MS—Φ215绳索取心钻具在煤层气井的应用     

常兴浩  宋凯 《煤田地质与勘探》1996,24(5):61-62

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栗新小区浅层湿陷性地基的处理     

周文芝  宋雪琳 《河北地质学院学报》1996,19(2):175-179

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席状岩浆房中的岩浆冷却及动力稳定性   总被引：4，自引：0，他引：4  

张正阶  宋谢炎 《岩石学报》1996,12(1):1-16

关于岩浆房中岩浆的结晶分异方式一直存在着争议，其基本矛盾在于对岩浆冷却历史及热不稳定性可能引起的对流形式的理解各不相同。本文在充分考虑席状岩浆房的基本物理特征的基础上，建立了稳定岩浆体系的动态冷却模型，并以攀枝花层状岩体为例，计算了相应的温度场、密度场及粘度场。同时，提出了一种基于能量守恒的、对热不稳定性进行分析的新方法。计算了热不稳定性可能引起的对流强度、对流区域及对流时间，并深入讨论了在一定的热不稳定状态下，不同的岩浆屈服强度对对流特征参量的影响。结果表明，在该岩体的整个固化过程中，如果曾发生过自发对流，其对流也是极微弱而短暂的，不会影响中下部岩浆房中岩浆的固化和结晶。这一结论与对该岩体的实际观察相符。  相似文献   

胶南地块的隆升—伸展构造   总被引：5，自引：0，他引：5  

杨天南  宋明春 《山东地质》1997,13(1):67-76

岩石学及同位素地质学研究均表明，含榴辉岩的胶南地块在高温高压变质后经历过快速降压过程。这一过程在构造上 表现为隆升－展构造。这种构造在胶南地块有两种形：其一为地块内部的垂向缩短、水平向伸展构造，以浅色脉体的变形为特征，并反映出从深层次向浅层次的转化；另一为地块为部的正型构造带，  相似文献   

横穿贝加尔湖山脉北部寒区的线性工程     

I.Y. Malchikova 《冰川冻土》2004,26(Z1):206-209

The development of North Transbaikalye mineral resources (e. g. the Chiney deposit of iron titanium-vanadium-magnetite ores and Udokan copper deposits) is impossible without the establishment of industrial and transport infrastructure, one component of which are linear engineering constructions (drive railways, by-line auto roads, platform passages, protecting constructions, and others). However,on condition of spreading permafrost rocks this is conjugated with certain ecological risk just as from the transport network objects so for the objects themselves. A special attention is paid in the paper to considering of problems of projecting and constructing railways on the Udokan ridge.  相似文献   

探测冰盖和多年冻土层的融冰探头研发     

Norbert I. K 《冰川冻土》2004,26(Z1):310-318

The exploration of ice sheets by melting vertical holes into the ground has some tradition in terrestrial glaciology. Such probes have been used since the 1960's to investigate the vertical structure of the ice in Greenland and Antarctica and in alpine glaciers. In this paper we look into the possibility to develop similar devices for use on extraterrestrial icy bodies, like e.g. the polar areas on Mars or the icy satellites of the outer solar system. We report on some basic experiments performed in the cryo-vacuum laboratory of the Space Research Institute of the Austrian Academy of Sciences, Graz. In these experiments the penetration of a simple melting probe into compact and porous water ice (with a snow-like texture) was monitored, both under vacuum conditions and under air pressure. The observed penetration speeds for a given power supply are compared with a simple mathematical model. We conclude that a miniature melting probe with small overall dimensions and a reasonable power demand could well be part of the payload of a future planetary mission, for example to the poles of Mars. Such missions are currently under discussion in several space agencies. Moreover such probes could also e? ectively be used in terrestrial environments. A possible design is presented at the end of the paper.  相似文献   

