Vibration-immersed tube crushed stone pile method is a method that uses vibration-immersed tube to form holes, and adds hard particles to the tube, and forms crushed stone pile to treat the foundation by pulling out the tube and vibration densityLarge diameter vibrating immersed tube rubble pile The pile diameterCan be up to1200mm, pile length can be reached40mThe above.
applyinFoundation treatment works with the main purpose of eliminating liquefaction;Road, yard, revetment, wharf and other foundation treatment works with the main purpose of improving the bearing capacity of the foundation;Foundation treatment works with the main purpose of enhancing the overall stability of soil slope and foundation.
1,Reinforcement mechanism of liquefiable sand and silt
Vibrating immersed tube gravel pileThe main purpose of strengthening sand and silt foundation is to improve the bearing capacity of the foundation soil,Reduce deformation and enhance liquefaction resistance.
Vibrating immersed tube gravel pileIn the process of pile formation, pile pipe has great lateral extrusion pressure on the surrounding sand and silt soil,The pile tube volume of soil is pushed into the soil layer around the pile tube,The soil porosity around the pile tube is reduced and the density is increased.
(2)Drainage depressurization effect
Vibrating immersed tube gravel pileWhen strengthening the sand,The pile hole is filled with coarse granular material with good filtration performance(Gravel, gravel, pebbles),The artificial vertical drainage and depressurization channel with good permeability is formed in the foundation,It can effectively dissipate and prevent the increase of excess pore water pressure,Prevent liquefaction of sand and silt,Accelerate drainage consolidation of foundation.
(3)Preliminary effect of vibration
Vibrating immersed tube gravel pileWhen forming holes and piles,The strong vibration of the vibration hammer makes the filling material and the original Ledong soil of the foundation get strong pre-vibration effect while being crowded,It is very beneficial to enhance the anti - liquefaction ability of sand and silt.
2,Reinforcement mechanism of cohesive soil
Vibrating immersed tube gravel pileThe main purpose of strengthening cohesive soil foundation is to improve the bearing capacity of foundation soil, reduce the settlement of foundation, improve the shear strength of soil, and increase the anti-slip stability of soil slope.
On a cohesive soil foundation,Because of the clay content of the soil,Cohesiveness between clays is strong,Low permeability,Under the action of vibration force or extrusion pressure, the water in the soil is not easy to be discharged,Therefore, the effect of crushed stone compaction pile is not foundation compaction,It's substitution.
Vibrating immersed tube gravel pileForm a good drainage channel in the clay,Played the role of drainage sand Wells,The horizontal permeation of pore water is shortened.
For shallow soft soil layer,Crushed stone compaction pile can run through the whole soft soil layer to relatively hard layer,In this case, the pile mainly plays the role of stress concentration under the action of load,The bearing capacity of the foundation is increased and the compressibility is reduced.
When the soft soil layer is thick,Crushed stone compaction piles do not pass through soft soil,The reinforced composite soil layer formed at this time plays the role of cushion,The cushion spreads the load,The stress distribution tends to be uniform,Thus, the purpose of improving the bearing capacity of foundation and reducing the settlement is achieved.
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