Zobrazeno 1 - 10
of 98
pro vyhledávání: '"Yuantian Sun"'
Publikováno v:
Meitan kexue jishu, Vol 52, Iss 10, Pp 33-53 (2024)
Rock damage and rupture is a multi-scale chain damage rupture process from microscopic to mesoscopic to macroscopic. It is essential to clarify the damage characteristics of rock at different scales and establish the quantitative relationships of mul
Externí odkaz:
https://doaj.org/article/66a37a34b8c34684b790db1f3d117c56
Publikováno v:
Applied Sciences, Vol 14, Iss 22, p 10178 (2024)
This paper studies the effectiveness of the stress-relief groove on the floor of deep coal roadway and determines the influence of the stress-relief groove parameters on the surrounding rock through qualitative analysis. Based on the displacement con
Externí odkaz:
https://doaj.org/article/a6740a5e8c00439689308882095f2644
Publikováno v:
International Journal of Mining Science and Technology, Vol 31, Iss 5, Pp 813-823 (2021)
Cement-based grouting has been widely used in mining engineering; its constitutive law has not been comprehensively studied. In this study, a novel constitutive law of cement-grouted coal specimens (CGCS) was developed using hybrid machine learning (
Externí odkaz:
https://doaj.org/article/def4955faf9c4afc8e01042727a2410c
Publikováno v:
International Journal of Mining Science and Technology, Vol 31, Iss 2, Pp 153-162 (2021)
In the loose and fractured coal seam with particularly low uniaxial compressive strength (UCS), driving a roadway is extremely difficult as roof falling and wall spalling occur frequently. To address this issue, the jet grouting (JG) technique (high-
Externí odkaz:
https://doaj.org/article/00cc093df09e4ce4b20138b0b80d5f8f
Publikováno v:
International Journal of Mining Science and Technology, Vol 30, Iss 6, Pp 769-776 (2020)
In coal mining industry, with the depth growing of coal mines, the creep behaviours of coal and rock can extensively affect the mining safety, coalbed methane recovery and geo-sequestration. To acquire a better insight into their creep characteristic
Externí odkaz:
https://doaj.org/article/7844b04e4bac49199cf1a9a070e05b40
Publikováno v:
Energy Science & Engineering, Vol 8, Iss 6, Pp 2151-2158 (2020)
Abstract The efficiency of coal mining is seriously affected by roadway stability, as large time‐dependent deformation of roadway frequently occurs and needs to be maintained several times during its service life. Such rheological deformation was c
Externí odkaz:
https://doaj.org/article/df6d302c254c4a6dbc93283a91389c87
Publikováno v:
Energy Science & Engineering, Vol 8, Iss 2, Pp 490-500 (2020)
Abstract Roadway stability in extremely soft coal mass is a typical challenge in deep underground mines, as the most widely adopted support structure such as rock bolting, compound support system normally fails. This paper proposed a novel prereinfor
Externí odkaz:
https://doaj.org/article/e077e98056574f4f88ef0b8cfeca1fe0
Publikováno v:
Lithosphere, Vol 2021, Iss Special 4 (2021)
AbstractUsing hydraulic fracturing for cutting roof pressure is a critical technology to protect coal pillars. In this paper, based on the engineering background of 18506 working face in the Xiqu Coal Mine, using the methods of theoretical analysis,
Externí odkaz:
https://doaj.org/article/751b7ef639e04d20b33a9eaf021424d7
Publikováno v:
Geofluids, Vol 2021 (2021)
The micromechanism of the effects of different height/width ratios (H/W) and initial stress levels on unloading characteristics of deep rock was investigated based on PFC3D true-triaxial unloading simulation. The results show that the increase of H/W
Externí odkaz:
https://doaj.org/article/cd271ef24d4844dca7491c28f2d51a11
Publikováno v:
Advances in Civil Engineering, Vol 2021 (2021)
The roadway deformation normally relates to time especially for underground coal roadway. The strength of soft coal is low, and therefore the deformation increases gradually under constant stress with time, which is called rheology deformation. In th
Externí odkaz:
https://doaj.org/article/d751cc3684534d798f078265e52d5029