The Experimental Study Of Cap-pile Groups-Soil Interaction

Presently the designing method adopted popularly in engineering field for tall buildings is to calculate the superstruc -ture, foundation and soil separately. For pile-group foundation, designers often assume that the building loads all supported by pile stakes, they reckon the number of the pile stakes according to experienced formula which specification afforded or single pile stake bearing capacity based on experimental of dead load. The furnish of pile is adjusted accounted through characteristic of inequable of construct load in order that every pile stake play a fully role in. Furthermore, the calculation of pile group foundation doesn't take undertaking of cap and soil between the pile stake into account. This segregation cannot conform to the reality and it could make the designing plan wasted. With the development of modelabout calculation of pile group foundation, researcher try to find thenew design method to replace the conventional design method. But the advisable design method is based on understand -ing about mechanism of the interaction among the pile and the cap & the soil. In coordination with the tests on site and analysis of theory, the essay sets forth the mechanism of the interaction among the pile and the cap & the soil of tall buildings. The distribution rule of the force between cap and soil in pile-cap foundation is saddle shape along its axis. A empirical formula estimating the proportion of load carried by piles and cap in this area is presented. Furthermore, through tests of axis force of pile, the rule of load transference of pile is summarized. Eventually the interaction among pile and soil and cap is analyzed by contrasting different manner of settlement.