Key Laboratory of Non ferrous Resources and Geological Hazard Detection

Hunan, China

Key Laboratory of Non ferrous Resources and Geological Hazard Detection

Hunan, China

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du H.-K.,Central South University | du H.-K.,Key Laboratory of Non ferrous Resources and Geological Hazard Detection | Ren Z.-Y.,Central South University | Ren Z.-Y.,Key Laboratory of Non ferrous Resources and Geological Hazard Detection | And 2 more authors.
Studia Geophysica et Geodaetica | Year: 2016

A novel finite-volume approach for complicated 2D magnetotellurics (MT) problems with arbitrarily surface topography is presented. An edge-surface integral balance equation is derived by employing a conservation law on the generalized 2D MT boundary value problem. A triangular grid is used to discretize the 2D conductivity model so that we can deal with arbitrarily complex cases with surface topography. The node-centered finite-volume algorithm is used to derive the final system of linear equations on a dual mesh of the triangular grid, which is solved by a robust direct solver. Three synthetic models verify the accuracy of the presented finite-volume algorithm and its capability of dealing with surface topography. © 2016 Institute of Geophysics of the ASCR, v.v.i


Guo Z.-W.,Central South University | Guo Z.-W.,Key Laboratory of Non Ferrous Resources and Geological Hazard Detection | Liu J.-X.,Central South University | Liu J.-X.,Key Laboratory of Non Ferrous Resources and Geological Hazard Detection | And 7 more authors.
Progress in Electromagnetics Research Symposium | Year: 2010

As an advanced technology, Ground-Penetrating Radar (GPR) is a geophysical method based on electromagnetic wave propagation commonly used for nondestructive subsurface imaging, including thruway, glacier, permafrost and pipe. It has also been used as a geophysical method in permafrost research to map subsurface structures and composition. The Qinghai-Tibet Plateau is the world's highest plateau, averaging over 4000 meters above sea level and covering an area of 200,000 square kilometers. The Qinghai-Tibet railway has always been puzzled by permafrost. It is imperative to detect permafrost subgrade fast. Permafrost recognition algorithm was proposed with applying the rolling power spectrum. In the Central South University, we did a test. As a result, it has shown that anomalies have been significantly strengthened. The most important points of this study, related to methodology and processing, are discussed, and finally, a method is proposed using data processing for permafrost detection.


Guo Z.-W.,Central South University | Guo Z.-W.,Key Laboratory of Non Ferrous Resources and Geological Hazard Detection | Liu J.-X.,Central South University | Liu J.-X.,Key Laboratory of Non Ferrous Resources and Geological Hazard Detection | And 4 more authors.
Progress in Electromagnetics Research Symposium | Year: 2010

To survey the frozen earth roadbed of Qinghai-Tibet railway and to treat the hidden trouble of the roadbed are the important approach to steady the roadbed. And it is essential guaranteed to be open to traffic in security. According to the geological data of the typical testing section of Qinghai-Tibet railway, the field experiments are accomplished. Based on the processing results, a significant technology for practical application of ground penetrating radar in detecting frozen roadbed is useful and indispensable.


Zhang W.,Central South University | Zhang W.,Key Laboratory of Non ferrous Resources and Geological Hazard Detection | Liu J.-X.,Central South University | Liu J.-X.,Key Laboratory of Non ferrous Resources and Geological Hazard Detection | And 4 more authors.
Progress in Electromagnetics Research Symposium | Year: 2010

Induced polarization method (IP) is based on rock, ore, metal induced polarization effects to find and solve hydro-geological, engineering geological issues such as a group of electrical prospecting methods. It consists of DC-induced polarization method (time domain method) and the exchange of induced polarization method (frequency-domain method). At present, Frequency- domain induced polarization method (frequency method) because of its advantages is widely used in actual production. However, as rock, ore, induced polarization effects are very complex and affected by many factors, the current induced polarization effects very di±cult to achieve an accurate description. Therefore, interpretation of induced polarization method in data analysis problems. In the application subject to certain restrictions. Cole-Cole model is used to describe the formula-mediated electric polarization in the form of complex resistivity and induced polarization equation in the form of the same frequency charac- teristics. The use of Cole-Cole model to be more a description of the image of rock, ore, induced polarization phenomenon, as the basis of the frequency-domain IP for effective forward modeling, can accurately describe the rock, ore characteristics of the induced polarization effects, developed a suitable IP method forward simulation software.

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