A New Method to Investigate the Size Effect and Anisotropy of Mechanical Properties of Columnar Jointed Rock Mass

Zhao, Ding Guo; Wang, Yongyi; Zhang, Chuanqing; Liu, Ning; Tang, Chun’an; Singh, Hemant Kumar; Wang, Peng

doi:10.1007/s00603-022-03200-3

Cited by 21 publications

(10 citation statements)

References 57 publications

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“…If additional parameters unrelated to the stratified rock structure are not considered, these are failure along bedding planes and failure along planes where critical rock strength is achieved. The authors in [17] argue that at horizontal occurrence of rocks, the failure mode is similar to that of "rock beam" and, at large rock layer inclination angles there is a sliding on the contacts of rock layers. However, it should be noted that the research does not take into account the rock mass gravity.…”

Section: Introductionmentioning

confidence: 99%

Assessing stability of mine workings driven in stratified rock mass

Imashev,

Suimbayeva,

Zhunusbekova

et al. 2024

Min. miner. depos.

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Purpose.The research purpose is to assess the stability of mine workings driven in a stratified rock mass by studying the influence of the stratified rock bedding angle on the rock mass stress-strain state (SSS). Methods. The research uses both experimental and numerical methods. Experimental studies are carried out using rock samples with different angles of rock layer occurrence, while numerical modeling is performed using the RS2 (Geotechnical Finite Element Analysis) software based on the generalized Hoek-Brown failure criterion. The studies are carried out on models covering the border area of the mine workings driven in the mass with the angles of rock occurrence from 0 to 75°. Findings. Experimental and numerical studies have shown that when the rock layer inclination angle changes, significant changes occur in the stress concentration zones around the mine workings. An increased rock layer inclination angle is accompanied by a change in stress distribution, which is important for assessing the stability of mine workings. A particularly strong influence is observed at the angles of rock occurrence 30° and above. Originality. The research novelty is in revealing the patterns in the stress distribution in the stratified rock masses depen-ding on the rock layer inclination angle. Research results provide new data on the rock interaction mechanisms in difficult geological conditions. Practical implications. The results obtained can be used in the planning and operation of mine workings in difficult geological conditions. By taking into account the changes in stress zones caused by the rock layer inclination angle, it is possible to improve the safety and efficiency of mining operations.

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Section: Introductionmentioning

confidence: 99%

Assessing stability of mine workings driven in stratified rock mass

Imashev,

Suimbayeva,

Zhunusbekova

et al. 2024

Min. miner. depos.

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“…As one of the five kinds of natural disaster in coal mines, coal and gas outburst invariably endangers safe production. With the increasing depth and intensity of coal mining, the risk of coal seam outburst also gradually increases (Aguado and Nicieza, 2007;Vlastimil and Milan, 2010;Zhao et al, 2023). Therefore, the prediction of outburst disaster risk has become increasingly important, and the means to accurately predict outburst disasters have been widely concerned by scholars in this field (Koziel and Janus, 2022;Mlynarczuk and Skiba, 2022;Li et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Response law and indicator selection of seismic wave velocity for coal seam outburst risk

Qiu,

Zhu,

Liu

et al. 2023

Adv. Geo-Energy Res.

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The accurate detection of coal seam stress field effectively prevents coal and gas outbursts. This study uses wave velocity, wave velocity anomaly coefficient, and wave velocity gradient as indicators to identify stress anomalies in coal seam. The results show that these three indicators of wave velocity are all positively correlated with load, while changes in the wave velocity anomaly coefficient and wave velocity gradient are more gentle than those of wave velocity. The degree of damage of coal can be judged by the wave velocity anomaly coefficient, while the transition between high and low stress zones can be identified by the wave velocity gradient. In areas affected by geological structures such as valleys and mountain tops, the coal seam wave velocity and wave velocity anomaly coefficient may exhibit anomalies. The comparative analysis of wave velocity and its derived indicators can reveal the stress state and coal structure of coal seamwith higher accuracy, identify the areas affected by geological structures such as valleys and mountain tops, and determine the boundary of the stress relief zone after hydraulic fracturing. Combined with the actual geological structure characteristics of coal seam, it can accurately identify the stress disturbance region of coal seam and achieve the purpose of predicting coal and gas outbursts.

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“…Li et al [14] used granite to make separate SHPB experimental members and carried out stress wave propagation tests on joints containing fillings without considering confining pressure. Zhao et al [15] conducted ultrasonic wave velocity tests on continuous joints, showing a positive correlation between the wave velocity in the joints and the connection rate of the joints. Liu et al [16] studied the propagation attenuation law of shear wave propagation caused by the magnitude of normal stress on joint surfaces through numerical simulation and field tests.…”

Section: Introductionmentioning

confidence: 99%

Study on Stress Evolution and Crushing Behavior of Jointed Rock Mass under Confining Pressure and Joint Materials

Wang

Qihu

Fuli³

et al. 2023

Geofluids

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To study the effects of confining pressure and joint material properties on stress evolution and fracture behavior of jointed rock mass under SHPB impact load, the numerical software LS-DYNA and the indoor SHPB impact system are used to carry out experimental research on intact rock mass and jointed rock mass. The peak stress, reflection and transmission coefficient, and specimen failure state of rock specimens under different schemes are obtained. The effects of confining pressure level and joint material properties on the propagation and attenuation law of explosive stress waves are expounded. The test results show that when the confining pressure is within a specific range, the impact resistance of the limestone specimen can be increased, and the more difficult it is to be destroyed. Moreover, if the confining pressure continues to increase after rising to the peak value, the impact resistance of rock specimens will decline. In that case, the impact resistance of the specimen will decrease—the dynamic strength of jointed rock mass changes with a change in joint material. The dynamic strength of cement jointed rock is the highest, that of gypsum jointed rock is the second, and that of epoxy resin jointed rock is the lowest. The impact damage resistance of the jointed rock has the same law as the above.

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A New Method to Investigate the Size Effect and Anisotropy of Mechanical Properties of Columnar Jointed Rock Mass

Cited by 21 publications

References 57 publications

Assessing stability of mine workings driven in stratified rock mass

Assessing stability of mine workings driven in stratified rock mass

Response law and indicator selection of seismic wave velocity for coal seam outburst risk

Study on Stress Evolution and Crushing Behavior of Jointed Rock Mass under Confining Pressure and Joint Materials

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