Characteristics of microseismic b-value associated with rock mass large deformation in underground powerhouse caverns at different stress levels

Li, Biao; Ding, Quan-fu; Xu, Nuwen; Dai, Feng; Xu, Yongbin; Qu, Honglue

doi:10.1007/s11771-022-4946-4

Cited by 28 publications

(6 citation statements)

References 44 publications

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“…e results showed that LERR can satisfactorily predict the intensity of a rockburst and the depth of the outburst pit. Li et al [15] constructed a high-precision microseismic monitoring system in two typical underground powerhouse caverns with different in situ stress levels and analyzed the b value and time variation microseismic characteristics of the large deformation of surrounding rock. e existing research is mainly based on microseismic monitoring technology to monitor and warn the strain-type rockburst during underground cavern excavation, and there are very few studies on the frequency and characteristics of slip-type rockburst microseismic events.…”

Section: Introductionmentioning

confidence: 99%

Research on Temporal and Spatial Distribution Characteristics of Microseismic Events of Slip-Type Rockburst

Xu¹,

Song

Song³

et al. 2022

Shock and Vibration

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Based on the microseismic monitoring data of underground cavern of Shuangjiangkou Hydropower Station, the internal relationship between rockburst and microseismic events is analyzed and the occurrence mechanism of slip-type rockburst in underground cavern of Shuangjiangkou Hydropower Station is analyzed through the change of microseismic monitoring b value to warn the risk level of rockburst. The results show that microseismic events are closely related to excavation activities, and the change of b value reflects the rockburst risk level. The smaller the b value of microseismic events is, the more large magnitude events is and the greater the possibility of rockburst is. The slip-type rockburst was mainly affected by structural plane; it is due to the accumulation of elastic strain energy at the structural plane and the sudden release under the action of unloading or disturbance, driving the block on the structure surface fast slide, mainly manifested as the sliding of large blocks of surrounding rock, and forming a “V” shape pit blasting or cuneate blasting crater, as well as destruction with crackle. Compared with the strained rockburst, the damage is more serious. The research results can provide reference for rockburst prediction and prevention in similar deep rock engineering.

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Section: Introductionmentioning

confidence: 99%

Research on Temporal and Spatial Distribution Characteristics of Microseismic Events of Slip-Type Rockburst

Xu¹,

Song

Song³

et al. 2022

Shock and Vibration

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“…The spatial distribution of b-value before the five earthquakes in the eastern Tibetan Plateau reveals a consistent pattern (Figure 8): the epicenters of earthquakes tend to be situated in areas with lower b-value compared to the surrounding regions before the earthquakes. Given the inverse correlation between b-value and stress (Amitrano, 2003;Dong et al, 2022;Li et al, 2022;Mogi, 1967;Scholz, 1968, Scholz, 2015Schorlemmer et al, 2005;W. Goebel et al, 2013), this may indicate that there is a high stress accumulation near the epicenters before each of the five earthquakes.…”

Section: Discussionmentioning

confidence: 99%

“…The spatial distribution of b-value may reflect the background stress accumulation of different regions (Amitrano, 2003;Dong et al, 2022;Li et al, 2022;Mogi, 1967;Scholz, 1968, Scholz, 2015Schorlemmer et al, 2005;W. Goebel et al, 2013), while the spatial distribution of maximum shear strain rate derived from GPS observations may indicate the present-day stress accumulation rates (assuming the crust material is elastic, the stress rates and strain rates have a linear relationship).…”

Section: Seismic Hazards Combined Maximum Shear Strain Rate With B-va...mentioning

confidence: 99%

A test on methods for Mc estimation and spatial-temporal distribution of b-value in the eastern Tibetan Plateau

Gong,

Chen,

Gao

et al. 2024

Front. Earth Sci.

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Seismic b-value is one of the most important parameters for seismological research and seismic hazards assessment, while the accuracy of the b-value largely depended on the completeness of seismic catalog. This article compares eight methods for estimating the minimum magnitude of completeness (Mc). The results indicate that the modified maximum curvature method (MMAXC), exhibits greater stability and accuracy, closely approximating the standard Mc obtained from the synthetic seismic catalogs. We then calculate the b-value using the instrumental seismic catalog from 2000–2023 in the eastern Tibetan Plateau. The results indicate that the five major earthquakes occur in regions with lower b-value. In addition, the temporal evolution of b-value before and after major earthquakes exhibits a common trend of decreasing before earthquakes, and increasing after earthquakes, which may reflect the stress accumulation and release during earthquakes. Combining the results of maximum shear strain rate and b-value, we identify five regions characterized by low b-value and high shear strain rate, indicating a higher potential seismic hazard in the future.

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“…Soils with low to moderate compressibility are widely distributed in China, and most of high-speed railway foundations are constructed on these soils. However, the reinforcement technology of medium and low compressibility soil foundation is not mature at present [25][26][27][28][29], and bearing characteristics of a short pile-net composite foundation over soil with low to moderate compressibility continues to be an open problem. erefore, a field test is conducted in the Gan-Long (Ganzhou-Longyan) test section to investigate the bearing characteristics of a moderately compacted short pile-net composite foundation, which is more accurate when compared with laboratory test and numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Load Transfer Law of Short Pile-Net Composite Foundation for High-Speed Railway

Li¹,

Ye²,

Jiang³

et al. 2022

Shock and Vibration

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Although pile-net composite foundation has been widely used in the construction of high-speed railway, load transfer characteristics of its structural system during the filling of roadbed are seldom studied, so field studies are conducted in the Gan-Long (Ganzhou-Longyan) high-speed railway DK86 + 998.0–DK87 + 191.2 test section, aiming to explore the bearing characteristics of a short pile-net composite foundation over low to medium compressible soil. The study encompasses a field measurement of Earth pressure and pore water pressure which lasted almost two years, and a systematic analysis of variation law of soil pressure between piles and their tops and that of pore pressure in reinforcement zone and retaining layer in medium and low compressibility soil area. The results suggest that the soil in the test section bears the characteristic of a low water content, low porosity ratio, and high liquid limit, with compression factor being approximately 0.25, and test values of the natural soil pressure and the lateral distribution are close to the theoretical values. Soil pressure at the top of the piles is higher than that between the piles by approximately 2.4 times because of the differences in pile-net rigidity. Besides, the soil pressure of the pile-net composite foundation follows the pattern of “jagged” in the transverse direction of the roadbed. The filling load of the composite foundation soil arch is 80 kPa and the composite foundation reaction coefficient is 6.4 kN/m3 when the filling is stable. The pile-soil stress ratio at the shoulder and the center of the line is 3.2 and 2.8, respectively. The change of the hole pressure at the pile end point is larger than that at the reinforcement area, and the side verification short pile can effectively transmit the additional stress of the upper part to the pile end soil layer.

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Characteristics of microseismic b-value associated with rock mass large deformation in underground powerhouse caverns at different stress levels

Cited by 28 publications

References 44 publications

Research on Temporal and Spatial Distribution Characteristics of Microseismic Events of Slip-Type Rockburst

Research on Temporal and Spatial Distribution Characteristics of Microseismic Events of Slip-Type Rockburst

A test on methods for Mc estimation and spatial-temporal distribution of b-value in the eastern Tibetan Plateau

Analysis of Load Transfer Law of Short Pile-Net Composite Foundation for High-Speed Railway

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