A calculation method of horizontal loading force of single pile during static load test of fan

Abstract

The invention discloses a method for calculating the horizontal loading force of a single pile during a wind turbine static load test, comprising the following steps: Step (a), calculating the pile body bending stiffness EI, pile diameter d, and calculated width b 0 And the horizontal force H at the top of the single pile under the normal operation condition of the wind turbine ik , using EXCEL to calculate the pile top horizontal displacement coefficient ν x Data fitting with pile conversion buried depth αh; step (b), find the variable m 0 The eigenvalue R of the single pile horizontal bearing capacity ha0 ; Step (c), let R ha0 Take down the limit H ik , using EXCEL to calculate the proportional coefficient m of the horizontal resistance coefficient of the pile side soil under the normal operation condition of the fan 0 ; Step (d), draw the scale coefficient of the horizontal resistance coefficient of the pile side soil under the static load test working condition to be m 1 = m 0 / 0.4=2.5m 0 ; Step (e), according to the fan is sensitive to horizontal displacement (allowable horizontal displacement χ 0a The value is 6mm), and the lower limit value F of the single pile horizontal loading force under the static load test condition is obtained 1,min =R ha1 / 0.75. The invention provides a method for calculating the horizontal loading force of a single pile during a static load test of a fan, which is simple in operation and easy to realize.

Description

technical field [0001] The invention belongs to the design field of test piles for wind turbines in wind farms, and relates to a method for calculating the horizontal loading force of single piles during static load tests of wind turbines. Background technique [0002] As wind turbine hubs and impeller diameters used in wind farms are getting higher and higher, the design requirements for wind turbine foundations are also getting higher and higher. The rationality of the calculation of the horizontal loading force before the working condition has become one of the important factors affecting the equipment and test methods of the relevant units, as well as the design and safe operation of the fan foundation in the later stage. At present, the strength and stiffness of wind turbine foundation piles are relatively good. The main consideration is that the horizontal displacement of the soil on the side of the pile is too large to damage. The conventional method is to make the ho...

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Problems solved by technology

The disadvantage of this method is that it ignores the difference between the horizontal resistance of the pile side soil under the static load test condition and the normal operation condition of the fan. The horizontal load acting on the single pile under the working conditions is a long-term and frequently occurring load. The proportional coefficient of the horizontal resistance coefficient of the pile side soil under these two working conditions is quite different, and the horizontal resistance coefficient of the pile side soil is m 0 is the former m 1 As a result, the horizontal bearing capacity of the single pile meets the requirements during the horizontal dead load test, but the horizontal bearing capacity does not necessarily meet the requirements under the normal operating conditions of the wind turbine. This is one of the important factors that seriously affect the safe operation of the wind turbine.

At the same time, the horizontal resistance coefficient of the pile side soil given in the code is a range value, and the inaccurate value will also lead to a large deviation in the calculation of the horizontal loading force of the single pile

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