Ensuring the Reliability of Earth Dams in Complex Hydrogeological Conditions

Abstract

In the considering problem usual tasks of designing ground dams (evaluation of filter strength, compressibility and ground permeability) are overlaid by new tasks, that have never touched upon earlier, that provide reliability of earth dams under extreme conditions and that are exposed by new additional forces such as intensive deformation and curvature of base. Here are dependences allowing determination of accepted values of earth surface deformation of ground dams on undermined territories. Using this methodology, you can compute required constructively technologic protection measures. Solution of such problems as predicting behavior and degree of reliability from external influence of a dam at given expected deformations, - can be brought into action. Prediction of conventional dams reliability may been carried out without underworking.

Protection Parameters against the Cracks by the Method of Volume Compensation Dam

“…Then, with the growth of the deformation of the earth surface at the crest will be set a new high elongation strain, which have been also repaid (compensated) stemming piles of the second period of strain [18][19][20][21].…”

Calculation the options of cracks in the earth dam

“…Average cracking step in analogy with the width of prism the active collapsing soil is determined based on the data [20] by one of the following expressions a c =h c.lim ·η a ·ξ rg , (9) ψ m ·h c.lim at ℎ < h c.lim (10) Where: h ୡ.୪୧୫ −maximum depth of crack propagation, η ୟ -coefficient which takes into account the widely observed random factor (scatter) in the formation of cracks, expressed in a significant natural irregularities of the distance between them (approximately 1 ... 2), ξ ୰ -function unloading solid ground in the event of a crack in it, taken as a ξ rg =tgβ a (11) Where: β ୟ -active caving angle of soil, ψ ୫ -coefficient which reflecting layer monolithic taken equal to 1, 2 ... at the transition from unconsolidated soil to little connected dense soils, given that individual rocks to approximate an average of the cubic form, h ୪ -thickness of the layer of soil (for example dams or soil impervious element) [21][22][23][24].…”

“…Where: ε * -most importantly elongation, χ -deviation in terms of a crack, H ୢ -height of the dam, B ୰ -width of the dam, m и m ୌ -foundations, the upper and lower slope, θ -the angle of deflection of the main extension at longitudinal axis of the dam [18][19][20][21][22][23][24][25].…”

Assessment of slope stability

“…Currently, there are several methods of calculating slope stability [3][4][5]. Most often there are the methods based on the assumption that failure occurs towards slip surface.…”