切层滑坡侵蚀有限元分析研究
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摘要
以切层滑坡侵蚀实例,以西马峪滑坡侵蚀体为研究对象,定性分析了西马峪滑坡侵蚀体的形成与变形破坏特征。结果表明,西马峪滑坡侵蚀体处于临界—不稳定状态;建立了地质模型、数学力学模型,对西马峪滑坡侵蚀体进行有限元分析计算,由有限元计算结果可知,滑动面上已形成了应力集中、分异现象,表明西马峪滑坡侵蚀体处于不稳定状态,如果有暴雨、地震、人工切割坡脚等触发因素,还会导致其再次滑动。应当采取工程治理措施,制止此类水土流失的发生。
Based on a case study of the incision terrain at Ximayu, landslide erosion, forming characteristics, deformation and destruction characteristics are qualitatively analyzed. Results show that the Ximayu landslide-body is unstable. The authors constructed a geological model and a math-mechanical model, and then calculated the landslide body by means of finite elements. The result shows that stress has concentrated on the failure plane, which further supports the evidence that the Ximayu landslide is unstable and may move under heavy rainfall conditions, due to an earthquake or as a result of human activities such as slope cutting. It is suggested that engineering measurements be conducted in order to determine methods for stabilization and the prevention of further erosion.
Based on a case study of the incision terrain at Ximayu, landslide erosion, forming characteristics, deformation and destruction characteristics are qualitatively analyzed. Results show that the Ximayu landslide-body is unstable. The authors constructed a geological model and a math-mechanical model, and then calculated the landslide body by means of finite elements. The result shows that stress has concentrated on the failure plane, which further supports the evidence that the Ximayu landslide is unstable and may move under heavy rainfall conditions, due to an earthquake or as a result of human activities such as slope cutting. It is suggested that engineering measurements be conducted in order to determine methods for stabilization and the prevention of further erosion.
引文
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[10] 中国科学院黄土高原综合科学考察队.黄土高原地区土壤侵蚀区域特征及其治理途径[M].北京:中国科学技术出版社,1990.
[2] 山田刚二,度正亮,小桥澄治.地すベリ·斜面崩坏の实态ヒ对策[M].日本:山海棠,1971.
[3] BromsBB.Landslides,FoundationEngineeringHand-book[M].VanNostrandReinholdCompany,1975.
[4] 郑书彦.滑坡侵蚀及其动力学机制与定量评价研究[D].中国科学院研究生院2002届博士研究生学位论文,2002.
[5] 郑书彦,李占斌,等.宝塔山滑坡侵蚀有限元分析[J].水土保持学报,2002,16(1):113—116.
[6] 郑书彦,李占斌,等.黄土滑坡稳定性及其整治对策研究[J].水土保持通报,2002,22(3):25—27.
[7] 周平根,等.大型滑坡地下水系统的概念模型[J].工程地质学报,2000,8(2):186—190.
[8] 章根德,剡公瑞.岩体高边坡流变学性状有限元分析[J].岩土工程学报,1999,21(2):1—9.
[9] 张信宝,等.黄土高原重力侵蚀的地形与岩性组合因子分析[J].水土保持通报,1989,9(5):40—44.
[10] 中国科学院黄土高原综合科学考察队.黄土高原地区土壤侵蚀区域特征及其治理途径[M].北京:中国科学技术出版社,1990.
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