汶川震区陇南三家地滑坡稳定性分析及防治
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摘要
"5·12"汶川地震诱发了大面积的山体滑坡,直接威胁人类的生命财产安全。陇南三家地老滑坡在这次地震期间前缘大规模滑动,并在前缘滑动牵引下诱发后缘形成贯通裂缝,严重威胁滑坡体上三家地村1 732村民的生命财产安全。因此,准确判断该滑坡稳定性,并采取相应的防治措施尤为重要。在对三家地滑坡进行现场勘查、室内试验和相关论证的基础上,阐述该滑坡的基本特征和成因,并运用传递系数法和数值模拟对该滑坡在不同工况下的稳定性及应力应变进行了计算、模拟和评价。研究结果表明,天然状态下,三家地老滑坡的整体稳定性系数为1.30～1.36,处于稳定状态;在地震和暴雨工况下,老滑坡的整体稳定性系数为1.02～1.09,处于欠稳定状态。最后,基于滑坡成因和稳定性评价结果,提出为提高滑坡稳定性应采取的加固措施。
The "5·12" Wenchuan earthquake induced a large number of landslides,which had directly threatened the safety of human lives and properties.The old Sanjiadi landslide in Southern Gansu Province experienced large-scale collapse in foreside and a long,and through cracks formed owing to the front traction during Wenchuan earthquake,which could seriously jeopardize the safety of 1 732 people of the village on it.It is therefore very important to understand adequately and maintain effectively the stability of the landslide.Based on field investigation,indoor test and related studies on Sanjiadi landslide,the basic characteristics and formation mechanism were elaborated.Assuming different working conditions,the stability and stress-strain features were calculated and analyzed by adopting transfer coefficient analysis and numerical simulation.The results show that the integral stability coefficients of the old landslides ranged 1.30～1.36,implying a steady state in the normal condition.Under rainstorm and seismic conditions,the stability coefficients of landslide were 1.02～1.09,indicating an unstable state.Finally,relevant engineering strengthening measures were provided based on the formation mechanism and quantitative evaluation results of the landslides.
The "5·12" Wenchuan earthquake induced a large number of landslides,which had directly threatened the safety of human lives and properties.The old Sanjiadi landslide in Southern Gansu Province experienced large-scale collapse in foreside and a long,and through cracks formed owing to the front traction during Wenchuan earthquake,which could seriously jeopardize the safety of 1 732 people of the village on it.It is therefore very important to understand adequately and maintain effectively the stability of the landslide.Based on field investigation,indoor test and related studies on Sanjiadi landslide,the basic characteristics and formation mechanism were elaborated.Assuming different working conditions,the stability and stress-strain features were calculated and analyzed by adopting transfer coefficient analysis and numerical simulation.The results show that the integral stability coefficients of the old landslides ranged 1.30～1.36,implying a steady state in the normal condition.Under rainstorm and seismic conditions,the stability coefficients of landslide were 1.02～1.09,indicating an unstable state.Finally,relevant engineering strengthening measures were provided based on the formation mechanism and quantitative evaluation results of the landslides.
引文
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[3]黄润秋,李为乐.“5.12”汶川大地震触发地质灾害的发育分布规律研究[J].岩石力学与工程学报,2008,27(12):2585-2592.
[4]黄润秋,李为乐.“5.12”汶川大地震地质灾害的基本特征及其对灾后重建影响的建议[J].中国地质教育,2008(2):21-24.
[5]吴玮江,王念秦.黄土滑坡的基本类型与活动特征[J].中国地质灾害与防治学报,2002,13(2):36-40.
[6]李晓,张年学,李守定,等.奉节白衣庵滑坡演化的工程地质与历史地质分析[J].岩石力学与工程学报,2006,25(12):2416-2424.
[7]祁生文,伍法权,常中华,等.三峡地区奉节县城缓倾层状岸坡变形破坏模式及成因机制[J].岩土工程学报,2006,28(1):88-91.
[8]李守定,李晓,董艳辉,等.重庆万州吉安滑坡特征与成因研究[J].岩石力学与工程学报,2005,29(9):2159-3164.
[9]成国文,李晓,许家美,等.重庆涪陵五中滑坡特征及成因分析[J].工程地质学报,2009,17(2):220-227.
[10]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1994.
[11]祁生文,伍法权,严福章,等.岩质边坡动力反应分析[M].北京:科学出版社,2007.
[12]方玉树.滑坡稳定分析传递系数法若干问题、讨论[J].工程地质学报,2007,15(5):607-611.
[13]陶志平,周德培,岳志勤.滑坡推力计算中传递系数法的改进研究[J].路基工程,2006(5):80-81.
[14]中华人民共和国国家标准编写组.GB50021—2001岩土工程勘察规范[S].北京:中国建筑工业出版社,2002.
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