Experiment on Seepage Property and Sand Inrush Criterion for Granular Rock Mass

Zhang, Kai; Zhang, Boyang; Liu, Jiangfeng; Ma, Dexin; Bai, Haibo

doi:10.1155/2017/9352618

Cited by 18 publications

(15 citation statements)

References 14 publications

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“…In recent years, a large number of tunnels have been constructed in unfavorable geology such as completely weathered granite, karst, and fault [1][2][3][4], causing various challenges to the geotechnical engineers, for example, collapse [5], land subsidence [6], groundwater inflow [7,8], and total environmental hazards [9]. The completely weathered granite, one of the typical unfavorable geologies, is widely distributed in subtropical, tropical, and humid temperature zones [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Initial Porosity and Water Pressure on Seepage-Erosion Properties of Water Inrush in Completely Weathered Granite

et al. 2018

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In order to investigate the water inrush mechanism in completely weathered granite, a large-scale triaxial testing system is designed and manufactured, which can induce the mass transfer and monitor the flow properties. Using this system, the effects of water pressure and initial porosity on the mass transfer and flow properties were determined, and the relative critical conditions for water inrush were proposed. The results indicate that (1) the particle transfer could cause an increase in porosity, permeability, and water inflow, which is the essential reason for water inrush in completely weathered granite. (2) Due to the effect of particle transfer, the flow properties may change from a Darcy to a non-Darcy flow, which is a key signal for water inrush. (3) With the increase of water pressure, the mass transfer, permeability, and water inflow increased gradually, and a critical value (p = 0 6 MPa) that caused the water inrush was obtained. Furthermore, with the decrease of initial porosity, the mass transfer and flow properties were suppressed rapidly, and a critical porosity (0.23) to anti-inrush was observed. The results obtained can provide an important reference for understanding the mechanism, forecasting the risk, and taking the effective control measures for water inrush.

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Section: Introductionmentioning

confidence: 99%

“…Walsh [28] and Wang et al [29] studied the permeability under different water pressures and confining pressures. Moreover, many researches showed that the critical conditions existed for water inrush, such as water pressure and excavation thickness [4,30].…”

Section: Introductionmentioning

confidence: 99%

Effects of Initial Porosity and Water Pressure on Seepage-Erosion Properties of Water Inrush in Completely Weathered Granite

et al. 2018

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“…e velocity is calculated by the simultaneous Equations (6), (14), and (20), Equations (6), (15), and (20), Equations (6), (16), and (20), and Equations (17) and (20) when the sandwater mixture ow is, respectively, in laminar ow, e ectively smooth ow, transition region, and rough ow. e calculation results are shown in Table 7, from which it can be known that the sand-water mixture ow belongs to transition region, and the velocity and volume are 15.32 to 17.78 m/s and 310,000 to 350,000 m 3 , respectively.…”

Section: E Calculation Of Computing Methodmentioning

confidence: 99%

“…When the mining depth is shallow, the mininginduced fractures may go through the rock layers to the sand bed, or even to the ground surface. In this situation, the water and sand can move to the goaf through the fractures and granular rock mass, which results in the quicksand disaster [14]. Secondly, the quicksand disaster caused by a borehole from ground surface to underground.…”

Section: Introductionmentioning

confidence: 99%

A Computing Method for Sand Inrush Quantity through a Borehole in Longde Coal Mine

Zhang

Lin

2018

Advances in Civil Engineering

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A quicksand disaster through a borehole occurred in Longde coal mine. A lot of aeolian sand, the volume of which is between 310,000 m 3 and 380,000 m 3 , has submerged into the underground space in about 70.5 h. e volume flux of quicksand cannot be calculated accurately by the empirical method. Based on the method of fluid mechanics, an all-purpose computing method for quicksand disaster through a borehole was proposed. e result shows that the inrush volume of sand into underground space was between 310,000 m 3 and 350,000 m 3 , which was consistent with the actual result. To apply and popularize this method, the impact laws of water yield properties of an aquifer on the volume flux were discussed. e all-purpose computing method can be suitably used for the volume flux calculation of quicksand disaster through the borehole.

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“…Water-sand inrush is a most serious mine disaster in western China, particularly in the Shaanxi province, the major energy resource centre of China [1,2]. The typical geological characteristics of the coal mines in this area provide the conditions for the occurrence of water-sand inrush.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Water–Sand Mixed Fluid Initiation and Migration in Porous Skeleton during Water and Sand Inrush

et al. 2020

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Water–sand inrush is one of the most serious disasters for mining in China. The evaluation of the occurrence and development of a high-concentration water and sand mixed fluid is an important issue for mining in China. In this study, contraposing to the 3 phases of water–sand inrush, three kinds of experiments are designed for the investigation of initiation, development, and occurrence of the disaster. A new sand–water transport testing system is setup to perform the tests. The results show that there are two key points in the disaster: (1) sand particle incipient motion and (2) porous skeleton structural instability. The incipient motion of sand grains is accompanied with the phenomena of volumetric dilatation and granular fluidization. The critical velocity of the incipient motion of the water–sand mixed fluid is significantly affected by the particle size and external stress. The interaction between water and sand grains is the key factor affecting the motion characteristics of water–sand mixture. When the hydraulic conditions exceed the threshold, the water and sand grains are mutually promoted, and the aquifer skeleton becomes unstable. Furthermore, during the water–sand inrush, the curves of volumetric flow rates of sand and water, respectively, for different samples manifest as two distinct waveforms.

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Experiment on Seepage Property and Sand Inrush Criterion for Granular Rock Mass

Cited by 18 publications

References 14 publications

Effects of Initial Porosity and Water Pressure on Seepage-Erosion Properties of Water Inrush in Completely Weathered Granite

Effects of Initial Porosity and Water Pressure on Seepage-Erosion Properties of Water Inrush in Completely Weathered Granite

A Computing Method for Sand Inrush Quantity through a Borehole in Longde Coal Mine

Experimental Investigation of Water–Sand Mixed Fluid Initiation and Migration in Porous Skeleton during Water and Sand Inrush

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