A study on evaluating rock slope stability by remotely-positioned Laser Doppler Vibrometers

Saito, Hideki; Tsuji, Masaki; Ohtsuka, Y.; Uehan, Fumiaki; Murata, Osamu; Ma, Guojun; Sawada, Kazuhide; Yashima, Atsushi; Fukata, Takahiro

doi:10.1190/segj102011-001.94

Cited by 2 publications

(3 citation statements)

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“…Although the above methods are widely used in the research and application of large-scale structural damage identification, their application in the evaluation of perilous rock stability is still in its infancy. Saito et al found that the stability of perilous rock is closely related to dynamic characteristics [26]. Ma et al found that the bonding area was positively correlated with the natural vibration frequency [27].…”

Section: Introductionmentioning

confidence: 99%

Stability Evaluation of Sliding-Type Perilous Rock in Huangzangsi Hydrojunction Project Based on Natural Vibration Frequency

et al. 2023

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The instability of perilous rock is mostly manifested as sudden collapse and failure without obvious displacement characteristics. Therefore, it is difficult to achieve the purpose of monitoring and early warning by conventional displacement monitoring. But the existing stability monitoring indicators are mostly deformation, stress, and strain. There is a problem that the stability evaluation parameters are inconsistent with the monitoring parameters. Taking sliding-type perilous rock as the research object, the structural plane is assumed to be homogeneous and isotropic, and linear elastic deformation in the amplitude range. Based on the dynamic theory and limit equilibrium model, the quantitative relationship model can be established involving safety factors, natural vibration frequency, structural surface bonding area, elastic modulus, and mass. The remote laser vibrometer is used to monitor the natural vibration frequency of the sliding-type perilous rock on the slope of the Huangzangsi Hydrojunction, and the stability evaluation of the perilous rock is achieved based on the quantitative relationship model between the safety factor and the natural vibration frequency. In this way, the frequency of slipping perilous rock stability evaluation and safety factor can be monitored. The results are basically the same with the safety factor calculated by the limit equilibrium method, indicating that the method is correct and feasible. The research has high theoretical significance and practical value for the safety monitoring and advanced warning of sliding perilous rock.

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Section: Introductionmentioning

confidence: 99%

Stability Evaluation of Sliding-Type Perilous Rock in Huangzangsi Hydrojunction Project Based on Natural Vibration Frequency

et al. 2023

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“…For the purpose of performing stability evaluation of rock slope effectively and safely, the writers developed a rock block stability evaluation method using a remote LDV (laser Doppler vibrometer) [4][5][6][7][8].…”

Section: Introduction mentioning

confidence: 99%

“…Photograph and model of Case 6Q. Example of the block vibration analysis.Red line: Upper part; Green line: Lower part the observation level (51 Hz)[5].…”

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confidence: 99%

Experimental and Numerical Analysis of Rock Block Stability Using a Remotely Positioned Laser Doppler Vibrometer

Ma¹,

Sawada²,

Yashima³

et al. 2014

JCEA

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This paper examines a new method of evaluating the stability of a rock slope using a remotely positioned LDV (laser Doppler vibrometer). We conducted an experiment using physical models and performed a numerical analysis to evaluate the new method. The physical model included: (1) concrete blocks on an artificial soil slope with two block sizes and three slopes; (2) concrete blocks bonded to the concrete base with different contact area. The LDV measurements agreed with conventional seismometer measurements. The dominant frequency of the blocks varied with the stability and dominant frequency and the amplitude varied with the block size. The numerical model was used to examine a concrete block adhered to a concrete base with different contact areas. The dominant frequency of the blocks determined using the numerical model agreed with those obtained from the physical experiments. We analyzed different sized blocks to examine the scaling effects. The dominant frequency of the blocks was inversely related to the block size. These results demonstrated the effectiveness of LDV for evaluating the stability of rock slopes and cleared the block size scaling effects.

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A study on evaluating rock slope stability by remotely-positioned Laser Doppler Vibrometers

Cited by 2 publications

References 1 publication

Stability Evaluation of Sliding-Type Perilous Rock in Huangzangsi Hydrojunction Project Based on Natural Vibration Frequency

Stability Evaluation of Sliding-Type Perilous Rock in Huangzangsi Hydrojunction Project Based on Natural Vibration Frequency

Experimental and Numerical Analysis of Rock Block Stability Using a Remotely Positioned Laser Doppler Vibrometer

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