地震动力作用触发的斜坡崩滑响应研究——以青川东河口滑坡为例
摘要
同时考虑水平、竖向加速度和两者之间时差对斜坡体破坏作用的研究较少见.运用UDEC对青川东河口斜坡体在具地域性和空间非均质性的地震纵横波时差耦合作用下产生损伤和崩滑破坏的全过程进行了模拟,确定了该斜坡体在水平和竖向地震力作用下产生崩滑破坏的成灾机制及主控因素.结果表明:在输入地震动力条件7~10 s内,坡体后缘形成动力损伤并完全开裂,而横波由于传输速度较慢在26 s时才到达斜坡体,故坡体初期崩滑破坏是受到源自初始震源的纵波产生的水平拉裂作用所致,而后期的抛射和碎屑流动则是受到纵横波耦合作用所致;此外,纵波产生的水平拉裂作用是触发斜坡体产生初期崩滑破坏的主控因素,而斜坡所处地形则是促使其开裂后形成后续碰撞解体、碎屑流动和堆积等运动过程的主控因素.
Study of slope response triggered by action of horizontal and vertical seismic acceleration and their time difference seldom appears.Collapsing and sliding response of Donghekou slope in Qingchuan County and its running out process triggered by single and combined action with time difference,regionality and spatial heterogeneity of horizontal and vertical seismic loads generated by P and S seismic waves is simulated by applying UDEC software;and formation mechanism and key controlling factors of slope collapsing and sliding process are confirmed.The result shows that initial collapsing and sliding of the slope is triggered by horizontal tension action caused by P seismic wave from initial focus for the reason that slope damage and full fracture appears within 7-10s after P seismic wave arriving;but S seismic wave arriving affer 26s because of its lower speed.On the other hand,ejecting and flowing of the broken slope mass is triggered by combined action of P and S seismic waves.In addition,horizontal tension action of P wave is the key controlling factor inducing the slope collapsing and sliding,nevertheless slope topography is the key controlling factor leading to collision,debris flow and accumulation of the slope mass fractured in latter process.
Study of slope response triggered by action of horizontal and vertical seismic acceleration and their time difference seldom appears.Collapsing and sliding response of Donghekou slope in Qingchuan County and its running out process triggered by single and combined action with time difference,regionality and spatial heterogeneity of horizontal and vertical seismic loads generated by P and S seismic waves is simulated by applying UDEC software;and formation mechanism and key controlling factors of slope collapsing and sliding process are confirmed.The result shows that initial collapsing and sliding of the slope is triggered by horizontal tension action caused by P seismic wave from initial focus for the reason that slope damage and full fracture appears within 7-10s after P seismic wave arriving;but S seismic wave arriving affer 26s because of its lower speed.On the other hand,ejecting and flowing of the broken slope mass is triggered by combined action of P and S seismic waves.In addition,horizontal tension action of P wave is the key controlling factor inducing the slope collapsing and sliding,nevertheless slope topography is the key controlling factor leading to collision,debris flow and accumulation of the slope mass fractured in latter process.
引文
[1]周维垣.高等岩石力学[M].北京:水利电力出版社,1990.
[2]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1993.
[3]胡光韬.滑坡动力学[M].北京:地质出版社,1995.
[4]殷跃平.汶川地震地质与滑坡灾害概论[M].北京:地质出版社,2009.
[5]殷跃平.汶川八级地震滑坡特征分析[J].工程地质学报,2009,17(1):29-38.
[6]殷跃平.汶川八级地震地质灾害研究[J].工程地质学报,2008,16(4):433-444.
[7]黄润秋,李为乐.“5.12”汶川大地震触发地质灾害的发育分布规律研究[J].岩石力学与工程学报,2008,17(12):2585-2592.
[8]黄润秋,李为乐.汶川大地震触发地质灾害的断层效应分析[J].工程地质学报,2009,17(1):19-28.
[9]黄润秋,许强.中国典型灾难性滑坡[M].北京:科学出版社,2008.
[10]许强,黄润秋.5.12汶川大地震诱发大型崩滑灾害动力特征初探[J].工程地质学报,2008,16(6):721-729.
[11]毛彦龙,胡广韬,毛新虎,等.地震滑坡启程剧动的机理研究及离散元模拟[J].工程地质报,2001,9(1):74-80.
[12]祁生文,伍法权,严福章,等.岩质边坡动力反应分析[M].北京:科学出版社,2007.
[13]祁生文,伍法权,刘春玲,等.地震边坡稳定性的工程地质分析[J].岩石力学与工程学报,2004,23(16):2792-2796.
