Monitoring method for the aging slope by geophysical explorations

This research is monitoring the ground condition inside the aging slope. The purpose of this research is to consider the value of a monitoring method with the ground evaluating system to estimate the soundness in the aging slope. In Japan, at the high economic growth period after the 1960’s, a great number of slopes were formed to construct many roads and most slope protection methods were to cover with shotcrete on the slope. Now, those slopes are aging. Therefore, there is a possibility that the slope failures occur due to the weather and natural disaster such as climate variations, heavy rainfall and earthquake. It is important to establish the method monitoring the ground condition inside the slope to estimate the soundness in the aging slope and to effectually maintain slopes. In this research, firstly, by using elastic wave exploration and electric detection, we examined the ground condition in situs. Secondly, we changed each measured results of geophysical explorations into the porosity and the saturation with the ground evaluating system. This system uses seismic velocity – the porosity and the saturation relational expression (Wyllie 1956) and the resistivity – the porosity and the saturation relational expression (Archie 1941)

A study about the improvement of the interpretative accuracy of compound geophysical explorations by self-organizing maps

In Japan, in the high economic growth period in 1960’s, a great number of slopes were formed to construct many roads. Now, the slopes have been aging, it is important to estimate the health of the aging slope and maintain slopes effectually. So, in situs, we usually carry out seismic wave method, surface wave method, electric method, electromagnetic wave method, frequency domain electromagnetic method and so on. However, there is not the technique to compound and interpret the result of each geophysical exploration in a numerical formula of the engineering now. Therefore, we notice to self-organizing maps (SOM) used widely in a field of the information processing engineering, and tried to interpret multidimensional data by integrating. In this paper, we classified the ground property by self-organizing maps. The classification result is relatively conformal with boring data. Therefore, it is recognized that it can be used to improve the interpretative accuracy of compound geophysical explorations. And, it can be shown that this technique is effective to estimate of the ground property of the aging slope

Monitoring of ground condition into road decrepit slopes by seismic and electric prospecting

A large number of shotcrete slopes that were constructed in Japan during the 1970’s are now more than 30 years old, and there has been a significant degree of deterioration. Therefore, it is important to develop a method for monitoring the stability and the durability of these slopes. In this paper, we propose a technique that converts seismic velocity and electric resistivity data to porosity and saturation, which is then used to monitor weathering and groundwater fluctuation behind the slope. The evaluation results of this methodology confirm that the distribution of porosity and saturation of rock mass around the evaluated slope arrived at by this conversion system agree with those of the actual rock mass conditions evaluated using boring samples. In addition, it was possible to monitor the signs of seasonal variation and weathering in the ground by performing monitoring using this methodology over a period of multiple years

A trial about the evaluation of compound geophysical explorations by self-organizing maps

In Japan, in the high economic growth period in 1960’s, a great number of slopes were formed to construct many roads. Now, the slopes have been aging, it is important to estimate the health of the aging slope and maintain slopes effectually. So, in situs, we usually carry out seismic wave method, surface wave method, electric method, electromagnetic wave method, frequency domain electromagnetic method and so on. However, there is not the technique to compound and interpret the result of each geophysical exploration in a numerical formula of the engineering now. Therefore, we notice to self-organizing maps (SOM) used widely in a field of the information processing engineering, and tried to interpret multidimensional data by integrating. In this paper, we classified the ground property by self-organizing maps. The classification result is relatively conformal with boring data. Therefore, it is recognized that it can be used to improve the interpretative accuracy of compound geophysical explorations. And, it can be shown that this technique is effective to estimate of the ground property of the aging slope

A study of the compound evaluation for geophysical explorations by self-organizing maps

In Japan, in the high economic growth period in 1960’s, a great number of cutting ground and embankment slopes were formed to construct many roads. They have been aging now, it is important to estimate the health of them and maintain effectually. So, in situs, we usually carry out many kinds of the geophysical exploration. However, there is not the technique to compound and interpret the result of each geophysical exploration in a numerical formula of the engineering now. Therefore, we notice to self-organizing maps (SOM) used widely in a field of the information processing engineering, and tried to interpret multidimensional data by integrating. In this paper, we classified the ground property by SOM. The classification result is relatively conformal with boring data. Therefore, it is recognized that it can be used to improve the interpretative accuracy of compound geophysical explorations.12th ISRM International Congress on Rock Mechanics "Harmonizing Rock Mechanics and the Environment" 18-21 October 2011, Beijing, Chin

