Effect of Particle Mixture on Seepage Properties of Crushed Mudstones

Ma, Dan; Bai, Haibo; Chen, Zhanqing; Pu, Hai

doi:10.1007/s11242-015-0473-1

Cited by 37 publications

(26 citation statements)

References 35 publications

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“…Yao [12] experimentally studied the evolution of the crushed rock mass seepage properties under different particle sizes and stresses and analyzed particle migration feature and the KCPs water inrush mechanism. Moreover, there are also some experimental studies focused on the permeability change of the KCPs to investigate water inrush mechanisms [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…Since then, many experiments on the water flow in fractured rocks had been carried out [1][2][3][24][25][26][27][28]. Specifically, Miao et al [1] analyzed the seepage properties of broken sandstone with different porosities; Ma et al [2,3] obtained the relationship between the permeability and variable grain diameters under variable axial displacements. They also investigated the effect of particle size mixture on the seepage properties and compaction behaviors of crushed mudstones.…”

Section: Geofluidsmentioning

confidence: 99%

“…The Forchheimer equation [31] can be used to describe the relationship between the water pressure gradient and the flow velocity in crushed rocks [1,3]. For a one-dimensional non-Darcy flow, the relationship can be expressed as…”

Section: Permeability Calculationmentioning

confidence: 99%

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Permeability Evolution and Particle Size Distribution of Saturated Crushed Sandstone under Compression

Chen

Zhang

et al. 2018

Geofluids

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In this research, the particle size distribution and permeability of saturated crushed sandstone under variable axial stresses (0,2,4,8,12, and 16 MPa) were studied. X-ray Computed Tomography results revealed that particle crushing is likely to occur considerably as the axial stress is approaching 4 MPa, which results in the change of pore structure greatly. During compression, the particle size distribution satisfies the fractal condition well, and the fractal dimension of particle size distribution is an effective method for describing the particle crushing state of saturated crushed sandstone. When the axial stress increases from 0 MPa to 4 MPa, the fractal dimension of the particle size distribution increases rapidly by over 60% of the total increase (0-16 MPa), and the permeability decreases sharply by about 85% of the total decrease. These results indicate that 4 MPa is a key value in controlling the particle size distribution and the permeability of the saturated crushed sandstone under axial compression. The permeability is influenced by the initial gradation of the specimens, and a larger Talbot exponent corresponds to a larger permeability.

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“…Potentially influential aspects, such as the configurational structure of particles within the crushed rock zone and the variations of hydraulic properties have been mainly overlooked in the past studies of the faults (Zhang et al, 2016). A number of researchers have studied the effect of fluid flow on particle rearrangements within a granular setting and have reported strong permeability variation (e.g., Miao et al, 2004Miao et al, , 2011bJohnsen et al, 2007Johnsen et al, , 2008Niebling et al, 2012;Ma et al, 2015bMa et al, , 2016b. Therefore, in addition to the factors such as the geological features of the mining fields (Rutter et al, 2013;Zhang et al, 2014), groundwater condition and extraction percentage of mines (Blodgett and Kuipers, 2002;Booth, 2006), it is also a significant issue to consider the hydraulic properties of granular rocks within the faults.…”

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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100

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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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Effect of Particle Mixture on Seepage Properties of Crushed Mudstones

Cited by 37 publications

References 35 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

Permeability Evolution and Particle Size Distribution of Saturated Crushed Sandstone under Compression

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

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