地震和暴雨工况下边(滑)坡稳定性分析方法评价
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摘要
地震和暴雨同时作用是自然界中引发边(滑)坡灾害的一种极端工况。在分析地震和暴雨同时作用于边(滑)坡的稳定性时,现行规范只能采用将地震及暴雨影响简单叠加的方法。采用GEO-SLOPE软件,对川藏公路和西攀高速公路上的典型边(滑)坡工点,采用动力有限元与极限平衡理论相结合的方法,分析它们在地震和暴雨共同作用下的稳定性,探索采用将地震与暴雨工况简单叠加,以及地震和暴雨耦合分析这两种方法评价边(滑)坡稳定性的差别,并对现行规范计算方法的适用性作出评价。结果表明,地震和暴雨的耦合作用对边(滑)坡稳定性的影响大于地震、暴雨单独作用的叠加对边(滑)坡稳定性影响。
The joint effect of earthquake and rainstorm is the extreme condition which causes landslide in nature.The current codes to evaluate the impacts of both earthquake and rainstorm on slope stability are just a simple addition of the two factors.By using the GEO-SLOPE software and employing dynamics element infinite and limit equilibrium theory,this paper evaluates the stability of the typical slope sites along the Sichuan—Tibet highway and Xichang—Panzhihua freeway under the coupling of earthquake and rainstorm,in order to find the difference of simple addition and the coupling analysis of earthquake and rainstorm,and also evaluates the applicability of regular computational methods.Research has found that the coupling of earthquake and rainstorm has more serious impacts to slope stability than the simple addition of impact of earthquake and rainstorm alone.
The joint effect of earthquake and rainstorm is the extreme condition which causes landslide in nature.The current codes to evaluate the impacts of both earthquake and rainstorm on slope stability are just a simple addition of the two factors.By using the GEO-SLOPE software and employing dynamics element infinite and limit equilibrium theory,this paper evaluates the stability of the typical slope sites along the Sichuan—Tibet highway and Xichang—Panzhihua freeway under the coupling of earthquake and rainstorm,in order to find the difference of simple addition and the coupling analysis of earthquake and rainstorm,and also evaluates the applicability of regular computational methods.Research has found that the coupling of earthquake and rainstorm has more serious impacts to slope stability than the simple addition of impact of earthquake and rainstorm alone.
引文
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[2]林茂炳.汶川大地震与龙门山构造带[J].成都理工大学学报:自然科学版,2008,35(4):366-370.
[3]陈宁生,第宝锋,李战鲁,等.5.12汶川地震龙门山风景区地震次生山地灾害特征与处理[J].山地学报,2008,26(3):272-275.
[4]交通部公路规划设计院.公路工程抗震设计规范(JTJ044-89)[M],北京:人民交通出版社,1999:6-7.
[5]重庆市建设委员会.建筑边坡工程技术规范(GB 50330-2002)[Z].北京,2002:25-27
[6]庄儒新,杨向东,石光炬.基于剩余推力法的地震滑坡稳定性分析[J].西部探矿工程,2008(4):1-3.
[7]罗红明,唐辉明,胡斌,等.考虑地震力的刚体极限平衡法及其工程应用[J].岩石力学与工程学报,2007,26(1):3590-3595.
[8]尹紫红.地震作用下的滑坡稳定性分析[J].铁道建筑,2007(9):65-67.
[9]刘礼领,殷昆龙.暴雨型滑坡降水入渗机理分析[J].岩土力学,2008,29(4):1061-1066.
[10]CHEN Chuan-sheng,JIANG Xin,ZHANG Xu.Liq-uefaction susceptibility of soils with clay particles fromearthquake-induced landslides[J].Research of Soil andWater Conservation,2008,14(5):276-278.
[11]钱家欢,殷宗泽.土工原理与计算[M].2版.北京:中国水利水电出版社,1996:532-535.
[12]陈伟庆,孔书祥.土力学[M].北京:中国铁道出版社,2002:35-40.
[13]刘荣贵,石豫川.暴雨和地震触发滑坡滑速计算[J].地震灾害与环境保护,2007,18(4):20-22.
[14]松涛,任振球.用内外因耦合法预测特大自然灾害[J].中国创业投资与高科技,2004(9):64-65.
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