Abstract
The present research primarily focuses on the investigation of gate-entry stability of longwall trial panel under weak geological condition in Indonesia coal mine by means of numerical analysis. This work aims at identifying appropriate roof support at 100 m and 150 m of depth during gate development. Due to depth depending competency of dominant rock, the stability of gate-entry at 100 m of depth can be optimized by leaving at least 1 m of remaining coal thickness (RCT) above and below the gate-entry. The appropriate support for the trial panel gate-entry is steel arch SS540 with 1 m and 0.5 m spacing for 100 m and 150 m of depth, respectively. The influence of panel excavation on gate-entry is also discussed. Regarding the aforementioned influence, the utilization of additional gate mobile support is recommended at least 10 m from the longwall face.
Highlights
The majority of coal resources in Indonesia is situated in weak geological condition region [1,2,3].This weak geological condition presents a big challenge in developing underground longwall coal mines
In order to analyze the pure influence of remaining coal thickness (RCT), gate entry is excavated without any support in the model
The of influence of remaining remaining coal thickness thickness has assessed been assessed assessed by observing observing the system
Summary
The majority of coal resources in Indonesia is situated in weak geological condition region [1,2,3].This weak geological condition presents a big challenge in developing underground longwall coal mines. The weak rock usually refers to a group of rock whose uniaxial compressive strength falls below 25MPa [4,5] This property causes the weak rock to behave totally different from hard rock corresponding to longwall mining operation in various aspects including roof caving behavior, subsidence, abutment stress distribution [6,7,8,9]. For this particular research, the stability of gate-entry is linked directly to the behavior of the abutment stress distribution. The softer the rock measure, the farther the peak stress is located from the opening
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