Soft soil foundation consolidation method combining drainage pile loading prepressing and deep mixing piles

Abstract

The invention discloses a soft soil foundation consolidation method combining the drainage pile loading prepressing and deep mixing piles, which has a process that: when the soft soil foundation is needed to be consolidated, a circle of deep mixing piles are arranged at the periphery of a soft soil consolidation area at first to be used as the constraint edge of the consolidation area, a vertical drainage passage is then installed in the soft soil consolidation area, and finally pile loading is exerted on the soft soil consolidation area. After the pile loading pressing is exerted, soft earth bears the vertical loading, pore water in the soft soil flows out along the vertical drainage passage under the pressure, a soil mass undergoes drainage solidifying, and meanwhile, because of the constraint function of the deep mixing piles, the side displacement of the soil mass is limited, so the vertical sedimentation caused by the side displacement is reduced, thus the horizontal additional stress also plays the role of drainage solidifying, the drainage time of the soil mass is shortened, and the solidification and consolidation effects are improved.

Description

technical field [0001] The invention relates to a soft soil foundation reinforcement method, which can especially reduce the lateral displacement of the soft soil, accelerate the consolidation rate, shorten the construction period, and protect surrounding buildings or pipelines. Background technique [0002] At present, the drainage surcharge preloading method is one of the simplest, most economical and most reliable methods among many soft soil foundation treatment technologies. Its basic principle is to increase the pressure of the pore water in the soft soil by means of the surcharge on the ground. It is discharged in the direction of the relatively minimum pressure, causing the consolidation of the soil, thereby enhancing the strength of the soil and improving the mechanical properties of the soil. Especially for small-area stacking, because the weight of the stacked load spreads relatively small to the surroundings with depth, the stacking effect is the most effective, ...

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Problems solved by technology

[0003] In order to overcome the problem that the construction period of surcharge preloading is long and the lateral displacement weakens the soft soil consolidation effect, the object of the present invention is to provide a method of combining drainage surcharge preloading and deep layer mixing piles to strengthen soft soil foundation, which can Effectively control the lateral displacement of surcharge preloading and the resulting excessive vertical settlement and long construction period.

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