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- W1964440110 abstract "In order to avoid the influence of monitoring location to measured vertical bedding separation, a new estimating approach for vertical bedding separation, which uses the ratio between current and average vertical bedding separation, λk, has been proposed. In-situ investigations showed, there exists a threshold value of λkT for any kind of roof stratum, and the sedimentation has a great influence on it. In the eastern deep coal mines, which are subjected to intense sedimentation in Shandong Province, China, λkT ranges from 1.48 to 1.73. In the western shallow coalmines, which are subjected to weak sedimentation, Inner Mongolia, China, λkT ranges from 1.32 to 1.37. λkT is related to σ′t, the lower layer thickness and separation position. When separation occurs in the anchored range, λkT increases with σ′t but in a downward gradient, and slightly decreases with the lower layer thickness. When separation occurs outside the anchored range, λkT increases with σ′t in an upward gradient, and increases with the lower layer thickness. To combine monitoring the technique for λk and the borehole camera scanning technique is a more reliable for estimating roof safety in a roadway." @default.
- W1964440110 created "2016-06-24" @default.
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- W1964440110 date "2013-07-01" @default.
- W1964440110 modified "2023-10-13" @default.
- W1964440110 title "A new approach for predicting bedding separation of roof strata in underground coalmines" @default.
- W1964440110 cites W1975055362 @default.
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- W1964440110 doi "https://doi.org/10.1016/j.ijrmms.2013.02.005" @default.
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