebirge verlaufen die höchsten Schallgeschwindigkeiten normalerweise parallel b. Taucht bei starker Verformung eine Faser in Richtung a auf, liegen die schnellsten Schallimpulse in a. Die Anordnung der Phyllosilikate ist Ursache dieser Anisotropie.

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In the Rheinisches Schiefergebirge the seismic velocities in most cases are parallel b. In regions with a strong deformation and a linear element in a, the highest velocities correspond with the same direction. This anisotropy is caused by the position of the phyllosilicates.

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Résumé Dans le Massif schisteux rhénan, les ondes sonores ont normalement leur plus grande vitesse de propagation dans la direction parallèle à « b ». Dans les roches tectoniquement déformées et caractérisées par une linéation selon « a », la plus grande vitesse se retrouve dans cette direction. Cette anisotropie est causée par la disposition des phyllosilicates.

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1956年1月9日至14日在中国的北京和匈牙利的索坡倫两处同时观测大地电流的结果          下载免费PDF全文

K.康達士  秦馨菱 《地球物理学报》1956,5(2):79-92

在不久以前關於大地電流場的研究曾受到了一番鼓舞。C.和M.斯郎波澤曾指出大地電流是一個新的地球物理勘探法的基礎,因此人們已經注意研究這些電流的本質和它們與地磁及天電的關係。闕於這一方面的基本文獻是M.斯郎波澤和G.孔湼茲的論文,在此論文里也包含着關於大地電流的振盪的研究。這篇論文是根據在  相似文献   

MOVING AND STAGNATION OF DEBRIS FLOW     

YU Bin Associate Professor  Institute of Mountain Hazards  Environment  Chinese Academy of Science  P. O. BOX . Chengdu.  PR China. 《国际泥沙研究》1997,(3)

LINTRODUCTIONThedebrisflowisaverycomplexflow.Itdiffersfromwaterflowandsuspendedflowinmovingandstagnation.Thedebrisflowisgenerallydiscribedasthegravityflowofsoil.rock,waterandinitiatedbylandslide,usuallyduetohighrunoffflow.Theoccurrenceofdebrisflowisratherunpredictableandverydestwhve.Debrisflowcouldmovefasterthanthemorecommonlandslideandtendto~tareasatmuchgreaterdistancefromthesourceofhazard.Debrisflowdisastershavebeenrecognizedasacriticalproblemfacingtheworldtodayandincreasingattentionha…  相似文献   

STABILITY ANALYSIS OF COFFERDAM SLUMP AND ITS APPLICATION IN THE CLOSURE OPERATION OF THREE GORGES PROJECT   总被引：1，自引：0，他引：1  

WANG Guangqian Professor  Dept. of Hydraulic Engineering  Tsinghua University  Beijing  China ZHOU Hougui Senior Engineer  Gezhouba Group Corporation  Yichang Hubei  China LIU Lubo Master Student  Dept. of Hydraulic Engineering  Tsinghu 《国际泥沙研究》1997,(3)

I.INTRODUCTIONTheclosureoperationofThreeGorgesprojectisfamousintheworldforitslargedischarge,deepwater,lowvelocityinclosuregaps,largequantitiesandhighintensityforfillingmaterials.Thus,thedikeconstT'Uctionintheclosureoperationprocessisverydifficult.Sothedesign,researchandconstrUctiongroupshavepaidmuchenergyinthedesignprinciplesandoptimalitymeasuresofthegrandriverclosureoperation.FromtheexperimentsofhydraulicsanddikeslumpinthesecondperiodofclosureoperationattheResearchinstitUteofYangtZeR…  相似文献   

Moon mass approximation in algebraic form analogous to activity sphere formula     

Professor of Aerospace Engineering Irving Michelson 《Pure and Applied Geophysics》1966,63(1):105-108

Summary The concept of comet orbit activity sphere as introduced byD'Alembert and developed byLaplace is modified and applied to the Sun-Earth-Moon system, leading to a new approximate relationship between astronomical constants usually regarded as independent quantities. When Sun-Earth mass ratio, the astronomic unit, and Earth-Moon separation distance are taken as known, an elementary algebraic formula gives the Earth-Moon mass ratio in terms of these. Despite the inherently imprecise character of this type of calculation, surprisingly close numerical agreement with independently determined values is obtained. The great simplicity and directness of the result contrast with ardous orthodox inference procedures for the lunar mass, suggesting that newer methods of general dynamic analysis are required in the study of asymptotic states of the three-body problem.  相似文献   

