Near-surface stress measurements in the Longmenshan fault belt after the 2008 Wenchuan Ms8.0 earthquake

Feng, Chengjun; Zhang, Peng; Qin, Xianghui; Ma, Wen; Tan, Chengxuan; Chen, Qunce

doi:10.1016/j.ijrmms.2015.03.017

Cited by 13 publications

(2 citation statements)

References 11 publications

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“…It is a common understanding that the stress field variation may induce fault slips (Pereira et al 2014;Sainoki andMitri 2014, 2015a;Feng et al 2015;Ma et al 2019;Li et al 2021;Taghipour et al 2021). However, to obtain the accurate distribution and evolution of a stress field is a challenge due to the heterogeneity of rock mass and the limitation of stress measurement methods (Hubbert and Willis 1957;Brown and Hoek 1978;Zoback et al 2003).…”

Section: Stress and Displacement Fieldmentioning

confidence: 99%

An experimental study of fault slips under unloading condition in coal mines

Zhang

Shan

et al. 2023

Bull Eng Geol Environ

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To investigate the mechanism of fault slips in coal mines, a biaxial shear experiment was carried out under unloading condition based on the fault F16 in Yima city, China. Two rock samples were used in the experiment and each sample was composed of two triangular sandstone blocks which were put together to simulate the fault. One rock sample was used to do fault slip tests and it was called slip-test sample. The other sample for comparison with the slip-test one was untested, and it was named non-slip-test sample. During the biaxial shear experiment of the slip-test sample, normal and shear strains near the fault, acoustic emission (AE) signals, and the sliding displacement were measured. After the experiment, microscopic profiles of fault surfaces of both rock samples were examined by scanning electron microscope (SEM). In addition, a numerical simulation was conducted to model the slip of the fault F16. The results indicate that: (1) three fault slips occurred during the biaxial shear experiment, and the shear stress, normal and shear strains in the first slip showed the maximum variation among three slips; (2) Shear strains near the two ends of the fault had a more significate variation than that in the middle part, and the typical trend of shear strains was first dropping, then increasing rapidly, and then falling slowly to a specific value during the first slip; (3) The first slip had the largest sliding displacement of 29.89 $$\mu m$$ μ m , and in the first slip three phases including slow slip, main shock and aftershock occurred based on AE monitoring results. (4) On the fault surface of non-slip-test sample, microstructures such as bulges, voids and veins were ubiquitous and notable, making the fault surface much rough, while similar microstructures were few and the fault surface of the slip-test sample was flattened after fault slips; (5) The slipping direction in the shallow part and deep part of the fault F16 were opposite during mining.

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Section: Stress and Displacement Fieldmentioning

confidence: 99%

An experimental study of fault slips under unloading condition in coal mines

Zhang

Shan

et al. 2023

Bull Eng Geol Environ

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“…Over the last few decades, a large number of studies on determining in situ stresses have been conducted. Various techniques [1][2][3][4][5] for stress determination have been proposed, and many measuring sensors [6][7][8][9] have been developed. The sensors can be divided into three groups: stiff or solid cells [10], borehole deformation gauges [7], and soft inclusion cells [6].…”

Section: Introductionmentioning

confidence: 99%

A Fiber Bragg Grating Borehole Deformation Sensor for Stress Measurement in Coal Mine Rock

Zhao

Zhong

Chen

2020

Sensors

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A borehole deformation sensor for long-term stress monitoring in coal mine rock based on optical fiber Bragg gratings (FBGs) is presented. The sensor converts borehole deformation into optical fiber strain by using four rings. For each ring, two FBGs are bonded with the ring to measure the borehole deformation, and a reference FBG free from mechanical load is introduced to remove the temperature effect. Two simple checks on the test data can be performed to improve the test accuracy. Laboratory and field tests were conducted to validate the accuracy and long-term performance of the sensor. The results show that the sensor is capable of measuring stress in rock with good accuracy, and it performs well over a long period of time in coal mines. The developed sensor provides an approach for the long-term monitoring of stress changes in coal mine rock.

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Contemporary stress field in and around a gold mine area adjacent to the Bohai Sea, China, and its seismological implications

Guo

Cai

2022

Bull Eng Geol Environ

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Near-surface stress measurements in the Longmenshan fault belt after the 2008 Wenchuan Ms8.0 earthquake

Cited by 13 publications

References 11 publications

An experimental study of fault slips under unloading condition in coal mines

An experimental study of fault slips under unloading condition in coal mines

A Fiber Bragg Grating Borehole Deformation Sensor for Stress Measurement in Coal Mine Rock

Contemporary stress field in and around a gold mine area adjacent to the Bohai Sea, China, and its seismological implications

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