焦家崖头北部13号滑坡变形破坏演化机制
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摘要
为进一步研究灌溉作用下滑坡变形破坏机理,评价此类滑坡的稳定性,以甘肃黑方台焦家崖头北部13号滑坡为例,通过野外地质调查,分析其变形破坏特征。在此基础上,基于FLAC3D数值模拟方法分析一定水位下其变形破坏特征,进而概化滑坡变形演化规律。研究结果表明,在灌溉的条件下,该滑坡早期滑动主要为潜蚀-滑移型滑坡,滑动后的再次滑动为塑流-拉裂型滑坡,随着坡体滑移变形的持续和裂隙的进一步扩展,表现出"压制拉裂-剪切破坏"的滑动机理。
In order to investigate deformation and failure of landslide under irrigation and evaluate the stability of the landslide, the authors took No.13 landslide at northern Jiaojiayatou of Heifangtai area in Gansu Province as a study case and performed field geological survey to analyze its characteristics of deformation and failure. On such a basis, the authors employed FLAC3D numerical simulation method to analyze the characteristics of deformation and failure under the constant water level, and then generalized the evolution law of landslide deformation. The results show that, under the condition of irrigation, early sliding of the landslide is mainly characterized by suffosion and sliding landslide, then the sliding landslide exhibits plastic flow and tension crack landslide and, with the further expansion of the slope and crack, the landslide shows a sliding mechanism of"pressing crack-shear failure".
In order to investigate deformation and failure of landslide under irrigation and evaluate the stability of the landslide, the authors took No.13 landslide at northern Jiaojiayatou of Heifangtai area in Gansu Province as a study case and performed field geological survey to analyze its characteristics of deformation and failure. On such a basis, the authors employed FLAC3D numerical simulation method to analyze the characteristics of deformation and failure under the constant water level, and then generalized the evolution law of landslide deformation. The results show that, under the condition of irrigation, early sliding of the landslide is mainly characterized by suffosion and sliding landslide, then the sliding landslide exhibits plastic flow and tension crack landslide and, with the further expansion of the slope and crack, the landslide shows a sliding mechanism of"pressing crack-shear failure".
引文
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[2]王志荣,吴玮江,周自强.甘肃黄土台塬区农业过量灌溉引起的滑坡灾害[J].中国地质灾害与防治学报,2004,15(3):43-47.
[3]王家鼎.高速黄土滑坡的一种机理-饱和黄土蠕动液化[J].地质论评,1992,38(6):532-539.
[4]王家鼎.黑方台坮塬灌溉水诱发黄土滑坡群的系统分析[J].水土保持通报,2001,2(3):10-13.
[5]王家鼎,惠泱河.黄土地区灌溉水诱发滑坡群的研究[J].地理科学,2002,22(3):305-310.
[6]王家鼎,肖树芳,张倬元.灌溉诱发高速黄土滑坡的运动机理[J].工程地质学报,2001,9(3):241-246.
[7]金艳丽,戴福初.灌溉诱发黄土滑坡机理研究[J].岩土工程学报,2007,29(10):1493-1499.
[8]戴福初,陈守义,李焯芬.从土的应力应变特性探讨滑坡发生机理[J].岩土工程学报,2000,22(1):127-130.
[9]张茂省,李同录.黄土滑坡诱发因素及其形成机理研究[J].工程地质学报,2011,19(4):530-540.
[10]张茂省,程秀娟,董英,等.冻结滞水效应及其促滑机理——以甘肃黑方台地区为例[J].地质通报,2013,32(6):852-860.
[11]Sasaki Y,Fujii A,Asai K.Soil creep process and its role in debris slide generation-field measurements on the north side of Tsukuba Mountain in Japan[J].Developments in Geotechnical Engineering,2000,84:199-219.