The height of fractured water-conducting zone in undermined rock strata

Miao, Xiaoyu; Cui, Ximin; Jin-an, Wang; Xu, Jialin

doi:10.1016/j.enggeo.2011.03.009

Cited by 192 publications

(90 citation statements)

References 3 publications

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“…Compared with the coal mines with deep mining depth, the overburden strata movement and the distribution of the mining induced fractures are quite different in the coal mines in Shaanxi coal field (see Figure 1). When mining in deep depth (Figure 1(a)), the overburden strata over the goaf can be stable due to the effect of pressured arch, and the height of the mining induced fractures is usually 15 to 20 times of the height of mined coal seam [1]. However, when the mining depth is shallow (Figure 1(b)), the mining induced fractures may go through the rock layers to the sand bed, or even to the ground surface ( Figure 2).…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Liu

et al. 2017

Geofluids

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Water and sand inrush is one of the most serious threats in some shallow coal mines in China. In order to understand the process of sand inrush, experiments were performed to obtain the criterion for sand inrush. First, seepage tests were carried out to study the hydraulic properties of granular sandstone. The results indicate that seepage velocity has a linear relation with the porosity and particle-size distribution parameter. Then, sand inrush tests were conducted to investigate the critical conditions for sand inrush occurrence. It is determined that the sand inrush zone can be clearly distinguished based on the values of porosity and particle-size distribution parameter. Additionally, sand inrush tended to happen in the conditions of high porosity, high seepage velocity, and large particle-size distribution parameter. Further, general principles for preventing the water and sand inrush were proposed, such as reducing the porosity, improving the pore structure, and decreasing the seepage velocity. The proposed principles have been successfully used in situ to control the water and sand inrush.

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Section: Introductionmentioning

confidence: 99%

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

Zhang

Liu

et al. 2017

Geofluids

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“…Due to the importance of the FWCZ, there has been much interest in studies of the FWCZ in mining research (Bureau et al, 1983;Gui et al, 1997;He et al, 1991;Industry, 2004;Lu and Wang, 2015;Ma et al, 2013;Miao et al, 2011;Peng and Zhang, 2007;Peng, 1992;Qian et al, 2003Qian et al, , 2010Teng, 2011;Tu, 2004;Wu et al, 2008;Xu et al, 2010;Yang and Gao, 1982;Yuan and Wu, 2003;Yuan et al, 2015;Zhang, 2005;Zhang and Shen, 2004;Zhang and Peng, 2005). These studies show that the main factors influencing the height and distribution pattern of the FWCZ are the lithology of the strata, the coal mining method, and the thickness of the overlying strata.…”

Section: Impact Of Thick Alluvial Soil On a Fractured Water-conductinmentioning

confidence: 99%

“…L boreholes with liquid (Luo, 1982;Miao et al, 2011;Yang and Gao, 1982). The permeability of the rock mass is determined mainly by the amount of absorbed liquid.…”

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confidence: 99%

Impact of thick alluvial soil on a fractured water-conducting zone: An example from Huainan coal mine, China

Zhou

et al. 2016

J. S. Afr. Inst. Min. Metall.

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“…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). The characteristics of confined aquifer, combined with the mining-induced strata failure (Meng et al, 2016) and the inherent geological structures of the field (Huang et al, 2016), such as water conducting faults, are among the main factors that set off such events (Li and Zhou, 2006;Li et al, 2011;Wu and Zhou, 2008;Zhang et al, 2014;Zhu et al, 2013;Zhu and Wei, 2011).…”

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

204

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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The height of fractured water-conducting zone in undermined rock strata

Cited by 192 publications

References 3 publications

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

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

Impact of thick alluvial soil on a fractured water-conducting zone: An example from Huainan coal mine, China

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

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