Calculation method for anti-overturning stability of double-row piles supporting structure

Abstract

The invention relates to a calculation method for anti-overturning stability of a double-row piles supporting structure. As for the double-row piles foundation pit supporting structure (including a front row pile 1, a back row pile 2, a pile top connecting beam 3, and earth among piles 4), a calculation method for anti-overturning stability of the double-row piles supporting structure taking compression resistance, anti-pulling force couple and groundwater buoyancy into consideration. A corresponding analytic expression is deducted. The method helps overcome defects such as too long piles and engineering waste caused by a conventional industry standard technical regulations of building foundation pit shoring JGJ 12-2012 and a anti-overturning calculation method in DB42 / T159-2012 technical regulations of foundation pit engineering in Hubei Province. The engineering projects shows that with the safety coefficient of the anti-overturning stability of the double-row piles supporting structure calculated by the method is increased by 20%-55% compared with the existing standard; and the calculation method is high in reliability, reasonable in result, easy and feasible and low in calculation cost and economic and reasonable in design scheme.

Description

technical field [0001] The invention relates to a method for calculating the anti-overturning stability of a double-row pile support structure, which is suitable for calculating the anti-overturn safety factor of a foundation pit engineering supported by a double-row pile. Background technique [0002] Compared with the cantilever-supported single pile, the double-row pile support system has the advantages of large overall rigidity, small pile top displacement, and can automatically adjust the internal force of the structure itself to keep it stable and safe under complex and changeable external loads. When the excavation depth of the foundation pit is large or the soil layer of the site is weak, and the bending stiffness of the cantilever-supported single pile cannot meet the deformation control requirements, the double-row pile support system is often used. Using the calculation methods in the current industry standard "Technical Regulations for Building Foundation Pit S...

AI Technical Summary

Problems solved by technology

Using the calculation methods in the current industry standard "Technical Regulations for Building Foundation Pit Support" JGJ120-2012 and Hubei Province "Technical Regulations for Foundation Pit Engineering" DB42 / T159-2012, the overturning safety factor of the double-row pile anti-support structure often appears Smaller, does not meet the requirements of the code, the length of the double-row piles needs to be increased, but the overturning damage of the double-row piles in actual engineering is very seldom

Therefore, the anti-overturning safety calculation method of the double-row pile support structure in the current industry standard "Technical Regulations for Building Foundation Pit Support" JGJ120-2012 and Hubei Province "Technical Regulations for Foundation Pit Engineering" DB42 / T159-2012 is used to meet the specifications requirements, but it is necessary to increase the length of double-row piles, which will inevitably cause waste. It is necessary to improve the calculation method of the anti-overturning safety factor of double-row pile support structures in the existing codes.

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