露天矿边坡潜在滑移面识别数值模拟
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摘要
以安家岭露天矿人工边坡为工程背景,采用岩土弹塑性理论和数值模拟软件FLAC3D,对岩质边坡潜在滑移面的分布规律开展了系统的研究。研究结果表明,人工边坡内可能存在潜在滑移面,表现为存在1个明显的剪切带;剪切带存在多个始发点——坡脚处最易发生且渐进发展,趋向于贯通,可能形成多滑移面共存状态;潜在滑移面曲线方程与抛物线拟合程度更好,结果更加可靠,得到了潜在滑移面拟合曲线方程及其临界深度方程;剪切应变增量区域范围要大于剪切带,可以看成边坡的次危险面,在外界扰动下会演化成潜在滑移面。
The artificial slope of Anjialing Open-pit Mine was taken as an engineering background and a systematic study on the distribution of potential slip surface in the rock slope was carried out by numerical simulation software FLAC3Dwith the geotechnical plastic theory. The results show that there may be potential slip surface in artificial slope,as there is an obvious shear zone; there are multiple starting points in shear zone,especially slope foot,and starting points tend to interconnect with the progressive development,then the coexistence of multiple slip surfaces may appear; the fitting degree of curve equation of potential slip surface and parabola is higher, and the fitted curve equation of potential slip and its critical depth equation is obtained; shear strain increment area is larger than shear zone as inferior dangerous surface and it may turn into a potential slip surface under external disturbance.
The artificial slope of Anjialing Open-pit Mine was taken as an engineering background and a systematic study on the distribution of potential slip surface in the rock slope was carried out by numerical simulation software FLAC3Dwith the geotechnical plastic theory. The results show that there may be potential slip surface in artificial slope,as there is an obvious shear zone; there are multiple starting points in shear zone,especially slope foot,and starting points tend to interconnect with the progressive development,then the coexistence of multiple slip surfaces may appear; the fitting degree of curve equation of potential slip surface and parabola is higher, and the fitted curve equation of potential slip and its critical depth equation is obtained; shear strain increment area is larger than shear zone as inferior dangerous surface and it may turn into a potential slip surface under external disturbance.
引文
[1]赵洪宝.坡脚扰动对工作帮整体稳定性的影响[J].金属矿山,2012(4):47-50.
[2]蔡美峰.岩石力学与工程[M].北京:科学出版社,2002:379-392.
[3]张均锋,丁桦.边坡稳定性分析的三维极限平衡法及应用[J].岩石力学与工程学报,2005,24(3):365-369.
[4]朱以文,吴春秋,蔡元奇.基于滑移线场理论的边坡滑裂面确定方法[J].岩石力学与工程学报,2005,24(15):2609-2616.
[5]杨天鸿,张锋春,于庆磊,等.露天矿高陡边坡稳定性研究现状及发展趋势[J].岩土力学,2011,32(5):1437-1444.
[6]赵洪宝,潘卫东.开挖对岩质边坡稳定性影响的数值模拟[J].金属矿山,2011(7):32-35.
[7]王庚荪,孔令伟,郭爱国.含剪切带单元模型及其在边坡渐进破坏分析中的应用[J].岩石力学与工程学报,2005(11):3852-3856.
[8]张鲁渝,郑颖人,赵尚毅,等.有限元强度折减系数法计算土坡稳定安全系数的精度研究[J].水利学报,2003(1):21-27.
[2]蔡美峰.岩石力学与工程[M].北京:科学出版社,2002:379-392.
[3]张均锋,丁桦.边坡稳定性分析的三维极限平衡法及应用[J].岩石力学与工程学报,2005,24(3):365-369.
[4]朱以文,吴春秋,蔡元奇.基于滑移线场理论的边坡滑裂面确定方法[J].岩石力学与工程学报,2005,24(15):2609-2616.
[5]杨天鸿,张锋春,于庆磊,等.露天矿高陡边坡稳定性研究现状及发展趋势[J].岩土力学,2011,32(5):1437-1444.
[6]赵洪宝,潘卫东.开挖对岩质边坡稳定性影响的数值模拟[J].金属矿山,2011(7):32-35.
[7]王庚荪,孔令伟,郭爱国.含剪切带单元模型及其在边坡渐进破坏分析中的应用[J].岩石力学与工程学报,2005(11):3852-3856.
[8]张鲁渝,郑颖人,赵尚毅,等.有限元强度折减系数法计算土坡稳定安全系数的精度研究[J].水利学报,2003(1):21-27.