The Research on Characteristics of Hydraulic Support Advancing Control System in Coal Mining Face

Cao, Liangcai; Sun, Sashuang; Zhang, Yazhu; Guo, Hui; Zhang, Zhen

doi:10.1007/s11277-018-5294-4

Cited by 13 publications

(7 citation statements)

References 3 publications

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“…One is to control the continued subsidence of the overburden, and the other is to transmit the force of the overburden to the floor to limit its deformation. Considering the starting-up condition of the safety valve, the support [31] can be considered as an elastic-slip body. The support in the filling face has two main functions.…”

Section: Establishment Of Mechanical Model and Parametric Analysis 21 Motion Control Model Of Overburden Rock With Longwall Paste Fillingmentioning

confidence: 99%

Motion model and key parameters of overburden strata in longwall filling face

et al. 2021

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When the paste material is filled into the longwall working face of the coal mine, it firstly controls the movement of the overburden strata, thereby limiting the movement of the far field rock layer and reducing the subsidence. With this regard, the paste filling technology of the long-wall mining can address the limitation of “three down, one up” (mining under water body, building and rail, and on karst water body) technology in coal mining, thus improving the extraction rate of coal resource. To control the movement of the overburden strata near the working face, the prerequisite is to clarify the relationship among the parameters, including coal mining thickness, filling body thickness, filling step, filling body strength, etc. On this basis, this paper established an overall mechanical model of the filling body and surrounding rock, and determined the key technical parameters of the overburden movement, i.e., the filling rate, the strength of the filling body, and the filling step. Then, the influence of these parameters on the overburden movement and abutment pressure was analyzed through the numerical simulation method. The results show that at a higher filling rate, the overburden motion can be better controlled; the filling step only had a significant effect on the roof subsidence within the relevant step; as the early strength of the filling body was higher, the overburden subsidence was smaller and the abutment pressure in front of the face was better controlled. The research of overburden motion model and its key parameters have a good guiding significance for paste filling in the longwall face of coal mines.

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Section: Establishment Of Mechanical Model and Parametric Analysis 21 Motion Control Model Of Overburden Rock With Longwall Paste Fillingmentioning

confidence: 99%

Motion model and key parameters of overburden strata in longwall filling face

et al. 2021

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“…As shown in Figure 2, the specific mining process is as follows: comprehensive mechanized mining is conducted in the upper layer, where tail salt from the aboveground orewashing plant enters the storage bin through the feed well [7][8][9] and is further filled into the goaf using machines such as the underground belt conveyor, self-moving transfer machine, and porous bottom discharge conveyor. It is filled tightly under the tamping action of the filling hydraulic support [10][11][12]. After compaction of the tail salt is stabilized, mining in the lower layer is carried out, and the pillars were retained.…”

Section: Technical Principlesmentioning

confidence: 99%

Effect of Compressive Behaviours of Tail Salt Filling Materials on Roof Deformation in Potash Mine

Wang

Zhang

et al. 2021

Advances in Civil Engineering

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To resolve the problem of top mine instability and the consequent ecological damage caused by different grades of ore deposits in the layered mining process, layered filling-pillar-mining-displacement method (LFPMD) is proposed using a potash mine as an example. Based on the operation principles of the tail salt filling system, the mechanical behaviours of the tail salt under initial tamping and overburden loading were obtained through compaction tests in the laboratory. In addition, the mining-filling mass ratio of tail salt was derived. Based on the mining geological conditions of a potash mine in Laos and the compaction characteristics of tail salt, a mechanical model of top control by tail salt and a numerical model of top control by the pillars were established to discuss the stability of the upper-layer top mine and the lower-layer top mine. It was found that when the elastic foundation coefficient of the tail salt is greater than 550 MN·m−3, and the width of the retained pillars is 10 m, stability of the upper layer and the lower layer can be guaranteed. The results revealed that the LFPMD method can ensure stability of the overburden in the stope and reduce environmental damage while treating tail salt underground.

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“…Zhao et al [9] proposed technology of hydraulic support constant load subsection adjustment; Average cutting time of shearer is shortened by 21.7 % by this technology, which effectively weakens coal wall and meets requirements of subsection mining for thick coal seam. Wang et al [10][11][12][13] analysed stress, stability and electro-hydraulic control system of hydraulic support pillar, effectively reducing the failure rate of hydraulic support and increasing its stability. Cheng et al [14] analysed influence of pitch angle coal seam and mining advancing speed on hydraulic support resistance, put forward specific measures to reasonably improve tunnelling speed and control mining height, which are beneficial to direct hydraulic stability.…”

Section: State Of the Artmentioning

confidence: 99%

Structural Analysis on Impact-Mechanical Properties of Ultra-High Hydraulic Support

Yang¹,

Sun²,

Jiang³

et al. 2020

Int. j. simul. model.

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With the increase of the mining height, the operational condition of the hydraulic support is getting worse. Since the column and the balance jack are both regarded as rigid structural parts or springs with constant stiffness, this simplification cannot reflect the characteristics of each stage of the working process. To improve the analysis accuracy, a rigidity-variable impact dynamic simulation platform for hydraulic support with ultra-large mining height based on rigidity-flexibility coupling is constructed in this study. Firstly, stress states of hinge joints of the support when parallel surface loads, raising surface loads and down surface loads act on the upper beam were simulated, and critical loads of different hinge joints were recognized. Secondly, dangerous impact positions of support corresponding to different hinge joints were found. Finally, the overall influences of impact loads on stress state of the hydraulic support were summarized. Results show that under 6000 kN impact load, the maximum force variation coefficient at the hinge point of the shield beam of the support roof is 10.5, and it's the most dangerous hinged position. This study has certain guiding significance for the optimization of the support structure.

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The Research on Characteristics of Hydraulic Support Advancing Control System in Coal Mining Face

Cited by 13 publications

References 3 publications

Motion model and key parameters of overburden strata in longwall filling face

Motion model and key parameters of overburden strata in longwall filling face

Effect of Compressive Behaviours of Tail Salt Filling Materials on Roof Deformation in Potash Mine

Structural Analysis on Impact-Mechanical Properties of Ultra-High Hydraulic Support

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