FEM ANALYSIS OF DAM STABILITY AFFECTED BY WATER LEVEL CHANGE AND GEOGRID

机译：水位变化和土工格栅对大坝稳定性的有限元分析

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Pore water pressure redistributed when water level change that influence the stability of dam. Technique of reinforced soil has been widely used in dam engineering, the mechanism of its development for stability of dam should be lucubrated. Combined with project example, the paper use shear strength reduction method based on FEM theory,from aspects of the water level change magnitude and velocity , behaviors of geogrid:stiffness, layout span, interface behavior between soil and geogrid, calculate the safety factor of dam on soft soil foundation and the latent failure surface location. By calculation can get conclusions as follow. Water level increases and descends lead to the decline of dam's stability, latent failure surface inside or outside the dam depend on the water level lift up or descend. The latent failure surface exists at the outside of dam when water level risen, or at the inner of dam when water level descend. When the water level changes fast,due to the lag of the pore water pressure redistribution, stabiIity of dam descend. By using geogrid can increase the stability of dam in general, the development of stability varies with the geogrid's layout manner, stiffness of geogrid. Lack or excessive of geogrid all lead to the inefficacy for development of dam stability. Coarse grain dam filling material have the well interface behavior between soil and geogrid, can develop the stability of dam apparently.

机译：当水位变化影响大坝稳定性时，孔隙水压力会重新分配。加筋土技术已在大坝工程中得到广泛应用，其发展机理对大坝的稳定性应予以重视。结合工程实例，采用基于有限元理论的抗剪强度折减法，从水位变化幅值和速度，土工格栅的行为：刚度，布置跨度，土与土工格栅的界面行为等方面，计算大坝的安全系数。在软土地基上和潜在破坏面的位置。通过计算可以得出以下结论。水位的上升和下降导致大坝的稳定性下降，大坝内部或外部的潜在破坏面取决于水位的上升或下降。当水位上升时，潜在破坏面存在于大坝外部，而当水位下降时，潜在破坏面存在于大坝内部。当水位快速变化时，由于孔隙水压力重新分布的滞后，坝体的稳定性下降。使用土工格栅通常可以增加大坝的稳定性，其稳定性的发展随土工格栅的布置方式，土工格栅的刚度而变化。土工格栅的缺乏或过多都会导致大坝稳定性发展的效率低下。粗粮坝填料在土壤与土工格栅之间具有良好的界面行为，可以明显提高坝体的稳定性。

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来源
《Sino-Japan Geotechnical Symposium November; 20071104-07; Chongqing(CN)》|2007年|P.466-470|共5页
会议地点 Chongqing(CN)
作者
JUNLING REN; PENG LV; HAI DENG; GUOAN WANG;
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作者单位

Logistics Group,Shijiazhuang Railway Institute,Shijiazhuang,Hebei Province,050043,China;

College of Construction Engineering, Shijiazhuang Railway Institute,Shijiazhuang,Hebei Proving,050043,China;

College of Construction Engineering, Shijiazhuang Railway;

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原文格式 PDF
正文语种 eng
中图分类土力学、地基基础工程;
关键词
Soft Soil Foundation; Reinforced Soil; Stability of Dam; FEM; Shear Strength Reduction Method (SSR);

机译：软土地基；加筋土；大坝稳定性；有限元；抗剪强度折减法;

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FEM ANALYSIS OF DAM STABILITY AFFECTED BY WATER LEVEL CHANGE AND GEOGRID

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