Construction method of karst cave pile foundation

Abstract

The invention relates to the technical field of bridge engineering, in particular to a construction method of a karst cave pile foundation. The construction method comprises the steps that after a mixture containing clay and rubbles is backfilled into a pile hole and is extruded and compacted, double-liquid slurry is injected into a karst cave, so that the defects that setting time of single-liquid cement slurry is long and is difficult to control, stone rate is low under flowing water condition and the like are overcome; cement grouting effect is improved, cement grouting range is expanded, a soil body can be rapidly split and solidified by combining thrown and filled clay and rubbles, and rapid leaking stoppage effect can also be achieved in a stratum with large underground water flow speed. The construction method is high in efficiency, good in effect and low in cost, the construction progress is accelerated, and the karst cave can be safely, efficiently and economically treated.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a construction method for karst cave pile foundations. Background technique [0002] When the pile foundation construction is in the karst area, after long-term geological action and the dissolution of groundwater, the bearing layer of the pile foundation rock and the soil around the pile develop different scales of karst caves, troughs, and eroded fissures. Once the pile foundation construction is carried out, it is easy to cause disturbance and damage to the geological environment, and it is easy to cause hazards such as hole collapse and even ground subsidence. For the treatment of karst caves, the method of backfilling clay and flakes to build walls is generally used to seal the karst caves. Although it has a certain effect, the backfilled karst cave soil cannot guarantee its impermeability and compressive strength, and it is easy to cause secondary collapse. Hole...

AI Technical Summary

Problems solved by technology

Once the pile foundation construction is carried out, it is easy to cause disturbance and damage to the geological environment, and it is easy to cause hazards such as hole collapse and even ground collapse.

For the treatment of karst caves, the method of backfilling clay and flakes to build walls is generally used to seal the karst caves. Although it has a certain effect, the backfilled karst cave soil cannot guarantee its impermeability and compressive strength, and it is easy to cause secondary collapse. hole or grouting of poured concrete; the method of follow-up with full casing is too costly and difficult to implement; these are undesirable for those skilled in the art

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