In order to research the carbonaceous mudstone embankment stability during the period of water level fluctuation, on the basis of exploring the influence factors of embankment stability, an evaluation method of embankment stability which simultaneously considered the water pressure in front of slope, pore water pressure, pore water gravity, seepage force, softening, and unsaturated strength was proposed by combing the basic theory of seepage and stability analysis and seepage characteristics and stability of carbonaceous mudstone embankment during the water level fluctuation were calculated. The results show that the embankment stability evaluation method presented in this paper with a strong applicability and pertinence can comprehensively evaluate the carbonaceous mudstone embankment stability with the influence of multiple factors. During the water level rising stage and the high water level constant stage, the water table, pore water pressure and saturation in the interior embankment rise gradually. The ascending range of pore water pressure is inversely proportional to the elevation but the increasing amplitude of saturation is proportional to the elevation. The horizontally inward and vertically downward seepage force, peak, and the horizontally inward displacement increase first and then decrease but vertically upward displacement increases constantly. During the water level falling stage and the low water level constant stage, the water table, pore water pressure, saturation of the interior embankment gradually decrease. The decreasing range of pore water pressure is inversely proportional to the elevation but the decreasing amplitude of saturation is proportional to the elevation. The horizontally outward seepage force and its peak, the horizontally outward and vertically downward displacement as well as plastic zone area increase first and then decrease with the vertically downward seepage force in “Ƨ” shape. The research results provide references for the construction and stability control of the carbonaceous mudstone embankment of the reservoir and river area.
Key words
road engineering /
carbonaceous mudstone embankment /
numerical computation /
water level fluctuation /
seepage characteristic /
stability
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