Geofluids
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Acceptance rate47%
Submission to final decision86 days
Acceptance to publication41 days
CiteScore2.400
Journal Citation Indicator0.640
Impact Factor2.176

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Geofluids publishes research relating to the role of fluids in mineralogical, chemical, and structural evolution of the Earth’s crust.

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Research Article

Feasibility of Water Injection on the Coal Wall of Loose Thick Coal Seam to Prevent Rib Spalling and Its Optimal Moisture Content

Rib spalling of loose thick coal wall seriously restricts the high yield, high efficiency of coal mine, affecting the safety production of coal mine. Based on the engineering background of water injection to control rib spalling of loose thick coal seam in the Luling Coal Mine of the Huaibei Mining Group, the mineral composition and microscopic morphology of III811 loose thick coal seam in Luling Coal Mine were analyzed by X-ray diffraction and scanning electron microscope. Through uniaxial compressive strength tests of coal samples with different moisture content, the relationship between uniaxial compressive strength, peak strain and moisture content, and their failure characteristics was studied. The results showed that the natural moisture content of III811 coal seam in Luling coal mine is low, and it contains a large amount of kaolinite (75.2%) belonging to clay mineral which is easy to absorb water and then expand, fully bond loose coal body and fill cracks to improve the integrity of coal body. These two factors provide feasibility for injecting water in workface to prevent rib spalling. The compressive strength of coal samples decreased slowly with the raise of moisture content, while the peak strain increased first and then decreased. The peak strain was the largest when the water content was 6.0%. The failure degree of coal samples intensifies with the increase of water content, and the failure form changes from tensile failure at low water content to shear failure at high water content. Considering the relationship between compressive strength, peak strain, and moisture content of coal samples, the optimal moisture content of III811 workface in loose thick coal seam is determined to be 4.5% ~6%.

Review Article

A Review of the Research on Thermo-Hydro-Mechanical Coupling for the Frozen Soil

This paper reviews the history of the research development on the coupling mechanism of the multiphysical field, e.g., thermo-hydro-mechanical (THM), for frozen soil. The objective is to deepen the current understanding of the theories and mechanism of multiphysical field coupling in the frozen soil and the dynamic changes in the temperature, moisture, and stress fields during soil freezing. A new differential equation of the coupling of temperature field and moisture field is proposed. Based on the DiscreteFrechetDist algorithm, a fitting method of evaluating a curve is proposed. The paper is expected to help understand the soil freezing process in cold regions and enhance the innovativeness of the research methodologies dealing with multifield coupling for the frozen soil.

Research Article

The Research of the Influence on Stress below the Roadway Floor of the Coal Seam Becoming Thin

Stress is the important factor of dynamic disaster in the coal mine. Stress is closely related with surrounding geological conditions. The geological tectonic area which exists high stress has a greater impact on dynamic disaster. However, local changes of the coal seam in the thickness may be sedimentary in origin and also result in the dynamic disasters. The paper studies the influence on stress with coal seam thickness varying below the roadway floor by means of numerical models. And the degree of influence on stress of the thinning with the burial depth is studied, too. The results of the research carried out were similar to the field test. Meantime, the results show that the shorter and narrower of the coal seam with thinning, the greater both horizontal and vertical stresses generated in that area. The difference is that the horizontal overstress increment is more than the vertical’s. It also reveals an overstress phenomenon has a great relationship with the geometry of the coal seam more and not the burial depth of the heading face. The results drawn in this paper may be helpful to predict and control dynamic disasters when the geometry of the coal seam varies.

Research Article

Application and Research of Gangue Partial-Filling Mining Method in Preventing Water Inrush from Floor

Coal gangue produced during coal production not only poses a serious threat to the ground environment but also imposes serious economic burdens on the mine. The partial-filling mining (PFM) method proposed in this paper can make full use of coal gangue and is of great significance to the prevention and control of water disasters at the working face. The specific process used to implement this method is to first divide the working face into several narrow working faces and then fill the filling body into part of the goaf. The ability of PFM to restrain floor water inrush is analyzed by physical simulation, and the field application research is carried out at the No. 9211 mining face of Bucun Coal Mine in Shandong, China. The physical simulation results show that the failure depth of this layer is less than 5 m. The field measurements reveal that the maximum compression deformation of the filling body is 89.1 mm, and the maximum floor failure depth of the floor is only 8.6 m. Comparative analysis indicates that the floor failure depth of the No. 9211 working face with the local filling method is 4.6 m lower than that of the No. 9110 working face with the strip mining method. In addition, no water inrush accident occurs at the No. 9211 working face during mining. Therefore, PFM not only controls the floor damage depth effectively but also consumes coal gangue to protect the mine environment.

