Impact of mining-induced bed separation spaces on a cretaceous aquifer: a case study of the Yingpanhao coal mine, Ordos Basin, China

Chen, Weichi; Li, Wenping; He, Jianghui; Qiao, Wei; Wang, Qiqing; Yang, Yuesuo

doi:10.1007/s10040-022-02455-y

Cited by 8 publications

(6 citation statements)

References 24 publications

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“…The sandstones were collected from the Cretaceous Luohe Formation in the Ordos Basin, China, and included braided fluvial and desert facies; the specific information about the sandstone was provided in our previous literature [23,24]. To eliminate the interference of irrelevant factors, fine sandstone without obvious bedding was selected.…”

Section: Methodology 21 Sample Preparationmentioning

confidence: 99%

Acoustic Emission Characteristics of the Water Weakening Effect on Cretaceous Weakly Cemented Sandstone

Yang

2023

Sustainability

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Rock mass stability is often affected by water–rock interaction in underground engineering construction. Cretaceous sandstones often have weak cementation, low strength and strong water-holding capacity, and their rock mass strength is easily weakened by these activities. In this paper, the uniaxial compressive strength (UCS) and tensile strength (TS) of weakly cemented Cretaceous sandstones from different sedimentary facies under natural and saturated conditions were tested, and the loading process was monitored by the acoustic emission (AE) technique. The results show that the existence of water obviously weakened the mechanical properties of weakly cemented sandstone. The UCS and TS of saturated braided river facies sandstone decreased to 41.24% and 35.95% of their natural states, respectively, while those of desert facies sandstone decreased to 32.90% and 26.98% of their natural states, respectively. The AE characteristics of sandstone from different sedimentary facies were similar during loading due to weakening by water, including a decrease in cumulative AE energy, b-value fluctuation and reduction in the peak frequency distribution range. Fracture in the Brazilian splitting test was mainly due to the rapid initiation and coalescence of microcracks near the peak point. However, in the uniaxial compression test, the macro fractures were caused by many microcracks that occurred continuously during loading and finally connected. The high quartz and low feldspar contents strengthened the mechanical properties of braided fluvial facies sandstone compared to those of desert facies sandstone and lessened the effect of water weakening.

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Section: Methodology 21 Sample Preparationmentioning

confidence: 99%

Acoustic Emission Characteristics of the Water Weakening Effect on Cretaceous Weakly Cemented Sandstone

Yang

2023

Sustainability

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“…When the overlying rock is moved and deformed, a shear deformation is easy to occur between the rock boundaries of the stope and the bedding separation deformation in the middle cover of the stope (Wang, Jiang et al 2020, Zhang, Deng et al 2020, Chen, Li et al 2022. It is easy to cut the casing at the boundary of the stope and the tensile shrinkage damage occurs in the overburden of the overburden, whereas the non-uniform extrusion failure occurs in the combined rock beam, as presented in Fig.…”

Section: Deformation and Failure Law Of Surface Well In Mining Areamentioning

confidence: 99%

Key technology and application of surface well drainage of coalbed methane in mining area of high gas mine

Fu,

Wen,

Zhang

et al. 2024

Preprint

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The coalbed methane drainage with surface well, under the mining effects in a high gas coal mine has become increasingly important, especially for a complex region for the coalbed methane drainage. In contrast, due to the effects of coal mining, the surface wells are prone to deformation and damage. In this paper, a displacement and deformation model for the overlying strata was established. Three forms of deformation and failure of the surface well casing were proposed, such as shearing, stretching and uneven extrusion. Moreover, the mathematical model functions of “S” - type shear deformation, delamination tensile deformation and non-uniform extrusion for the surface well were established. In the ShanXi Coal Group YueCheng Mine, on the mining affected area surface well the coalbed methane drainage practice was conducted, producing a good coalbed methane drainage effect. YCCD-04 well without local protective device was deformed and damaged, and the dynamic deformation and failure process of surface well was detected by well imager; YCCD-02 well with local protective device has experienced mining and gas drainage effect is good, which verifies the effectiveness of local protective device. The YCCD-02 well coalbed methane drainage was 35 months in duration and the cumulative extraction of coalbed methane drainage volume was 1.3×107 m3. Simultaneously, the problem of gas control in the working face was solved, to ensure the safety of coal mining, achieving good social and economic effects.

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“…The Quaternary and Cretaceous aquifer groups have different thicknesses, but they generally exhibit a continuous distribution. Stratigraphic integration is relatively gentle among the Jurassic strata, and the 2 # coal seam is also evenly distributed in the basin because of the stress action of the upper strata [45].…”

Section: Geology and Hydrogeologymentioning

confidence: 99%

“…Therefore, the effective thickness of the drainage layer is defined as the distance between the top boundary of the fractured zone with water flow and the bottom boundary of the coal seam. Considering the current situation of deep buried coal seams in HRB [45], with coal mining, the largest water-conducting layer would include only the Jurassic formation, and it would be separated from the Cretaceous bottom by a certain distance. The distance would be 100.87 m in the Yinpanhao (Yph) coal mine, 94.22 m in the Dahaize (Dhz) coal mine, and 110.9 m in the Balasu (Bls) coal mine.…”

Section: Mine Inflowmentioning

confidence: 99%

Ecological Impact Prediction of Groundwater Change in Phreatic Aquifer under Multi-Mining Conditions

Zhou

Liu

Duan

2022

IJGI

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In aeolian sandy grass shoal catchment areas that rely heavily on groundwater, mining-induced geological deformation and aquifer drainage are likely to cause irreversible damage to natural groundwater systems and affect the original circulation of groundwater, thus threatening the ecological environment. This study aimed to predict the impact of groundwater level decline on vegetation growth in the Hailiutu River Basin (HRB), which is a coal-field area. Based on remote-sensing data, the land use/cover change was interpreted and analyzed, and the central areas of greensward land in the basin were determined. Subsequently, the correlation between groundwater depth and grassland distribution was analyzed. Then, the groundwater system under natural conditions was modeled using MODFLOW, and the groundwater flow field in 2029 was predicted by loading the generalized treatment of coal mine drainage water to the model. The change in groundwater depth caused by coal mining and its influence on the grassland were obtained. The results show that coal mining will decrease the groundwater depth, which would induce degradation risks in 4 of the original 34 aggregation centers of greensward land that originally depended on groundwater for growth in HRB because they exceeded the groundwater threshold. The prediction results show that the maximum settlement of groundwater level can reach 5 m in the northern (Yinpanhao), 6 m in the eastern (Dahaize), and 10 m in the southern (Balasu) region of HRB. Attention should be paid to vegetation degradation in areas where groundwater depth exceeds the minimum threshold for plant growth.

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Impact of mining-induced bed separation spaces on a cretaceous aquifer: a case study of the Yingpanhao coal mine, Ordos Basin, China

Cited by 8 publications

References 24 publications

Acoustic Emission Characteristics of the Water Weakening Effect on Cretaceous Weakly Cemented Sandstone

Acoustic Emission Characteristics of the Water Weakening Effect on Cretaceous Weakly Cemented Sandstone

Key technology and application of surface well drainage of coalbed methane in mining area of high gas mine

Ecological Impact Prediction of Groundwater Change in Phreatic Aquifer under Multi-Mining Conditions

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