Microseismic Monitoring of the Left Bank Slope at the Baihetan Hydropower Station, China

Dai, Feng; Li, Biao; Xu, Nuwen; Meng, Guotao; Wu, Jiayao; Fan, Yilin

doi:10.1007/s00603-016-1050-9

Cited by 64 publications

(17 citation statements)

References 13 publications

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“…In the design of rock engineering structures, understanding and preventing rock fracture initiation and propagation are significant for maintaining structural stability and for avoiding geologic hazards. [1][2][3] On the other hand, in the rock engineering applications related to cutting, fragmentation, and hydraulic fracturing, methods are sought to improve rock-breaking efficiency. For these purposes, rock fracture mechanics has been established and quickly developed.…”

Section: Introductionmentioning

confidence: 99%

An experimental and theoretical comparison of CCNBD and CCNSCB specimens for determining mode I fracture toughness of rocks

Wei

Dai

Liu

et al. 2017

Fatigue Fract Eng Mat Struct

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The cracked chevron notched Brazilian disc (CCNBD) specimen, suggested by the International Society for Rock Mechanics for testing mode I fracture toughness of rocks, usually yields rather conservative toughness measurements, and the reasons have not been fully explored. In this study, the CCNBD method is compared with the cracked chevron notched semicircular bending (CCNSCB) method in the fracture process zone (FPZ) and its influence on the fracture toughness measurement. Theoretical analysis reveals that the FPZ is longer in the CCNBD specimen than in the CCNSCB specimen using a relatively large support span, the toughness measurement using the former is affected more seriously by the presence of FPZ, and thus the CCNBD method is usually, more or less, conservative compared with the CCNSCB method. These inferences are further validated by experimental results, which indicate that the CCNBD test indeed produces much lower fracture toughness values and even the results of 75‐mm radius CCNBD specimens are still lower than those of 25‐mm radius CCNSCB specimens. Consequently, due to smaller FPZ, the CCNSCB specimen with a relatively large span is more likely to produce comparably accurate or representative toughness value, and it may be more suitable than the CCNBD specimen for the engineering applications that require more representative or less conservative fracture toughness.

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Section: Introductionmentioning

confidence: 99%

An experimental and theoretical comparison of CCNBD and CCNSCB specimens for determining mode I fracture toughness of rocks

Wei

Dai

Liu

et al. 2017

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…The characteristics of the main interlayer rock mass and faults are listed in Tables 1 and 2, respectively. According to in situ stress measurements, the maximum principal stress is σ 1 = 8-11 MPa, the medium principal stress is σ 2 = 7-9 MPa, and the minimum principal stress is σ 3 = 6-8 MPa [25][26][27].…”

Section: Project Overviewmentioning

confidence: 99%

“…The MS monitoring system produced by the Engineering Seismology Group, Canada was adopted in the project. The system was installed completely on 10 November 2014 [27,30]. The multipoint extensometers were successfully installed and commissioned on 14 December 2014.…”

Section: Ms Parameter Embeddingmentioning

confidence: 99%

Deformation Analysis of Large-Scale Rock Slopes Considering the Effect of Microseismic Events

et al. 2019

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To research the macroscopic deformation of rock microseismic damage, a high-precision microseismic monitoring system was established on the left bank slope of the Baihetan hydropower station in Southwestern China. Based on the microseismic monitoring and field deformation data, the seismic source radius was applied to characterize the rock fracture scale. Numerical simulations introduced the rock micro-fracture information into the three-dimensional numerical model of the left bank slope and established the damage constitutive model. The unloading deformation process of the left bank abutment rock mass is described by numerical calculations. The feedback analysis method considering the effect of microseismic damage is preliminary exploratory research, which provides a new idea for the stability analysis of similar high rock slopes.

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“…Microseismic (MS) monitoring technology, as an advanced dynamic disaster monitoring method, has been widely used in deep-buried tunnels [1], coal mines [2], underground chambers [3], rock slopes [4] and other engineering fields. Sensors are used to receive vibration signals induced by mass rock rupture.…”

Section: Introductionmentioning

confidence: 99%

Microseismic Signal Denoising via Empirical Mode Decomposition, Compressed Sensing, and Soft-thresholding

Dong

et al. 2020

Applied Sciences

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Microseismic signal denoising is of great significance for P wave, S wave first arrival picking, source localization, and focal mechanism inversion. Therefore, an Empirical Mode Decomposition (EMD), Compressed Sensing (CS), and Soft-thresholding (ST) combined EMD_CS_ST denoising method is proposed. First, through EMD decomposition of the noise signal, a series of Intrinsic Mode Functions (IMF) from high frequency to low frequency are obtained. By calculating the correlation coefficient between each IMF and the original signal, the boundary component between the signal and the noise was identified, and the boundary component and its previous components were sparsely processed in the discrete wavelet transform domain to obtain the original sparse coefficient θ. Second, θ is filtered by ST to get the reconstruction coefficient θnew after denoising. Then, CS was used to recover and reconstruct θnew to get the denoised IMFnew component and then recombined with the remaining IMF components to get the signal after denoising. In the simulation experiment, the denoising process of EMD_CS_ST method is introduced in detail, and the denoising ability of EMD_CS_ST, DWT, EEMD, and VMD_DWT under 10 different noise levels is discussed. The signal-to-noise ratio, signal standard deviation, correlation coefficient, waveform diagram, and spectrogram before and after denoising are compared and analyzed. Moreover, the signals obtained from the underground cavern of the Shuangjiangkou hydropower station were denoised by the EMD_CS_ST method, and the signals before and after denoising were analyzed by time-frequency spectrum. These results show that the proposed method has better denoising ability.

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Microseismic Monitoring of the Left Bank Slope at the Baihetan Hydropower Station, China

Cited by 64 publications

References 13 publications

An experimental and theoretical comparison of CCNBD and CCNSCB specimens for determining mode I fracture toughness of rocks

An experimental and theoretical comparison of CCNBD and CCNSCB specimens for determining mode I fracture toughness of rocks

Deformation Analysis of Large-Scale Rock Slopes Considering the Effect of Microseismic Events

Microseismic Signal Denoising via Empirical Mode Decomposition, Compressed Sensing, and Soft-thresholding

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