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浅议综合物探的作用和意义 被引量:3
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作者 徐定才 《科技传播》 2009年第8期10-10,共1页
物探—地球物理勘探的简称,它之所以能够解决或查明有关地质和工程问题,是因为所要探测的地质对象与周围介质间存在某种物性差异,而这种物性差异可影响被寻找地质体周围某种天然或人工物理场的分布特征,物探技术就是利用先进的物探仪器... 物探—地球物理勘探的简称,它之所以能够解决或查明有关地质和工程问题,是因为所要探测的地质对象与周围介质间存在某种物性差异,而这种物性差异可影响被寻找地质体周围某种天然或人工物理场的分布特征,物探技术就是利用先进的物探仪器来摄取这些物理场的分布并与均质条件下的物理场相比较,找出差异的部分来研究与勘探对象之间的关系,达到解决地质问题或工程问题之目的。本文简述地球物理勘探的原理,并说明合理地应用综合物探,可提高物探成果的解释精度,并取得最佳的经济效益,满足工程之需。 展开更多
关键词 综合物探 物探原理 工程勘察应用
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Integrated Geophysical and Geotechnical Investigations for Earth Dam along Dansak River, Upper Shemankar River Basin, Jos Plateau, Central Nigeria
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作者 Longpia Cedric Bernard Dakwo Philip Datsok Pam Bulus Gwom 《Journal of Earth Science and Engineering》 2014年第8期470-483,共14页
A total of 60 VES (geo-electrical resistivity soundings) and ten exploratory core holes (boreholes) were carried out along the axis of a proposed earth dam site as part of an overall geotechnical investigation for... A total of 60 VES (geo-electrical resistivity soundings) and ten exploratory core holes (boreholes) were carried out along the axis of a proposed earth dam site as part of an overall geotechnical investigation for the design and construction of an earth dam along Dansak River, Shemankar River Basin, Jos Plateau, Nigeria. The geophysical interpretation revealed four to five geo-electric layers corresponding to lithologic units (1) topsoil from 0-2 m with a resistivity value of 〈 100-320 ohm-m, (2) weathered/slightly weathered basalt fi'om 0.6 m to 20 m characterized by resistivity value of 27-130 ohm-m, followed by (3) basalt/fractured basalts with resistivity value of 130-400 ohm-m and (4) the basement rocks with resistivity value 〉 320 ohm-m to 3,021 ohm-m. Exploratory borehole drilling encountered a series of lithologic units viz: overburden (clay, silt and sand) weathered basalt, slightly weathered basalt, fresh/fractured basalts, weathered migmatite and migmatites/migmatite gneiss. Exploratory core analysis in terms of CR (core recovery) and RQD (rock quality designation) revealed an average of 70%-90% and 75%-90%, respectively. Lugeon test gave Lugeon values of 1-5 for the ten core holes. However, fractures with Lugeon value from 〉 5-15 lugeon were encountered on borehole numbers BH 1, 7, 8, 9 and 10. Grouting is recommended to seal this shallow to medium depth (0-15 m) fractures to reduce or eliminate possible seepage when the dam is constructed. The rock mass index grading for the dam axis ranges from good to excellent. 展开更多
关键词 Geo-electrical resistivity GEOTECHNICAL Dansak River rock quality designation rock mass index Lugeon test.
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Seismic Data Processing and Interpretation on the Loess Plateau, Part1: Seismic Data Processing
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作者 蒋茄钰 付守献 李九灵 《Applied Geophysics》 SCIE CSCD 2005年第4期241-246,共6页
Branching river channels and the coexistence of valleys, ridges, hiils, and slopes'as the result of long-term weathering and erosion form the unique loess topography. The Changqing Geophysical Company, working in the... Branching river channels and the coexistence of valleys, ridges, hiils, and slopes'as the result of long-term weathering and erosion form the unique loess topography. The Changqing Geophysical Company, working in these complex conditions, has established a suite of technologies for high-fidelity processing and fine interpretation of seismic data. This article introduces the processes involved in the data processing and interpretation and illustrates the results. 展开更多
关键词 loess plateau seismic data processing STATICS bin optimization noise attenuation data interpretation
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Partial and Spectral-Viscosity Models for Geophysical Flows
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作者 Qingshan CHEN Max GUNZBURGER Xiaoming WANG 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2010年第5期579-606,共28页
Two models based on the hydrostatic primitive equations are proposed.The first model is the primitive equations with partial viscosity only,and is oriented towards large-scale wave structures in the ocean and atmosphe... Two models based on the hydrostatic primitive equations are proposed.The first model is the primitive equations with partial viscosity only,and is oriented towards large-scale wave structures in the ocean and atmosphere.The second model is the viscous primitive equations with spectral eddy viscosity,and is oriented towards turbulent geophysical flows.For both models,the existence and uniqueness of global strong solutions are established.For the second model,the convergence of the solutions to the solutions of the classical primitive equations as eddy viscosity parameters tend to zero is also established. 展开更多
关键词 Primitive equations Partial viscosity Spectral-eddy viscosity
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