In situ investigation of the excavation-loose zone in surrounding rocks from mining complex coal seams

Tian, Maolin; Han, Lijun; Meng, Qinglin; Jin, Yuhao; Meng, Lingdong

doi:10.1016/j.jappgeo.2019.06.008

Cited by 20 publications

(10 citation statements)

References 24 publications

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“…Then, geographically weighted regression (GWR) models were trained to predict the three layers' thicknesses at the unvisited sites, and the paleotopography was reconstructed based on these thickness maps. structure (Tian et al, 2019). A high frequency leads to a fine resolution with a shallow penetration depth, and vice versa.…”

Section: Paleotopographic Reconstructionmentioning

confidence: 99%

“…Using non-invasive detection technology, geophysical methods can be performed near the surface and are widely used to image spatial information beneath landscapes (Guo and Lin, 2016;Parsekian et al, 2015;Tian et al, 2019). Ground-penetrating radar (GPR) may be one of the most robust geophysical tools that can image the structures of subsurface strata in critical zone science (Kaufmann et al, 2018;Parsekian et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Ground-penetrating radar (GPR) may be one of the most robust geophysical tools that can image the structures of subsurface strata in critical zone science (Kaufmann et al, 2018;Parsekian et al, 2015). Therefore, GPR has been widely utilized for the retrieval of regolith thickness, the bedrock-regolith interface and soil depth (Orlando et al, 2016;Simeoni et al, 2009;Tian et al, 2019). In a recent study, a 100 MHz antenna was used to image peat thicknesses exceeding 5 m at a centimetre spatial resolution (Comas et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Paleotopography continues to drive surface to deep-layer interactions in a subtropical Critical Zone Observatory

Song¹,

Wu²,

Hallett³

et al. 2020

Journal of Applied Geophysics

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Subsurface critical zone structures (SCZ S ) refer to the spatial variation in the interactive layers underground. Although SCZ S greatly affect terrestrial biogeochemical and hydrological cycles, underpinning mechanisms are poorly documented. Herein, we characterized the SCZ S of a typical red soil in subtropical China, a type of soil with vast global distribution. The thickness information of three layers was derived from hand augers, boreholes and ground-penetrating radar (GPR) radargrams and incorporated into geographically weighted regression (GWR) models for the reconstruction of paleotopography (Cretaceous sandstone). The interpreted GPR results in terms of thicknesses and interfaces for the three layers were consistent with the borehole logs. The trained GWR models accounted for 43%-77% of the spatial variations in the three layers. The paleotopographic elevations were highly correlated with those of the current land surface (r=0.85). Spatial analysis showed that the rougher paleotopography was inherited by the current landform. The SCZ S evolution involving mainly the mantling covered by Quaternary red clay (QRC) was primarily driven by terrain attributes. These findings may enhance our understanding of the interaction between the paleoclimate and paleoenvironment. The combination of geophysical techniques, geochemical indicators and spatial prediction techniques provides an effective tool for understanding QRC landform evolution.

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Section: Paleotopographic Reconstructionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Paleotopography continues to drive surface to deep-layer interactions in a subtropical Critical Zone Observatory

Song¹,

Wu²,

Hallett³

et al. 2020

Journal of Applied Geophysics

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“…In fact, the physical, mechanical, hydraulic and geochemical properties of rocks are considerably altered in the EDZ. [30][31][32] It should also be noted that by excavations, according to the relevant conditions, strain elastic energy can be released; 33 and rockbursts could be generated. 34,35 When the tunnelling takes place below the groundwater table, the stored groundwater is perturbed.…”

Section: Groundwater Inflows Triggering and Mechanisms Into Rocks Tunnelsmentioning

confidence: 99%

Evaluation methods for groundwater inflows into rock tunnels: a state-of-the-art review

Frenelus¹,

Peng²,

Zhang³

2021

IJH

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Groundwater inflow into tunnels is always a salient topic in Hydrology, Hydraulic Engineering, Hydrogeology, Rock Engineering and allied sciences. In fact, tunnels particularly built below the groundwater table, often face groundwater inflows during their excavation, and even sometimes after they are put into operation. These inflows, habitually regarded as unpredictable geological hazards, cause instabilities in the surrounding rocks of tunnels, and lead to considerable damages such as injuries, loss of lives, and huge-scaled economic expenses. It is argued that groundwater conditions are of decisive significance for the design and running of tunnels. Therefore, accurate prediction or evaluation of groundwater inflows into tunnels is of paramount importance. Such prediction, although it is still challenging, has been broached by many researchers with diverse methods. However, a state-of-the-art review of these methods has not yet been presented. This paper reviews the assessment methods of groundwater inflows into tunnels built in rocky media. The results mainly include analytical, semi-analytical, empirical, semi-empirical, numerical, machine learning, and other methods used in the field. This was made possible by selecting and analysing relevant scientific articles published by various worldwide Journals. In addition, some recommendations and future trends are pointed out. This paper can provide useful references in understanding groundwater inflows prediction in different points of view and their limits in terms of applicability and accuracy.

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“…Since the end of the last century, researchers have performed numerous on-site measurement works to measure the accuracy of floor failure depths. Currently, six main methods exist: multipleposition extensometer [16], borehole strain [17,18], borehole peeping [19], computed tomography electronic imaging [20,21], ground penetrating radar detection [22,23], and microseismic monitoring [24][25][26]. Owing to the wider application of optical fibers in the past two years, they have begun to be used in coal mines, e.g., the Brillouin optical time domain reflectometer to measure floor failure depth [27,28].…”

Section: Introductionmentioning

confidence: 99%

Mining Failure Response Characteristics of Stope Floor: A Case of Renlou Coal Mine

Chang

2020

Advances in Civil Engineering

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Currently, shallow coal resources are being exhausted gradually, mining depth is continuing to extend downward, and hydrogeological conditions are becoming increasingly complex. Therefore, accurate determination of the failure floor position is necessary to perform multiple-seam mining. In this study, the 7255 working face of the Renlou coal mine is regarded as the research object. Through a comprehensive measurement of ground penetrating radar detection and fixed-point grating optical fibers, the law of floor deformation and failure is analyzed dynamically, and the characteristics of the floor rock deformation response are discussed. The results of on-site monitoring indicate that the mining effect of the working face is greater than that of the tectonic stress. With the advance of the working face, the deformation of the shallow area (0–8 m) first increases gradually, then increases rapidly, and finally increases gradually again; the middle area (8–19 m) experiences three stages, from a gentle increase to temporary stability and then a rapid increase; the deep area (19–29 m) undergoes three stages, from being stable to increasing and then being stable again. After mining, the floor of the working face can be classified into four areas in the vertical direction: complete failure area (0–5 m), poor severe influence area (5–11 m), failure development area (11–19 m), and elastic deformation area (19–29 m). Mining-induced stresses cause resistance at the interface of different lithologies and weaken the effect of downward propagation. Coal seams and the interface between different lithologies are more prone to deformation. The results can provide a certain reference basis for the advanced exploration scheme of the underlying seam mining under the multiple-seam mining method, as well as provide a new approach for floor failure depth measurement.

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In situ investigation of the excavation-loose zone in surrounding rocks from mining complex coal seams

Cited by 20 publications

References 24 publications

Paleotopography continues to drive surface to deep-layer interactions in a subtropical Critical Zone Observatory

Paleotopography continues to drive surface to deep-layer interactions in a subtropical Critical Zone Observatory

Evaluation methods for groundwater inflows into rock tunnels: a state-of-the-art review

Mining Failure Response Characteristics of Stope Floor: A Case of Renlou Coal Mine

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