Method for calculating transverse bearing capacity correction coefficient and bearing capacity of inclined steep slope bridge pile foundation

Abstract

The invention discloses a method for calculating the transverse bearing capacity correction coefficient and bearing capacity of an inclined steep slope bridge pile foundation. The method comprises the steps: firstly, the pile foundation bearing capacity influence degree alpha<H> (please see the specifications for the formula ) under different gradients is calculated, wherein H<0> in the formula represents the X-direction allowable bearing capacity of the pile foundation at a flat slope, and H<alpha i> in the formula represents the X-direction allowable bearing capacity of the pile foundation at the gradient of alpha i; and then according to the obtained pile foundation X-direction bearing capacity influence degree alpha<H>, the pile foundation X-direction bearing capacity reduction coefficient zeta<H> is calculated, wherein zeta<H> is equal to 1-alpha<H>. After the calculated bearing capacity is multiplied by the correction coefficient, the X-direction allowable bearing capacity of the pile foundation is closer to the actual bearing capacity of the bridge pile foundation in a steep slope area, and the incidence rate of engineering accidents is decreased.

Description

technical field [0001] The invention belongs to the technical field of civil engineering bridge design and construction, and in particular relates to a correction factor for the lateral bearing capacity of pile foundations on steep slopes and a calculation method for the bearing capacity. Background technique [0002] With the continuous development of the expressway industry, the role of bridges in highway construction is becoming more and more significant, and bridge pile foundations are one of the main foundation forms in bridge engineering. The load on the upper part of the bridge is transmitted to the foundation through the pile foundation. The bearing capacity of the bridge pile foundation is mainly provided by the pile side friction resistance and the pile tip resistance. The pile foundation bearing capacity is divided into friction piles and end bearing piles according to the share of the pile side friction resistance. When the bearing capacity of the pile foundation...

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Problems solved by technology

[0006] (1) The calculated value is higher than the actual bearing capacity, which reduces the safety factor of the bearing capacity of the bridge pile foundation on the slope and steep slope, and easily causes traffic accidents

[0007] (2) It brings difficulties to the design of bridge pile foundation. According to the calculation formula of traditional pile foundation bearing capacity, the bearing capacity is too high. There is no relatively accurate bearing capacity value, which is not convenient for pile foundation in the design process of bridge pile foundation bearing capacity. design

[0008] (3) It is easy to cause waste of materials and increase design and construction costs

In the design, according to the conventional formula, the bearing capacity is calculated to be larger than the actual one, and there is no relatively accurate value for how much it is larger, and the designer will blindly increase the size of the pile foundation, reinforcement, etc. for the sake of safety (may not be used in practice. Multi-material), it is easy to cause an increase in engineering costs

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