强地震荷载作用下含断层岩质边坡稳定性分析
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摘要
基于岩石材料的弹塑性损伤理论,引入两个独立的损伤变量分别控制岩石的拉压行为,通过对地震荷载作用下边坡场地响应的有限无数值模拟,总结含裂隙的岩质边坡发生局部损伤软化、破坏的区域的扩展、演化过程和规律.结合对某大型水电坝坝址左岸的岩质边坡在强地震动载荷作用下(百年一遇、超越概率2%)发生破坏的数值模拟,揭示这类边坡滑坡的机理,并根据模拟的结果,对整治边坡破坏提出参考依据.
Based on elasto-plastic damage theory of rock materials,the failure and fracture processes of rock slopes are numerically simulated with the site response of the rock slope under strong seismic loading,including the local damage evolution and the development of failure area.Two independent damage variables are introduced into the constitutive model to control the tension and compression behaviors of the rock materials. Although the characteristics of initial micro-cracks inherent in the rock materials are not considered in the constitutive model,their influence on the properties of rock materials is taken into consideration by reducing the corresponding moduli and strength.The interfacial characteristics between large cracks such as faults are considered as in the interface contact.The numerical simulation by finite element method is carried out for the failure of a practical rock slope on the left bank of a river with a large hydraulic power station under a strong seismic loading(in 100-year recurrent period and over a probability of 2%).The mechanism of landslide for such kind of fractured rock slope is analyzed.Some advices are proposed for prevention and treatment of the landslide according to the simulation results.
Based on elasto-plastic damage theory of rock materials,the failure and fracture processes of rock slopes are numerically simulated with the site response of the rock slope under strong seismic loading,including the local damage evolution and the development of failure area.Two independent damage variables are introduced into the constitutive model to control the tension and compression behaviors of the rock materials. Although the characteristics of initial micro-cracks inherent in the rock materials are not considered in the constitutive model,their influence on the properties of rock materials is taken into consideration by reducing the corresponding moduli and strength.The interfacial characteristics between large cracks such as faults are considered as in the interface contact.The numerical simulation by finite element method is carried out for the failure of a practical rock slope on the left bank of a river with a large hydraulic power station under a strong seismic loading(in 100-year recurrent period and over a probability of 2%).The mechanism of landslide for such kind of fractured rock slope is analyzed.Some advices are proposed for prevention and treatment of the landslide according to the simulation results.
引文
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12 Zhang Junfeng,Qi Tao.3D Anisotropic elastoplasticdamage model and its application in simulating the behavior of rock materials.Key Engineering Materials,2006, 324-325:579-582
13张均锋,祁涛,李正国.岩石材料的三维各向异性损伤破坏模型与数值模拟.岩土力学,2006,27(增):27-30(Zhang Junfeng, Qi Tao,Li Zhengguo.A three-dimensional anisotropic damage model of rock materials and its numerical simulating application.Rock and Soil Mechanics,2006,27(Supp.): 27-30(in Chinese))
2黄理兴,陈奕柏.我国岩石动力学研究状况与发展.岩石力学与工程学报,2003,22(11):1881-1886(Huang Lixing,Chen Yibai.Rock dynamics in China:past,present and future. Chinese Journal of Rock Mechanics and Engineering,2003, 22(11):1881-1886(in Chinese))
3李海波,蒋会军,赵坚等.动荷载作用下岩体工程安全的几个问题.岩石力学与工程学报,2003,22(11):1887-1891(Li Haibo,Jiang Huijun,Zhao Jian,etc.About safety analysis of rock engineering.Journal of Rock Mechanics and Engineering under Dynamic Load,2003,22(11):1887-1891 (in Chinese))
4 Newmark NM.Effects of earthquakes on dams and embankments. Geotechnique,1965,15(2):139-160
5 Clough RW,Chopra AK.Earthquake stress analysis in earth dams.Journal of the Engineering Mechanics,1966, 92(EM2):197-211
6 Ito H,Sato K,Sawada Y.Consideration on the seismic motion and the design seismic coefficient of large cut slope under the strong earthquake.In:International Congress on Rock Mechanics.Japan,1995.413-416
7何蕴龙,陆述远.岩石边坡地震作用近似计算方法.岩土工程学报,1998,20(2):66-68(He Yunlong,Lu Shuyuan. A method for calculating the seismic action rock slope. Chinese Journal of Geotechnical Engineering,1998,20(2): 66-68(in Chinese))
8 Dougil JW,et al.Mechanics in Engineering.ASCE,EMD, 1976.333-355
9 Dragon A,Morz Z.A continuum model for plastic-brittle behavior of rock and concrete.Int J Engineering Sciences, 1979,17(2):121-137
10 Krajcinovic D,Fonseka GU.The continuous damage theory of brittle materials.J Appl Mech,1981,48(4):809-815
11谢和平著.岩石、混凝土损伤力学.徐州:中国矿业大学出版社, 1990
12 Zhang Junfeng,Qi Tao.3D Anisotropic elastoplasticdamage model and its application in simulating the behavior of rock materials.Key Engineering Materials,2006, 324-325:579-582
13张均锋,祁涛,李正国.岩石材料的三维各向异性损伤破坏模型与数值模拟.岩土力学,2006,27(增):27-30(Zhang Junfeng, Qi Tao,Li Zhengguo.A three-dimensional anisotropic damage model of rock materials and its numerical simulating application.Rock and Soil Mechanics,2006,27(Supp.): 27-30(in Chinese))
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