Research Article

Determination of Reasonable Width of Filling Body for Gob-Side Entry Retaining in Mining Face with Large Cutting Height

When gob-side entry retaining is adopted in the mining face with large cutting height, due to large stope space, strong dynamic pressure, and other reasons, the filling body is usually broken and unstable due to improper width of filling body, and the stability of surrounding rock of a roadway is poor. Taking the actual project of Shaqu mine as the background, we analyze the stability factors of gob-side entry retaining with large mining height, and considering the lateral pressure and overlying load on the filling body, the mechanical model of a gob-side retaining roadway is established, the calculation method of the reserved width of the filling body is simplified, and the reasonable width of the filling body is obtained quantitatively. Through the monitoring results of numerical simulation and field test, the rationality of the calculation results of the reserved width of filling body is verified. The results show that if the width of the filling body is too small, it will not be able to bear the load of the overlying strata, resulting in the fragmentation of the filling body. The larger the width of the filling body, the greater the cutting resistance provided, which can reduce timely the stress on the roadway and above the filling body, and the more stable the retaining roadway is, but when the width increases to a certain value, the displacement of the surrounding rock of the roadway has changed little. When the width of the filling body is 4 m, the stability of gob-side entry retaining can be guaranteed.

Research Article

Exploration on Formation Mechanism of Core Discing Based on Energy Analysis

The basic premise of deep in situ fluidized mining is to study the in situ stress state of deep rocks, and coring is one of the basic physical means. However, core discing often occurs in the process of coring. And core discing is one of the symbols of high in situ stress in deep engineering area, and revealing the mechanical response of core stub under different conditions is an important premise to explore the formation mechanism of core discing. Therefore, the effects of in situ stress combination condition, core diameter, and drilling depth on the maximum tensile stress after core stub unloading are discussed by PFC2D discrete element numerical simulation method, and the formation mechanism of core discing is preliminarily explored based on strain energy and dissipated energy. Research shows that in situ stress combination is the most dominant factor of core discing. When the hydrostatic stress increases from 40 MPa to 80 MPa, the maximum tensile stress at the core stub increases by 98.42%. When the horizontal stress is 60 MPa and the axial stress increases from 40 MPa to 100 MPa, the maximum tensile stress at the core stub increases by 53.33%. However, when the axial stress is 60 MPa and the horizontal stress increases from 40 MPa to 80 MPa, the maximum tensile stress at the core stub first increases and then decreases, and there is an inflection point when the horizontal stress is 75 MPa. When the core diameter increases from 8.00 mm to 13.00 mm, the maximum tensile stress at the core stub increases by 1.58 times. When the drilling depth increases from 3.00 cm to 4.00 cm, the maximum tensile stress at the core stub increases by 4.01 times; that is, small diameter cores and cores with large drilling depth are more prone to core discing. The total energy of the system increases with the increase of in situ stress. When the hydrostatic pressure is 80 MPa, the dissipated energy of the system is 2.80 times greater than that when the hydrostatic pressure is 40 MPa. More energy must be dissipated when the core discing occurs under higher in situ stress conditions. It is preliminarily proved that the formation mechanism of core discing is that the tensile cracks extend and penetrate at the core stub, and the core is pulled off to form a core disc, which is reciprocating to produce core discing. The research results are expected to provide a certain reference for understanding the formation mechanism of core discing and provide useful ideas for the related research of discing phenomenon.

Geofluids
Publishing Collaboration
More info
Wiley Hindawi logo
 Journal metrics
Acceptance rate47%
Submission to final decision86 days
Acceptance to publication41 days
CiteScore2.400
Journal Citation Indicator0.640
Impact Factor2.176
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Article of the Year Award: Outstanding research contributions of 2020, as selected by our Chief Editors. Read the winning articles.