强震作用下加固边坡的动力响应及不同加固方式的比较研究
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摘要
文章建立一土质边坡模型,按照常规设计支护技术参数,对在强震作用下的挡土墙、抗滑桩和预应力锚索3种支护形式下的边坡进行动力分析,得到不同支护方式下边坡的动力响应,重点从动力放大系数、残余变形、动轴力、动拉应力等方面,对3种支护形式的加固效果做对比。结果表明,动力响应差别很大,动力放大系数以抗滑桩加固最大,挡土墙加固最小;残余变形以挡土墙加固最大,预应力锚索加固最小,挡土墙加固难以维持强震下边坡的整体稳定;挡土墙加固下坡顶面出现拉应力最大;综合比较,预应力锚索加固效果最优,应作为多震地区边坡防治的首选方案。
The dynamic analysis of the soil slope bearing intense earthquakes is conducted seperately under three support modes—the retaining wall,the anti-slide pile,and the prestressed cable,and the slope's dynamic responses are obtained.Moreover,the effects of the three support modes are compared.The results show that the slope's dynamic response under the three support modes are very different,the anti-slide pile produces was the greatest dynamic amplification,while the retaining wall brings about the smallest.As for the residual deformation,the retaining wall makes the greatest,and the prestressed cable results in the smallest,and the retaining wall is not effective enough to ensure stability of the slope.Tense stress appears on the top surface of the slope under the three support modes.As a whole,the prestressed cable has more advantages among the three support modes,and should be the preferred support method for the protection of slopes in mountainous areas.
The dynamic analysis of the soil slope bearing intense earthquakes is conducted seperately under three support modes—the retaining wall,the anti-slide pile,and the prestressed cable,and the slope's dynamic responses are obtained.Moreover,the effects of the three support modes are compared.The results show that the slope's dynamic response under the three support modes are very different,the anti-slide pile produces was the greatest dynamic amplification,while the retaining wall brings about the smallest.As for the residual deformation,the retaining wall makes the greatest,and the prestressed cable results in the smallest,and the retaining wall is not effective enough to ensure stability of the slope.Tense stress appears on the top surface of the slope under the three support modes.As a whole,the prestressed cable has more advantages among the three support modes,and should be the preferred support method for the protection of slopes in mountainous areas.
引文
[1]李树德,任秀生,岳升阳,等.地震滑坡研究[J].水土保持研究,2001,8(2):24-25.
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[3]周本刚,王裕明.中国西南地区地震滑坡的基本特征[J].西北地震学报,1994,16(1):95-103.
[4]康来迅,邹谨敞,蒋荣发.昌马断裂带地震滑坡的基本特征[J].华南地震,1995,15(1):49-54.
[5]毛彦龙,胡广韬,赵法锁,等.地震动触发滑坡体滑动的机理[J].西安工程学院学报,1998,20(4):45-48.
[6]Khazai B,Sitar N.Evaluation of factors controlling earth-quake-induced landslides caused by Chi-Chi earthquake andcomparison with the Northidge and Loma Prieta events[J].Engineering Geology,2003,71:79-95.
[7]Chen T C,Lin M L,Hung J J.Pseudostatic analysis ofTsao-Ling rockslide caused by Chi-Chi earthquake[J].Engi-neering Geology,2003,71:31-47.
[8]Rodríguez C E,Bommer J J,Chandler R J.Earthquake-in-duced landslides:1980—1997[J].Soil Dynamics and Earth-quake Engineering,1999,18:325—346.
[9]Keefer D K.Landslides caused by earthquakes[J].Bulletinof the Geological Society of America,1984,95:406—421.
[2]李天池.四川松潘、平武地震区崩塌和滑坡的若干问题[M]//滑坡文集(第2集).北京:中国铁道出版社,1979.
[3]周本刚,王裕明.中国西南地区地震滑坡的基本特征[J].西北地震学报,1994,16(1):95-103.
[4]康来迅,邹谨敞,蒋荣发.昌马断裂带地震滑坡的基本特征[J].华南地震,1995,15(1):49-54.
[5]毛彦龙,胡广韬,赵法锁,等.地震动触发滑坡体滑动的机理[J].西安工程学院学报,1998,20(4):45-48.
[6]Khazai B,Sitar N.Evaluation of factors controlling earth-quake-induced landslides caused by Chi-Chi earthquake andcomparison with the Northidge and Loma Prieta events[J].Engineering Geology,2003,71:79-95.
[7]Chen T C,Lin M L,Hung J J.Pseudostatic analysis ofTsao-Ling rockslide caused by Chi-Chi earthquake[J].Engi-neering Geology,2003,71:31-47.
[8]Rodríguez C E,Bommer J J,Chandler R J.Earthquake-in-duced landslides:1980—1997[J].Soil Dynamics and Earth-quake Engineering,1999,18:325—346.
[9]Keefer D K.Landslides caused by earthquakes[J].Bulletinof the Geological Society of America,1984,95:406—421.
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