Model test to investigate waterproof-resistant slab minimum safety thickness for water inrush geohazards

Jiang, Haiming; Li, Lang; Rong, Xiaoli; Wang, Mingyang; Xia, Yuanpu; Zhang, Zhicheng

doi:10.1016/j.tust.2016.11.004

Cited by 78 publications

(21 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zhang, Jiang, et al (2014) simulated the entire process of crack formation, the propagation of buried faults, and the evolution of water inrush channel under high-pressure water in a coal mine floor, and revealed the lagging water inrush mechanism of the coal floor in a confined water body. Jiang et al (2017) developed a model test system to simulate water inrush and studied the effect of the strata pressure, hydraulic pressure and waterproof-resistant slab thickness of the surrounding rock on water inrush. Liang et al (2016) analyzed the change laws of stress, displacement and water pressure based on the physical simulation experiment of water inrush in tunnel excavation.…”

Section: Introductionmentioning

confidence: 99%

The variable-mass seepage law of broken porous rock: an experimental study

Wang

Fan

et al. 2020

Geomatics, Natural Hazards and Risk

View full text Add to dashboard Cite

Induced by tunnel excavation, the particles constantly shift in broken porous rock of faults until failure occurs, which provides channels for water inrush. Therefore, it is essential to investigate the particle migration of broken porous rock. Thus, a visual experimental system of particle migration was developed independently. Further study on the mass loss evolution of broken porous rock induced by seepage failure was performed using physical model tests, and the effect of the grain gradation of broken porous rock was also analyzed. According to the composition and lost characteristics of the samples, the samples were divided into dense-suspension structure and void-skeleton structure. The results indicated that the mass loss of the particles decreased with the increase in the gradation coefficient when the sample had a dense-suspension structure, while there was no significant change in the lost quality with the increase of gradation coefficient when the sample had a void-skeleton structure. Moreover, the time required for water inrush decreased with the increase in the gradation coefficient, which is because the higher the content of the fine particles is, the lower the permeability of the sample. Sample settlement is positively correlated with the lost quality of particles.

show abstract

Section: Introductionmentioning

confidence: 99%

The variable-mass seepage law of broken porous rock: an experimental study

Wang

Fan

et al. 2020

Geomatics, Natural Hazards and Risk

View full text Add to dashboard Cite

show abstract

“…Calculated the safe thickness by the formula (1) with the parameter (A=1, λ=1.4, D=20, H=200), the calculated results is 1.86m. According to literature [7], the actual thickness of rock wall in Maluqing Tunnel is 1.5m. Combined with the foregoing research conclusions and results of this case, Safe thickness of rock wall by formula (1) is close to the reserved thickness in projects.…”

Section: Engineering Examplementioning

confidence: 99%

“…The minimal safe thickness of rock wall was provided based on the catastrophic characters of water inrush by Sun, et al [5].Guo established the formula to calculate the safe thickness of a rock wall based on critical water pressure [6]. Jiang et al investigated waterproof-resistant slab minimum safety thickness for water inrush geohazards according to the large-scale geomechanical model test [7].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation to determine the critical safe thickness of water-resisting rock wall based on FLAC3D

Chen¹,

Guo²

2017

Proceedings of the 2017 Global Conference on Mechanics and Civil Engineering (GCMCE 2017)

View full text Add to dashboard Cite

Caverns with high pressurized water ahead of tunnel face tend to cause water inrush. So, the determination of the critical safe thickness of the water-resisting rock wall to prevent water inrush geohazard is of great significance during karst tunnel construction. Firstly, to obtain the critical safety thickness of rock wall ahead of karst tunnel face, a numerical model based on FALAC3D and the method to determine the critical safe thickness are established. Then, a series of numerical tests planed by the orthogonal testing theory have been carried out. The rock mass level of rock wall, dip angle of strata, lateral pressure coefficient, cavity scale, water pressure and buried depth of tunnel on the critical safe thickness is studied. Finally, the regressive formula to determine the critical safe thickness of the water-resisting rock wall is established by means of numerical testing results. Taking for examples the Maluqing tunnel on Yiwan railway, the reliability and rationality of the proposed methods were proved, so providing reference for similar engineering projects.

show abstract

“…Zhang et al [19] proposed the key-hole grouting method and applied it to the treatment of high-pressure water inrush in fractured rock mass. Jiang et al and Liu et al [20,21] established a simplified model to simulate the whole process of water inrush and carried out a series of large-scale geomechanical model tests. The influence of formation pressure, water pressure, and thickness of waterproof board on water inrush is studied.…”

Section: Introductionmentioning

confidence: 99%

Groundwater Inrush Control and Parameters Optimization of Curtain Grouting Reinforcement for the Jingzhai Tunnel

Gan

Zhou³

et al. 2021

Geofluids

View full text Add to dashboard Cite

Based on the systematic study on the characteristics of water and mud inrush during the excavation of Jingzhai tunnel, the mechanism of water inrush seepage transformation caused by excavation disturbance is analyzed. By means of electromagnetic geophysical prospecting, the potential water bearing area of the tunnel was analyzed. The constitutive model of rock mass and grouting parameters are considered in the numerical simulation. The law of tunnel crack initiation and expansion under different curtain grouting parameters is proposed. The characteristics of seepage water inrush caused by excavation are described. It is considered that there are three stages in the seepage characteristics of tunnel: incubation, sudden, and stable. Numerical simulation was used to analyze the crack propagation track and water inflow characteristics under the grouting thickness of 3 m, 5 m, and 7 m. When the curtain grouting thickness was 3 m, the fracture field penetrated the curtain grouting area. The dominant seepage channel is formed, which greatly increases the probability of water inrush. When the curtain thickness is 5~7 m, the expansion of the crack zone can be controlled basically, so that the fracture and water bearing rock layer cannot form a seepage channel. At last, the grouting scheme of 6 m thick grouting and 20 m advanced grouting was selected, and the water seepage was reduced by 83%.

show abstract

Model test to investigate waterproof-resistant slab minimum safety thickness for water inrush geohazards

Cited by 78 publications

References 13 publications

The variable-mass seepage law of broken porous rock: an experimental study

The variable-mass seepage law of broken porous rock: an experimental study

Numerical simulation to determine the critical safe thickness of water-resisting rock wall based on FLAC3D

Groundwater Inrush Control and Parameters Optimization of Curtain Grouting Reinforcement for the Jingzhai Tunnel

Contact Info

Product

Resources

About