A Composite Seismic Isolation Foundation of Double-layer Staggered Long and Short Pile Applicable to Strong Earthquake Conditions

Abstract

The invention discloses a double-layer staggered long-short pile composite shock-isolation foundation suitable for strong earthquake conditions, specifically long piles, solidified soil cushion, composite layered reinforced cushion, fiber soil cushion, short pile type Combination structure mode of piled raft foundation and superstructure. The upper and lower long and short piles are arranged alternately in two layers. The short pile raft foundation and the long piles are not connected to each other. The solidified soil cushion, composite layered reinforced cushion, and fiber soil cushion are laid sequentially from bottom to top in the middle. The double-layer staggered long-short pile composite seismic isolation foundation provided by the invention is suitable for large-scale construction projects under strong earthquake conditions. The composite layered reinforced cushion can effectively absorb and dissipate seismic energy and prevent seismic forces. The upward transmission destroys the upper structure, and the reinforcement restricts the dispersion and dislocation of the particles of the granular material. The whole structure bears the horizontal load and resists the horizontal displacement together. It has a high bearing capacity and good shock isolation and shock absorption, even under strong earthquake conditions. Safe operation is still guaranteed.

Description

technical field [0001] The invention belongs to the technical field of foundation engineering, and in particular relates to a composite shock-isolation foundation of double-layer interlaced long and short piles under strong earthquake conditions. Background technique [0002] At present, the pile foundation isolation technology has been applied to large-scale engineering projects in many countries. Recently, studies on cushion isolation technologies such as gravel and sand have been carried out one after another, but they are rarely used in bridge engineering. In foreign countries, cushion isolation is only used in the Rion-Antirion Bridge in Greece and the Izmit Bay Bridge in Turkey. In my country, the seismic isolation technology of laying crushed stone cushion is only used between the immersed tube and the foundation of the Hong Kong-Zhuhai-Macao Bridge. [0003] According to the different isolation objects, the isolation structure is divided into three categories: founda...

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Problems solved by technology

The large damping support of soft materials is represented by rubber. Soft materials have low-rigidity elongated structures. They mainly use the characteristics that the natural vibration period of soft materials is far from the excellent period of earthquakes to isolate vibrations. Rubber isolation technology has been studied in theory and application. It is relatively mature; the low-friction support of hard materials uses the relative sliding between the upper structure of the building and the foundation under the earthquake to dissipate the seismic force, achieve the effect of shock absorption and isolation, and reflect the frictional slip characteristics of the friction material itself. The material shock-isolation cushion is laid between the superstructure and the foundation, and is mainly composed of fragmentary materials with a small friction coefficient, such as sand and stone, forming a cushion with low shear stiffness. There are still few researches on its mechanism at this stage, especially in the application and promotion of pile foundation engineering construction, there is still a lack of systematic technical and technological support

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