Soft foundation treatment method employing 'cutting drainage deep-layer preloading and dynamic consolidating'

Abstract

The invention relates to a soft foundation treatment method employing 'cutting drainage deep preloading and dynamic consolidating'. Water sealing, strong drainage, deep-layer vertical discharge system, vibrating compacting or dynamic compaction are organically combined to reduce an additional load formed by the ground water level of a deposal field, so as to carry out deep preloading on a soft substratum, finish consolidation of a soft soil layer and remove sedimentation of a soft substratum; compactness and physical and mechanical indexes of a shallow sediment are improved by organic combination of dynamic consolidation and cutting drainage, and the capacity requirements on the field are met. The method comprises the following construction implementation processes of: 1) punching a waterstop curtain and a strong drainage system, reducing the ground water level and the moisture content of a soil body; 2) punching a vertical drainage channel penetrating a silt seam, carrying out the deep-layer preloading and removing the sedimentation; 3) carrying out the dynamic consolidating, so that the compactness and the physical and mechanical indexes of the shallow sediment are improved, and the capacity requirements on the field are met. According to the method, the problems and the defects in the prior art are overcome, and the soft foundation treatment method has the characteristics that the schedule is short, the construction cost is low, the process is simple, the quality is controllable and the difficulty of deep-layer silt engineering can be solved.

Description

technical field [0001] The invention relates to a soft ground treatment method, which can be applied to large-area loading areas, ground treatment with deep and soft underlying layers formed in recent land areas, road subgrade treatment, and ground treatment of airports, port terminals and other projects. Background technique [0002] The coastal areas and the rivers are basically geological conditions of marine subsidence facies and fluvial subsidence facies. The silt layer is relatively thick, generally more than 15 meters. The silt layer has the characteristics of poor soil permeability, high water content, and poor structure. Generally, the elevation of these areas is low, and backfilling is required. Therefore, the foundation site must also meet the post-construction requirements. The requirements of the two indicators of settlement and bearing capacity. [0003] At present, deep foundation treatment methods at home and abroad include: 1. Vacuum preloading and vacuum c...

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Problems solved by technology

[0006] Plastic drainage board + dynamic compaction: Using dynamic compaction as an additional load, this method needs to avoid the phenomenon of "rubber soil" in soft soil, so the dynamic compaction has a long stop time and a long construction period, and has almost no effect on the treatment of deep and thick silt

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