HAN Yufeng,WANG Zhaohui,TANG Yuesong. Influence of support stiffness on face stability in longwall face with large cutting height[J]. Coal Science and Technology,2023,51(3):1−9
. DOI: 10.13199/j.cnki.cst.2020-1283Citation: |
HAN Yufeng,WANG Zhaohui,TANG Yuesong. Influence of support stiffness on face stability in longwall face with large cutting height[J]. Coal Science and Technology,2023,51(3):1−9 . DOI: 10.13199/j.cnki.cst.2020-1283 |
Longwall mining with large cutting height serves as one of main methods for extracting thick coal seam. Face failure gradually becomes a critical phenomenon due to significant increase of the cutting height, which drastically influences the mining efficiency in such longwall faces. In order to improve surrounding rock stability and mining efficiency of such faces, the influence of support stiffness on face stability is thoroughly investigated by using theoretical analysis, laboratory testing and field measurements. The results show that three kinds of face failure patterns commonly appear in longwall face with large cutting height, including splitting pattern of hard coal seam, shearing pattern of relatively hard coal seam and plastic flow pattern in soft coal seam. A safety factor is proposed for longwall face, which is defined as the ratio of the difference between load-bearing capacity of the face and roof load applied on the face to the referred roof load. The influence of roof load on distribution of the safety factor is obtained. A model is developed for roof impact phenomenon, determination method of the load exerting on the face by roof is deduced. The relation between support stiffness and face stability coefficient is achieved. With the increase in support stiffness, the load applied on the face decreases and the face stability is strengthened. However, the sensitivity of the load and face stability to support stiffness decreases gradually. Physical modeling of the influence provided by support stiffness on face stability is carried out. With the support stiffness of 1.0, 1.5 and 2.0 MN/m, load-bearing capacity of the face increases from 17 to 19 and then to 20 kN. The largest horizontal displacement decreases from 40 to 30 and then to 25 mm. After failure, the broken areas are about 0.41, 0.32 and 0.21 m2, respectively, in the referred scenarios. At last, the face stability of 31402 longwall face in Wulanmulun coal mine is effectively improved by increasing the support stiffness.
[1] |
王家臣. 极软厚煤层煤壁片帮与防治机理[J]. 煤炭学报,2007,32(8):785−788. doi: 10.3321/j.issn:0253-9993.2007.08.001
WANG Jiachen. Mechanism of the rib spalling and the controlling in the very soft coal seam[J]. Journal of China Coal Society,2007,32(8):785−788. doi: 10.3321/j.issn:0253-9993.2007.08.001
|
[2] |
李春元,张 勇,张国军,等. 深部开采动力扰动下底板应力演化及裂隙扩展机制[J]. 岩土工程学报,2018,40(11):2031−2040.
LI Chunyuan,ZHANG Yong,ZHANG Guojun,et al. Crack propagation mechanisms and stress evolution of floor under dynamic disturbance in deep coal mining[J]. Chinese Journal of Geotechnical Engineering,2018,40(11):2031−2040.
|
[3] |
尹希文,闫少宏,安 宇. 大采高综采面煤壁片帮特征分析与应用[J]. 采矿与安全工程学报,2008,25(2):222−225. doi: 10.3969/j.issn.1673-3363.2008.02.021
YIN Xiwen,YAN Shaohong,AN Yu. Characters of the rib spalling in fully mechanized caving face with great mining height[J]. Journal of Mining and Safety Engineering,2008,25(2):222−225. doi: 10.3969/j.issn.1673-3363.2008.02.021
|
[4] |
方新秋,何 杰,李海潮. 软煤综放面煤壁片帮机理及防治研究[J]. 中国矿业大学学报,2009,38(5):640−644. doi: 10.3321/j.issn:1000-1964.2009.05.007
FANG Xinqiu,HE Jie,LI Haichao. A study of the rib fall mechanism in soft coal and its control at a fully-mechanized top-coal caving face[J]. Journal of China University of Mining and Technology,2009,38(5):640−644. doi: 10.3321/j.issn:1000-1964.2009.05.007
|
[5] |
袁 永,屠世浩,马小涛,等. “三软”大采高综采面煤壁稳定性及其控制研究[J]. 采矿与安全工程学报,2012,29(1):21−25. doi: 10.3969/j.issn.1673-3363.2012.01.004
YUAN Yong,TU Shihao,MA Xiaotao,et al. Coal wall stability of fully mechanized working face with great mining height in “three soft” coal seam and its control technology[J]. Journal of Mining and Safety Engineering,2012,29(1):21−25. doi: 10.3969/j.issn.1673-3363.2012.01.004
|
[6] |
杨培举,刘长友,吴锋锋. 厚煤层大采高采场煤壁的破坏规律与失稳机理[J]. 中国矿业大学学报,2012,41(3):371−377.
YANG Peiju,LIU Changyou,WU Fengfeng. Breakage and falling of a high coal wall in a thick mined seam[J]. Journal of China University of Mining and Technology,2012,41(3):371−377.
