The Model Test Study On Uplift Mechanism For The Foundation Of Cable Linking With Concrete Slabs-Ball

The distribution of Sandy soil is very extensive in the western region of our country,and the ground features of western desert region put forward a severe challenges on large capacity and long distance power transmission, there is an urgent need to develop and research a new kind of basis so as to adapt to the region’s bad geological environment and complex engineering requirements, foundation of cable linking with concrete slabs-ball is a unique base type that conform to the needs of the development.By means of making survey on a lot of literature that we found predecessors had made research on ultimate anti uplift capacity of anchors plates foundation in sandy soil foundation by theoretical calculation, numerical simulation and indoor model test methods while has no involve in the drawing mechanism and ultimate anti uplift capacity to foundation of cable linking with concrete slabs-ball.We confirmed physical and mechanical parameters of the soil we study through field investigation and in situ test, prepared the similar material according to the similarity theorem, then using the self-made model test chamber and conduct the indoor similar model test to make the research of ultimate anti uplift capacity to the foundation of cable linking with concrete slabs-ball in unsaturated sand, and using the FLAC3 D to make the numerical simulation analysis of test results at the same time.(1) The preparation of the sandy soil similar material is based on that the theory cohesion of sandy soil is 0,so we only consider the soil compression modulus in preparation procedure, but we found in the preparation process of sand with different moisture content has a different sizes of false cohesion, so we considering the influence on the false cohesion in preparation procedure.(2) Through experiment it is concluded that the change of the buried depth of foundation has a greater influence on foundation uplift resistance than the change of ball diameter, while the change of the soil-cement column’s diameter have little influence on the sphere pull out bearing capacity.(3) It is calculated out that with the increase of buried depth, the uplift bearing capacity coefficient of foundation increases at first and then decrees, and the uplift bearing capacity coefficient increasing with the increase of cement-soil column diameter, and the uplift bearing capacity coefficient will decreases with the increase of the ball diameter.(4) The radius of surface damage decreased when the buried depth, the diameter of cement-soil column and the ball diameter increased.(5) Make the analysis with field test data and numerical simulation, we found that we have a consistent load- displacement curve with the different buried depth, cement-soil column diameter and the diameter of sphere, it prove the rationality of test and we using the numerical to do a further analyses of the burial depth.