Three‐Dimensional Physical Similarity Simulation of the Deformation and Failure of a Gas Extraction Surface Well in a Mining Area

Fu, Junhui; Sun, Haitao; Wen, Guangrui; Li, Rifu

doi:10.1155/2020/8834199

Cited by 7 publications

(5 citation statements)

References 18 publications

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“…The physical similarity simulations described in this research are carried out by using different ratios of sand, cement, starch and water to produce experimental filler materials that are similar to the actual production environment of a rock formation and by building the physical similarity simulation platform for coal mining using a layer-by-layer laying method (Fu et al, 2020;Zhang et al, 2020). After completing a comparable simulated rock formation, the inside material must be physically dried for a lengthy period to solidify.…”

Section: Estimation Of Time-changing Trend Of Gas Concentrationmentioning

confidence: 99%

A gas migration law study of a large-scale 3D physical similarity simulation with an adaptive Kalman filter algorithm

Hao

Zhang

2022

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Purpose In this study, a physical similarity simulation plays a significant role in the study of crack evolution and the gas migration mechanism. A sensor is deployed inside a comparable artificial rock formation to assure the accuracy of the experiment results. During the building of the simulated rock formation, a huge volume of acidic gas is released, causing numerous sensor measurement mistakes. Additionally, the gas concentration estimation approach is subject to uncertainty because of the complex rock formation environment. As a result, the purpose of this study is to introduce an adaptive Kalman filter approach to reduce observation noise, increase the accuracy of the gas concentration estimation model and, finally, determine the gas migration law. Design/methodology/approach First, based on the process of gas floatation-diffusion and seepage, the gas migration model is established according to Fick’s second law, and a simplified modeling method using diffusion flux instead of gas concentration is presented. Second, an adaptive Kalman filter algorithm is introduced to establish a gas concentration estimation model, taking into account the model uncertainty and the unknown measurement noise. Finally, according to a large-scale physical similarity simulation platform, a thorough experiment about gas migration is carried out to extract gas concentration variation data with certain ventilation techniques and to create a gas chart of the time-changing trend. Findings This approach is used to determine the changing process of gas distribution for a certain ventilation mode. The results match the rock fissure distribution condition derived from the microseismic monitoring data, proving the effectiveness of the approach. Originality/value For the first time in large-scale three-dimensional physical similarity simulations, the adaptive Kalman filter data processing method based on the inverse Wishart probability density function is used to solve the problem of an inaccurate process and measurement noise, laying the groundwork for studying the gas migration law and determining the gas migration mechanism.

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Section: Estimation Of Time-changing Trend Of Gas Concentrationmentioning

confidence: 99%

A gas migration law study of a large-scale 3D physical similarity simulation with an adaptive Kalman filter algorithm

Hao

Zhang

2022

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“…France utilized an experimental method to study the failure characteristics of the surrounding rock, pointing out that the principal stress on the well wall has an important effect on the well stability (Chi, Zhang et al 2019, Ju, Wang et al 2019, Zhang, Bai et al 2021. The quantitative relationship between the geological well failure characteristics and the geostress, initially obtaining the relationship among different geostress and deformations of the ground drills (Fu, Sun et al 2020, Luan, Dong et al 2020, Sun, Xu et al 2022.…”

Section: Introductionmentioning

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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“…In order to reasonably and correctly estimate the pressure law and mineral pressure behavior of the roof, a physical simulation experiment was used to study the working surface mining pressure, roof movement, and roofing law [24]. Deformation failure of surface wells in mining areas is a key problem faced by surface well gas extraction technology, and based on three-dimensional physical similarity simulation and key layer theory, the deformation and failure of surface wells of different materials under the influence of the movement of mining rock mass were analyzed [25]. In terms of new materials, relying on the field exploration data of the Qingdao Jiaozhou Bay undersea tunnel, a new flow-solid coupled similar material (SCVO) consisting of sand, barite powder, talcum powder, cement, petroleum jelly, silicone oil, and the appropriate amount of mixing water, was developed by applying the flow-solid coupled similar theory of geomechanical model test [26].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Ratio Optimization of Similar Materials for Underground Mining of Shendong Coalfield: A Case Study of Shangwan Coal Mine

et al. 2023

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Physical simulation is one of the effective methods to study mining problems, but the selection and proportion of simulation materials are greatly affected by the regional environment. This paper is based on a multilevel orthogonal design test scheme using sand, lime, and gypsum as the materials in the Shangwan coal mine in the Shendong coalfield, with the sand to cement ratio, paste to ash ratio, and maintenance days as variables. The effect of the polar difference method on the strength and density of gypsum was used as a reference for physical simulation in the Shendong coalfield. The sensitivity analysis of each factor was carried out by the polar difference method, and the influencing factors on density were, in descending order, sand to mortar ratio, mortar to ash ratio, and the number of maintenance days; the influencing factors on strength were, in descending order, mortar to ash ratio, maintenance days, and sand to mortar ratio. The sand cement ratio was negatively correlated with strength and density, the paste to ash ratio was positively correlated with strength and density, and the number of maintenance days was positively correlated with strength and negatively correlated with density. The multivariate non-linear regression analysis of sand to cement ratio and paste to ash ratio identified similar material proportioning test equations for the Shendong coalfield, which can improve the accuracy of physical simulation and be used to guide physical simulation experiments in the Shendong coalfield.

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Three‐Dimensional Physical Similarity Simulation of the Deformation and Failure of a Gas Extraction Surface Well in a Mining Area

Cited by 7 publications

References 18 publications

A gas migration law study of a large-scale 3D physical similarity simulation with an adaptive Kalman filter algorithm

A gas migration law study of a large-scale 3D physical similarity simulation with an adaptive Kalman filter algorithm

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

Experimental Study on Ratio Optimization of Similar Materials for Underground Mining of Shendong Coalfield: A Case Study of Shangwan Coal Mine

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