High internal pressure induced fracture patterns in rock masses surrounding caverns: Experimental study using physical model tests

Jongpradist, Pornkasem; Tunsakul, Jukkrawut; Kongkitkul, Warat; Fadsiri, Nattapol; Arangelovski, Goran; Youwai, Sompote

doi:10.1016/j.enggeo.2015.08.024

Cited by 53 publications

(13 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…ese geological disasters are the macromechanical manifestations of rock instability and failure. As a natural material, the rock contains various defects (e.g., microcracks, pores, joints, and fissures), and the instability and failure of an engineered rock mass are essentially a progressive process from the development of damage of mesoscopic defects to the macroscopic fracture of rock under a stress field [4][5][6]. erefore, it is of great theoretical significance and engineering value to study the fracture mechanism and crack propagation trends of rock under loading to thoroughly understand the failure mechanism of the engineering rock mass as well as to evaluate and predict geological disasters.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Fracture Patterns and Crack Propagation of Sandstone Based on Acoustic Emission

Wang

Chang

Liu

2021

Advances in Civil Engineering

View full text Add to dashboard Cite

To investigate the fracture pattern and crack propagation of rock under different stresses, Brazilian split tests, preset angle tests, and uniaxial compression acoustic emission (AE) tests were carried out on sandstone to obtain the mechanical parameters and AE signals of the whole test process. Based on the analysis of the distribution of the characteristic AE indicators rise time/amplitude (RA) and average frequency (AF) combined with the core definition of areal density, the test results showed the following. In Brazilian split tests and preset angle tests, shear fractures and tensile fractures accompanied the whole process of rock damage and failure, and the crack type reflected by the RA-AF distribution was consistent with the theoretical analysis and actual failure results. The fracture pattern of sandstone under uniaxial compression was dominated by shear fracture, and tensile and shear cracks had the same evolutionary trend. In uniaxial compression, the development of cracks was complicated from the stage of steady development of microcracks, and the crack development was different in different specimens, which eventually leads to different failure modes. That is, the failure mode of sandstone could provide positive feedback to the RA-AF distribution. Under different stresses, the characteristics of the cumulative event rate of tensile or shear fractures varied significantly among stages, which corresponded to the various stages of rock damage and deformation.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Study on Fracture Patterns and Crack Propagation of Sandstone Based on Acoustic Emission

Wang

Chang

Liu

2021

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…Yan Chunhe et al [21][22][23] numerically simulated the time-yield deformation law and the extent of the time-yield damage zone at the top of the cavity in the surrounding rock and rock pillars of salt cavern gas storage reservoirs through the secondary development of ABAQUS. Pornkasem et al [24] investigated the damage behavior of cavern envelopes under high internal pressure, as well as the mechanism of crack generation and development in the rock mass, by using a physical model test method on synthetic rock samples containing cavities. Xia Caichu et al [25][26][27] addressed the stability of surrounding rocks in piezo gas storage in underground chambers operating under high internal pressure; the plastic zone and perimeter strain of the surrounding rocks in piezo gas storage chambers of different structural types and under high internal pressure was obtained through finite element calculations.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on Deformation Characteristics of Surrounding Rock during Construction and Operation of Large Underground Gas Storage Structures

Zhenhua¹,

Ding

Jiang

et al. 2022

Sustainability

View full text Add to dashboard Cite

Underground gas storage is an important technical measure for future natural gas storage. The stability of the surrounding rock during excavation and under ultra-high gas storage pressure is the key to the stable operation of gas storage reservoirs. A numerical calculation model for different surrounding rock conditions, different depth-span ratios, and different buried depth conditions was conducted to study the stability of surrounding rock after large section underground gas storage excavation and under an ultra-high gas storage pressure of 20 MPa. The results show that after construction is completed, the deformation of the rock surrounding the cavern increases with a decrease in the surrounding rock grade, and the deformation of the rock surrounding the cavern increases as the burial depth increases. In addition, the maximum vertical deformation of the surrounding rock decreases with the increase in the depth-span ratio of the cavern, and the maximum horizontal displacement increases with the increase in the depth-to-span ratio. While operating at 20 MPa gas storage pressure, the displacement of the rock surrounding the chamber tends to increase with the decrease in the surrounding rock grade and the deformation of the surrounding rock of the chamber decreases as the burial depth increases. Furthermore, the vertical displacement of the rock surrounding the chamber decreases with the increase in the depth-span ratio, while the horizontal displacement of the surrounding rock increases with the increase in the depth-span ratio. Considering the stability of the surrounding rock during construction and operation, gas storage chambers should be built in areas with better conditions, such as Grade II and Grade III surrounding rocks within a burial depth range of 200 m. Moreover, the stability of the surrounding rocks is better when the chamber depth-span ratio is 2.5~3.0. These research results can provide a theoretical reference for the design of large underground gas storage structures.

show abstract

“…In these models, they do not consider the initial stress state of the surrounding ground before excavation and operation, which can lead to unrealistic evaluation. In the last decade, many researchers have performed analyses to suggest a reasonable uplift failure pattern [7][8][9][10][11][12]. According to their study, the initial failure point along the cavern periphery depends on the in-situ stress ratio that can lead to different uplift failure patterns [2,9].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Failure Initiation and Modes of Failure of the Hoek-Brown Rock Mass Surrounding Underground Storage With High Internal Pressure

Thongraksa¹

2022

GEOMATE

View full text Add to dashboard Cite

The critical issue for the design of highly pressurized caverns is the uplift failure. A reasonable evaluation of the failure path including the initial failure location and direction of the crack propagation is needed. A series of numerical analyses based on the finite element method was conducted in the framework of the 2D axisymmetric model by considering the variety of rock mass properties, cavern depth, and in-situ stress ratio. The wide range of the natural rock mass properties (rock strength) and initial stress conditions surrounding the cavern, which include in-situ stress ratio and depth of tunnel were considered in this investigation. To detect the location of failure initiation and distinguish the failure modes between tensile and shear failure, the tensile failure and Hoek-Brown failure criteria are utilized, respectively. The numerical results indicated that the rock strength has a strong effect on the initial failure mode while the initial failure location strongly depends on the in-situ stress ratio and rock strength. The charts of failure mode and initial failure location were created by using the relationship between unconfined compressive strength and tensile strength of rock mass and initial stress condition, respectively

show abstract

High internal pressure induced fracture patterns in rock masses surrounding caverns: Experimental study using physical model tests

Cited by 53 publications

References 18 publications

Experimental Study on Fracture Patterns and Crack Propagation of Sandstone Based on Acoustic Emission

Experimental Study on Fracture Patterns and Crack Propagation of Sandstone Based on Acoustic Emission

Numerical Simulation Study on Deformation Characteristics of Surrounding Rock during Construction and Operation of Large Underground Gas Storage Structures

Evaluation of the Failure Initiation and Modes of Failure of the Hoek-Brown Rock Mass Surrounding Underground Storage With High Internal Pressure

Contact Info

Product

Resources

About