基于拟静力法的大岗山坝肩边坡地震工况稳定性分析
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摘要
以目前国内设计地震烈度最大的水电站工程——大岗山坝肩边坡工程为实例,根据规范,选用拟静力法对坝肩边坡地震工况下的稳定性进行分析,并对该方法进行相应改进。基于合理的边坡岩体参数、锚固参数和地震参数,对坡体在不同地震加速度下的应力、应变、塑性区及锚索应力进行研究。指出不同剖面地质条件下,不同烈度下边坡关键点位移随边坡高度的变化规律,同时得到不同剖面地震作用的主要影响区域(敏感区域)和地震中塑性区随地震加速度的演化规律,提出相应滑移模式,为支护提供依据。分析认为,考虑50a超越概率5%的地震加速度时,边坡的V类岩体和表面坡积物及岩脉γL5,γL6,XL316–1,XL9–15,β6处有较大塑性区,并呈贯通趋势。分析指出V类岩体分层线及岩脉XL316–1,XL9–15对岩坡稳定性有着重要的影响,建议调整V类岩体参数并进一步查明岩脉XL316–1,XL9–15的分布情况及连通率。
The general engineering situation of an abutment slope located in the complex area of Dagangshan Hydropower Station with the maximum design and check seismic intensity at present in China is introduced. According to relative regulations,the pseudo-static method is selected to analyze the stability of Dagangshan dam abutment slope under earthquake;and the method has been improved correspondingly. Based on reasonable rock mass parameters,anchoring parameters and seismic parameters of slope,the stress,strain,plastic zone of the slope under different earthquake accelerations and the cable′s stress are studied. Then the variation laws of displacement of critical points changing with slope height under different geological conditions and seismic intensities are pointed out;and the main affected area(sensitive area) of different sections under earthquake,the evolutionary laws of plastic zone in the process of earthquake and the corresponding slip modes are obtained,which could offer references for supports. It is considered that,under the earthquake acceleration with 5% exceeding probability in the next 50 years,large plastic area appears in the rock grade V,accumulation body and the areas with rock dikes γL5,γL6,XL316–1,XL9–15 and β6. The plastic areas become larger and show a tendency of transfixion. It is shown that layers in the rock grade V and rock dikes XL316–1,XL9–15 are important for stability of rock slope. It is also suggested that parameters of rock grade V needs to be adjusted so as to further ascertain the distribution and connectivity rate of rock dikes XL316–1,XL9–15.
The general engineering situation of an abutment slope located in the complex area of Dagangshan Hydropower Station with the maximum design and check seismic intensity at present in China is introduced. According to relative regulations,the pseudo-static method is selected to analyze the stability of Dagangshan dam abutment slope under earthquake;and the method has been improved correspondingly. Based on reasonable rock mass parameters,anchoring parameters and seismic parameters of slope,the stress,strain,plastic zone of the slope under different earthquake accelerations and the cable′s stress are studied. Then the variation laws of displacement of critical points changing with slope height under different geological conditions and seismic intensities are pointed out;and the main affected area(sensitive area) of different sections under earthquake,the evolutionary laws of plastic zone in the process of earthquake and the corresponding slip modes are obtained,which could offer references for supports. It is considered that,under the earthquake acceleration with 5% exceeding probability in the next 50 years,large plastic area appears in the rock grade V,accumulation body and the areas with rock dikes γL5,γL6,XL316–1,XL9–15 and β6. The plastic areas become larger and show a tendency of transfixion. It is shown that layers in the rock grade V and rock dikes XL316–1,XL9–15 are important for stability of rock slope. It is also suggested that parameters of rock grade V needs to be adjusted so as to further ascertain the distribution and connectivity rate of rock dikes XL316–1,XL9–15.