Postbuckling of Imperfect Stiffened Cylindrical Shells Under Combined External Liquid Pressure and Axial Compression     

Shen Huishen Professor 《中国海洋工程》1996,(4)

- posthuckling analysis is presented for the stilTened cylindrical shell of finite length subjected to combined loading of external liquid pressure and axial compression. The formulations are based on a boundary layer theory of shell buckling, which includes the effects of nonlinear prebuckling deformations, nonlinear large deflections in the postbuckling range and initial geometrical imperfections of the shell. The "smeared stifl'cner" approach is adopted for the stiffencrs. In the analysis a singular perturbation technique is used (o determine the interactive buckling loads and the postbuckling paths. Numerical examples cover the performance of perfect and imperfect, stringer and ring stiffened cylindrical shells. Typical results arc presented in the dimcnsionless graphical form.  相似文献   

Statistical Distributions of Wavelengths     

Yu Dingyong Xu Delun Ph. D. Student  Engineering College  Ocean University of Qingdao  Qingdao Professor  Physical Oceanography Laboratory  Ocean University of Qingdao  Qingdao 《中国海洋工程》1997,(3)

The statistical distribution of wavelength is directly derived from a two-dimensional andspatially homogeneous Gaussian wave field.The present result differs from both the result of Rayleigh dis-tribution and Sun's result(1988b)which is transformed through the period distribution derived from atwo-dimensional and stationary Gaussian wave field.A laboratory experiment shows that the present re-sult is more consistent with the observations in the wave tank than the others.  相似文献   

Analysis of Dynamic Stability of Ocean Gravity Structure Foundations     

He Guangna  Cao Yalin Professor  Dalian University of Technology  Dalian . Former Postgruate Student  Dalian University of Technology  Dalian 《中国海洋工程》1995,(2)

Based on unified equivalent harmonic loading on seabed foundation and energy approach suggested by the authors, the development of dynamic pore water pressure and stability of soil foundation for the vibration of ocean gravity structures excited by random wave loading are analysed. It may be seen that the present method for the study of dynamic problems of ocean gravity structure soil foundations is more reasonable and convenient.  相似文献   

Calculation of Wave Pressure and Pressure Spectrum for Perforate-Pipe Breakwater   总被引：1，自引：0，他引：1  

Li Chunzhu  Shi Hongda  Yu Dingyong Wang Aiqun Professor  Engineering College  Ocean University of Qingdao  Qingdao Lecturer  Engineering College  Ocean University of Qingdao  Qingdao Senior Engineer  Engineering College  Ocean University of Qingdao  Qingdao 《中国海洋工程》1997,(1)

Standing waves are formed due to the reflection when waves meet vertical wall,thereforestrong structures are needed to keep the wall stability under the serious wave attack.For the improvementof the working condition and increase of the stability of the wall,the lower reflecting breakwaters have at-tracted close attention Reports mostly from Japanese researchers are often concerned with the wall ofcaisson equipped with open windows.In this paper a kind of hollow-pipe perforated breakwater is exam-ined which waves may partially perforate into the harbour basin.The wave in front of the wall can onlyform partial standing wave and wave force is reduced obviously.And the theoretical calculation of waveforce and analysis of wave force spectrum are all derived.Comparison between the results from theoreticalcalculation and hydraulic modeling shows reasonable agreement.  相似文献   

Determination of Partial Factors of Breast Wall on Top of Sloping Breakwater     

Lu Jianghua Xie Shileng Engineer  Planning  Design Institute for Water Transportation  Ministry of Communications  Beijing Professor  Senior Engineer  First Design Institute of Navigation Engineering  Ministry of Communications  Tianjin 《中国海洋工程》1996,(4)

- By applying the theory of structural reliability, reliability analyses for the stability of a breast wall on the top of a sloping breakwater are carried out. Based on the analyses, the method for determining partial action / load factors and partial resistance factors of breast walls is expounded, and the design expressions with partial factors are given. The values of partial action / load factors and partial resistance factors are recommended preliminarily according to the computation for breast walls with typical cross-sections.  相似文献