论非均匀断层滑动弱化速率的标定     

H．Rerfettini M．Campillo I．Ionescu王文旭  胡凤英郭德科 赵爱华 《世界地震译丛》2004,(6):33-38

尝试用二维断层模型来描述断层在不稳定开始时滑动弱化速率的定标律。断层由一系列受滑动摩擦力作用变弱的片区组成，这些片区被牢固的障碍体所分隔。第一组断层包含不同尺度总滑动长度相同的片区的平均分布，而第二组断层由各种分形康托尔集合组成。破裂的整体活动性质由指数增长率λ来描述。对无限均匀的断层，系数λ由摩擦定律的弱化速率控制。在非均匀断层系中我们估算每一个断层的弱化速率，因为一个断层系的指数增长率λ与均匀断层是一致的。利用这种均匀断层的破裂过程，我们根据不同尺度均匀性断层和给定的系数λ来计算弱片区上的弱化速率。对于大尺度的破裂，弱化速率与尺度无关，长片区的开始过程类似于无限断层的破裂情况。本文考虑的是小尺度和所有不同几何形状的破裂，弱化速率记为α=β0^*／a，其中a为破裂尺度或者单个断层长度的一半，β0^*≈1．158。本文计算了滑动弱化距离Dc的值，在此基础上讨论了计算结果的物理含义，并给出了这个参数与尺度相关的可能解释。  相似文献   

主题鲜明振奋精神——湖北省气象局举办“创新、和谐、发展”演讲比赛     

陆铭  谢赛 《湖北气象》2005,(3):F0003-F0003

中国共产党诞辰84周年前夕，为了大力弘扬“奉献兴业、管天为民”的湖北气象人精神．集中展示全省气象部门三个文明建设的丰硕成果．推进湖北气象文化建设，湖北省气象局举办了以“创新、和谐、发展”为主题的演讲比赛。来自全省各市、直管市气象局和省局直属各单位的25名选手会聚江城、登台比拼。预赛之后．10名选手脱颖而出。  相似文献   

Analytical exploration of γ-function explicit method for pseudodynamic testing of nonlinear systems     

张顺益  宋裕祺 《地震工程与工程振动(英文版)》2005,4(1):117-127

It has been well studied that the γ-function explicit method can be effective in providing favorable numerical dissipation for linear elastic systems. However, its performance for nonlinear systems is unclear due to a lack of analytical evaluation techniques. Thus, a novel technique is proposed herein to evaluate its efficiency for application to nonlinear systems by introducing two parameters to describe the stiffness change. As a result, the numerical properties and error propagation characteristics of the γ-function explicit method for the pseudodynamic testing of a nonlinear system are analytically assessed. It is found that the upper stability limit decreases as the step degree of nonlinearity increases; and it increases as the current degree of nonlinearity increases. It is also shown that this integration method provides favorable numerical dissipation not only for linear elastic systems but also for nonlinear systems. Furthermore, error propagation analysis reveals that the numerical dissipation can effectively suppress the severe error propagation of high frequency modes while the low frequency responses are almost unaffected for both linear elastic and nonlinear systems.  相似文献   

A precise monitoring of snow surface height in the region of Lambert Glacier basin-Amery Ice Shelf,East Antarctica   总被引：2，自引：0，他引：2  

I.Allison 《中国科学D辑(英文版)》2005,48(1):100-111

The net surface snow accumulation on the Antarctic ice sheet is determined by a combination of precipitation, sublimation and wind redistribution. We present a one-year record of hourly snow-height measurements at LGB69 (70°50'S, 77°04'E, 1850 m a.s.l.). east side of Lambert Glacier basin (LGB), and 4 year record at G3 (70°53'S, 69°52'E, 84 m a.s.l.), Amery Ice Shelf (AIS). The measurements were made with ultrasonic sensors mounted on automatic weather stations installed at two sites. The snow accumulation at LGB69 is approximately 70 cm. Throughout the winter, between April and September, there was little change in surface snow height (SSH) at the two sites. The negative SSH change is due to densification at LGB69, and is due to both ablation and densification at G3. The strongest accumulation at two sites occurred during the period between October and March (accounting for 101.6% at LGB69), with four episodic increasing events occurring during 2002 for LGB69, and eight events during 1999-2002 for G  相似文献