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Material Composition and Engineering Characteristics of Red Clay in Guigang, Guangxi 被引量:4
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作者 XiaoMinggui WangJieguang ChenXuejun 《Journal of China University of Geosciences》 SCIE CSCD 2005年第1期84-88,共5页
There is fine and uniform clay with aluminous and ferrous cementation in the red clay found in Guigang, Guangxi. It has the characteristics of shrinkage outwardly, rigid upper but soft lower and well grown fissure. I... There is fine and uniform clay with aluminous and ferrous cementation in the red clay found in Guigang, Guangxi. It has the characteristics of shrinkage outwardly, rigid upper but soft lower and well grown fissure. In addition there are engineering characteristics such as high water content, low compactness and low compressibility, high strength and high contractility but slight expansibility. This paper discusses the red clay's engineering characteristics and its change regulation with depth by analyzing changes in the red clay's grain size composition, mineralogical constitution, and chemical composition. 展开更多
关键词 red clay engineering characteristics grain size composition mineralogical constitution chemical ingredients.
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Research on ground heat exchanger of Ground Source Heat Pump technique
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作者 LIUDong-sheng SUNYou-hong GAOKe WUXiao-hang 《Journal of Geoscientific Research in Northeast Asia》 2004年第2期196-199,共4页
Ground Source Heat Pump technique and its operating principle are described in this paper. Ground heat exchanger is the key technique of ground source heat pump and its patterns are discussed. Software is helpful to d... Ground Source Heat Pump technique and its operating principle are described in this paper. Ground heat exchanger is the key technique of ground source heat pump and its patterns are discussed. Software is helpful to design ground heat exchanger. A project of Chinese Ground Source Heat Pump is introduced and its market is more and more extensive. 展开更多
关键词 Ground Source Heat Pump ground heat exchanger SOFTWARE DESIGN
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Processing of diamond enhanced cemented tungsten carbide insert for rock drilling
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作者 LIUBao-chang SUNYou-hong ZHANGZu-pei 《Journal of Geoscientific Research in Northeast Asia》 2004年第2期200-204,共5页
This paper introduced the structure, component and sintering procedure of the Diamond/WC-Co composite insert fabricated by high pressure and high temperature (HPHT) method as well as by hot pressing method. In HPHT me... This paper introduced the structure, component and sintering procedure of the Diamond/WC-Co composite insert fabricated by high pressure and high temperature (HPHT) method as well as by hot pressing method. In HPHT method, to avoid breakage and delamination of the diamond layer, two transition layers were added between the most outer diamond layer and the WC-Co body. The transition layers compensate for differences in thermal expansion coefficient and elastic modulus of diamond layer and WC-Co substrate. Thus reduces the residual stress induced by cooling the inserts from sintering temperature to room temperature. In hot pressing method, to decrease sintering temperature so as to protect diamond, an active sintering process which achieved by adding nickel and phosphorus into the starting mixed powder is adopted. To increase the toughness of the inserts to resist breakage, proper amount of rare earth compound, LaNi5 and CeO2, are added into the original mixed powder, too. Laboratory tests indicated that both of the diamond enhanced inserts fabricated by HPHT method and by hot pressing method have relatively high hardness and impact toughness, while their wear resistance is about hundreds of times greater than that of conventional cemented tungsten carbide inserts. The results of field drilling test indicated that the diamond enhanced inserts can meet the demands of rotary percussion drilling. 展开更多
关键词 WC-CO COMPOSITE rock drilling
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Influence of filling velocity on stability of subgrade with marine soft soil
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作者 WANGChang-ming ZHANGShu-hua FANJian-hua 《Journal of Geoscientific Research in Northeast Asia》 2004年第2期185-187,共3页
Filling velocity and thickness of soft layer are major factors affecting subgrade stability according to an example study by means of finite element stress method(FESM). A case is studied and shows that the subgrade w... Filling velocity and thickness of soft layer are major factors affecting subgrade stability according to an example study by means of finite element stress method(FESM). A case is studied and shows that the subgrade was slided because of excessive filling velocity. To determine a reasonable filling velocity is a key problem to a subgrade with marine soft soil. 展开更多
关键词 filling velocity weak subgrade stability analysis
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