Liquified sand foundation anti-vibration processing method

Abstract

The invention relates to an earthquake-proof processing method for a liquefiable sandy soil foundation. The method adopts the technical proposal that: the technological flow of the method for integrating dynamic vibration and static loading is as follows: the dynamic vibration method is utilized to perform construction on a reinforced vertical displacement hull on the liquefiable sandy soil foundation and the static method is utilized to perform loading and prepressing. Firstly, a sand cushion is laid on the surface of the liquefiable sandy soil foundation to be as an external drainage channel of the vertical displacement hull for drainage; secondly, the type and the distribution of the reinforced vertical displacement hull are worked out, and the diameter and the space of a sleeve of the reinforced vertical displacement hull and the diameter of a sand well are determined; thirdly, the reinforced vertical displacement hull is drilled into the liquefiable sandy soil foundation; fourthly, the static method is utilized to perform loading and prepressing; and finally, loading and prepressing raw materials can adopt materials such as sand, stones, soil and so on, and the loading height depends on factors such as the properties of liquefiable sandy soil, the engineering properties, the engineering earthquake resistant design requirements and so on. The method has the advantages that: the earthquake resistance of the liquefiable sandy soil foundation is improved; the environmental pollution is reduced; and the construction cost is lower.

Description

technical field [0001] The invention relates to an anti-seismic treatment method for foundations, in particular to an anti-seismic treatment method for liquefiable sandy soil foundations, which uses a combination of dynamic vibration and static surcharge to improve the anti-seismic capability of liquefiable sandy soil foundations . Background technique [0002] At present, the commonly used anti-seismic treatment methods for liquefiable sand foundations are: dynamic compaction method, vibrating gravel pile method and compacted sand pile method. The problems and defects of these methods are as follows: [0003] The dynamic compaction method, also known as the dynamic reinforcement method, often applies an impact load to the foundation soil with an impact energy of 500-800kNm, which generates a large shock wave and dynamic stress in the foundation, so that the strength of the soil is improved, the compressibility is reduced, and the vibration liquefaction condition can be achi...

AI Technical Summary

Problems solved by technology

The method of compacting sand piles is widely used because of its flexible use, simple equipment, economy, and strong adaptability to terrain fluctuations. However, in the process of compacting soil into piles, excess static pore water pressure will be generated, especially in liquefiable sand piles. When the soil and soft soil co-exist in the formation, the phenomenon of excess static pore water pressure is quite obvious. When the excess static pore water pressure generated in the process of squeezing soil into piles exceeds the bearing capacity of saturated soil, the soil will generate A series of problems such as disturbance, uplift, and lateral movement, resulting in quality defects such as pile body fracture, necking, mud inclusion, evacuation, and hanging feet of CFG piles with low lateral shear strength, making it difficult to ensure vertical drainage The continuity and integrity of the channel will seriously affect the consolidation effect of the soil layer, resulting in low seismic capacity

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