Long and narrow foundation pit anti-surge calculation method

Abstract

The invention relates to a long and narrow foundation pit anti-gushing calculation method, which introduces a mutation theory on the basis of the traditional foundation pit gushing theoretical calculation, and fully considers the strain energy effect of a waterproof clay layer. According to the method, the inrush failure model of the instability failure of the waterproof clay layer at the bottom of the foundation pit is specifically analyzed, the inrush mutation model of the key layer at the bottom of the pit is established by introducing the energy balance method according to the cusp mutation theory and model characteristics, and the dead weight of the soil body at the bottom of the pit is considered in analysis and calculation; and the bending elastic strain energy effect of the clay water-resisting layer is also fully considered. The method is used as a supplement of a long and narrow foundation pit anti-inrush calculation theory, and the bending elastic strain capacity of the claywater-resisting layer is fully utilized to overcome the defect that conventional foundation pit anti-inrush calculation is too conservative. The theoretical model conforms to the reality and conformsto the actual engineering project field result, reasonable supplementation is theoretically conducted, the foundation pit anti-gushing measure cost is remarkably reduced, and the engineering implementation progress is improved.

Description

technical field [0001] The invention studies the anti-surge stability of narrow and long foundation pits based on catastrophe theory, and specifically provides a calculation method for anti-surge of long and narrow foundation pits, which is especially suitable for the analysis of anti-surge of long and narrow foundation pits containing a water-resistant clay layer at the bottom. Background technique [0002] In recent years, domestic municipal engineering construction has developed rapidly, accompanied by increasing investment in construction. However, since the foundation pits of municipal engineering are generally narrow and long, the current normative method for the anti-surge analysis of such foundation pits ignores the shape characteristics of the long and narrow foundation pits. Especially in coastal soft clay areas, according to a large number of engineering practices, the calculation of the standard method is too conservative because it fails to fully consider the sp...

AI Technical Summary

Problems solved by technology

However, since the foundation pits of municipal engineering are generally narrow and long, the current normative method for anti-surge analysis of such foundation pits ignores the shape characteristics of long and narrow foundation pits

Especially in coastal soft clay areas, according to a large number of engineering practices, the calculation of the standard method is too conservative because it fails to fully consider the spatial shape effect of foundation pit excavation and unloading, and cannot obtain economically reasonable calculation and analysis results. Beneficial effects are not fully recognized

[0003] The traditional anti-surge calculation of the bottom of the narrow and long foundation pit only considers the self-weight of the soil, but does not fully consider the shape characteristics of the long and narrow foundation pit

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