Study of Adaptation to Base of CSG Dam

Abstract

CSG material was used in low dam and embankment in aboard and home. Considering of the new building material and economic aim, the study of adaptation to base of CSG dam is very important. The CSG material and base was looked as continuous material. The ratio of CSG's elastic model to base's was used to indicate the difference of base. YUMAOHONG twin shear stress criterion was used as criterion function. M any times FEM calculation was done. The result shows the relation of stress, displace and criterion value to the ratio of CSG and base's elastic model respectively. The key place (or danger place) was founded. Through anglicizing the stress, displace and criterion value of key place, some useful conclusion was draw. I ntroduction CSG (Cemented Sand and Gravel) is a kind of new material in 1976 J.M. Raphael proposed , which is to add a cementations material and water to the riverbed gravel or excavation waste material these easy to find rocky substrate material which is in the vicinity of the dam site, And then mixing with a simple device obtained by mixing (1-3) . CSG material properties is between rockfill material and concrete performance , compared with r ockfill material has better strength and resistance to erosion, overflow capacity, but compared with the concrete its strength, consistency and impermeability worse. CSG technology has local resources, make full use of local materials and conventional construction equipment, and shorten the construction period, the advantage of reducing the project cost. The technology came not long, is currently used for the construction of the cofferdam, silt detention dams and other small temporary buildings. Since it is mainly used for temporary s tructures, economic considerations, and often do not want to do too much into the foundation, therefore, it is n ecessary to study the situation of the effects of the different foundation of the dam. As is well known, the displacement field and stress field of the dam and the foundation is a function of the ratio of elastic modulus of dam and foundation. Therefore, according to the dam and foundation elastic modulus ratio is different, research dam and foundation displacement field; stress field changes can achieve the research purposes of adaptability of CSG dam foundation.