[14]祁生文,许强,刘春玲,等.汶川地震极重灾区地质背景及次生斜坡灾害空间发育规律[J].工程地质学报,2009,17(1):39-49.
[15]崔芳鹏.地震P-S波时差耦合作用的斜坡崩滑效应研究[D].北京:中国科学院地质与地球物理研究所,2009.
[16]崔芳鹏,胡瑞林,殷跃平,等.地震纵横波时差耦合作用的斜坡崩滑效应研究[J].工程地质学报,2009,17(4):455-462.
[17]崔芳鹏,胡瑞林,张明,等.重庆小南海地震崩滑体的基本特征及形成机制研究[J].工程地质学报,2009,17(2):167-174.
[18]崔芳鹏,胡瑞林,殷跃平,等.纵横波时差耦合作用的斜坡崩滑效应离散元分析——以北川唐家山滑坡为例[J].岩石力学与工程学报,2010,29(2):319-327.
[19]崔芳鹏,胡瑞林,殷跃平,等.地震动力作用触发的斜坡崩滑高差效应研究[J].水文地质工程地质,2010,37(4):38-43.
[20]崔芳鹏,殷跃平,许强,等.地震纵横波时差耦合作用的斜坡崩滑响应研究[J].岩土工程学报,2010,32(8):1266-1273.
[21]Itasca Consulting Group,Inc.Universal Distinct Ele-ment Code Theory and background[M].[S.l.]:[s.n.],2005.
[22]胡聿贤.地震工程学[M].北京:地震出版社,1988.
[2]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1993.
[3]胡光韬.滑坡动力学[M].北京:地质出版社,1995.
[4]殷跃平.汶川地震地质与滑坡灾害概论[M].北京:地质出版社,2009.
[5]殷跃平.汶川八级地震滑坡特征分析[J].工程地质学报,2009,17(1):29-38.
[6]殷跃平.汶川八级地震地质灾害研究[J].工程地质学报,2008,16(4):433-444.
[7]黄润秋,李为乐.“5.12”汶川大地震触发地质灾害的发育分布规律研究[J].岩石力学与工程学报,2008,17(12):2585-2592.
[8]黄润秋,李为乐.汶川大地震触发地质灾害的断层效应分析[J].工程地质学报,2009,17(1):19-28.
[9]黄润秋,许强.中国典型灾难性滑坡[M].北京:科学出版社,2008.
[10]许强,黄润秋.5.12汶川大地震诱发大型崩滑灾害动力特征初探[J].工程地质学报,2008,16(6):721-729.
[11]毛彦龙,胡广韬,毛新虎,等.地震滑坡启程剧动的机理研究及离散元模拟[J].工程地质报,2001,9(1):74-80.
[12]祁生文,伍法权,严福章,等.岩质边坡动力反应分析[M].北京:科学出版社,2007.
[13]祁生文,伍法权,刘春玲,等.地震边坡稳定性的工程地质分析[J].岩石力学与工程学报,2004,23(16):2792-2796.
[14]祁生文,许强,刘春玲,等.汶川地震极重灾区地质背景及次生斜坡灾害空间发育规律[J].工程地质学报,2009,17(1):39-49.
[15]崔芳鹏.地震P-S波时差耦合作用的斜坡崩滑效应研究[D].北京:中国科学院地质与地球物理研究所,2009.
[16]崔芳鹏,胡瑞林,殷跃平,等.地震纵横波时差耦合作用的斜坡崩滑效应研究[J].工程地质学报,2009,17(4):455-462.
[17]崔芳鹏,胡瑞林,张明,等.重庆小南海地震崩滑体的基本特征及形成机制研究[J].工程地质学报,2009,17(2):167-174.
[18]崔芳鹏,胡瑞林,殷跃平,等.纵横波时差耦合作用的斜坡崩滑效应离散元分析——以北川唐家山滑坡为例[J].岩石力学与工程学报,2010,29(2):319-327.
[19]崔芳鹏,胡瑞林,殷跃平,等.地震动力作用触发的斜坡崩滑高差效应研究[J].水文地质工程地质,2010,37(4):38-43.
[20]崔芳鹏,殷跃平,许强,等.地震纵横波时差耦合作用的斜坡崩滑响应研究[J].岩土工程学报,2010,32(8):1266-1273.
[21]Itasca Consulting Group,Inc.Universal Distinct Ele-ment Code Theory and background[M].[S.l.]:[s.n.],2005.
[22]胡聿贤.地震工程学[M].北京:地震出版社,1988.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心