Variation Characteristics of Mass-Loss Rate in Dynamic Seepage System of the Broken Rocks

Wang, Luzhen; Kong, Heng

doi:10.1155/2018/7137601

Cited by 20 publications

(12 citation statements)

References 17 publications

(16 reference statements)

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“…Considering that different gradation structures have different pore characteristics, the sample aggregate prepared in this paper includes four sizes, and the mass distribution within each particle size range is subject to Talbot theory 33 , namely: …”

Section: Methodsmentioning

confidence: 99%

Re-crushing process and non-Darcian seepage characteristics of broken coal medium in coal mine water inrush

Pang

Zhang

Guo

et al. 2021

Sci Rep

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The initiation process of the mine water inrush accident, the essence of this process is the sudden change of the seepage state of the broken coal medium under pressure and the instability of the skeleton. In order to study the re-crushing mechanism and seepage characteristics of the broken coal medium under load, a set of three-axis seepage system was designed independently. Using the steady-state infiltration method, multiple flow factors under different particle size combinations and different stress conditions of the broken coal medium were obtained. The results of the study indicate: in one hand, the reduction of the porosity of the broken coal medium will cause the flow channel to be rebuilt, and the sudden change of flow rate will directly lead to the non-Darcian flow behavior. The early stage of compaction mainly affects the permeability k value, and the later stage of compaction mainly affects the non-Darcian β value; On the other hand, the seepage throat in the broken coal medium may have a sharp increase in its flow rate, leading to a sudden change in the flow pattern. The critical Reynolds number is also used to determine whether non-Darcian flow is formed, and its value in the water inrush system is about 40–133; at the same time, the non-Darcian flow in the broken coal medium conforms to the Forchheimer-type flow law. By analyzing the dependence relationship between factors, a seepage factor representation algebraic relationship suitable for Forchheimer type non-Darcian flow of broken coal medium is given, which can be used as a calculation basis in the prevention and treatment of mine water inrush accidents.

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Section: Methodsmentioning

confidence: 99%

Re-crushing process and non-Darcian seepage characteristics of broken coal medium in coal mine water inrush

Pang

Zhang

Guo

et al. 2021

Sci Rep

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“…Taking the specimen with the Talbol power exponent of 0.5, initial height of 120 mm, and loaded water pressure of 3 MPa as an example, the time-varying rules of the lost mass and porosity [34] are shown as Figure 13, especially the timevarying rules in the first 2000 s, which is shown in the right figure. As Figure 13 shows, the lost mass increases with the increase in permeate time, and the varying curve of porosity is nearly the same as the lost mass.…”

Section: E Mass Loss Behavior In the Fractured Rock During Thementioning

confidence: 99%

The Mass Loss Behavior of Fractured Rock in Seepage Process: The Development and Application of a New Seepage Experimental System

Kong

Wang

2018

Advances in Civil Engineering

Self Cite

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In order to study the water-inrush mechanism in fractured geological structure, seepage instability theory is picked up, which considers that water-inrush is the embodiment of seepage instability. Seepage tests are the basis for studying seepage instability in the fractured rock system, while the experimental system and equipment are the foundation of seepage tests. In this paper, we introduce a new experimental system for the seepage test on fractured rock accompanying with mass migration and loss and discuss its development and application. It presents the designed and manufactured experimental system, the subsystems, components and their functions, and the experimental scheme and the experimental process. Compared to the previous experimental system, more functions are satisfied, among which, the most important improvements are realizing a long-term permeate and keeping water pressure stable at a high level. These improvements are verified by a series of tests, and the results show that our experimental system has higher accuracy, stability, and reliability. The distribution of the permeate times and lost mass of different Talbol power exponents are obtained, and the time-varying rules of water pressure, water flow, the lost mass, and porosity are also revealed through the results. Although the experimental system also has some limitations, for instance, the measuring accuracy of pressure transducers and flow transducers, the provided maximum pressure of the quantitative displacement piston pump, the fine particles collection subsystem, etc., we will continue to improve it in our further research.

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“…This is a process of mutual influence and mutual promotion. In recent years, some scholars [25][26][27] have investigated the nonlinear hydraulic properties of variable mass flow by genetic algorithm. Although a series of data can be obtained under seepage-induced erosion, the evolution process of seepage has not been observed.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Water Flow Evolution in a Filled Fracture under Seepage-Induced Erosion

Shao

Zhang

et al. 2020

Water

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Water inrush is a major geological hazard for safe mining and tunnel construction. For the water inrush channel containing mud, sand, and other sediments, it is difficult to predict the change of permeability and water surge, which makes disaster prevention difficult. As a typical water inrush channel, a filled fracture under seepage-induced erosion needs to be focused. In this work, a numerical model for the evolution of flow in a filled fracture under seepage-induced erosion was established, which included the seepage velocity, hydraulic erosion, and permeability of the filling medium. The effects of joint roughness coefficient (JRC) and homogeneity of the filling medium on the seepage evolution are discussed. The results showed that the fracture seepage properties experienced a non-linear change process, and the evolution can be divided into three phases: the slowly varying phase, the rapidly varying phase, and the stable phase. The increase of the JRC hindered the development in flow velocity and erosion. Compared with low homogeneous filling medium, pores in the high homogeneous filling medium were easier to expand and connect, and the seepage characteristics evolved faster. The model established in this study will help to understand the seepage evolution of filled fractures, and can be used to predict the permeability of filled fractures in engineering geology.

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Variation Characteristics of Mass-Loss Rate in Dynamic Seepage System of the Broken Rocks

Cited by 20 publications

References 17 publications

Re-crushing process and non-Darcian seepage characteristics of broken coal medium in coal mine water inrush

Re-crushing process and non-Darcian seepage characteristics of broken coal medium in coal mine water inrush

The Mass Loss Behavior of Fractured Rock in Seepage Process: The Development and Application of a New Seepage Experimental System

Investigation on the Water Flow Evolution in a Filled Fracture under Seepage-Induced Erosion

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