Test device for researching influence of interval between enlarged ends on bearing capacity of base-enlarged uplift pile

Abstract

The invention relates to an experimental device for researching the effect of enlarged head spacing on the bearing capacity of bottom-expanded uplift piles. The top surface of the model box is set as an opening to facilitate the installation of a vertical static load test device; ten sets of strain gauges are pasted on the outer wall of the pile foundation model , the pile foundation model is placed in the middle of the model box, and several expansion heads are installed on the outer wall of the pile body model near the bottom; the vertical static load test device is placed on the top surface of the model box, fixed in the horizontal direction, and can be adjusted in the vertical direction . The uplift deformation side system of the tester can realize the measurement of pile foundation settlement. Through simple method and simple experimental equipment, the present invention can conveniently and effectively simulate the change of the bearing capacity of the uplift pile with the change of the spacing or the number of the expansion heads, and compare the bearing capacity of the single expansion head and the double expansion head uplift pile respectively. When the effect and the distance between the double expansion heads are changed, the optimal pull-out bearing capacity is searched, which provides a better pull-out effect in the actual project and ensures the smooth progress of the construction.

Description

technical field [0001] The invention relates to a pile foundation test device, in particular to a test device for researching the influence of different distances between expansion heads on the bearing capacity of bottom-expanded uplift piles. Background technique [0002] With the rapid development of my country's economic construction and industry, the contradiction between urban construction and land resources has become increasingly prominent, and the use of underground space has received more and more attention. Especially in my country's coastal areas, the groundwater level is relatively high, and underground buildings usually require withstand enormous buoyancy forces. There are more and more situations where buildings (structures) bear uplift loads. The piles that bear the uplift load or the vertical uplift force in engineering are called uplift piles, and the uplift piles are widely used in engineering as one of the main forms of uplift foundations. In engineering ...

AI Technical Summary

Problems solved by technology

The theoretical analysis method uses the theory of elasticity and simplifies the research model through assumptions, but to a certain extent, it cannot accurately consider the complex relationship between piles and soil, and the amount of calculation is large; the numerical simulation method generally requires the use of large-scale commercial software, and the numerical model Complicated and time-consuming to set up

In addition, due to the limitations of geotechnical testing equipment, it is difficult to obtain accurate soil physical and mechanical parameters, and changes in soil parameters have a great impact on numerical simulation results, so it is easy to cause deviations in calculation results

On-site monitoring method is one of the means to obtain the bearing capacity data of uplift piles with different enlarged head spacings. However, due to the limitations of equipment and human observation factors, the on-site test results have certain deviations. At the same time, on-site monitoring requires a certain amount of manpower and material resources. On-site pre-embedded test components are very easy to be damaged during construction, thus delaying monitoring or even obtaining wrong monitoring information

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