Investigating Water Permeation through the Soil-Rock Mixture in Underground Engineering

Wang, Yingchao; Meng, Fan-Rong; Geng, Fan; Jing, Hongwen; Zhao, Ning

doi:10.15244/pjoes/69144

Cited by 6 publications

(6 citation statements)

References 29 publications

(33 reference statements)

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“…Under high geo-stress, high groundwater pressure is prone to cause engineering geological disasters, such as water inrush. It seriously affects the construction progress and personnel safety for underground rock engineering [3]. The excavation of underground engineering, in fact, is the triaxial loading and unloading processes of the surrounding rock masses.…”

Section: Introductionmentioning

confidence: 99%

Triaxial Loading and Unloading Tests on Dry and Saturated Sandstone Specimens

Sun

Zhu

et al. 2019

Applied Sciences

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The brittle failure of hard rock due to the excavation unloading in deep rock engineering often causes serious problems in mining and tunneling engineering, and the failure process is always affected by groundwater. In order to investigate the effects of stress paths and water conditions on the mechanical properties and failure behavior of rocks, a series of triaxial compression tests were conducted on dry and saturated sandstones under various loading and unloading paths. It was found that when the sandstone rock samples are saturated by water, the cohesion, the internal friction angle and the Young’s modulus will decrease but the Poisson′s ratio will increase. The fracturing characteristics of the sandstone specimens are related to the initial confining pressure, the stress paths and the water conditions from both macroscopic and microscopic viewpoints. The failure of sandstone in unloading test is more severe than that under loading test, particularly for dry sandstone samples. In unloading test, the energy is mainly consumed for the circumferential deformation and converted into kinetic energy for the rock bursts. The sandstone is more prone to produce internal cracks under the effect of water, and the absorbed energy mainly contributes to the damage of rock. It indicates that the possibility of rockburst in saturated rock is lower than the samples in dry condition. It is important to mention that water injection in rock is an effective way to prevent rockburst in deep rock engineering.

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Section: Introductionmentioning

confidence: 99%

Triaxial Loading and Unloading Tests on Dry and Saturated Sandstone Specimens

Sun

Zhu

et al. 2019

Applied Sciences

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“…In this paper, a numerical simulation is used to study the migration of water in three different structural pores of the fractured rock mass, and the seepage-flow transformation mechanism of the fillings in the pore of the fractured rock mass is revealed. e simulation model of the soil-rock mixture is based on previous studies [4,39,40], as shown in Figure 1. e filling structure can be regarded as consisting of the fixed particles phase (soil skeleton), the movable particles phase, and the water phase.…”

Section: Fluid-solid Coupling Model Of Granularmentioning

confidence: 99%

“…To quantitatively understand the impact of various influencing factors on the infiltration instability of filling media, a two-dimensional finite element model was established by using the Fluent software [40]. Each of the three structural models is 1 m long and 0.5 m wide.…”

Section: Establishment and Solution Of Numerical Analysis Modelmentioning

confidence: 99%

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Numerical Simulation on the Seepage Properties of Soil‐Rock Mixture

Zhao

Wang

Meng

et al. 2018

Advances in Materials Science and Engineering

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To reveal the mechanism of water inrush in a fault tunnel and study the influence of different structures on the seepage process, a filling structure composed of a soil skeleton (fixed particles), a movable particles phase, and a water phase is constructed to simulate the rock mass broken by the fault. Fluent software is used to simulate the migration of the water phase in three different filling structures under different initial water velocities and dynamic viscosities. The variation law of the seepage time with the initial water velocity and dynamic viscosity in the three types of filling structures is obtained. The research shows the following: (1) the looser the filling structure, the greater the influence of gravity on the water phase seepage; the more compact the filling structure, the greater the spread range of the water phase and the more uniform the spread of the water phase. (2) The seepage time decreases with the increase in the initial water velocity. The seepage time and initial water velocity can be fitted by an exponential function. The effect of initial water velocity on seepage time is much greater than that of the structure. (3) The seepage time is related to both the dynamic viscosity and the structure. The seepage time increases with the increase in dynamic viscosity.

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“…A great amount of research has been devoted to the catastrophic evolution process of water inrush [2][3][4] and the risk assessment of water inrush, while the main focus has been on the risk of floor water inrush in coal mines [5][6]. Many new methods have been put forward to predict water inrush, such as the support vector machine [7], BP neural network and DS theory [8], geographic information system [9], a secondary fuzzy comprehensive evaluation system [10], and four-zone theory [11], as well as fault tree analysis [12].…”

Section: Introductionmentioning

confidence: 99%

Risk Assessment of Water Inrush in Karst Tunnels Based on the Ideal Point Method

Wang¹,

Olgun²,

Wang³

et al. 2018

Pol. J. Environ. Stud.

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Water inrush is one of the typical geological hazards in the construction of high-risk tunnels, and has caused severe losses. To predict water inrush accurately, a novel model was put forward for karst tunnels in the present study. The ideal point method coupled with the analytic hierarchy process method (AHP) was applied for risk assessment of water inrush. First, the ideal point method was introduced as a brand-new way to predict the risk level of water inrush. Second, the water inrush risk in karst tunnels was discussed in terms of influencing factors. With the consideration of karst hydrological and engineering geological conditions, seven key factors were selected as evaluation indices, including formation lithology, unfavorable geological conditions, groundwater level, landform and physiognomy, modified strata inclination, contact zones of dissolvable and insoluble rock, and layer and interlayer fissures. Then the ideal point method was used to deal with the multiple evaluation indices to determine the ideal point and the anti-ideal point. Meanwhile, the analytic hierarchy process method (AHP) was applied to determine the weight coefficient of each evaluation index. Thus, the minkowski distances respectively for the ideal point and the anti-ideal point were calculated. Based on the discriminant analysis theory, the closeness degrees to the ideal points were brought out to specify the risk level of water inrush. Finally, the proposed model was applied to a typical deep-buried karst tunnel: Jigongling Tunnel in China. The obtained results were compared with the results of the relevant methods and the practical findings, and reasonable agreements could validate the presented approach. The obtained results not only provide guidance for the construction of high-risk tunnels, but also bring out an alternative way for risk assessment of water inrush.

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Investigating Water Permeation through the Soil-Rock Mixture in Underground Engineering

Cited by 6 publications

References 29 publications

Triaxial Loading and Unloading Tests on Dry and Saturated Sandstone Specimens

Triaxial Loading and Unloading Tests on Dry and Saturated Sandstone Specimens

Numerical Simulation on the Seepage Properties of Soil‐Rock Mixture

Risk Assessment of Water Inrush in Karst Tunnels Based on the Ideal Point Method

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