Composite drainage structure applicable to liquefaction resistance of sand layer with high fine grain content and construction method of composite drainage structure

Abstract

The invention provides a composite drainage structure suitable for liquefaction resistance of a high-fine-grain-content sand layer and a construction method thereof.The composite drainage structure suitable for liquefaction resistance of the high-fine-grain-content sand layer comprises a plurality of gravel piles arranged in a foundation needing to be treated and a gravel hardcore arranged on the surface of the foundation needing to be treated, and geotechnical drainage assemblies are arranged in the gravel piles; the top end of the geotechnical drainage assembly is inserted into the broken stone hardcore, the geotechnical drainage assembly comprises a drainage pipe and geotechnical cloth wrapping the outer side wall of the drainage pipe, and drainage holes are formed in the drainage pipe. The method is low in cost and good in durability, and the drainage capacity cannot be affected by sand layer particle clogging.

Description

technical field [0001] The invention belongs to the technical field of foundation treatment, and in particular relates to a composite drainage structure suitable for anti-liquefaction of sand layers with high fine grain content and a construction method thereof. Background technique [0002] The traditional anti-liquefaction foundation treatment of sandy soil generally adopts dynamic compaction methods, such as dynamic compaction or vibro-shock compaction. However, the dynamic compaction method has certain applicability in the reinforcement of sand layers with high fine-grained content. For example, the vibro-consolidation method is only suitable for sandy soil foundations with fine-grained content (particle size less than 0.075mm) not greater than 15%; Although the treatment is suitable for sandy soil foundations with a relatively high range of fine grain content (30% to 40%), the reinforcement depth generally does not exceed 10m. Therefore, for liquefiable sand layers wit...

AI Technical Summary

Problems solved by technology

In practical engineering applications, the commonly used vertical drainage channels are mainly gravel piles, which have good durability, but the cost is high, and during the pile formation and long-term service process, sand particles in the formation will produce siltation under the change of water level , resulting in a reduction in the drainage capacity of the gravel pile

At present, gravel piles are mainly used as drainage channels for high-fine-grained sand layers, but the cost of gravel materials is high, and the drainage performance will be greatly reduced during long-term use; if drainage pipes are used as drainage channels, the cost is lower, and the hollow The drainage pipe can ensure a constant drainage section during long-term use, but the service life of the drainage pipe material is short, and there are durability problems

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