R/S Analysis and its Application in the Forecast of Mine Inflows

Yang, Yongguo; Yuan, Jiayi; Chen, Suozhong

doi:10.1016/s1006-1266(07)60040-6

Cited by 32 publications

(27 citation statements)

References 1 publication

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“…Guan DC 29 and Wu X 30 first introduced the method of using caustics to study static fracture in China. Yang LY and Yang RS 31 developed a new digital laser dynamic caustic experiment system by combining high-speed photography system and laser system.On this basis, the caustics method is widely used in the dynamic fracture process of rocks [32][33] .…”

Section: Principle Of Caustics Test Methodsmentioning

confidence: 99%

Study on Compound Mode Crack Propagation Law of Semi Circular Arch Roadway Under Impact Load

Li¹,

Renshu²,

An³

2021

Preprint

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Various kinds of defects are usually contained in the underground roadway. When the roadway is impacted by external load, the location of defects will influence the roadway with different degrees. In order to study the effect of the location of defects on crack propagation in roadway, in this paper, the stress wave produced by the bullet impacting the incident rod was used as the impact load. Meanwhile, the variations of speed, displacement and dynamic stress intensity factor (DSIF) of cracks, during crack propagation, were obtained by using the experimental system of digital laser dynamic caustics (DLDC). And the extended finite element software ABAQUS is used for numerical simulation. Based on the method of experimental-numerical simulation, the crack propagation path is verified and the impact fracture behavior of semi-circular arch roadway with different defect positions is presented. It can be concluded that when the prefabricated crack is located at the central axis of sample, the crack propagation belongs to pure mode I; when the prefabricated crack is 5mm away from the central axis, the crack propagation appears between mode I and I-II mixed mode alternately; when the prefabricated crack is at the edge of semi-circular arch roadway, the crack propagation follows I-II mixed mode

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Section: Principle Of Caustics Test Methodsmentioning

confidence: 99%

Study on Compound Mode Crack Propagation Law of Semi Circular Arch Roadway Under Impact Load

Li¹,

Renshu²,

An³

2021

Preprint

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“…In the beginning, its applications were limited to realm in hydrology. But subsequently the applications were spread to diverse disciplines and problems including economics time series [7,8], geology [9], and hydrology [10], as well as other fields. For estimating the Hurst exponent, Mandelbrot and Wallis further developed the rescaled range statistic and introduced a graphical techniquel l l].…”

Section: Sen)mentioning

confidence: 99%

The long-term correlation of conditional time series of traffic time series

Zhang

Liu

Dong

2009

2009 International Conference on Future BioMedical Information Engineering (FBIE)

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“…In addition, the geological structure of the coal seam is one of the main factors causing dust generation . Field investigation and observation show that the more complex the geological structure, the higher the dust concentration in the process of coal mining . According to the above research, all of the coal seams that have experienced coal and gas outbursts contain tectonic coal.…”

Section: Introductionmentioning

confidence: 96%

Experimental Study on the Wettability of Tectonic Soft Coal in Huaibei Mining Area, China

et al. 2021

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This study investigated the wettability of tectonic soft coal by analyzing the relationship between proximate analysis indexes, oxygencontaining functional groups, pore characteristics, hardness, gas adsorption capacity, and contact angles. Results show that coal was more hydrophilic with the increase of gas adsorption capacity, moisture content, ash content, and the content of Si−O−Si functional groups and was more hydrophobic with the increase of the fixed carbon content and coal hardness, while the correlation between volatile matter and wettability was not obvious. The isothermal adsorption/desorption curves of coal obtained from a lowtemperature nitrogen adsorption experiment show that the greater the number of open pores and the better the connectivity of pores, the better the coal wettability. The pore fractal characteristic was analyzed with respect to two aspects: the coal surface roughness represented by the surface fractal dimension D 1 and the pore irregularity and complexity represented by the structure fractal dimension D 2 . The relationships between D 1 , D 2 , and the contact angle show that with the increase of D 1 and D 2 , the coal wettability becomes better, which indicates that the rougher the coal surface and the more complex the pore structure, the better the coal wettability.

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R/S Analysis and its Application in the Forecast of Mine Inflows

Cited by 32 publications

References 1 publication

Study on Compound Mode Crack Propagation Law of Semi Circular Arch Roadway Under Impact Load

Study on Compound Mode Crack Propagation Law of Semi Circular Arch Roadway Under Impact Load

The long-term correlation of conditional time series of traffic time series

Experimental Study on the Wettability of Tectonic Soft Coal in Huaibei Mining Area, China

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