某高陡型牵引式滑坡群形成机理及治理效果评价
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摘要
为进一步研究高陡型牵引式滑坡群形成机理及治理效果,以贵州某高陡型牵引式滑坡群为例,通过野外地质调查,分析其形成机理主要为:(1)地形地貌高陡,为滑坡形成提供了有利地形条件;(2)松散坡积物与岩层组成的脆弱岩土结构,为滑坡形成奠定了物源基础;(3)坡脚关键阻滑块体缺失使得坡脚临空,为滑坡提供了变形空间,控制牵引式滑坡的形成;(4)水与岩土体相互作用弱化岩土体物理力学性能,是滑坡形成的主要诱因。对该高陡型牵引式滑坡群进行稳定性分析和分区治理,并利用有限元进行治理效果评价,结果充分证明抗滑桩能有效控制牵引式滑坡的位移和应变。其成果对此类高陡型牵引式滑坡群治理具有指导意义。
In order to further study the formation mechanism and governance effect of the high-steep type of traction landslide groups,this paper takes a high-steep type of traction landslide groups in Guizhou as an example and analyzes its formation mechanism through field geological survey:( 1) The topography is high and steep,which provides favorable landform conditions for the formation of landslides;( 2) The fragile rock and soil structure composed of loose sediment and rock stratum,the foundation of the provenance was established of landslides;( 3) The absence of the key anti-slip block in the foot of the slope makes the slope foot appear in the air,which provides the deformation space for the landslide and controls the formation of the traction landslides;( 4)The interaction between the water and the rock as well as soil weakens the physical and mechanical properties of rock and soil,which is the main inducement for landslides formation. The stability analysis and zonal governance measure of the high-steep type of traction landslide group,and the governance effects were evaluated using the finite element method. The result fully demonstrate that the anti-slide pile can effectively control the displacement and strain of the traction landslide. The result has guiding significance for the governance of such the high-steep type of traction landslide group.
In order to further study the formation mechanism and governance effect of the high-steep type of traction landslide groups,this paper takes a high-steep type of traction landslide groups in Guizhou as an example and analyzes its formation mechanism through field geological survey:( 1) The topography is high and steep,which provides favorable landform conditions for the formation of landslides;( 2) The fragile rock and soil structure composed of loose sediment and rock stratum,the foundation of the provenance was established of landslides;( 3) The absence of the key anti-slip block in the foot of the slope makes the slope foot appear in the air,which provides the deformation space for the landslide and controls the formation of the traction landslides;( 4)The interaction between the water and the rock as well as soil weakens the physical and mechanical properties of rock and soil,which is the main inducement for landslides formation. The stability analysis and zonal governance measure of the high-steep type of traction landslide group,and the governance effects were evaluated using the finite element method. The result fully demonstrate that the anti-slide pile can effectively control the displacement and strain of the traction landslide. The result has guiding significance for the governance of such the high-steep type of traction landslide group.
引文
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[13]苏泽志.贵州岩脚滑坡稳定性评价及应急防治措施研究[J].贵州大学学报(自然科学版),2017,34(05):120-125+140.
[14]周忠容,谢宏,丁亚龙.盘县某移民安置点滑坡成因及其影响范围分析[J].贵州大学学报(自然科学版),2016,33(06):136-140.
[15]王庚荪.边坡的渐进破坏及稳定性分析[J].岩石力学与工程学报,2000,19(1):29-33.
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[2]United States Geological Survey. Landslide hazards[R]. Reston,VA,USA:United States GS Fact Sheet(FS-071-00),2000.
[3]黄润秋. 20世纪以来中国的大型滑坡及其发生机制[J].岩石力学与工程学报,2007(03):433-454.
[4]CROSTA G B. Failure and flow development of a complex slide:the1993 Sesa landslide[J]. Engineering Geology,2001,59(1/2):173-199.
[5]BRCKL E P. Cause-effect models of large landslides[J].Natural Hazards,2001,23(2/3):291-314.
[6]崔芳鹏,胡瑞林,谭儒蛟,等.青海八人山滑坡群形成机制及稳定性评价研究[J].岩石力学与工程学报,2008,27(4):848-857.
[7]项伟,江泊洧,唐辉明,等.洞坪库区瞿家湾滑坡群地质演化分析及数值模拟[J].岩石力学与工程学报,2009,28(4):775-783.
[8]徐卫平,屈新,权凯,等.川藏公路沙贡特大古滑坡群特征与形成机制分析[J].人民长江,2016,47(3):42-47.
[9]宋东日,任伟中,等.牵引式滑坡的破坏机制及其加固措施探讨———以某高速公路牵引式滑坡为例[J].岩土力学,2013(12):3587-3593.
[10]KOHV M,HANG T,TALVISTE P,et al. Analysis of a retrogressive landslide in glaciolacustrine varved clay[J]. Engineering Geology,2010,116:109-116.
[11]KOHV M,TALVISTE P,HANG T,et al. Retrogressive slope failure in glaciolacustrine clays:Sauga landslide,western Estonia[J]. Geomorphology,2010,124(3).
[12]张俊瑞.某典型牵引式滑坡形成机制分析及稳定性评价[J].土工基础,2010,24(2):45-52:229-237.
[13]苏泽志.贵州岩脚滑坡稳定性评价及应急防治措施研究[J].贵州大学学报(自然科学版),2017,34(05):120-125+140.
[14]周忠容,谢宏,丁亚龙.盘县某移民安置点滑坡成因及其影响范围分析[J].贵州大学学报(自然科学版),2016,33(06):136-140.
[15]王庚荪.边坡的渐进破坏及稳定性分析[J].岩石力学与工程学报,2000,19(1):29-33.
[16]罗威.堆积层滑坡变形破坏机制分析及支挡结构数值模拟[D].四川:西南交通大学,2017.
[17]滑坡防治工程设计与施工技术规范(DZ/T 0219-2006)[S].中国标准出版社,2006.