基于FLAC~(3D)的边坡滑面搜索法及动力稳定性分析
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摘要
针对边坡动力分析中的滑面搜索及稳定性定量评价,基于FLAC3D弹塑性分析,提出一种剪应变增量搜索边坡滑面的方法,并用矢量和方法计算安全系数,采用FLAC3D的内置FISH语言,实现地震动力时程中滑面自动搜索和动力安全系数计算,即变滑面动力稳定分析。算例表明,该方法计算结果与强度折减法、刚体极限平衡法所得结果非常接近,并成功用于卡拉水电站上田镇滑坡体动力稳定性分析,表明所提方法的有效性和优越性。
In order to achieve slip surface searching and quantitative evaluation of dynamic stability for slope,based on elastic-plastic analysis by FLAC3 Dcode,a new method of searching slip surface by shear strain increment was presented,as well as calculating safety factor by vector sum analysis. FISH language in FLAC3 Dwas used to achieve automatically searching slip surface and calculating dynamic safety factor,which is called variable slip surface dynamic stability analysis. Using example slope validated credibility of calculation result to be consistent with the result of shear strength reduction technique and the limit equilibrium. At the same time,the proposed method was successfully used in stability analysis of Shangtianzhen landslide in Kala hydropower of Yalong River,which was given to validate the practicability and advantage of this method.
In order to achieve slip surface searching and quantitative evaluation of dynamic stability for slope,based on elastic-plastic analysis by FLAC3 Dcode,a new method of searching slip surface by shear strain increment was presented,as well as calculating safety factor by vector sum analysis. FISH language in FLAC3 Dwas used to achieve automatically searching slip surface and calculating dynamic safety factor,which is called variable slip surface dynamic stability analysis. Using example slope validated credibility of calculation result to be consistent with the result of shear strength reduction technique and the limit equilibrium. At the same time,the proposed method was successfully used in stability analysis of Shangtianzhen landslide in Kala hydropower of Yalong River,which was given to validate the practicability and advantage of this method.
引文
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[11]Guo Mingwei,Ge Xiurun,Li Chunguang,et al.Study on potential sliding in slope stability analysis based on vector sum method[J].Chinese Journal of Geotechnical Engineering,2009,31(4):577-583.[郭明伟,葛修润,李春光.基于矢量和方法的边坡稳定性分析中整体下滑趋势方向的探讨[J].岩土工程学报,2009,31(4):577-583.]
[2]Guo Mingwei,Ge Xiurun,Wang Shuilin,et al.Dynamic stability analysis of slope based on vector sum analysis method[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(3):572-579.[郭明伟,葛修润,王水林,等.基于矢量和方法的边坡动力稳定性分析[J].岩石力学与工程学报,2011,30(3):572-579.]
[3]Liu Jingbo,Liu Xiangqing,Wang Zonggang.Boundary effect of laminar model box for shaking table tests on geotechnical centrifuge system[J].Journal of Beijing University of Technology,2008,34(9):931-937.[刘晶波,刘祥庆,王宗纲.离心机振动台试验叠环式模型箱边界效应[J].北京工业大学学报,2008,34(9):931-937.]
[4]Liu Chunling,Qi Shengwen,Tong Liqiang,et al.Stability analysis of slope under earthquake with FLAC3D[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(16):2730-2733.[刘春玲,祁生文,童立强,等.利用FLAC3D分析某边坡地震稳定性[J].岩石力学与工程学报,2004,23(16):2730-2733.]
[5]Guo Mingwei,Li Chunguang,Ge Xiurun,et al.Searching potential slip surface of slopes based on the vector sum analysis method[J].Rock and Soil Mechanics,2009,30(6):1775-1781.[郭明伟,李春光,葛修润,等.基于矢量和分析方法的边坡滑面搜索[J].岩土力学,2009,30(6):1775-1781.]
[6]Sun Guanhua,Zheng Hong,Li Chunguang.Searching critical slip surface of slopes based on equivalent plastic strain[J].Rock and Soil Mechanics,2008,29(5):1159-1163.[孙冠华,郑宏,李春光.基于等效塑性应变的边坡滑面搜索[J].岩土力学,2008,29(5):1159-1163.]
[7]Tian Dongfang,Liu Chengbin.Application of genetic algorithm to searching potential sliding plane[J].Journal of China Three Gorges University:Natural Sciences,2009,31(3):18-21.[田东方,刘成斌.基于遗传算法的危险滑面搜索[J].三峡大学学报:自然科学版,2009,31(3):18-21.]
[8]Li Liang,Deng Dongping,Zhao Lianheng.Application of new method of arbitrary slip surface search to stability analysis of complex three dimensional slopes[J].Chinese Journal of Geotechnical Engineering,2011,33(4):544-553.[李亮,邓东平,赵炼恒.任意滑动面搜索新方法应用于三维复杂土坡稳定性分析[J].岩土工程学报,2011,33(4):544-553.]
[9]Ding Xiumei,Liu Guangshi,Huang Runqiu,et al.Shear strain increment applying to stability studying of debris slope[J].Advance in Earth Sciences,2004,19(Supp 1):318-323.[丁秀美,刘光士,黄润秋,等.剪应变增量在堆积体边坡稳定性研究中的应用[J].地球科学进展,2004,19(增刊1):318-323.]
[10]Li Zhen,Zhou Hui,Song Yuze,et al.Mechanical model of chlorite schist considering hardening-softening and dilatancy characteristics[J].Rock and Soil Mechanics,2013,34(2):404-410.[李震,周辉,宋雨泽,等.考虑硬化软化和剪胀特性的绿泥石片岩力学模型[J].岩土力学,2013,34(2):404-410.]
[11]Guo Mingwei,Ge Xiurun,Li Chunguang,et al.Study on potential sliding in slope stability analysis based on vector sum method[J].Chinese Journal of Geotechnical Engineering,2009,31(4):577-583.[郭明伟,葛修润,李春光.基于矢量和方法的边坡稳定性分析中整体下滑趋势方向的探讨[J].岩土工程学报,2009,31(4):577-583.]
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