Study on influence of compression characteristics ofsuper-thick alluvium on mining subsidence

doi:10.16265/j.cnki.issn1003-3033.2018.07.022

Abstract

Abstract: In order to study the compression characteristics of super-thick alluvium and its influence on mining subsidence,triaxial compression tests were conducted on the surface cohesive soil in Jiaozuo mining area.Based on the experimental results,a numerical simulation of the mining subsidence of a certain working face under super-thick alluvium was performed.Mechanism of surface subsidence under super-thick alluvium was also analyzed theoretically.The results show that there is a compression phenomenon in alluvium and the compression amount increases with the increase of the thickness of alluvium,resulting in an increase in surface subsidence,and that the self-compression characteristics of the alluvium are the main factor resulting the large subsidence of surface when mining under super-thick alluvium.

Key words: super-thick alluvium, soil compression characteristics, mining subsidence, triaxial compression test, numerical simulation

CLC Number:

X936

LI Xinling, GUO Wenbing, ZHAO Gaobo. Study on influence of compression characteristics ofsuper-thick alluvium on mining subsidence[J]. China Safety Science Journal, 2018, 28(7): 135-141.

References

[1] 刘义新,戴华阳,姜耀东.厚松散层矿区采动岩土体移动规律模拟试验研究[J].采矿与安全工程学报,2012,29(5):700-706.
LIU Yixin,DAI Huayang,JIANG Yaodong.Model test for mining-induced movement law of rock and soil mass under thick unconsolidated layers[J].Journal of Mining & Safety Engineering,2012,29(5):700-706.
[2] 王金庄,常占强,陈勇.厚松散层条件下开采程度及地表下沉模式的研究[J].煤炭学报,2003,28(3):230-234.
WANG Jinzhuang,CHANG Zhanqiang,CHEN Yong.Study on mining degree and surface subsidence model under the condition of thick loose layer[J].Journal of China Coal Society,2003,28(3):230-234.
[3] GUO Wenbing,XU Feiya.Numerical simulation of overburden and surface movements for Wongawilli strip pillar mining[J].International Journal of Mining Science and Technology,2016,26(1):71-76.
[4] 张文泉,刘海林,赵凯.厚松散层薄基岩条带开采地表沉陷影响因素研究[J].采矿与安全工程学报,2016,33(6):1 065-1 071.
ZHANG Wenquan,LIU Hailin,ZHAO Kai.Influential factors on surface subsidence in stripe mining under thick unconsolidated layers and thin bedrock[J].Journal of Mining & Safety Engineering,2016,33(6):1 065-1 071.
[5] 陈才贤,苏静,赵忠义.巨厚松散层下煤层开采地表移动规律研究[J].煤矿开采,2017,22(3):59-61,77.
CHEN Caixian,SU Jing,ZHAO Zhongyi.Study of surface movement principle of coal seam mining under super thick unconsolidated stratum[J].Coal Mining Technology,2017,22(3):59-61,77.
[6] GUO Wenbing,BAI Erhu,TAN Yi,et al.Surface movement characteristics caused by fully-mechanized top coal caving mining under thick collapsible loess[J].Electronic Journal of Geotechnical Engineering,2017,22(3):1 107-1 116.
[7] 陈俊杰,陈勇,郭文兵,等.厚松散层开采条件下地表移动规律研究[J].煤炭科学技术,2013,41(11):95-97,102.
CHEN Junjie,CHEN Yong,GUO Wenbing,et al.Study on surface movement law under the condition of thick unconsolidated strata[J].Coal Science and Technology,2013,41(11):95-97,102.
[8] 刘义新,戴华阳,郭文兵.巨厚松散层下深部宽条带开采地表移动规律[J].采矿与安全工程学报,2009,26(3):336-340.
LIU Yixin,DAI Huayang,GUO Wenbing.Surface movement laws of deep wide strip-pillar mining under thick alluvium[J].Journal of Mining & Safety Engineering,2009,26(3):336-340.
[9] 孙闯,徐乃忠,刘义新,等.基于双因素时间函数的松散地层条件下地表点动态沉降预计[J].岩土力学,2017,38(3):821-826,865.
SUN Chuang,XU Naizhong,LIU Yixin,et al.Prediction of dynamic subsidence of ground point under loose stratum based on two-factor time function[J].Rock and Soil Mechanics,2017,38(3):821-826,865.
[10] 左建平,孙运江,钱鸣高.厚松散层覆岩移动机理及“类双曲线”模型[J].煤炭学报,2017,42(6):1 372-1 379.
ZUO Jianping,SUN Yunjiang,QIAN Minggao.Movement mechanism and analogous hyperbola model of overlying strata with thick alluvium[J].Journal of China Coal Society,2017,42(6):1 372-1 379.
[11] 赵高博,郭文兵,杨达明,等.综放开采覆岩破坏模型及导水裂隙带高度研究[J].中国安全科学学报,2017,27(11):144-149.
ZHAO Gaobo,GUO Wenbing,YANG Daming,et al.Study on overburden failure models and height of water flowing fractured zone in fully mechanized caving mining[J].China Safety Science Journal,2017,27(11):144-149.
[12] 周大伟.煤矿开采沉陷中岩土体的协同机理及预测[D].徐州:中国矿业大学,2014.
ZHOU Dawei.The synergy mechanism between rock mass and soil in mining subsidence and its prediction[D].Xuzhou:China University of Mining & Technology,2014.
[13] ZHOU Dawei,WU Kan,CHEN Gonglin.et al.Mechanism of mining subsidence in coal mining area with thick alluvium soil in China[J].Arabian Journal of Geosciences,2015,8(4):1 855-1 867.
[14] 赵高博,郭文兵,娄高中,等.厚松散层高强度开采岩层与地表移动模拟[J].中国安全科学学报,2018,28(1):130-136.
ZHAO Gaobo,GUO Wenbing,LOU Gaozhong,et al.Numerical simulation of movement of both rock mass and surface under thick loose layer high-intensity mining condition[J].China Safety Science Journal,2018,28(1):130-136.
[15] 陈磊.巨厚冲积层薄基岩下开采地表移动规律研究[D].焦作:河南理工大学,2011.
CHEN Lei.Study on surface movement by mining under thick alluvium and thin bedrock[D].Jiaozuo:Henan Polytechnic University,2011.
[16] 顾伟.厚松散层下开采覆岩及地表移动规律研究[D].徐州:中国矿业大学,2013.
GU Wei.Study on laws of overburden and surface movement when mining under thick alluvium[D].Xuzhou:China University of Mining & Technology,2013.