| Belled pile is a relatively new type of pile having a reinforcement effect, a small settlement after construction, lateral deformation good uplifting, etc., in soft ground reinforcement works have been widely applied. At present, domestic and foreign scholars and expanding bottom pile studies, mostly in construction engineering technology introduction and summary, or is based on field trials and bearing properties model test, but for solid belled piles and the like conventional diameter solid Comparative experimental study of model piles, as well as small experimental study compared the model with other conventional belled pile pile diameter involved, the existing experimental study for expanding bottom pile model deficiencies, the main work and results are as follows:1. Introduced at home and abroad to study the mechanism of pile foundation axial bearing properties, introduces the model test of pile foundation pile and a variety of cross-sectional type of study status quo.2. The theoretical basis of model test, model test model for me, than similar models, the loading device and loading programs, arrangements and measurement systems were piles design. Model tests on soil indoor soil test carried out to obtain the basic physical parameters of the soil. We produced a model pile and pile surface model paste test element to determine the model of the control measures laid piles and installation data acquisition system.3. In the case of the same amount of concrete and the same diameter of belled piles for equal diameter and solid pile, pile and belled pile equal diameter vertical compression were carried out model tests sort out four kinds of pile load settlement curve type, obtained for each type of pile vertical ultimate bearing capacity. Sorting out the axial force distribution, distribution and end resistance of pile friction sharing ratio, and belled piles for equal diameter and solid pile, pile and belled pile diameter vertical compression, etc. bearing characteristics were compared.4. In the case of the same amount of concrete and the same diameter of the solid belled piles and piles for equal diameter, and the like belled pile diameter pipe pile were the vertical uplift model tests sort out pull on Four types of piles of load-displacement curves obtained for each type of pile ultimate bearing capacity of vertical uplift, sorting out the distribution of the axial force, side resistance distribution. And solid belled piles and piles for equal diameter, and the like belled pile pile diameter vertical uplift bearing characteristics were compared. |
