The understanding of the subgrade slumping treatment, waiting for strength recovery to continue to follow the original design and construction methods, although successful, but there are also drawbacks: First, the long interval, the overall duration of the control is more unfavorable; Second, the bag of sand wells To improve the overall anti-slip effect is not obvious, the sliding surface has not been effectively dealt with, and there are still hidden dangers in the subgrade filling period. In several quick-fixing soft foundations, the price is relatively cheap and has been rapidly promoted. The scope of influence is related to the permeability coefficient of the soil, the permeability coefficient has a large influence range, the permeability coefficient is small, and the impact scope is small. Great care must be taken in the construction of the roadbed in the future. In addition, if the interval time is not well mastered, slipping again will waste a lot of valuable time.
Therefore, we believe that when conditions permit, it is recommended that such problems be treated as FCB piles as possible. Through cement or other colloidal materials to improve the physical and chemical properties of silt and silty soil, improve the soil strength and bearing capacity, and cement and soil piles as a root anchor pile to connect the upper and lower soil layers as a whole, can make Its anti-slip effect is greatly improved.
After fully learning lessons learned from the port interchange, we carried out additional geological exploration on the soft base section of the Zhongjiang Expressway that was started later, and carried out a detailed survey of key predicated sections such as the vacuum preloading section in the design. The section that is not suitable for vacuum preloading shall be removed, and the impervious curtain of the mixing pile shall be increased to ensure its airtightness and watertightness, and the original design shall be maintained in two places. After the implementation of vacuum preloading, no port-like interchange occurred.
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