水力条件下具有张裂缝临河边坡稳定性分析

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Abstract Due to affect of many factors，cracks might appear on the top surface of slope along river. The slope would become more and more unstable under hydraulic situation so as to lead to slope instability. Therefore，it is of great significance to study the stability of slope with crack near river under hydraulic situation. Based on methods of linear sliding surface，circular sliding surface and a new method of searching for sliding surface，the stabilities of slopes with crack near river are analyzed. In consideration of seepage，flow nets are reasonably simplified；and soil mass and soil skeleton are taken as research object respectively or method of equivalent bulk density are used to analyze the force of sliding mass. When sliding surface is linear，formulae for calculating safety factor are derived in slopes with shapes of broken lines and steps. The influences of water levels outside slope or in crack on stability of slope are studied respectively by case study. Some conclusions are drawn as follows：(1) According to the calculation results，the minimum safety factors got by method of linear sliding surface are the largest；and values got by a new method of searching for sliding surface are close to，but smaller than those got by method of circular sliding surface. (2) When the type of method of searching for sliding surface is same，the research results obtained by taking soil mass and soil skeleton as research object are consistent. The research results obtained by taking soil skeleton as research object and using method of equivalent bulk density are equivalent. (3) When the water level outside slope is at or below a certain height，all different types of methods of searching for sliding surface show that slope would be unstable. (4) The minimum safety factors got by different types of methods of searching for sliding surface gradually decrease with increasing water level in crack，which indicate that the higher the water level in crack is，more unstable the slope is.

Key words： slope engineering stability analysis slope near river tension crack seepage sliding surface factor of safety

Received: 03 December 2010

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http://www.rockmech.org/EN/Y2011/V30/I9/1835

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