Study On The Stress And Stability Of The Cemented Sand & Gravel Dam Base On Strength Reduction Method

It is two kinds of main dam types of the dam engineering to roller compacted concrete dam and concrete faced rockfill dam nowadays. Both of them reflected the pattern of influencing each other and mutual promotion in dam material, structural design and construction method of dam construction technique. As a new kind of dam type, cemented sand & gravel dam has produced and developed ,which integrated excellences of dam material, structural design and construction method of roller compacted concrete dam and concrete faced rockfill dam.As to a new kind of dam type, its intensity & stability is the first and important issue. This thises study the intensity & stability of cemented sand & gravel dam by adoption strength reduction coefficient method and ansys parameter design language.The key technique of cemented sand & gravel dam is to mix appropriate amount water, appropriate amount cement and natural sand & gravel material ,then to use building a dam directly, build up a high security dam.From the essential general, as roll compacted concrete, sand & gravel material is rolled material,which has structure and constructing weak layer. The properity of cemented sand & gravel is between roller compacted concrete and earth and rock material,and it is influenced by many factors easily,such as cement content, water content, Aggregate gradation, layer treatment of construction and so on.The safety evaluation of cemented sand & gravel dam involving include two respects, stress intensity and stability against sliding. Through reducing intensity index or increasing load, it can study destructive process of dam body by applying elastic plasticity Finite element method , and it can assess security of dam body by integrating stress intensity and stability against sliding The stress & stability of Cemented sand & gravel dam is a controlling factor of the safety and economic.On the other hand,it is also a precondition to seepage prevention structure work normally.Contraposing the characteristic of weak layer of cemented sand & gravel material, the paper derive equivalently Calculate formulae for body including weak one, applying the Principle of Equivalent Deformation. According to result of calculation, its computing technology is suitable .Contraposing special structure of cemented sand & gravel ,this tractate study on condition of dam foundation.which suitable for finite element are analysis of stress & stability to cement sand & gravel dam . Studies have shown , the transformation of dam foundation influence analysis trivially when the bound of dam foundation is lengther than 2.5 times the high of cement sand & gravel dam.and the border knuckle joint of dam foundation is restrained.This peper study sensation of cohesion , friction angle and Young's modulus of noumenonn material and aspect material. According to analysis result, as the accretion of intensity of cement sand & gravel material, it will augment the security of dam body . The impact on dam of the material parameter has nothing in common with each other.It is a important factor for modulus of elasticity of dam foundation to influence stress & stability analysis of cemented sand & gravel dam . This text study sensation of modulus of elasticity of homogeneous dam foundation and nohomogeneous dam foundation. According to analysis result, cement sand & gravel dam adapt to the weak dam foundation ; as the accretion of modulus of elasticity of dam foundation , it will augment the security of dam body; exert a tremendous influence to cement sand & gravel dam; Compare, the front part weaker dam foundation is more favorable.