引文
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[9]刘如山,胡少卿,石宏彬.地下结构抗震计算中拟静力法的地震荷载施加方法研究[J].岩土工程学报,2007,29(2):237–242.(LIU Rushan,HU Shaoqing,SHI Hongbin.Study on seismic loading of pseudo-static approach used in the seismic design of underground structure[J].Chinese Journal of Geotechnical Engineering,2007,29(2):237–242.(in Chinese))
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[12]陈昌凯,阮永芬,熊恩来.地震作用下边坡稳定的动力分析方法[J].地下空间与工程学报,2005,1(7):1054–1057.(CHEN Changkai,RUAN Yongfen,XIONG Enlai.Dynamic analysis method of slope stability in earthquake function[J].Chinese Journal of Underground Space and Engineering,2005,1(7):1054–1057.(in Chinese))
[13]汪小刚,张建红,赵毓芝,等.用离心模型研究岩石边坡的倾倒破坏[J].岩土工程学报,1996,18(5):14–21.(WANG Xiaogang,ZHANG Jianhong,ZHAO Yuzhi,et al.Investigations on mechanism of slope toppling failure by centrifuge model testing[J].Chinese Journal of Geotechnical Engineering,1996,18(5):14–21.(in Chinese))
[14]李维光,张继春.地震作用下顺层岩质边坡稳定性的拟静力分析[J].山地学报,2007,25(2):184–189.(LI Weiguang,ZHANG Jichun.Pseudo static stability study on rock mass bedding slope under earthquake[J].Journal of Mountain Science,2007,25(2):184–189.(in Chinese))
[15]GRIFFITHS D V,MADIAI C,LANE P A.Slope stability analysis[J].Geotechnigue,1999,49(3):387–403.
[16]BISHOP A W.The use of slip circle in the stability of slope[J].Geotechnique,1955,5(1):7–17.
[17]吕擎峰,殷宗泽.高土石坝坝坡稳定非线性分析[J].岩土力学,2004,25(5):793–797.(LU Qingfeng,YIN Zongze.Nonlinear analysis of slope stability for high earth-rock fill dams[J].Rock and Soil Mechanics,2004,25(5):793–797.(in Chinese))
[18]吕擎峰,殷宗泽,王叔华,等.拟静力法边坡稳定分析的改进[J].岩土力学,2005,26(增1):35–38.(LU Qingfeng,YIN Zongze,WANG Shuhua,et al.Improvement of pseudo-static method for slope stability analysis[J].Rock and Soil Mechanics,2005,26(Supp.1):35–38.(in Chinese))
[2]高丽霞,周锡元,董娣,等.加速度均方根地震动统计研究[J].防灾减灾工程学报,2006,26(3):251–256.(GAO Lixia,ZHOU Xiyuan,DONG Di,et al.Study on statistical characteristic of groundof square root of mean squares[J].Journal of Disaster Prevention and Mitigation Engineering,2006,26(3):251–256.(in Chinese))
[3]王志华,刘汉龙,陈国兴.平稳随机地震动模型及其在土石坝随机地震反应分析中的应用[J].防灾减灾工程学报,2006,26(4):389–394.(WANG Zhihua,LIU Hanlong,CHEN Guoxing.Study on stationary stochastic seismic motion model and stochastic earthquake response of earth-rock fill dam[J].Journal of Disaster Prevention and Mitigation Engineering,2006,26(4):389–394.(in Chinese))
[4]王国权,周锡元.台湾集集地震近断层强震地面运动加速度时程的随机特性[J].防灾减灾工程学报,2003,23(4):10–19.(WANG Guoquan,ZHOU Xiyuan.The randomness of near fault acceleration time history of the1999Chi-Chi earthquake,Taiwan,China[J].Journal of Disaster Prevention and Mitigation Engineering,2003,23(4):10–19.(in Chinese))
[5]CRESPELLANI T,MADIAI C,VANNUCCHI G.Earthquake destructiveness potential factor and slope stability[J].Geotechnigue,1998,48(3):411–419.
