Analysis of failure associated with longwall face during the main weighting period using a numerical modelling approach

Murmu, Sunny; Budi, Gnananandh

doi:10.1080/25726668.2022.2082152

Cited by 6 publications

(4 citation statements)

References 29 publications

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“…Figure 12 shows the validation of the yield zone observed in this study with the published literature. From this Figure, it can be understood that the maximum of 5 m yield zone occurred in 23 and that of 2 m minimum occurred in 18 . It is also reported that the 79.4% of face falls extended less than 1 m, 20% lies between 1 and 2 m, 0.6% lies beyond 2 m at longwall face (Face # 1306, at a depth of 637 m) of Zhaozhuang coal mine in China.…”

Section: Validation Of the Yield Zone Observed In The Numerical Analysismentioning

confidence: 78%

“…Very few studies 17 – 20 , 23 were undertaken to estimate the yield zone in the longwall face, floor and immediate roof. Figure 12 shows the validation of the yield zone observed in this study with the published literature.…”

Section: Validation Of the Yield Zone Observed In The Numerical Analysismentioning

confidence: 99%

“…Wojtecki et al 22 carried out the study for the influence zone of the failure in overlying and underlying rock from the seam under extraction using seismic hazards. Murmu and Budi 23 investigated the longwall face failure during the main weighting period by estimating six parameters such as front abutment pressure, horizontal displacement, yielding condition, cohesion, plastic shear strain and plastic tensile strain, and reported that maximum yield zone of 5 m occurred.…”

Section: Introductionmentioning

confidence: 99%

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Numerical modelling approach for estimation of a yield zone in the face of a deep longwall panel

Islavath

2023

Sci Rep

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In the Longwall mining method, the coal face is being supported with two-legged or four-legged shield supports which improve better roof control between the face and canopy tip. The development of load on the face increases with the face retreating rate or the increase of the overhung length behind the shield support and as a result, the coal face tends to yield/fail. The yield/failure zone in the face extends depending on intensity of developed load due to the depth of mining, panel size, height of excavation and geometry of the overhung. The broken coal from the yielded face may fall on the shearer, armoured flexible conveyor (AFC), shield supports or may hit the deployed manpower in the face and causes the face stoppage which in turn results in to the loss of the project. It is therefore, a study is conducted to understand the face yield/failure behaviour considering various geo-mining conditions based on input parameters such as main roof thickness, overhung length, and material type and setting load. This paper develops a unique statistical model to predict the yield/failure zone in the longwall face. For this purpose, a total of fifty-four (54) three-dimensional finite element models in ANSYS software are developed and analyzed considering Drucker-Prager failure criterion.

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Section: Validation Of the Yield Zone Observed In The Numerical Analysismentioning

confidence: 78%

Section: Validation Of the Yield Zone Observed In The Numerical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical modelling approach for estimation of a yield zone in the face of a deep longwall panel

Islavath

2023

Sci Rep

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“…3) applying the boundary condition and in situ stress; and 4) solving the model to find an equilibrium state so that excavation can start [25].…”

Section: Numerical Model Creationmentioning

confidence: 99%

Estimation of Hoek-Brown Strength Parameters from Time-Dependent Geotechnical Classification as Coal Roof Index (CRI) using Critical Plastic Strain Technique

Saran,

Gadepaka,

Jaiswal

2024

Preprint

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The roof fall or side fall is the most common type of rock failure observed particularly in underground coal mines. The numerical Method is one of the most advanced tools for the prediction of roof rock behaviour. The appropriate failure criteria play an important role in Numerical modelling. In this study, author has adopted Hoek-brown failure criteria for coal galleries using in numerical modelling. Numerical approaches take into account data from various 35 stable and failed cases of Indian coal mines. The Coal Roof Index (CRI) classification is a prime input parameter. The author first derived the range of ‘s’ parameter from the short-term stable cases (stand-up time < 90 days) and then the range of ‘m’ parameter value was refined by long term stable cases (stand-up time > 365 days). The final function of the strength parameter has been précised by consideration of all 35 cases. It has taken each of four different functions from the range of ‘m’, ‘s’, and ‘a’ parameter. Sixty-four function combinations of strength parameters have been simulated and the plastic strain value was obtained. These sixty-four combinations have been carried out based on the feedback mechanism after every combination to optimize the result and change the condition. The best-fitted curve has been established through the back analysis. It has been proposing an exponential relationship with CRI classification to estimate the Hoek-Brown strength parameters m, s, and a. The rock load height (RLH) was also observed through numerical modelling and a relationship was proposed between CRI and rock load height. The correlation coefficient for RLH vs CRI is quite impressive with R2 value of 0.84. The rock load is measured by multiplication of roof rock density and RLH. Thus, an appropriate support resistance can be calculated. The validation has been done by considering 5 Indian coal mine cases among which 2 are stable cases and 3 are unstable cases.

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Spalling Hazard Occurrence in Longwall Excavation: a Case Study

Murmu

Budi

2023

Mining, Metallurgy & Exploration

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Analysis of failure associated with longwall face during the main weighting period using a numerical modelling approach

Cited by 6 publications

References 29 publications

Numerical modelling approach for estimation of a yield zone in the face of a deep longwall panel

Numerical modelling approach for estimation of a yield zone in the face of a deep longwall panel

Estimation of Hoek-Brown Strength Parameters from Time-Dependent Geotechnical Classification as Coal Roof Index (CRI) using Critical Plastic Strain Technique

Spalling Hazard Occurrence in Longwall Excavation: a Case Study

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