Coupled hydro-mechanical effect of a fractured rock mass under high water pressure

Jiang, Zhongming; Feng, Shi‐Jin; Fu, Sheng Jie

doi:10.3724/sp.j.1235.2012.00088

Cited by 10 publications

(5 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, concrete was considered as the sealing layer in this calculation. Assume that there were 3 fractures in the lining sealing layer, the location of fractures was random, and the fracture lengths were 50 m. Considering that there will still be a certain degree of contact surface between the concrete lining and the surrounding rock after the completion of construction [23], the contact surface between the concrete lining and the crack was set as a fracture attribute.…”

Section: Program Verificationmentioning

confidence: 99%

Seepage and Heat Transfer Characteristics of Gas Leakage under the Condition of CAES Air Reservoir Cracking

Jiang

2021

Geofluids

View full text Add to dashboard Cite

The contradiction between supply and demand of energy leads to more and more attention on the large-scale energy storage technology; Compressed Air Energy Storage (CAES) technology is a new energy storage technology that is widely concerned in the world. The research of coupled heat transfer and seepage in fractured surrounding rocks is the necessary basis to evaluate the operation safety and effectiveness of CAES. Current studies point to the possibility of cracking in concrete liner seals, but the thermodynamic processes and leakage characteristics of compressed air in the presence of cracking and the heat transfer characteristics of seepage have not been addressed and reported. In order to investigate the leakage, the gas seepage and heat transfer law in fractured rock when the hard rock CAES gas reservoir seal cracks, the COMSOL fracture Darcy module, and the non-Darcy Forchheimer model are used as the constitutive seepage. The global ODE is used to calculate the thermodynamic process of compressed air in gas storage with coupled seepage and heat transfer process. The pressure and temperature of compressed air are obtained as the unsteady boundary of the seepage heat transfer model. A program for calculating the seepage and heat transfer characteristics of fractured surrounding rock in the CAES gas reservoir is established. On this basis, with the proposed Suichang CAES cavern as the background, the seepage and heat transfer characteristics of the fractured surrounding rock of the gas storage are studied. The results showed that when there are fewer cracks in the lining and surrounding rock of the air reservoir, the air pressure decreases due to a small amount of air leakage after 30 operation cycles, and the leakage rate of each cycle is 0.7% of the gas storage capacity, but it still meets the engineering requirements. If the plant is operating under these conditions, the charging rate will need to be increased by 1.2 kg/s per cycle charging stage. In the discharging and power generation phase, the high-pressure air that previously percolated into the rock mass cracks could flow back into the air storage through the lining cracks. Therefore, it is incorrect and unreliable to consider the gas which flows out from the inner surface of the lining as unusable. When the lining crack width is less than 0.3 mm, the seepage flow is Darcy flow and the non-Darcy effect can be ignored; when the lining crack width is greater than 0.5 mm, the non-Darcy effect of seepage cannot be ignored. The gas velocity in the surrounding rock fracture medium is on the order of 0.01 m/s with an influence range of over 100 m, and the gas velocity in the pore medium is on the order of 10-6 m/s with an influence range of 50 m. The findings of this study contribute to a better understanding of the interaction between the thermodynamic properties of compressed air and the seepage heat transfer process in compressed air storage underground reservoirs, as well as the gas leakage process in the event of liner seal cracking.

show abstract

Section: Program Verificationmentioning

confidence: 99%

Seepage and Heat Transfer Characteristics of Gas Leakage under the Condition of CAES Air Reservoir Cracking

Jiang

2021

Geofluids

View full text Add to dashboard Cite

show abstract

“…Scholars at home and abroad search for an efficient method of mechanical cutting assisted by other means. In addition to traditional drilling and blasting, the current methods of coal breaking with assistance mainly include microwave irradiation assisted coal breaking (Hassani et al, 2016), high pressure water jet assisted coal breaking (Liu, 2022b), impact pick assisted coal breaking (Zhang et al, 2022a) and high-pressure water fracturing assisted coal breaking (Jiang et al, 2012;Li et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Analysis of dynamic characteristics of an experimental bench of high-pressure water fracturing assisted cutting

Liu¹,

Zhang²,

Sun³

et al. 2023

Journal of Theoretical and Applied Mechanics

View full text Add to dashboard Cite

Aiming at the problem that the cutting efficiency of a drum shearer is low when mining hard coal seams, an experimental bench of high-pressure water fracturing assisted cutting is designed. Compared with normal ones, the maximum equivalent stress of the improved experimental bench is reduced by 55.38%, and the maximum total deformation is reduced by 27.23%. According to the results of dynamic response analysis, it is concluded that the experimental bench of high-pressure water fracturing assisted cutting is stable and reliable under extreme working conditions, and meets design requirements for strength and stiffness.

show abstract

“…It can be seen that there is an obvious interaction between the rock mass and fissure water, that is, waterrock coupling. The water-rock under the coupling action of the rock mass deformation and failure regularity study involved resource mining, underground cavern excavation, nuclear waste storage, and a series of key areas; therefore, clear water-rock under the action of coupling of the degradation mechanism of the rock mass proposes that the corresponding constitutive model of rock under the action of water-rock is the key problem that needs to be urgently solved in the rock mechanics field (Rutqvist and Stephansson [1]; Rahman et al [2]; Li et al [3]; Wu [4]; and Chen and Li [5]).…”

Section: Introductionmentioning

confidence: 99%

The Damage Constitutive Model of Sandstone under Water-Rock Coupling

Jiang

Hou

et al. 2022

Geofluids

View full text Add to dashboard Cite

A constitutive model based on damage mechanics and statistical strength theory for sandstone under water-rock coupling is proposed and verified by laboratory tests and numerical tests. The damage mechanism of sandstone under the coupling action of water and force is clarified based on the microscopic test of sandstone under the coupling action of water and rock in this paper. The stress state of sandstone is determined by analyzing the results of laboratory tests. Based on the energy theory method, the strength criterion of sandstone under the interaction of water and rock is obtained, which is introduced into the statistical damage constitutive model of sandstone considering the interaction of water and rock; thus, a relatively perfect damage constitutive model of sandstone considering the interaction of water and rock is established. Finally, the influence of the number of cycles on the model parameters was further analyzed by analyzing the model parameters and the water-rock coupling test. Compared with the existing test results, the model established in this paper can perfectly reflect the deterioration characteristics of sandstone under the coupling action of water and rock.

show abstract

Coupled hydro-mechanical effect of a fractured rock mass under high water pressure

Cited by 10 publications

References 4 publications

Seepage and Heat Transfer Characteristics of Gas Leakage under the Condition of CAES Air Reservoir Cracking

Seepage and Heat Transfer Characteristics of Gas Leakage under the Condition of CAES Air Reservoir Cracking

Analysis of dynamic characteristics of an experimental bench of high-pressure water fracturing assisted cutting

The Damage Constitutive Model of Sandstone under Water-Rock Coupling

Contact Info

Product

Resources

About