Nonlinear Dynamics Mechanism of Rock Burst Induced by the Instability of the Layer-Crack Plate Structure in the Coal Wall in Deep Coal Mining

Chen, Yanlong; Lu, Aihong; Mao, Xianbiao; Li, Ming; Zhang, Lianying

doi:10.1155/2017/4051967

Cited by 17 publications

(11 citation statements)

References 28 publications

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“…According to previous research studies, the drilling cuttings' variation curve is very close to the bearing pressure distribution curve of coalface [22,23]. One of the necessary conditions for the occurrence of rock burst is that the bearing pressure reaches or exceeds the ultimate strength of the coal body [24].…”

Section: The Relationship Between the Drilling Cuttings And Energymentioning

confidence: 60%

Combined Early Warning Method for Rock Burst and Its Engineering Application

Qin

Chen

et al. 2019

Advances in Civil Engineering

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Rock burst is a common mine disaster often accompanied with casualties and property damage. In order to effectively predict and prevent the rock burst occurrence, an effective and accurate method for predicting rock burst is necessary. This paper first establishes the relationship between the drilling cuttings and the releasable elastic deformation energy. However, the traditional drilling cutting method has the defect that the drilling depth cannot reach the stress concentration area and the drilling cuttings cannot accurately reflect the internal stress variation in the deep part of coal body. So, an improved drill cutting method is presented to make up for these defects. Finally, the combined monitoring method based on the improved drilling cutting method and the microseismic monitoring method is established. It not only overcomes the limitations of a single prediction method but also effectively utilizes the advantages of improved drilling cutting method and the microseismic monitoring method. And this combined monitoring method is applied to the No. 3302 coalface of Xingcun Coal Mine. The obtained results indicate that the combined monitoring method can improve the prediction capabilities of the rock burst and provide novel insights for preventing the rock burst occurrence.

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Section: The Relationship Between the Drilling Cuttings And Energymentioning

confidence: 60%

Combined Early Warning Method for Rock Burst and Its Engineering Application

Qin

Chen

et al. 2019

Advances in Civil Engineering

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“…According to (7), (8), and (9), the circumferential force of the cutting head in the horizontal direction is…”

Section: The Component Force In the Horizontal Directionmentioning

confidence: 99%

“…Boom-type roadheader is the most important equipment in the fully mechanized excavation face, mainly used for excavation of the roadway to prepare the working face for coal mining. Due to the complexity and changeableness of the occurrence condition and physical mechanical properties of coal and rock in roadway cross-section, the hardness of coal and rock during cutting process is changing constantly and randomly; therefore the cutting head load is also continuously changing during the cutting process [7][8][9][10][11][12]. The complex and changeable cutting head load, different dip angles of coal seam, and constantly changing horizontal swing angle of cutting arm cause constant change of roadheader's body pose during the horizontal cutting process, which seriously influences the positioning and orienting excavation of the roadheader and leads to reduction in forming quality and drivage efficiency of the roadway [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Multifactor Analysis of Roadheader’s Body Pose Responses during the Horizontal Cutting Process

Zong

Zhang

Wang

et al. 2018

Shock and Vibration

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Based on the Lagrange equation in system dynamics, aiming at the horizontal cutting process, the dynamical coupling model of boom-type roadheader’s body pose was established. According to input problem of solving the model, a calculation method of the cutting head load was proposed, and the relationship between the cutting head load and pressure of the driving cylinders and swing angle of the cutting arm was obtained through simulating analysis. The simulation model was established to solve the dynamical coupling model. The cutting head load, horizontal swing angle of the cutting arm, and dip angle of coal seam were regarded as independent variables to perform changing parameter analysis in variations of the body pose. The field experiment was carried out, and the measured data is basically consistent with the simulation values. The results show that lateral displacement of the body can reach up to 6.5 cm, backward displacement can reach up to 5.2 cm, floor-based quantity can reach up to 11 cm, pitch angle of the body can reach up to 7.8°, and roll angle can reach up to 2.1°. Variations of the body pose parameters are influenced greatly by the cutting head load, while the influence from horizontal swing angle of the cutting arm and dip angle of coal seam is slighter. Among the pose parameters, floor-based quantity and pitch angle of the body vary relatively greatly, which tend to seriously influence forming quality of the roadway and should be mainly considered in deviation rectification of the roadheader’s body pose.

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“…Literatures [19][20][21][22][23] obtained a stress environment to regulate the energy accumulation of the bottom plate. This technique can reduce the impact of strong pressure on the floor of the roadway, and eliminate the danger of rock burst, whereby a new "anchor-rope-net-spray concrete shell" combined support scheme is proposed for the ventilating roadway.…”

Section: Introductionmentioning

confidence: 99%

Analyzing dynamic disturbance fragmentation mechanism of surrounding rock in roadway roof

Gu¹,

Li²,

Peng³

et al. 2019

J. vibroeng.

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In this paper, a numerical simulation is conducted to analyze an engineering practice pertaining to the in panel 2347, the discussion is focused on the following aspects: the influence of fault mining activation on fragmentation of surrounding rock in roof, surrounding rock failure of unsupported roadway under static load alone, surrounding rock failure of unsupported roadway under dynamic load and static load combination, damage of surrounding rock in supporting roadway under dynamic load and static load combination. The results show that, for the roadway surrounding rock with obvious dynamic disturbance, the compressive stress value can eliminate the influence of the tensile stress wave generated by the reflection of the compressive stress disturbance wave on the roadway wall. In the roadway support, it should provide a certain compressive stress to the surrounding rock of the surrounding roadway wall. An anchor support surrounding rock can significantly inhibit the tensile crack, shear the crack expansion and dislocation slip of coal gang, and it can also alleviate the tensile, compressive and shear failure of the roof carbonaceous mudstone. Because the dynamic load has a significant damage to the carbonaceous mudstone between roof anchors, it is necessary to reduce the anchor spacing and row spacing or enhance the stiffness and active stress of the protective surface member.

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Nonlinear Dynamics Mechanism of Rock Burst Induced by the Instability of the Layer-Crack Plate Structure in the Coal Wall in Deep Coal Mining

Cited by 17 publications

References 28 publications

Combined Early Warning Method for Rock Burst and Its Engineering Application

Combined Early Warning Method for Rock Burst and Its Engineering Application

Multifactor Analysis of Roadheader’s Body Pose Responses during the Horizontal Cutting Process

Analyzing dynamic disturbance fragmentation mechanism of surrounding rock in roadway roof

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