基于3DEC的采空区稳定性分析
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摘要
针对湖北三鑫公司金铜矿山调查采空区和变形、应力、破坏区及采空区周围的稳定性,并定位采空区的位置。根据地层信息、地质构造、采空区、溶洞、地应力测量和完整的岩石和间断界面的地质力学性能,利用3DEC软件建立三维数值模型,加载采空区周围的应力和变形条件以及岩体有限大小的连续性和相当复杂的三维地质进行了模拟。结果表明,该地区可以有拉伸或剪切的失败和高变形。在AGI实测基础上,利用3DEC数值模拟,通过预测结果与实际沉陷情况的比较,验证3DEC系统在开采沉陷预测中的适用性,证明其能较好地反映开采沉陷实际情况。
Stability conditions around mined-out areas that exist in an underground mine have a great influence on the safety,production and economic performance of the mine.The effect of mined-out areas and a natural cavity on the deformation,stress,failure zone and stability around the mined-out areas and the cavity located in a metal mine mass at the three-dimensional(3D) level were studied.The information available on stratigraphy,geological structures,mined-out areas,a natural cavity,in-situ stress measurements and geo-mechanical properties of intact rock and discontinuity interfaces have been used to build a 3D numerical model using 3DEC.The stress and deformation conditions around the mined-out areas and the cavity in the metal mine rock mass were simulated.Finite size discontinuities and fairly complex 3D geology have been simulated.3D stress analyses have been conducted under several possible material property values to study the effect of material properties on the deformation,failure zones and stability.The results show the areas which can have tensile or shear failures and also high deformations.On the basis of measured with the AGI,3DEC numerical simulation is used,by the comparison predicting the results with the actual settlement conditions,applicability of 3DEC system in the mining subsidence prediction has been verification,it proves that mining subsidence can be better reflected the actual situation.
Stability conditions around mined-out areas that exist in an underground mine have a great influence on the safety,production and economic performance of the mine.The effect of mined-out areas and a natural cavity on the deformation,stress,failure zone and stability around the mined-out areas and the cavity located in a metal mine mass at the three-dimensional(3D) level were studied.The information available on stratigraphy,geological structures,mined-out areas,a natural cavity,in-situ stress measurements and geo-mechanical properties of intact rock and discontinuity interfaces have been used to build a 3D numerical model using 3DEC.The stress and deformation conditions around the mined-out areas and the cavity in the metal mine rock mass were simulated.Finite size discontinuities and fairly complex 3D geology have been simulated.3D stress analyses have been conducted under several possible material property values to study the effect of material properties on the deformation,failure zones and stability.The results show the areas which can have tensile or shear failures and also high deformations.On the basis of measured with the AGI,3DEC numerical simulation is used,by the comparison predicting the results with the actual settlement conditions,applicability of 3DEC system in the mining subsidence prediction has been verification,it proves that mining subsidence can be better reflected the actual situation.
引文
[1]国家安全监督管理局研究中心.我国矿山采空塌陷灾害及防治对策研究[R].北京:国家安全监督管理局研究中心,2004.
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[4]李仲奎,戴荣,姜逸明.FLAC3D分析中的初始应力场生成及在大型地下洞室群计算中的应用[J].岩石力学与工程学报,2002,21(S2):2387-2392.
[5]余卫平,汪小刚,杨健,等.地下洞室群围岩稳定性分析及其结果的可视化[J].岩石力学与工程学报,2005,24(20):3730-3736.
[6]刁心宏,冯夏庭,杨成祥.岩石工程中数值模拟的关键问题及其发展[J].金属矿山,1999(6):5-7.
[7]王泳嘉,邢纪波.离散单元同拉格朗日元法及其在岩土力学中的应用[J].岩土力学,1995,16(2):1-14.
[8]朱焕春,Brummer Richard,Andrieux Patrick.节理岩体数值计算方法及其应用——方法与讨论[J].岩石力学与工程学报,2004,23(20):3444-3449.
[9]王涛,陈晓玲,于利宏.地下洞室群围岩稳定的离散元计算[J].岩土力学,2005,26(12):1936-1940.
[10]吕爱钟.试论我国岩石力学的研究状况及其进展[J].岩土力学,2004,25(9):1-9.
[2]王超凡,赵永贵,靳洪晓,等.地震CT及其在采空区探测中的应用[J].地球物理学报,1998,41(S):367-375.
[3]杨为民,陈卫忠,李术才,等.快速拉格朗日法分析巨型地下洞室群稳定性[J].岩土工程学报,2005,27(2):230-234.
[4]李仲奎,戴荣,姜逸明.FLAC3D分析中的初始应力场生成及在大型地下洞室群计算中的应用[J].岩石力学与工程学报,2002,21(S2):2387-2392.
[5]余卫平,汪小刚,杨健,等.地下洞室群围岩稳定性分析及其结果的可视化[J].岩石力学与工程学报,2005,24(20):3730-3736.
[6]刁心宏,冯夏庭,杨成祥.岩石工程中数值模拟的关键问题及其发展[J].金属矿山,1999(6):5-7.
[7]王泳嘉,邢纪波.离散单元同拉格朗日元法及其在岩土力学中的应用[J].岩土力学,1995,16(2):1-14.
[8]朱焕春,Brummer Richard,Andrieux Patrick.节理岩体数值计算方法及其应用——方法与讨论[J].岩石力学与工程学报,2004,23(20):3444-3449.
[9]王涛,陈晓玲,于利宏.地下洞室群围岩稳定的离散元计算[J].岩土力学,2005,26(12):1936-1940.
[10]吕爱钟.试论我国岩石力学的研究状况及其进展[J].岩土力学,2004,25(9):1-9.
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