[6]郭诚谦.混凝土面板堆石坝坝顶结构设计及其拟静力法的抗震分析[J].水利水电技术,2008,39(5):26–29.(GUO Chengqian.Design of crest structure for concrete-faced rockfill dam and its seismic analysis with pseudo-static approach[J].Water Resources and Hydropower Engineering,2008,39(5):26–29.(in Chinese))
[7]邱法维,钱稼茹.拟动力实验方法的若干应用[J].工程力学,1999,16(1):78–88.(QIU Fawei,QIAN Jiaru.Some applications of pseudo dynamic testing method[J].Engineering Mechanics,1999,16(1):78–88.(in Chinese))
[8]於昌荣,黄真,黄醒春,等.用拟静力法对斜隅支撑框架的地震反应分析[J].铁道建筑,2008,36(12):110–113.(YU Changrong,HUANG Zhen,HUANG Xingchun,et al.Earthquake response analysis of the knee bracing frame based on quasi-static method[J].Railway Engineering,2008,36(12):110–113.(in Chinese))
[9]刘如山,胡少卿,石宏彬.地下结构抗震计算中拟静力法的地震荷载施加方法研究[J].岩土工程学报,2007,29(2):237–242.(LIU Rushan,HU Shaoqing,SHI Hongbin.Study on seismic loading of pseudo-static approach used in the seismic design of underground structure[J].Chinese Journal of Geotechnical Engineering,2007,29(2):237–242.(in Chinese))
[10]刘哲锋,沈蒲生,龚胡广.基于拟力法的框架结构静力弹塑性分析[J].建筑科学与工程学报,2006,23(3):32–36.(LIU Zhefeng,SHEN Pusheng,GONG Huguang.Static elasticplastic analysis of frame structure based on force analogy method[J].Journal of Architecture and Civil Engineering,2006,23(3):32–36.(in Chinese))
[11]包承纲,饶锡保.土工离心模型的试验原理[J].长江科学院院报,1998,15(2):2–7.(BAO Chenggang,RAO Xibao.Principle of the geotechnical centrifuge model test[J].Journal of Yangtze River Scientific Research Institute,1998,15(2):2–7.(in Chinese))
[12]陈昌凯,阮永芬,熊恩来.地震作用下边坡稳定的动力分析方法[J].地下空间与工程学报,2005,1(7):1054–1057.(CHEN Changkai,RUAN Yongfen,XIONG Enlai.Dynamic analysis method of slope stability in earthquake function[J].Chinese Journal of Underground Space and Engineering,2005,1(7):1054–1057.(in Chinese))
[13]汪小刚,张建红,赵毓芝,等.用离心模型研究岩石边坡的倾倒破坏[J].岩土工程学报,1996,18(5):14–21.(WANG Xiaogang,ZHANG Jianhong,ZHAO Yuzhi,et al.Investigations on mechanism of slope toppling failure by centrifuge model testing[J].Chinese Journal of Geotechnical Engineering,1996,18(5):14–21.(in Chinese))
[14]李维光,张继春.地震作用下顺层岩质边坡稳定性的拟静力分析[J].山地学报,2007,25(2):184–189.(LI Weiguang,ZHANG Jichun.Pseudo static stability study on rock mass bedding slope under earthquake[J].Journal of Mountain Science,2007,25(2):184–189.(in Chinese))
[15]GRIFFITHS D V,MADIAI C,LANE P A.Slope stability analysis[J].Geotechnigue,1999,49(3):387–403.
[16]BISHOP A W.The use of slip circle in the stability of slope[J].Geotechnique,1955,5(1):7–17.
[17]吕擎峰,殷宗泽.高土石坝坝坡稳定非线性分析[J].岩土力学,2004,25(5):793–797.(LU Qingfeng,YIN Zongze.Nonlinear analysis of slope stability for high earth-rock fill dams[J].Rock and Soil Mechanics,2004,25(5):793–797.(in Chinese))
[18]吕擎峰,殷宗泽,王叔华,等.拟静力法边坡稳定分析的改进[J].岩土力学,2005,26(增1):35–38.(LU Qingfeng,YIN Zongze,WANG Shuhua,et al.Improvement of pseudo-static method for slope stability analysis[J].Rock and Soil Mechanics,2005,26(Supp.1):35–38.(in Chinese))
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