Rapid consolidation method applicable to silt soft foundation

Abstract

The invention relates to a rapid consolidation method applicable to a silt soft foundation. The rapid consolidation method applicable to the silt soft foundation comprises the following steps of in the normal position of reclamation sludge of a superficial layer to be treated, adding soda-manufacturing waste residues, carbon residues and a non-ionic surface active agent into the reclamation sludge, stirring, and reacting at the natural temperature, wherein the adding amount of the soda-manufacturing waste residues is 8 percent to 12 percent of the weight of the reclamation sludge, the adding amount of the non-ionic surface active agent is 3 thousandth to 5 thousandth of the soda-manufacturing waste residues, the adding amount of the carbon residues is 3 percent to 6 percent of the weight of the reclamation sludge, and the reinforced depth of the weight of the reclamation sludge is 1 to 2m; and after finishing reaction, adopting a vacuum jet pump for vacuum absorbing water, accomplishing rapid consolidation of the silt soft foundation, and using a soil-consolidated place as a working cushion, wherein the soda-manufacturing waste residues are waste residues produced by soda ash production and contains Ca ions. The method provided by the invention is reasonable, and fast and thorough in drainage consolidation, has the characteristics of energy conservation and environment protection at the same time, and further effectively utilizes the soda-manufacturing waste residues.

Description

technical field [0001] The invention relates to a method for draining and consolidating mud soft foundations in port engineering, in particular to a rapid consolidation method suitable for mud soft foundations. Background technique [0002] In port engineering construction, one of the key technologies is silt treatment and silt utilization, which is one of the main factors affecting project quality, construction period and cost. The silt has fine particles, high water content, and poor physical and mechanical indicators. During the construction of the port, the silt must be treated, and the silt must be excavated or drained and consolidated to be used as a foundation. Commonly used silt reinforcement technologies and processes in the prior art include: [0003] Rock replacement: Use mechanical dredging to remove the silt and then throw rocks to form a dump foundation, or use the patented blasting technology to replace the silt to form a stable foundation for the building. ...

AI Technical Summary

Problems solved by technology

The disadvantages are: a large amount of rock filling is required, resulting in a waste of natural resources; the silt excavated by machinery and the silt squeezed out by blasting cause secondary handling and pollution

The disadvantages are: the silt particles are too fine, the permeability coefficient is too low, and the vacuuming time is too long (for example, in Lianyungang Port, when the silt thickness is 18 meters, the vacuuming time takes 9 months), which seriously affects the progress of the project and the project cost is also high; After the silt foundation is strengthened by vacuum preloading, the water content of the silt is still high, about 50-60%, the strength is low, the bearing capacity is small, and the later settlement is large

Disadvantages are: the grading and stacking time is longer, a large amount of stockpiling materials is required, and the transfer of stockpiling materials requires a large cost

The disadvantages are: a large amount of admixture is added, and the cost is high, and it is only used in the key parts of the project; the quality of the project is not easy to guarantee, and this process has been canceled in many areas

The commonly used method is: sedimentation and drying for 4 months, after laying woven cloth and bamboo battens, use mountain soil as a working cushion, which not only greatly increases the project cost, but also brings great construction risks