Method for reducing side friction of pile foundation

Abstract

The invention provides a method for reducing side friction of a pile foundation. The method comprises the following steps of: S1, a plurality of isolation pile casing sections are manufactured, and anasphalt coating is pasted on the inner wall of each isolation pile casing section; S2, all the isolation pile casing sections are sequentially connected in a welded mode to form an isolation pile casing, the isolation pile casing is placed in a pile hole, a gap exists between the outer wall of the isolation pile casing and the inner wall of the pile hole, and the pile hole is vertically formed, penetrates through the slope body of a side slope and extends downwards into a stable stratum; S3, a concrete fixing layer is poured on the part, located in the stable stratum, of the gap, a gravel filling layer is filled in the space, on the concrete fixing layer, in the gap, and a flexible material filling layer is filled on the gravel filling layer; and S4, steel reinforcement cage welding and aconcrete guide pipe are arranged at the upper end of the isolation pile casing, pile body concrete is poured into the isolation pile casing, and a pile foundation is formed. The method has the beneficial effects that the load borne by rock-soil mass on the upper portion of the side slope is reduced, the situation that the side slope is difficult to reinforce is avoided, and side slope instability, large deformation, collapse and other disasters are prevented.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for reducing lateral frictional resistance of pile foundations. Background technique [0002] The rapid development of my country's national economy requires the construction of a large number of roads and bridges, high-rise buildings and other projects in the fields of transportation, water conservancy and hydropower. Due to the needs of site selection, when the pile foundation may be located on the slope, during the process of the upper vertical load being transmitted downward through the pile, the rock and soil on the upper part of the slope will be affected by the side friction of the pile. Because there may be a potential sliding surface on the high and steep slope, the side resistance of the pile on the slope will have an adverse effect on the stability of the slope, and even the side resistance of the pile to the surrounding soil will be too large...

AI Technical Summary

Problems solved by technology

Because there may be a potential sliding surface on the high and steep slope, the side resistance of the pile on the slope will have an adverse effect on the stability of the slope, and even the side resistance of the pile to the surrounding soil will be too large, causing the slope to become unstable. Difficult reinforcement conditions can lead to accidents such as slope instability, large deformation, landslides, etc.

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