Consolidation method of soft earth foundation
A kind of soft ground and weak technology, which is applied in the direction of infrastructure engineering, soil protection, construction, etc., can solve the problems of high cost, long construction period, and high cost, and achieve the effect of increased precompression stress and significant social and economic benefits
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Embodiment 1
[0041] A sea reclamation project with an area of 350,000 square meters, the surface layer is a dredged sandy soil layer with a thickness of 5-6 meters, a water content of 50%, and a permeability coefficient of 10 -4 cm / s; the lower layer is silty soil layer with a thickness of about 18 meters, a water content of 90%, and a permeability coefficient of 10 -7 cm / s.
[0042] Design requirements: bearing capacity up to 80kPa.
[0043] like figure 1 and 2 As shown, follow the steps below for construction:
[0044] The first step is to use a mixing pile machine to spray high-pressure cement slurry into the soil layer while stirring at the periphery of the construction area, and the mixing amount is controlled at 12-20% (weight ratio) to make the soft soil harden into a solid structure. The cement-reinforced soil (water-stop wall 30) with water resistance, water stability and a certain strength, the thickness of the water-stop wall 30 is controlled at 0.6-1.5 meters, and the dep...
Embodiment 2
[0056] A sea reclamation project with an area of 200,000 square meters, the surface layer is dredged sandy soil with a thickness of 5-6 meters, a water content of 50%, and a permeability coefficient of 10 -5 cm / s; the lower layer is a silt layer with a thickness of about 16 meters, a water content of 55%, and a permeability coefficient of 10 -7 cm / s.
[0057] Design requirements: bearing capacity up to 100kPa.
[0058] Construction according to the following steps:
[0059] The first step is to spray high-pressure pure clay mud into the soil layer while stirring with a mixing pile machine at the periphery of the construction area, and the mixing amount is controlled at 20-30% (weight ratio), so that the soft soil hardens into a Integrity, water stability and a certain strength of cement reinforcement soil (water stop wall), the thickness of the water stop wall is controlled at 0.6 to 1.5 meters, and the depth is guaranteed to penetrate the dredged sand layer and enter the ...
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