Method of deep foundation pit excavation

Abstract

The invention provides a method of deep foundation pit excavation. The method comprises the following steps that a standard safety factor of a to-be-dug soil slope is acquired, and an instability sliding curve is preset on the to-be-dug soil slope; the minimum safety factor is calculated according to the instability sliding curve; whether the minimum safety factor of the instability sliding curveis larger than the standard safety factor or not is judged; if so, excavation is conducted according to one side of the instability sliding curve; and if not, the instability sliding curve is preset again. The problems that the cost of a pit support structure needed to be formed is high, and collapsing occurs when excavation is conducted directly are solved. The minimum safety factor is calculatedaccording to the preset instability sliding curve of the dug soil slope due to the fact that stability loss of an average slope, and a sliding surface is a curve surface, the minimum safety factor ofthe instability sliding curve is larger than the standard safety factor, excavation is conducted according to the inner side of the instability sliding curve, the problem of collapsing on the soil slope does not occur, it is guaranteed that deep foundation pit construction excavation is safely and fast conducted, the working efficiency is high, and the economic cost is low.

Description

technical field [0001] The invention relates to the technical field of engineering construction methods, in particular to a deep foundation pit excavation method. Background technique [0002] When excavating deep foundation pit construction, there are mainly the following two methods: [0003] The first type: the foundation pit enclosure structure needs to be formed once before the excavation of the foundation pit. After the enclosure structure reaches the design strength, the foundation pit is excavated. The soil around the foundation pit is not pre-reinforced, so it cannot be excavated Structure, targeted adjustment of the enclosure structure, economy and reliability cannot be taken into account; and the following problems still exist in the traditional enclosure structure: the depth of the enclosure structure is much greater than the excavation depth of the foundation pit; the opening of the enclosure structure, the grooved wall The required mud is likely to cause envir...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for excavating a deep foundation pit to solve the problem in the prior art that the construction and excavation of deep foundation pits need to be used as a foundation pit enclosure structure and the cost is high, and the problem of collapse occurs in direct excavation

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