Anti-slide pile and its construction method for prevention and control of underwater soft soil slope landslide caused by earthquake

Abstract

The invention discloses an anti-slide pile for prevention and control of underwater soft soil slope landslides caused by earthquakes and a construction method thereof. The anti-slide pile is used for the sudden flow of easily liquefiable soft soil slopes on river alluvial plains, river estuaries and continental shelves The prevention and treatment of landslides and progressive fluidity landslides; the invention adopts the steel casing with automatic liquefaction prevention and control system, which can independently adjust the surrounding soil of anti-slide piles in the construction and operation stages of anti-slide pile foundations in easy-to-liquefy soft soil areas The pore water pressure in the water can effectively reduce the risk of landslides in the soft soil that is easy to liquefy underwater, and ensure the engineering safety of the anti-slide pile and its superstructure; If the pore water pressure in the underwater soft soil around the pile cannot cope with the rapid development of the pile top settlement or the excessive settlement of the anti-slide pile, the underwater easy-to-liquefy soft soil slope can be fully reinforced by injecting concrete grout for further comprehensive and in-depth treatment Underwater soft soil slope landslide and anti-slide pile foundation failure.

Description

technical field [0001] The invention relates to the technical field of anti-slide pile foundations, in particular to an anti-slide pile for prevention and control of underwater soft soil slope landslides caused by earthquakes and a construction method thereof. Background technique [0002] With the rapid advancement of my country's urbanization process, a large number of cross-river / river bridges, sea-crossing bridges, river / river roads, coastal roads, and a series of water (river / river or sea) viewing platforms and other engineering projects have emerged. Pile-like foundations (especially underwater bored pile foundations) have played an important role in the smooth construction and normal operation of the above-mentioned projects. [0003] Easily liquefiable soft soil slopes are widely distributed on the alluvial plains of rivers, river estuaries and continental shelves. When building buildings or structures on such slopes, it is necessary to consider the seismic design of...

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Problems solved by technology

The working principle of conventional underwater soft soil slope anti-slide pile foundation is: the pile foundation penetrates the liquefied soil layer and inserts the stable soil layer to a certain depth to effectively improve the anti-slide ability of the slope, but it is very important to prevent the soft soil slope from earthquake liquefaction and landslides. The effect of destruction is not obvious

[0004] At present, the construction of underwater anti-slide piles often uses bored pile steel casings. The installation of conventional bored pile steel casings is penetrated into underwater soft soil by means of shock vibration or hammering. This type of traditional The installation method of the steel casing will seriously disturb the soft soil around the steel casing and soften the strength of the soil; on the other hand, it will also form an ultra-static pore water pressure in the soft soil around the steel casing. If the pressure is not dissipated in time, the soil around the anti-slide pile foundation in the easy-to-liquefy soft soil area will be liquefied and damaged, which will adversely affect the stability of the underwater anti-slide pile foundation during construction and operation.

The common method of reducing the pore water pressure around the anti-slide pile foundation can prevent and preliminarily treat the underwater soft soil slope landslide or anti-slide pile damage caused by earthquake liquefaction, but it cannot deal with the irreversible large-scale underwater soft soil slope caused by strong earthquakes. Cases of deformation and excessive displacement of anti-slide piles

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