库水位波动条件下某边坡变形特征与稳定性的颗粒流分析
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摘要
该文根据三峡库区某边坡的地质资料,利用三维颗粒流方法,反演了边坡各土层所对应的细观参数,建立了可以反映实际地质条件的颗粒流分析的三维模型,并对该边坡的应力状态进行了计算。在此基础上,研究了库水位波动条件下边坡体内的渗流状态并得到了相应的渗透力,结合强度折减法的思路,对各条件下坡体内部黏结接触破坏程度进行了比较,并利用三维颗粒流方法对边坡在库水位波动条件下的稳定性进行了分析,与极限平衡法的计算结果进行了对比,验证了分析方法的正确性,对于库区滑坡灾害的评价与防治,具有重要的意义。
In this paper,according to the geological data of a slope in the Three Gorges Reservoir Area,the meso parameters corresponding to each soil layer of the slope are retrieved by using the three-dimensional particle flow method. A three-dimensional model of particle flow analysis that can reflect the actual geological conditions is established,and the stress state of the slope is calculated. On this basis,the seepage state of slope under the condition of reservoir water level fluctuation is studied and the corresponding seepage force is obtained. Combined with the idea of strength reduction method,the degree of internal contact failure of slope under different conditions is compared. The stability of slope under the condition of reservoir water level fluctuation is analyzed by using the three-dimensional particle flow method. Compared with the results of limit equilibrium method,the correctness of the analysis method is verified. It has great significance to evaluate and prevent the landslide disaster in reservoir area.
In this paper,according to the geological data of a slope in the Three Gorges Reservoir Area,the meso parameters corresponding to each soil layer of the slope are retrieved by using the three-dimensional particle flow method. A three-dimensional model of particle flow analysis that can reflect the actual geological conditions is established,and the stress state of the slope is calculated. On this basis,the seepage state of slope under the condition of reservoir water level fluctuation is studied and the corresponding seepage force is obtained. Combined with the idea of strength reduction method,the degree of internal contact failure of slope under different conditions is compared. The stability of slope under the condition of reservoir water level fluctuation is analyzed by using the three-dimensional particle flow method. Compared with the results of limit equilibrium method,the correctness of the analysis method is verified. It has great significance to evaluate and prevent the landslide disaster in reservoir area.
引文
[1] Cundall P A,Strack O D L. A discrete numerical model for granular assemblies. Geotechnique,1979,29(1):47~65
[2]徐小敏,凌道盛,陈云敏,等.基于线性接触模型的颗粒材料细-宏观弹性常数相关关系研究.岩土工程学报,2010,32(7):991~998
[3]陈仲颐,周景星,王洪瑾.土力学.北京:清华大学出版社,1994
[4]周健,王家全,曾远,等.土坡稳定分析的颗粒流模拟.岩土力学,2009,30(1):86~90
[5]曾锃,张泽辉,杨宏丽,等.基于边坡渐进破坏特征对传统极限平衡法几点假设的合理分析.岩土力学,2012(S1)
[6]张龙,唐辉明,熊承仁,等.鸡尾山高速远程滑坡运动过程PFC~(3D)模拟.岩石力学与工程学报,2012(S1):18~28
[7] Itasca Consulting Group,Inc.. PFC3D user's manual.Minneapolis,USA:Itasca Consulting Group,Inc.,2006
[8]倪小东,王媛,陆宇光.隧洞开挖过程中渗透破坏细观机制研究.岩石力学与工程学报,2010(S2):758~765
[9]尹小涛,葛修润,李春光,等.加载速率对岩石材料力学行为的影响.岩石力学与工程学报,2010(S1):28~33
[10]丁秀丽,李耀旭.基于数字图像的土石混合体力学性质的颗粒流模拟.岩石力学与工程学报,2010,29(3):477~484
[11]孔亮,彭仁.颗粒形状对类砂土力学性质影响的颗粒流模拟.岩石力学与工程学报,2011,30(10):2112~2119
[2]徐小敏,凌道盛,陈云敏,等.基于线性接触模型的颗粒材料细-宏观弹性常数相关关系研究.岩土工程学报,2010,32(7):991~998
[3]陈仲颐,周景星,王洪瑾.土力学.北京:清华大学出版社,1994
[4]周健,王家全,曾远,等.土坡稳定分析的颗粒流模拟.岩土力学,2009,30(1):86~90
[5]曾锃,张泽辉,杨宏丽,等.基于边坡渐进破坏特征对传统极限平衡法几点假设的合理分析.岩土力学,2012(S1)
[6]张龙,唐辉明,熊承仁,等.鸡尾山高速远程滑坡运动过程PFC~(3D)模拟.岩石力学与工程学报,2012(S1):18~28
[7] Itasca Consulting Group,Inc.. PFC3D user's manual.Minneapolis,USA:Itasca Consulting Group,Inc.,2006
[8]倪小东,王媛,陆宇光.隧洞开挖过程中渗透破坏细观机制研究.岩石力学与工程学报,2010(S2):758~765
[9]尹小涛,葛修润,李春光,等.加载速率对岩石材料力学行为的影响.岩石力学与工程学报,2010(S1):28~33
[10]丁秀丽,李耀旭.基于数字图像的土石混合体力学性质的颗粒流模拟.岩石力学与工程学报,2010,29(3):477~484
[11]孔亮,彭仁.颗粒形状对类砂土力学性质影响的颗粒流模拟.岩石力学与工程学报,2011,30(10):2112~2119