Two dimensional source location system for rock fall detection by using cable sensor and mobile multimedia network

Ujihira, Masuyuki; Ogawa, Kensuke; Suzuki, Shunsuke; Hosoya, Shougo; Saeki, Hiroshi; Komazaki, Masaaki

doi:10.1016/s1365-1609(97)00213-x

Cited by 4 publications

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A case study on the impact of rock fall on highway bridge

Wang

Bao

et al. 2010

2010 International Conference on Mechanic Automation and Control Engineering

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Based on the engineering properties of rock fall in mountain area, analyzed the rock fall hazards in bridge construction, rock fall formation process and the motion state of falling, bouncing, sliding, rolling. Analyzed rock fall kinematics calculation method and how it affects on bridge construction. At the end, the method was applied in a case of bridge in ShuifuMaliuwan highway in Yunnan Province, China.

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A case study on the impact of rock fall on highway bridge

Wang

Bao

et al. 2010

2010 International Conference on Mechanic Automation and Control Engineering

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Study on the Rock Fall Detection System using Steel Wire Cable Sensor and Satellite Phone-Experimental Results on the Applicability for a Cropped Slope-

Ito¹,

Ujihira

Yasuike

et al. 2003

Journal of the Japan Society of Engineering Geology

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Results of geo-engineering monitoring by Monma et al. at Amatori-hashi, West Area, Wakayama, Japan, have shown that the frequency of various scale rock falls tends to increase just before a big rock fall or a slope failure. This phenomenon has been also observed just before 2nd slope failure following the 1st failure in 1997 at No.2 Shiraito Tunnel, Hokkaido, Japan. The authors propose the frequency monitoring of small rock falls as a useful way to predict large-scale rock falls or slope failures. In this study, practical applicability of rock fall detection system using steel wire cable sensor and satellite phone was carried out. From this field study the following points were made clear:1) the proposed system is able to transmit the measured rock fall signals to a remote office. The rock fall frequency and the rock fall source could be evaluated, even when the steel wire cable sensor was stretched on the cropped slope having no net, which made easy the propagation of the rock fall impact. 2) It was confirmed that rock fall characteristics, such as the falling velocity, could be evaluated through analysis of the data registered by the field side personal computer. 3) As a result of composition study of measured waveforms, it was concluded that stretching interval of steel wire cable sensors could be increased up to 10m without deterioration of the system rock fall detection abilities.

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Study on the Improvement of the Rock Fall Detection System using Steel Wire Cable Sensor-On the Effects of Signal Cable Insertion to Measurement Circuit and Grouping of the Sensors-

Ujihira

Kenji

Ito

et al. 2006

Journal of the Japan Society of Engineering Geology

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Steel wire cable sensor (SWCS) stretched along a rock slope is effective to detect the sign of a big scale rock fall and slope failure, because the sensor could detect the collision vibrations of rock particles and blocks that appear preceded the big failure. In the conventional SWCS system, electric signals generated in SWCS are once amplified by amplifiers placed on the slope and are transmitted to the room for measurement. It is considered that practical applicability will be increased if the signals could be transmitted directly from SWCS to measurement house without amplifying on the slope, because the accidents of measurement circuit occurs mainly around the amplifiers placed on the slope. Moreover, practical applicability will be increased economically, if the number of channels of measurement instrument is decreased, grouping of plural strings of SWCS. In this study, it was examined how much length of coaxial signal transmission cable could be inserted between SWCS and amplifier in the measurement house without losing the signal characteristics. Then it was confirmed theoretically and experimentally if the output level of signal of SWCS was kept for practical use, when 4-13 strings of SWCS were grouped in parallel or in series to a channel. Results obtained from these examinations are as follows: 1) Length of coaxial signal transmission cable which could be inserted between SWCS and measurement house without pre-amplifying on the slope surface is 120m; 2) According to the field tests, rock fall behaviors could be interpreted clearly from the changes of signal waveforms, even when the coaxial signal transmission cable was inserted between SWCS and amplifier placed in the measurement house; 3) Rock fall characteristics could be identified, when the 4-13 strings of SWCS are grouped both in parallel and in series to a channel in addition to the insertion of coaxial signal transmission cable.

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Two dimensional source location system for rock fall detection by using cable sensor and mobile multimedia network

Cited by 4 publications

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A case study on the impact of rock fall on highway bridge

A case study on the impact of rock fall on highway bridge

Study on the Rock Fall Detection System using Steel Wire Cable Sensor and Satellite Phone-Experimental Results on the Applicability for a Cropped Slope-

Study on the Improvement of the Rock Fall Detection System using Steel Wire Cable Sensor-On the Effects of Signal Cable Insertion to Measurement Circuit and Grouping of the Sensors-

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