Ultra-low drainage vacuum preloading soft soil foundation treatment method

Abstract

The invention discloses an ultra-low drainage vacuum preloading soft soil foundation treatment method. The ultra-low drainage vacuum preloading soft soil foundation treatment method comprises the following steps that 1, low drainage bodies are matched with vacuum conduction pipes to be inserted into a design elevation of a reinforced area; 2, horizontal drainage pipes are laid and connected with the vacuum conduction pipes of the lower drainage bodies to form a pipe network; 3, geotextile and sealing films are laid for sealing; 4, vacuum pumps are started to perform vacuuming to vent, drain and solidify a soil body in the reinforced zone; 5, water pumped in the step 4 is pumped to the sealing films as basic load to increase the total stress of the soil body in the reinforced zone under thesealing films; and 6, the pore pressure and settlement indexes of the soil body in the reinforced zone are detected, after the design requirements are met, vacuum equipment is removed, and the horizontal drain pipes and the vacuum conduction pipes are recovered for secondary utilization. According to the ultra-low drainage vacuum preloading soft soil foundation treatment method, the drainage fluidity performance of the low drainage bodies can be increased, the vacuum action area of the low drainage bodies can be increased, the drainage preloading efficiency can be improved, and the risks suchas bending, folding and clogging of original drainage bodies can be reduced or eliminated.

Description

technical field [0001] The invention belongs to the field of soft soil foundation treatment, in particular to a method for treating ultra-low drainage vacuum preloaded soft soil foundation. Background technique [0002] At present, there are still a large number of weak foundations such as beach areas, reclamation land wetlands, and newly filled fish ponds in my country's coastal areas. A solid foundation is a necessary condition for the construction of municipal engineering infrastructure in this area. Therefore, how to be efficient, energy-saving, and It is an urgent engineering problem to improve the treatment rate of soft soil in this area in an environment-friendly manner. [0003] Vacuum preloading method is an effective method to reduce the water content of silt, saturated soft clay, dredger fill, etc., and improve the strength of the soil. However, the drainage method of the traditional vacuum preloading method is high-level drainage, the vacuum load is transmitted f...

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Problems solved by technology

However, the drainage method of the traditional vacuum preloading method is high-level drainage, the vacuum load is transmitted from top to bottom, the direction of water flow in the drainage body is upward, the vertical channel of the drainage plate is filled with water, and the vacuum action area is very small

Therefore, there are the following defects: 1. The drainage board with less rigidity is prone to bending, breaking and other undesirable phenomena as the drainage consolidation progresses, which leads to poor drainage during the soil reinforcement process; 2. The airtightness of the system is difficult 3. The reinforcement effect is not ideal, the top layer of the reinforced area is easy to form a "hard shell", but the bottom soil cannot be reinforced

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