公路黄土坝式路堤稳定性计算方法
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摘要
为提高公路黄土地区土工膜上游防渗斜墙式坝式路堤的稳定性,分析了地震力对路堤边坡稳定性的影响,引入地震力参数,采用计及条块间作用力的简化毕肖普法推导出路堤边坡稳定性系数计算公式;考虑坡面蓄水压力作用,利用力的平衡原理得出了路堤整体稳定性判定条件。路堤边坡稳定性的计算结果表明,地震力对坝式路堤的稳定性影响较大,稳定性系数在考虑地震力与不考虑地震力时最小误差为0.1(对应烈度为7°);滑出点在坡脚外的稳定性系数远远小于坡面的稳定性系数,边坡浸水稳定性系数小于不浸水稳定性系数,所以边坡稳定性检算应着重考虑滑出点在坡脚外稳定性和浸水稳定性;路堤整体稳定性计算结果表明实际沟底纵坡为2.872%时,路堤整体是稳定的,纵坡为10.000%时,是不稳定的,所以坝式路堤须设置在沟底纵坡较缓的冲沟上。
In order to improve the stability of upper slanting waterproof highway loess dam-like embankment,earthquake effect on slope stability was analyzed,the calculation formula of slope stability coefficient was deduced by introducing earthquake parameter and using simplified Bishop method,the water pressure action and mechanical balance principle of the embankment were studied,its whole stability judgment qualification was got.The calculation result of slope stability shows that earthquake effect on slope stability is great,the minimal error of slope stability coefficient is 0.1(earthquake intensity is 7°) in the conditions of earthquake and no earthquake,relative to the slippery points out of slope bottom and on slope,the slope stability coefficient of the former is less than that of the latter,the stability coefficient value that slope is immersed in water is less than the value that slope is not immersed in water,the slippery point position,immersed state and earthquake effect must be considered when the stability is computed.The whole stability calculation result of the embankment shows that the embankment is safe when ditch gradient is 2.872%,the embankment is ruin when ditch gradient is 10.000%,so loess dam-like embankment must be built on placid ditch.5 tabs,4 figs,15 refs.
In order to improve the stability of upper slanting waterproof highway loess dam-like embankment,earthquake effect on slope stability was analyzed,the calculation formula of slope stability coefficient was deduced by introducing earthquake parameter and using simplified Bishop method,the water pressure action and mechanical balance principle of the embankment were studied,its whole stability judgment qualification was got.The calculation result of slope stability shows that earthquake effect on slope stability is great,the minimal error of slope stability coefficient is 0.1(earthquake intensity is 7°) in the conditions of earthquake and no earthquake,relative to the slippery points out of slope bottom and on slope,the slope stability coefficient of the former is less than that of the latter,the stability coefficient value that slope is immersed in water is less than the value that slope is not immersed in water,the slippery point position,immersed state and earthquake effect must be considered when the stability is computed.The whole stability calculation result of the embankment shows that the embankment is safe when ditch gradient is 2.872%,the embankment is ruin when ditch gradient is 10.000%,so loess dam-like embankment must be built on placid ditch.5 tabs,4 figs,15 refs.
引文
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[2]陆鼎中,程家驹.路基路面工程[M].上海:同济大学出版社,1999.
[3]方左英.路基工程[M].北京:人民交通出版社,1996.
[4]石刚,王晋国,支喜兰,等.黄土地区公路工程地基承载力分区计算方法[J].交通运输工程学报,2005,5(4):48-52.Shi Gang,Wang Jin-guo,Zhi Xi-lan,et al.Calculation methodof foundation bearing capacity based on division in loess areafor highway engineering[J].Journal of Traffic and Transpor-tation Engineering,2005,5(4):48-52.(in Chinese)
[5]冯忠居,冯瑞玲,赵占厂,等.黄土湿陷性对桥梁桩基承载力的影响[J].交通运输工程学报,2005,5(3):60-63.Feng Zhong-ju,Feng Rui-ling,Zhao Zhan-chang,et al.Effectof collapsible loess on pile foundation bearing capacity[J].Journal of Traffic and Transportation Engineering,2005,5(3):60-63.(in Chinese)
[6]刘保健,支喜兰,谢永利,等.公路工程中黄土湿陷性问题分析[J].中国公路学报,2005,18(4):27-31.Liu Bao-jian,Zhi Xi-lan,Xie Yong-li,et al.Analysis of prob-lems on loess hydrocompaction in highway engineering[J].China Journal of Highway and Transport,2005,18(4):27-31.(in Chinese)
[7]石刚,支喜兰,刘怡林,等.黄土地基承载力的模糊评判方法[J].长安大学学报:自然科学版,2006,26(2):14-17.Shi Gang,Zhi Xi-lan,Liu Yi-lin,et al.Fuzzy evaluation of loessfoundation bearing capacity[J].Journal of Chang an University:Natural Science Edition,2006,26(2):14-17.(in Chinese)
[8]SL 274-2001,碾压式土石坝设计规范[S].
[9]成都科技大学,甘肃省交通厅公路局,甘肃省交通科研所.黄土地区公路特殊结构研究[R],兰州:甘肃省交通厅公路局,1992.
[10]钱家欢,段宗泽.土工原理与计算[M].北京:中国水利水电出版社,1996.
[11]王文生,谢永利,梁军林.膨胀土路堑边坡的破坏形式和稳定性[J].长安大学学报:自然科学版,2005,25(1):20-24.Wang Wen-sheng,Xie Yong-li,Liang Jun-lin.Classification ofexpansive clay slope on road cutting[J].Journal of Chang anUniversity:Natural Science Edition,2005,25(1):20-24.(inChinese)
[12]刘祖典.黄土力学与工程[M].西安:陕西科学技术出版社,1997.
[13]王东耀,折学森,叶万军,等.高速公路软基最终沉降预测的范例推理方法[J].长安大学学报:自然科学版,2006,26(1):20-23.Wang Dong-yao,She Xue-sen,Ye Wan-jun,et al.Case-basedreasoning approach to settlement of expressway on soft foun-dation[J].Journal of Chang an University:Natural ScienceEdition,2006,26(1):20-23.(in Chinese)
[14]GB 50286-98,堤防工程设计规范[S].
[15]王晓谋,袁怀宇.高等级公路软土地基路堤设计与施工技术[M].北京:人民交通出版社,2001.
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