DENG Dongping, LI Liang, ZHAO Lianheng. 2011: A NEW METHOD FOR ANALYSIS OF SLOPE STABILITY UNDER STEADY SEEPAGE. JOURNAL OF ENGINEERING GEOLOGY, 19(1): 29-36.
    Citation: DENG Dongping, LI Liang, ZHAO Lianheng. 2011: A NEW METHOD FOR ANALYSIS OF SLOPE STABILITY UNDER STEADY SEEPAGE. JOURNAL OF ENGINEERING GEOLOGY, 19(1): 29-36.

    A NEW METHOD FOR ANALYSIS OF SLOPE STABILITY UNDER STEADY SEEPAGE

    • This paper is based on the method of random angle generating curve sliding surface. It analyses the stability of slopes comprising different soils under the action of seepage. It changes the value of the selected parameters to search for critical sliding surface. When considering the effect of seepage, the slope soil is modelled as three situations of slice divisions. Mechanical analysis is conduced to derive the formula of buoyancy and penetration of slices in simplified Janbu method. At the same time, in order to apply to computer programming, it made a reasonable simplification for the actual flow field. Through cooperating and analysing examples, it shows that both the minimum factor of safety and the most critical sliding surface obtained by this method are very close or quite similar to the results of the existing methods, which shows the correctness of this method. Secondly, the minimum factor of safety calculated by using non-circular sliding surface method is significantly smaller than that by using circular sliding surface method,which recommends that the non-circular sliding surface method be adopted under action of seepage. Thirdly it analyses the state of slopes by using ratio of height of water level and height of slope as the parameter for two homogeneous slopes under different water levels. The results show that with increase of groundwater level, factor of safety of slopes was sharply declined. So effect of seepage is an important factor for occurring of slope instability. Setting of drainage facilities on slopes should be paid special attention in engineering practice.
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