Analysis of Water Insulating Effect of Compound Water-Resisting Key Strata in Deep Mining

Ma, Feng; Mao, Xianbiao; Bai, Haibo; Miao, Xiaoyu

doi:10.1016/s1006-1266(07)60001-7

Cited by 37 publications

(18 citation statements)

References 3 publications

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“…Zhang et al [15] and Kuang et al [16] determined the law of fracture and movement of key strata through in situ investigation. Based on the key strata theory, Miao et al [17], Wang et al [18] and Feng et al [19] proposed the concept and principle of the water-resisting key strata for the mining with water preservation, established a mechanical model of the composite water-resisting key strata, and successfully applied it to the prevention and control of water inrush disaster of roof and floor and the protection of water resources in mining area [20]. Based on the theory of key strata, Xu et al [21] and Wang et al [22] studied the influence of the location of the main key strata of the overburden strata on the development height of the water-conducting fracture and proposed a prediction method for the height of the water-conducting fracture zone by the location of the key strata of the overburden strata [23].…”

Section: Introductionmentioning

confidence: 99%

Influence of Key Strata on the Gas Downward Leakage Law in Dual-System of Coal Seam

Jiang

Ma³

2020

Geofluids

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In Datong mining area, CO and other harmful gases were discharged from the gob in the Jurassic overburden strata to the panel of Carboniferous coal seam. To this end, panel 8309 of Tongxin coal mine in Datong mining area was taken as the engineering background; the change law of CO concentration in the upper corner of the panel and the law of mining pressure were studied through field measurement, and the influence of periodic movement of key strata on the downward leakage law of harmful gases was analyzed. In this paper, the fracture law of the key strata and fracture development characteristics of overburden strata were further studied by the similar simulation test, and the influence of the periodic movement of the key strata on the pathway formation of gas downward leakage was analyzed. The results show that the main cause of harmful gas downward leakage in the Jurassic gob is through the fracture produced by the fracture of the higher key strata. If the higher key strata fractures in the coal mining in the Carboniferous system, through fracture connecting the Jurassic gob above the open-off cut and the upper part of the panel are formed, and effective pathways for gas downward leakage are generated. The fracture and rotation of the higher key strata are accompanied by the formation and disappearance of the effective pathway for gas downward leakage above the panel. Then the periodic change of harmful gas discharging to the panel is caused and consistent with the law of mining pressure.

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Section: Introductionmentioning

confidence: 99%

Influence of Key Strata on the Gas Downward Leakage Law in Dual-System of Coal Seam

Jiang

Ma³

2020

Geofluids

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“…The location is shown in Figure . The Chebei Yong begins from the Longdong Reservoir and drains into the Pearl River’s front channel at Dongpu, spanning a total length of 19.40 km and covering a catchment area of 73.65 km 2 …”

Section: Test Equipment and Methodsmentioning

confidence: 99%

Study on the Effect of AO-Coupled Constructed Wetlands on Conventional and Trace Organic Pollutant Treatment

Cai,

Zeng,

Lin

et al. 2023

ACS Omega

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In this study, a pilot-scale integrated process was developed, which combined the integrated biological contact oxidation technology (AO) and the improved constructed wetland technology. The results showed significant removal efficiency for both conventional and trace organic pollutants. The average removal efficiencies for COD, NH4 +-N, and TP were 78.52, 85.95, and 49.47%, respectively. For trace organic pollutants, triclocarban, triclosan, and sulfadiazine, the removal efficiencies reached 60.14, 57.42, and 84.29%, respectively. The AO stage played a crucial role in removing trace organic pollutants, achieving removal efficiencies of 37.28, 43.44, and 83.82% for triclocarban, triclosan, and sulfadiazine, respectively. Subsequent treatment using improved constructed wetland technology with coal slag + gravel fillers demonstrated the highest removal efficiency, with average efficiencies of 68.66, 63.38, and 81.32% for triclocarban, triclosan, and sulfadiazine, respectively. Correlation analysis revealed positive correlations between temperature, precipitation, and the removal efficiency of COD, NH4 +-N, and TP, while negative correlations were observed with the removal efficiency of triclocarban, triclosan, and sulfadiazine. Furthermore, the influent concentrations of triclocarban and triclosan were significantly negatively correlated with the removal efficiency of COD and TP. The presence of triclocarban and triclosan potentially reduced the microbial diversity and hindered sludge sedimentation performance.

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“…This method could clearly identify the defects and the reflected signals at the bottom of the rockbolt to more accurately deduce the defect position and bond length. Zhang et al [11] used self-designed nondestructive testing experimental systems for bond quality to detect whether bond systems have defects and determined the number of defects by using the multiscale entropy method. Wang et al [12] used ultrasonic guided wave technology to detect the initial corrosion of reinforced concrete with defects.…”

Section: Introductionmentioning

confidence: 99%

Propagation Characteristics of Ultrasonic Guided Waves in Grouted Rockbolt Systems with Bond Defects under Different Confining Conditions

Yu¹,

Chen²,

Wang³

et al. 2023

JMP

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A rockbolt acting in the rock mass is subjected to the combined action of the pull-out load and confining pressure, and the bond quality of the rockbolt directly affects the stability of the roadway and cavern. Therefore, in this study, confining pressure and pull-out load are applied to grouted rockbolt systems with bond defects by a numerical simulation method, and the rockbolt is detected by ultrasonic guided waves to study the propagation law of ultrasonic guided waves in defective rockbolt systems and the bond quality of rockbolts under the combined action of pull-out load and confining pressure. The numerical simulation results show that the length and location of bond defects can be detected by ultrasonic guided waves under the combined action of pullout load and confining pressure. Under no pull-out load, with increasing confining pressure, the low-frequency part of the guided wave frequency in the rockbolt increases, the high-frequency part decreases, the weakening effect of the confining pressure on the guided wave propagation law increases, and the bond quality of the rockbolt increases. The existence of defects cannot change the strengthening effect of the confining pressure on the guided wave propagation law under the same pull-out load or the weakening effect of the pull-out load on the guided wave propagation law under the same confining pressure.

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Analysis of Water Insulating Effect of Compound Water-Resisting Key Strata in Deep Mining

Cited by 37 publications

References 3 publications

Influence of Key Strata on the Gas Downward Leakage Law in Dual-System of Coal Seam

Influence of Key Strata on the Gas Downward Leakage Law in Dual-System of Coal Seam

Study on the Effect of AO-Coupled Constructed Wetlands on Conventional and Trace Organic Pollutant Treatment

Propagation Characteristics of Ultrasonic Guided Waves in Grouted Rockbolt Systems with Bond Defects under Different Confining Conditions

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