|
[7] |
王兆会,杨敬虎,孟 浩. 大采高工作面过断层构造煤壁片帮机理及控制[J]. 煤炭学报,2015,40(1):42−49. doi: 10.13225/j.cnki.jccs.2014.0098
WANG Zhaohui,YANG Jinghu,MENG Hao. Mechanism and controlling technology of rib spalling in mining face with large cutting height passing through fault[J]. Journal of China Coal Society,2015,40(1):42−49. doi: 10.13225/j.cnki.jccs.2014.0098
|
[8] |
王家臣,王兆会,孔德中. 硬煤工作面煤壁破坏与防治机理[J]. 煤炭学报,2015,40(10):2243−2250. doi: 10.13225/j.cnki.jccs.2015.6013
WANG Jiachen,WANG Zhaohui,KONG Dezhong. Failure and prevention mechanism of coal wall in hard coal seam[J]. Journal of China Coal Society,2015,40(10):2243−2250. doi: 10.13225/j.cnki.jccs.2015.6013
|
[9] |
王家臣,王 蕾,郭 尧. 基于顶板与煤壁控制的支架阻力的确定[J]. 煤炭学报,2014,39(8):1619−1624. doi: 10.13225/j.cnki.jccs.2014.9027
WANG Jiachen,WANG Lei,GUO Yao. Determining the support capacity based on roof and coal wall control[J]. Journal of China Coal Society,2014,39(8):1619−1624. doi: 10.13225/j.cnki.jccs.2014.9027
|
[10] |
王兆会,王家臣,杨 毅,等. 综采工作面煤壁稳定性的支架刚度效应分析[J]. 中国矿业大学学报,2019,48(2):258−267. doi: 10.13247/j.cnki.jcumt.000980
WANG Zhaohui,WANG Jiachen,YANG Yi,et al. Mechanical relation between support stiffness and face stability within fully mechanized mining faces[J]. Journal of China University of Mining and Technology,2019,48(2):258−267. doi: 10.13247/j.cnki.jcumt.000980
|
[11] |
杨胜利,孔德中. 大采高煤壁片帮防治柔性加固机理与应用[J]. 煤炭学报,2015,40(6):1361−1367. doi: 10.13225/j.cnki.jccs.2015.0271
YANG Shengli,KONG Dezhong. Flexible reinforcement mechanism and its application in the control of spalling at large mining height coal face[J]. Journal of China Coal Society,2015,40(6):1361−1367. doi: 10.13225/j.cnki.jccs.2015.0271
|
[12] |
王家臣,杨印朝,孔德中,等. 含夹矸厚煤层大采高仰采煤壁破坏机理与注浆加固技术[J]. 采矿与安全工程学报,2014,31(6):831−837. doi: 10.13545/j.issn1673-3363.2014.06.001
WANG Jiachen,YANG Yinchao,KONG Dezhong,et al. Failure mechanism and grouting reinforcement technique of large mining height coal wall in thick coal seam with dirt band during topple mining[J]. Journal of Mining and Safety Engineering,2014,31(6):831−837. doi: 10.13545/j.issn1673-3363.2014.06.001
|
[13] |
杨胜利,孔德中,杨敬虎,等. 综放仰斜开采煤壁稳定性及注浆加固技术[J]. 采矿与安全工程学报,2015,32(5):827−833. doi: 10.13545/j.cnki.jmse.2015.05.020
YANG Shengli,KONG Dezhong,YANG Jinghu,et al. Coal wall stability and grouting reinforcement technique in fully mechanized caving face during topple mining[J]. Journal of Mining and Safety Engineering,2015,32(5):827−833. doi: 10.13545/j.cnki.jmse.2015.05.020
|
[14] |
杨登峰,陈忠辉,朱帝杰,等. 基于顶板切落的浅埋煤层开采支架工作阻力研究[J]. 岩土工程学报,2016,38(S2):286−292. doi: 10.11779/CJGE2016S2047
YANG Denghui,CHEN Zhonghui,ZHU Dijie,et al. Support capacity at roof cutting in mining of shallow coal seam[J]. Chinese Journal of Geotechnical Engineering,2016,38(S2):286−292. doi: 10.11779/CJGE2016S2047
|
[15] |
宋高峰,杨胜利,王兆会. 基于利兹法的煤壁破坏机理分析及三维相似模拟试验研究[J]. 煤炭学报,2018,43(8):2162−2172. doi: 10.13225/j.cnki.jccs.2017.1301
SONG Gaofen,YANG Shengli,WANG Zhaohui. Longwall face stability analysis using Ritz method and its 3D physical modelling study[J]. Journal of China Coal Society,2018,43(8):2162−2172. doi: 10.13225/j.cnki.jccs.2017.1301
|
[16] |
弓培林,靳钟铭. 大采高综采采场顶板控制力学模型研究[J]. 岩石力学与工程学报,2008,27(1):193−198. doi: 10.3321/j.issn:1000-6915.2008.01.027
GONG Peilin,JIN Zhongming. Mechanical model study on roof control for fully-mechanized coal face with large mining height[J]. Journal of Mining and Safety Engineering,2008,27(1):193−198. doi: 10.3321/j.issn:1000-6915.2008.01.027
|
[17] |
杨胜利,王兆会,蒋 威,等. 高强度开采工作面煤岩灾变的推进速度效应分析[J]. 煤炭学报,2016,41(3):586−594. doi: 10.13225/j.cnki.jccs.2015.1944
YANG Shengli,WANG Zhaohui,JIANG Wei,et al. Advancing rate effect on rock and coal failure format in high-intensity mining face[J]. Journal of China Coal Society,2016,41(3):586−594. doi: 10.13225/j.cnki.jccs.2015.1944
|
[18] |
王家臣,王兆会. 高强度开采工作面顶板动载冲击效应分析[J]. 岩石力学与工程学报,2015,34(S2):3987−3997. doi: 10.13722/j.cnki.jrme.2014.1148
WANG Jiachen,WANG Zhaohui. Impact effect of dynamic load induced by roof in high-intensity mining face[J]. Chinese Journal of Rock Mechanics and Engineering,2015,34(S2):3987−3997. doi: 10.13722/j.cnki.jrme.2014.1148
|
1. |
王毅,马壮,王宏涛,白宇,王柯,陈伟. 巨厚含水层下厚煤层综放开采覆岩破坏规律与涌(突)水危险性研究. 煤炭技术. 2025(04): 130-137 .
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