... attenuation decrease drastically within the first 14 curing ages and maintain steadily thereafter. The energy proportion manifests no change in the same waveform with the increment of curing ages, but the proportion taken by high-frequency harmonic wave increases. The crossing point of energy proportion...

... experiment hydraulic fracture filtration seismic vibration frequency environmental science 861 conference society iop publishing iop conf proppant efficiency 11th Conference of Asian Rock Mechanics Society IOP Publishing IOP Conf. Series: Earth and Environmental Science 861 (2021) 022042 doi...

..., the horizontal deformation of rocks or soil mass is limited. reservoir geomechanics poisson earthquake engineering structural geology geological subdiscipline conference soil dynamic geologist thickness society iop publishing iop conf engineering deformation plate tectonics frequency...

... sustainability reservoir characterization society iop publishing iop conf geologist social responsibility amplitude structural geology liquefaction frequency environmental science 861 acc conference characteristic plate tectonics sustainable development time farm fourier...

... wireless sensor frequency information Abstract Landslide poses a great threat to the safety of local communities, engineering construction and operation. Accurate monitoring and successful early-warning of rapid landslides using conventional techniques with constant and sparse sampling strategy...

... characteristics of the slope body were investigated based on a frequency domain by analyzing the natural frequencies and corresponding vibration modes of different models. The results show that the tunnel excavation affects the slope's dynamic response characteristics and natural frequency but has little effect...

... is related to the frequency and the wall thickness, while the inner diameter has little effect. In the range of 0∼170 kHz, the signal attenuation increases with the frequency. In the range of 170∼512 kHz, the higher the frequency and the thicker the wall, the greater the signal attenuation is. (2) Guided...

... method has better noise reduction effect on the high-frequency monitoring data than that of low-frequency monitoring data, and the multi-source dynamic risk analysis model has a good prediction effect on the water leakage risk of tunnel lining in unfavourable ground condition. 1. Introduction...

... of large earthquakes. plate tectonics reservoir characterization structural geology geological subdiscipline discontinuity society iop publishing iop conf conference foundation frequency geologist reservoir geomechanics environmental science 861 application figure 6 mechanism national...

... Abstract It is difficult to monitor the change of rock stability effectively and warn of the damage of rocks by using external deformation indicators. The article analyzed the change of the cantilevered rock's natural frequency during its stability decline and proved that the rock's natural...

... subdiscipline environmental science 861 tunnel tunnel axis frequency 11th Conference of Asian Rock Mechanics Society IOP Publishing IOP Conf. Series: Earth and Environmental Science 861 (2021) 042083 doi:10.1088/1755-1315/861/4/042083 Study on the influence of transient unloading on surrounding rock...

... aggregates were generated by means of determining the locations of aggregates randomly. The modal analysis of the rock models was conducted to reveal their vibration characteristics. Simulation results indicated that the smaller the aggregate size, the larger the high-frequency composition of sound...

... stick-slip failure of rock joint mainly depends on rock types, and its failure type changes with the increase in the normal stress. The post-peak stick-slip phase has the same failure type and dominant frequency range as those of the shear load peak phase. Thus, the post-peak stick-slip failure can...

... characteristics of the echo signal of the layered structure, the frequency domain spectrum obtained by the traditional fast Fourier transform (FFT) shows multiple peaks, which makes it difficult to extract the main frequency. Thus, the wavelet transform (WT) is selected because it can realize the multi-scale...

.... The influence of the blast center distance on the blasting action can be reduced by reducing the charge amount of the cut hole and increasing the number of free surfaces. The main frequency of the vibration velocity is distributed at ∼15–110 Hz and the attenuation of a high frequency seismic wave is fast...

... Abstract The identification of R wave is helpful to analyze damage characteristics and damage analysis of nearby building caused by blasting seismic waves. According to the characteristics of low frequency, low speed and strong amplitude of R wave, a time-frequency filter for R-wave...

... was evaluated. The results show that the amplitude of the vibration velocity of existing structures along the line resulting from the blasting process ranges from 0.4 to 71.8 mm/s, and the amplitude of the vibration frequency ranges from 22.7 to 166.7 Hz. More attention should be paid to structures with natural...

... layer and the interface between bedrock and overburden are damaged to a certain extent under the action of a small-intensity earthquake ( a peak = 0.03–0.06 g), although the overburden surface is not damaged. With the increase of seismic frequency and slope height, the permanent displacement...

... of long perimeters such as underground tunnels. In this paper, we propose a DAS-based method for the recognition of disturbance events along tunnels. The EMD denoising algorithm is employed to optimize vibration signals to better extract the time–frequency domain features of monitored events. Different...

... occurrence behaviors due to rock failure by using the particle flow code (PFC) method. The AE event, AE amplitude, AE frequency, and b-value that are measured by using PFC are able to simulate the actual rock failure. The simulated rock burst signals are closely related to the AE measurements obtained from...