Abstract
There are a large amount of steeply dipping coal seams deposited in China, the safe and effective extraction of which are the challenge for coal operators due to the complicated geological characteristics, in particular, when the underground roadway is excavated in the steeply dipping coal seams with limited seam distance. The Universal Distinct Element Code (UDEC) was adopted in the present research to explore the stress distribution of surrounding rock of the roadway. Based on the numerical simulation, the damage coefficient was proposed and then used to classify the roof conditions into four groups. After that, the asymmetric support technique was proposed and put into practical applications. It is indicated that the stress concentration on the floor is the main feature of the extraction of steeply dipping coal seams. Moreover, the distributions of the maximum vertical stress and horizontal stress which are much different from each other mainly attributed to the effect of the large dip angle. This research also verified the feasibility of using the asymmetric and partition support technique to maintain the integrity of the surrounding rock, as from the case study conducted at the 12032 longwall coal face of Zhongwei coal mine.
Highlights
Geological and Mining Conditions of the Research AreaZhongwei Coal Mine, which is operated by Henan Energy and Chemical Industry Group Co., Ltd., is located in Baicheng, Xinjiang. e single-entry longwall operation is adopted to excavate the IV13 coal seam. e coal seam featured with its large dips ranging from 25° to 50°, with the average value of 35°
This paper presents a comprehensive research to obtain a better understanding on the mechanical mechanism and deformation characteristics of the surrounding rock for the roadway located in the steeply dipping coal seam
Zhongwei Coal Mine, which is operated by Henan Energy and Chemical Industry Group Co., Ltd., is located in Baicheng, Xinjiang. e single-entry longwall operation is adopted to excavate the IV13 coal seam. e coal seam featured with its large dips ranging from 25° to 50°, with the average value of 35°
Summary
Zhongwei Coal Mine, which is operated by Henan Energy and Chemical Industry Group Co., Ltd., is located in Baicheng, Xinjiang. e single-entry longwall operation is adopted to excavate the IV13 coal seam. e coal seam featured with its large dips ranging from 25° to 50°, with the average value of 35°. E single-entry longwall operation is adopted to excavate the IV13 coal seam. E coal seam featured with its large dips ranging from 25° to 50°, with the average value of 35°. Except for the large dip angle, the variable thickness of the IV13 coal seam is the other concern to be accounted for. The normal thickness of the IV13 coal seam is within 0.87 to 10.92 m, with the average thickness of 3.67 m. Note that the IV13 coal seam has to be mined separately (see Figure 1(a)). These spilt coal seams are termed as IV13a and IV13b, respectively. E 2.07 m thickness IV13b coal seam is fully excavated.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
