1. High-water-level soft soil foundations: where is the difficulty?

  In China's riverine, coastal, and lake areas, soft soil foundations with high groundwater levels and high moisture content are widely distributed. This type of soil has high water content, high void ratio, low strength, and high compressibility. If construction is carried out directly on it, excessive settlement, uneven settlement, or even instability can easily occur — buildings will crack, roads will sink, and sites will subside.

To reinforce such foundations, there is only one core contradiction: water. When there is too much water in the soil, the pore water pressure is high, and the effective stress between soil particles is low, so the foundation naturally cannot "stand firm."

2. Dynamic compaction: using a "heavy hammer" to compact the foundation

  Dynamic compaction (dynamic consolidation) is a mature international ground treatment technology: a crane lifts a compaction hammer weighing dozens of tons to a height of more than ten meters or even higher, then releases it to fall freely, using enormous impact energy to compact the ground. Powerful shock waves penetrate into the ground, causing soil particles to rearrange and voids to compress, so the soil mass is compacted and consolidated, greatly improving the bearing capacity of the foundation.

  However, dynamic compaction is very effective for "drier" soils but tends to fail on saturated soft soils: the pores of saturated soil are completely filled with water, and during compaction the impact energy is "dissipated" by the water, while the pore water cannot drain out. Excess pore water pressure cannot dissipate in time, so the soil mass not only fails to compact but also experiences hammer pit rebound and surface mud boiling — commonly known in the industry as "rubber soil." The effort is wasted, and the effect is nil.

3. Dewatering-assisted dynamic compaction: first "drain the water out," then "apply the force precisely"

  This leads to the core concept of dewatering-assisted dynamic compaction — first dewater, then compact.

  Step one: use well points or deep wells to lower the groundwater level, drain the free water in the soil mass, and create drainage channels for the soil;

  Step two: then perform dynamic compaction. At this point, the soil mass is close to an unsaturated state, and the impact energy generated by compaction can be effectively transmitted to deeper layers. Pore water drains rapidly through the dewatering wells, excess pore water pressure dissipates quickly, and the soil mass is truly densified and consolidated.

  In simple terms: dewatering solves the "water" problem, and dynamic compaction solves the "force" problem. Only by combining the two can a high-water-level soft soil foundation be truly compacted.

4. Deep rapid dewatering dynamic consolidation method: specifically solving "deep-layer" challenges

  Traditional dewatering-assisted dynamic compaction is clearly effective for shallow soft soil, but it often falls short when faced with deep soft soil layers of ten to twenty-plus meters thick — deep water cannot be fully drained, energy cannot be transmitted, and the reinforcement depth is limited.

  The patented "Deep Rapid Dewatering Dynamic Consolidation Method" independently developed by the company is precisely aimed at this pain point:

  Deep dewatering: arrange a deep well dewatering system to rapidly lower the deep groundwater level, creating drainage conditions for dewatering the deep soil mass;

  Dynamic consolidation: combined with high-energy-level dynamic compaction, the impact energy acts on the deep soil mass, and with drainage channels, the deep soft soil is rapidly consolidated;

  Fast and efficient: the dewatering and dynamic compaction processes are orderly connected and tightly organized, significantly shortening the construction period and saving costs.

  This technology has been applied in multiple high-water-level soft soil foundation projects, providing reliable ground treatment solutions for airport roads, port and shipping terminals, and other projects.

5. Applicable scenarios

  Dewatering-assisted dynamic compaction is widely used for high-groundwater-level soft soil foundations in riverine, coastal, and lake areas, large-area site foundations for airports, roads, wharves, warehousing and logistics, as well as complex geological conditions such as deep soft soil, dredger fill, and mucky soil.

  For high-water-level soft soil foundation treatment, both "water" and "force" are indispensable. Dewatering-assisted dynamic compaction precisely combines "water management" with "compaction" — first dewatering and draining, then dynamic consolidation, turning the foundation from "soft" to "hard" and from "unstable" to "firm." Hubei Junhui Geotechnical protects every foundation project with its independently developed patented technology.