Mechanical behavior of groundwater seepage in karst collapse pillars

Bai, Haibo; Ma, Dan; Chen, Zhanqing

doi:10.1016/j.enggeo.2013.07.003

Cited by 124 publications

(63 citation statements)

References 18 publications

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“…Although diverse in geometry, KCPs are usually presented similarly to a dome shape [9]. Each of these approximates a 3D axisymmetric model, which can be simplified as a 2D symmetrical model.…”

Section: Numerical Model Setupmentioning

confidence: 99%

“…For instance, based on the elastic thick plate theory, Tang et al [4] developed a mechanical model for water inrush of KCPs. Bai et al [9] established a mechanical model-plug model, which was used to describe the behavior of water seepage flow in coal-seam-floor containing KCPs. Furthermore, the variable mass dynamics and nonlinear dynamics were introduced, and the seepage properties of KCPs associated with particles migration were investigated using numerical simulation [3].…”

Section: Introductionmentioning

confidence: 99%

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Predicting Erosion-Induced Water Inrush of Karst Collapse Pillars Using Inverse Velocity Theory

et al. 2018

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Although the impact of Karst Collapse Pillars (KCPs) on water inrush has been widely recognized and studied, few have investigated the fluid-solid interaction, the particles migration inside KCPs, and the evolution feature of water inrush channels. Moreover, an effective approach to reliably predict the water inrush time has yet to be developed. In this work, a suite of fully coupled governing equations considering the processes of water flow, fracture erosion, and the change of rock permeability due to erosion were presented. The inverse velocity theory was then introduced to predict the water inrush time under different geological and flow conditions. The impact of four different controlling factors on the fracture geometry change, water flow, and inrush time was discussed in detail. The results showed that the inverse velocity theory was capable of predicting the occurrences of water inrush under different conditions, and the time of water inrush had a power relationship with the rock heterogeneity, water pressure, and initial particle concentration and an exponential relationship with the initial fracture apertures. The general approach developed in this work can be extended to other engineering applications such as the tunneling and tailing dam erosion.

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Section: Numerical Model Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Predicting Erosion-Induced Water Inrush of Karst Collapse Pillars Using Inverse Velocity Theory

et al. 2018

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“…inrush, water flows through pore structure of fracture zone or the small original cracks, and the flow rate is low. Then the flow rate rises up rapidly as a result of the washout of fine particulates and existing in-fill in the fracture zone, the porosity of the fault changes and connective cracks appear in the second stage (Barbara et al, 2011;Bai et al, 2013). With the expanding and connecting of cracks, water seepage will turn into a kind of analogous pipe flow and will result in a large scale water inrush (Fig.…”

Section: Analyses Of the Fault Water Inrush Accidentmentioning

confidence: 99%

Analytical and experimental study of water seepage propagation behavior in the fault

Huang¹

2014

Acta Geodynamica Et Geomaterialia

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Coal mine water inrush has an impartible relationship with the fracture zone such as faults, which deeply threaten the safety production in China. In order to study the water seepage behavior in the fault and the impermeability of the fault when water inrush through fault occurs, some water inrush cases through faults were analyzed, and water injection tests which drilled one injection borehole and one observation borehole into the fault zone were carried out at one coal mine. The breakdown pressure, reopening pressure, as well as the initial water seepage pressure, impermeability and the initial hydraulic conductivity of Puzizhier fault, were obtained from the result of the water injection tests. The study shows that water seepage in faults goes through three stages which consist of pore flow, fracture flow and pipe flow. It shows a process of the fine particulates and existing in-fill in the fault zone washing out and original and newborn cracks expanding and connecting. The results of water injection tests can be thought to show the fault healing effect under the underground pressure. In addition, the risk of water inrush through faults owes a great deal to the characteristic of water source. ARTICLE INFO

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“…Therefore, over the past few years, field and laboratory investigations of the effects of groundwater inrush on hydraulic and mechanical properties of rocks (Bai et al, 2013), and consequently mining environment (Bai and Miao, 2016), have been carried out extensively (e.g., Wu and Zhou, 2008;Ma et al, 2015a). The results from these investigations show that high pressure groundwater can break through the reduced stress zones around the mining face and leak into the working areas which can potentially trigger the hazardous water inrush incident (Li et al, 2011;Miao et al, 2011a).…”

Section: Introductionmentioning

confidence: 99%

Variations of hydraulic properties of granular sandstones during water inrush: Effect of small particle migration

Rezania

et al. 2017

Engineering Geology

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The evaluation of the hydraulic properties evolution of granular sandstones in relation with groundwater inrush within faults is an important issue for mining engineering applications. This paper presents the results of an experimental investigation of small particle migration from granular sandstone samples under different original porosities, particle size compositions and water flow pressures. A new rock testing system has been setup to carry out the tests. Based on the results, it is observed that the overall permeability evolution during the tests can be divided into four different phases, including i) re-arrangement of large rock fragments, ii) water inrush with substantial particle migration, iii) continued moderate particles seepage, and iv) steady state water flow. The crushing of edges and corners of large rock fragments, and the evolution of the fracture network has mainly been observed in the first two phases of the tests. The results indicate that the migration of small particles has an essential effect on permeability and porosity increase during water inrush through fractured sandstone. The samples with higher original porosity, higher percentage of fine particles in their formation and under higher water flow pressures, achieve higher permeability and porosity values when the test is complete. Furthermore, using the measured data, the performances of a number of empirical models, for permeability evolution in fractured porous media, have been studied. The prediction results indicate that not all of the fractures in a sample domain contribute in small particle migration. There are parts of the fracture network that are not effective in particle flow, a sample with less original porosity, more fine particles and under lower water pressure shows less ineffective fractures. Therefore, using the concept of the effective porosity (fracture) is sufficient enough for the flow calculation.Keywords: granular sandstone; groundwater inrush; particle migration; permeability; porosity. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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Mechanical behavior of groundwater seepage in karst collapse pillars

Cited by 124 publications

References 18 publications

Predicting Erosion-Induced Water Inrush of Karst Collapse Pillars Using Inverse Velocity Theory

Predicting Erosion-Induced Water Inrush of Karst Collapse Pillars Using Inverse Velocity Theory

Analytical and experimental study of water seepage propagation behavior in the fault

Variations of hydraulic properties of granular sandstones during water inrush: Effect of small particle migration

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