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奇点附近渗透出逸坡降的测定 被引量:1
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作者 吴世余 赵殿信 +1 位作者 张安家 谢公理 《水利水电技术》 CSCD 北大核心 2001年第10期7-9,共3页
奇点附近的渗透出逸坡降甚大,且沿深度变化甚快,在模型试验中难以测定.应用理论分析结合电拟试验,提出了一简便又有一定精度的测试方法.虽然此方法仅适用于施测奇点附近的小区域,但由于奇点附近小区域的出逸坡降甚大,为整体工程渗流稳... 奇点附近的渗透出逸坡降甚大,且沿深度变化甚快,在模型试验中难以测定.应用理论分析结合电拟试验,提出了一简便又有一定精度的测试方法.虽然此方法仅适用于施测奇点附近的小区域,但由于奇点附近小区域的出逸坡降甚大,为整体工程渗流稳定的控制区,因此,本测定方法有一定的实用价值. 展开更多
关键词 渗流 电拟试验 出逸坡降 测定方法 区域 奇点附近 渗透
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透水地基上填土成层土坝的渗流特性及加固措施的研究
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作者 赵淑敏 傅琼华 《江西水利科技》 1992年第2期123-132,共10页
本文以黄泥埠土坝断面为研究代表,对填土成层土坝进行了无防渗设施、垂直防渗、水平防渗、坝下游挖排水沟及防排结合的十多组方案的渗流电拟试验,并且分析了不同防渗措施的渗流状态,基本摸清了透水地基上填土成层土坝的渗流特性,提出了... 本文以黄泥埠土坝断面为研究代表,对填土成层土坝进行了无防渗设施、垂直防渗、水平防渗、坝下游挖排水沟及防排结合的十多组方案的渗流电拟试验,并且分析了不同防渗措施的渗流状态,基本摸清了透水地基上填土成层土坝的渗流特性,提出了这类土坝分别采用以防为主、挖排水沟及防排结合加固方案,其适用条件及采用相应的渗流控制措施时应注意的问题,为治理这种特殊类型土坝的险情提供了科学的依据。 展开更多
关键词 透水地基 土坝 渗流 电拟试验 加固
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Water abundance of mine floor limestone by simulation experiment 被引量:2
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作者 Yang Cai Liu Shengdong Liu Lu 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第3期495-500,共6页
The water abundance of mine floor limestone needs to be solved urgently as the average depth of coal mining in China has increased gradually. A method is presented to discuss water abundance with the numerical and phy... The water abundance of mine floor limestone needs to be solved urgently as the average depth of coal mining in China has increased gradually. A method is presented to discuss water abundance with the numerical and physical layered geoelectrical model being established in the half-space, full-space and full-space with tunnel, respectively. The parameters of water abundance are changed in this study, which includes water quantity, water content and volume of abnormity of water-containing abnormity. Results indicate that the different work fields have different macroscopic influences on the apparent resistivity,and the water abundance parameters of water-containing abnormity have quantitative relationship with the apparent resistivity mean in abnormal regions(three-dimensional space region). The quantitative relationships are shown as following: firstly, the amount of water injection has negative linear correlation with the apparent resistivity mean; secondly, when abnormity is unsaturated, there is a negative power function relationship between water content and apparent resistivity mean; thirdly, the volume of abnormity and apparent resistivity mean behave as a decreasing power function law. 展开更多
关键词 Quantification Water abundance Mine floor limestone Apparent resistivity Numerical simulation and physical simulation
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A miniature pump with a fluid dynamic bearing 被引量:4
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作者 LUO XianWu JI Bin +3 位作者 ZHUANG BaoTang ZHU Lei LU Li XU HongYuan 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第3期795-801,共7页
This paper describes the development of a miniature pump having an impeller with an exit diameter of 24 mm supported with the motor rotor by a fluid dynamic beating. Tests verify that the miniature pump is stable and ... This paper describes the development of a miniature pump having an impeller with an exit diameter of 24 mm supported with the motor rotor by a fluid dynamic beating. Tests verify that the miniature pump is stable and quiet for rotational speeds larger than 4000 rain-1. The three-dimensional turbulent flow in the entire pump flow passage and the laminar flow in the fluid dynamic bearing were then simulated numerically. The average pump performance was well predicted by the simulations. Both the tests and the simulations show that there is no obvious Reynolds effect for the miniature pump within the tested range of rotational speeds. The numerical results also show that the beating capacity of the fluid dynamic bearing increases with the pump rotor rotational speed and the eccentricity ratio of the journal to the bushing. This pump is very compact, so it is a prom- ising device for surgical use. 展开更多
关键词 miniature pump fluid dynamic bearing hydraulic performance EXPERIMENT numerical simulation
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