ダイ46ジ ナンキョク チイキ カンソクタイ キショウブモン ホウコク 2005

この報告は,第46次南極地域観測隊気象部門が,2005年2月1日から2006年1月31日まで昭和基地において行った気象観測結果をまとめたものである.観測方法,測器,統計方法等は第45次隊とほぼ同様である. 越冬期間中,特記される気象現象として,次のものが挙げられる.1) 地上気象観測において,2005年の年平均相対湿度73は高い方から,年平均雲量7.5は多い方からの極値を更新し,年平均風速7.2m/sは大きい方から,年合計雪日数228日は多い方から第2位の記録となった.2) ブリザードの回数は,A級6回,B級9回,C級15回の計30回で平年並みだったが,5月は過去最多の5回を記録した.3) 昭和基地上空のオゾン全量日代表値は,8月下旬から10月中旬までオゾンホールの目安となる220m atm-cm以下の値を継続的に下回り,9月の月平均値は173m atm-cmで,過去4番目に少なかった.10月4日には越冬中の最低値である136m atm-cmを記録した.This report describes the results of meteorological observations at Syowa Station from February 1st, 2005 to January 31st, 2006, carried out by the Meteorological Observation Team of the 46th Japanese Antarctic Research Expedition (JARE-46). The observation methods, instruments and statistical methods used by the JARE-46 were almost the same as those used by the JARE-45 observation team. Remarkable weather phenomena observed during the period of JARE-46 are as follows.1) Annual mean relative humidity and cloud amount in 2005 at Syowa Station were 73 and 7.5, both records for Syowa Station. Annual mean wind speed and number of snow days were 7.2m/s and 228 days, both second highest values.2) There were 30 blizzards of which 6 were class A, 9 class B and, 15 class C, typical of a normal year.3) The amount of total ozone over Syowa Station became lower than or equal to 220m atm-cm from the end of August to mid-October. Monthly mean amount of total ozone in September was 173m atm-cm, which was the 4th lowest value in the historical record. On 4th October, the amount of total ozone was 136m atm-cm, which was the lowest value during JARE-46

自己組織化マップを用いた 物理探査の複合評価手法に関する研究

近年では，老朽化法面の健全度を評価するために，様々な物理探査が着目されている．単独の物理探査による地山の物理的情報では地山状態を解釈するのに限界があり，解釈限度を補間するために複数の物理探査が用いられることが多い．そこで本研究では，自己組織化マップ（Self-Organizing Maps : SOM）を用いて複数の物理探査データのクラスター分類評価を試みた．さらに，著者らが提案する弾性波速度と比抵抗の変換解析による間隙率と飽和度との比較から，各クラスターが有する地盤物性値についても定量的に評価した．各クラスターの分布はボーリング調査による地盤情報と整合性が高く，また変換解析を併用することで，定性的かつ定量的な複合評価が可能であることが示された．講演番号1

Results of the search for inspiraling compact star binaries from TAMA300's observation in 2000-2004

We analyze the data of TAMA300 detector to search for gravitational waves from inspiraling compact star binaries with masses of the component stars in the range 1-3Msolar. In this analysis, 2705 hours of data, taken during the years 2000-2004, are used for the event search. We combine the results of different observation runs, and obtained a single upper limit on the rate of the coalescence of compact binaries in our Galaxy of 20 per year at a 90% confidence level. In this upper limit, the effect of various systematic errors such like the uncertainty of the background estimation and the calibration of the detector's sensitivity are included.Comment: 8 pages, 4 Postscript figures, uses revtex4.sty The author list was correcte

Observation results by the TAMA300 detector on gravitational wave bursts from stellar-core collapses

We present data-analysis schemes and results of observations with the TAMA300 gravitational-wave detector, targeting burst signals from stellar-core collapse events. In analyses for burst gravitational waves, the detection and fake-reduction schemes are different from well-investigated ones for a chirp-wave analysis, because precise waveform templates are not available. We used an excess-power filter for the extraction of gravitational-wave candidates, and developed two methods for the reduction of fake events caused by non-stationary noises of the detector. These analysis schemes were applied to real data from the TAMA300 interferometric gravitational wave detector. As a result, fake events were reduced by a factor of about 1000 in the best cases. The resultant event candidates were interpreted from an astronomical viewpoint. We set an upper limit of 2.2x10^3 events/sec on the burst gravitational-wave event rate in our Galaxy with a confidence level of 90%. This work sets a milestone and prospects on the search for burst gravitational waves, by establishing an analysis scheme for the observation data from an interferometric gravitational wave detector