土工格栅加筋坝坡的抗震效果研究
|
摘要
文章应用动力弹塑性分析方法对土工格栅加筋坝坡的抗震效果进行了研究;通过分析强震作用下坝体的地震反应特性,在加速度反应较大的坝坡——坝顶(1/5 H)范围,对称铺设土工格栅;根据地震作用后坝体的剪应变、永久位移以及稳定安全系数来评价其抗震加固效果,同时研究了高土石坝加筋后的破坏机理。结果表明,土工格栅加筋能加强坝顶区堆石体的稳定,有效控制坝顶部单元变形,使坝体的永久位移变小,坝坡的稳定安全系数增大,能有效控制坝体的浅层滑动,与振动台试验结论较为一致,可为工程实际应用提供理论参考。
This paper studies the anti-seismic effects of geogrid reinforced dam slope by using dynamic elasto-plastic analysis method.By studying the dynamic responses of high earth-rock filled dam under strong earthquake,the geogrids are installed symmetrically in the dam slope(1/5H) with a stronger acceleration response.The dam body's shear strain,permanent displacement and safety factor of stability after earthquake are taken into account and used as a criterion to evaluate the anti-seismic effects.The failure mechanism of the high earth-rock filled dam after reinforcement is also analyzed.The results show that,by adopting the geogrid reinforcement,the stability of the rockfill can be improved at the top of the dam and the collapse of the elements at the top of the slope can be effectively controlled,so the permanent displacement can be greatly reduced,the safety factor of slope stability can be increased,and the shallow slip of the dam body can be effectively controlled.The conclusion is close to that of the shaking table test,which is valuable for the anti-seismic measures in engineering practice.
This paper studies the anti-seismic effects of geogrid reinforced dam slope by using dynamic elasto-plastic analysis method.By studying the dynamic responses of high earth-rock filled dam under strong earthquake,the geogrids are installed symmetrically in the dam slope(1/5H) with a stronger acceleration response.The dam body's shear strain,permanent displacement and safety factor of stability after earthquake are taken into account and used as a criterion to evaluate the anti-seismic effects.The failure mechanism of the high earth-rock filled dam after reinforcement is also analyzed.The results show that,by adopting the geogrid reinforcement,the stability of the rockfill can be improved at the top of the dam and the collapse of the elements at the top of the slope can be effectively controlled,so the permanent displacement can be greatly reduced,the safety factor of slope stability can be increased,and the shallow slip of the dam body can be effectively controlled.The conclusion is close to that of the shaking table test,which is valuable for the anti-seismic measures in engineering practice.
引文
[1]赵剑明,常亚屏,陈宁.加强高土石坝抗震研究的现实意义及工作展望[J].世界地震工程,2004(1):95-99.
[2]顾淦臣.土石坝地震工程[M].南京:河海大学出版社,1989:19-22.
[3]韩国城,孔宪京,李俊杰,等.面板堆石坝永久变形、面板应力及抗震措施研究[R].大连:大连理工大学工程抗震研究所,1995.
[4]孔宪京,韩国城,李俊杰,等.地震时土石填筑坝破坏机理及抗震对策研究[R].大连:大连理工大学工程抗震研究所,1997.
[5]孔宪京,邹德高,邓学晶,等.高土石坝综合抗震措施及其效果的验算[J].水利学报,2006,37(12):1489-1495.
[6]刘莹光.加筋技术在高土石坝中的应用[D].大连:大连理工大学,2006.
[7]韩国城,孔宪京.混凝土面板堆石坝抗震研究进展[J].大连理工大学学报:自然科学版,1996,36(6):708-720.
[8]刘小生,王钟宁,赵剑明,等.面板堆石坝振动模型试验及动力分析研究[J].水利学报,2002,33(2):29-36.
[9]吴景海,陈环,王玲娟,等.土工合成材料与土界面作用特性的研究[J].岩土工程学报,2001,23(1):89-93.
[10]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009:147-235.
[11]彭文斌.FLAC3D实用教程[M].北京:机械工业出版社,2008:148-250.
[12]李永胜.边坡振动台模型试验及相关问题研究[D].大连:大连理工大学,2009.
[13]朱亚林,孔宪京,邹德高.强震区高土石坝的地震反应特性研究[J].合肥工业大学学报:自然科学版,2009,32(12):1884-1887.
[2]顾淦臣.土石坝地震工程[M].南京:河海大学出版社,1989:19-22.
[3]韩国城,孔宪京,李俊杰,等.面板堆石坝永久变形、面板应力及抗震措施研究[R].大连:大连理工大学工程抗震研究所,1995.
[4]孔宪京,韩国城,李俊杰,等.地震时土石填筑坝破坏机理及抗震对策研究[R].大连:大连理工大学工程抗震研究所,1997.
[5]孔宪京,邹德高,邓学晶,等.高土石坝综合抗震措施及其效果的验算[J].水利学报,2006,37(12):1489-1495.
[6]刘莹光.加筋技术在高土石坝中的应用[D].大连:大连理工大学,2006.
[7]韩国城,孔宪京.混凝土面板堆石坝抗震研究进展[J].大连理工大学学报:自然科学版,1996,36(6):708-720.
[8]刘小生,王钟宁,赵剑明,等.面板堆石坝振动模型试验及动力分析研究[J].水利学报,2002,33(2):29-36.
[9]吴景海,陈环,王玲娟,等.土工合成材料与土界面作用特性的研究[J].岩土工程学报,2001,23(1):89-93.
[10]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009:147-235.
[11]彭文斌.FLAC3D实用教程[M].北京:机械工业出版社,2008:148-250.
[12]李永胜.边坡振动台模型试验及相关问题研究[D].大连:大连理工大学,2009.
[13]朱亚林,孔宪京,邹德高.强震区高土石坝的地震反应特性研究[J].合肥工业大学学报:自然科学版,2009,32(12):1884-1887.
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