震动作用下采空区上方地基稳定性
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摘要
为深入探讨废弃采空区在震动作用下二次活化机理及其变形破坏规律,通过数值模拟的方法分别探讨煤层开挖相对稳定后,上覆围岩跨落变形后无离层和存在离层两种情况在地震波的作用下,废弃采空区上覆围岩但稳定性.模拟结果表明:采空区在经过地震作用下,上覆岩层应力发生了重新分布.在采空区两边界出现应力集中现象.离层模型在应力和位移上明显比无离层模型要大的多,说明废弃采空区离层上覆岩层受到地震力扰动后更容易发生"活化",但离层模型和无离层模型在地震波作用下各观测点的应力值随时间变化而变化其动应力时程表现为波动曲线其波动周期与输入加速度的周期一致,顶板动应力来说其的分布规律与重力静力作用下的应力分布规律具有很多相似之处.
In order to discuss the secondary activation mechanism and the regular pattern of deformation and failure of abandoned goafs under the actions of earthquakes,this paper,by means of the numerical simulations,studied the stability of overlying rock after reaching the excavation relatively stable condition under the action of seismic wave.The simulation results show that the overburden stress redistribution happened after the earthquake and the stress concentration phenomenon occurred in the two boundaries of mined-out areas.The stress and displacement of delamination model is more obvious than that of the no delamination model,which explains that the overlying rock of abandoned goafs are more likely to have the "activation" under seismic force;but no delaminating of the abscission layer model and the model under the action of seismic wave stress value of each observation point changes over time,and the dynamic stress time history of volatility curve and the cycle is consistent with the input acceleration period.The dynamic stress distribution of roof and the static stress distribution law under the action of gravity have many similarities.
In order to discuss the secondary activation mechanism and the regular pattern of deformation and failure of abandoned goafs under the actions of earthquakes,this paper,by means of the numerical simulations,studied the stability of overlying rock after reaching the excavation relatively stable condition under the action of seismic wave.The simulation results show that the overburden stress redistribution happened after the earthquake and the stress concentration phenomenon occurred in the two boundaries of mined-out areas.The stress and displacement of delamination model is more obvious than that of the no delamination model,which explains that the overlying rock of abandoned goafs are more likely to have the "activation" under seismic force;but no delaminating of the abscission layer model and the model under the action of seismic wave stress value of each observation point changes over time,and the dynamic stress time history of volatility curve and the cycle is consistent with the input acceleration period.The dynamic stress distribution of roof and the static stress distribution law under the action of gravity have many similarities.
引文
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[2]郭广礼,张国信,刘丙方.地面荷载对地下采空区的临界扰动深度及其影响[J].矿山压力与顶板管理,2004,21(1):72-77.Guo Guangli,Zhang Guoxin,Liu Bingfang.The influence of surface loadto critical affection depth in goaf[J].Ground Pressure and Strata Control,2004,21(1):72-77.
[3]常江.老采空区上方建筑物地基稳定性的研究[J].西安矿业学院学报,1995,15(1):29-33.Chang Jiang.Research on the stability of structure foundation on theground above old mine goafs[J].Journal of Xi.an University of Scienceand Technology,1995,15(1):29-33.
[4]乔志春,夏军武,郭广礼,等.老采空区上方大型工业建筑抗变形措施研究[J].中国矿业大学学报,1999,28(6):593-596.Qiao Zhi chun,Xia Junwu,Guo Guangli,et al.Study on ant-i deformationmeasures for heavy industrial buildings over abandoned mine goafs[J].Journal of China University of Mining&Technology,1999,28(6):593-596.
[5]邱贤德,黄木坤,王心飞,等.数值计算在采空区稳定性评价中的应用[J].矿山压力与顶板管理,2002(4):105-110.Qiu Xiande,Huang Mukun,Wang Xinfei,et al.Application of numericalcalculation method in evaluating the stope stability of ore body[J].Ground Pressure and Strata Control,2002(4):105-110.
[6]吴兆营,薄景山,杜国林,等.采空区对地表稳定性的影响[J].自然灾害学报,2004,13(2):140-144.Wu Zhaoying,Bo Jingshan,Du Guolin,et al.Effects of mining excavationon ground stability[J].Journal of Natural Disasters,2004,13(2):140-144.
[7]张建全,于友江.岩层移动动态过程的离散单元法分析[J].水文地质工程地质,2004(2):9-13.Zhang Jianquan,Yu Youjiang.Discrete elementmethod for rock movementanalysis[J].Hydrogeology&Engineering Geology,2004(2):9-13.
[8]唐辉明,晏鄂川,胡新丽.工程地质数值模拟的理论与方法[M].武汉:中国地质大学出版社,2001.Tan Huiming,Yan Ezhou,Hu Xinli.Numerical Simulation Theory andMethod of Engineering Geology[M].Wuhan:China University ofGeosciences Press,2001.
[9]武强,王龙,魏学勇,等.榆神府矿区大柳塔井田煤层群采地面沉陷可视化数值模拟[J].水文地质工程地质,2003(6):37-39.Wu Qiang,Wang Long,Wei Xueyong,et al.Visual numeric simulation ofsubsidence in Daliuta mine of Yushenfu[J].Hydrogeology&EngineeringGeology,2003(6):37-39.
[10]谢和平,周宏伟,王金安,等.FLAC3D在煤矿开采沉陷预测中的应用及对比分析[J].岩石力学与工程学报,1999,18(4):397-401.Xie Heping,Zhou Hongwei,Wang Jinan,et al.Application andcontrasting analysis of FLAC3D in prediction subsidence of coalmining[J].Chinese Journal of Rock Mechanics and Engineering,1999,18(4):397-401.
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