Pile-supported soft soil roadbed reinforcing structure and reinforcing method

Abstract

The invention discloses a pile-supported soft soil roadbed reinforcing structure and a reinforcing method. The pile-supported soft soil roadbed reinforcing structure comprises a solidified sludge filling embankment layer, a pile-supported soft soil roadbed reinforcing layer, a pile-supported soft soil roadbed reinforcing layer and a pile-supported soft soil roadbed reinforcing layer which are sequentially arranged from top to bottom, the three-dimensional geocell reinforced cushion layer is formed by filling a three-dimensional geocell with potassium magnesium phosphate cement solidified sludge; the shallow soft soil solidification layer is formed by in-situ stirring and solidification of soft soil through a soil solidifying agent; a pile bearing structure of a cement mixing pile group; and a bearing layer; the upper end of the pile bearing structure of the cement mixing pile group extends into the shallow soft soil solidification layer, and the lower end of the pile bearing structure of the cement mixing pile group extends into the bearing layer. On the basis of the concept of using local materials and treating waste with waste, an environment-friendly sludge curing technology is introduced, and in-situ curing of soil between shallow piles is conducted, a cement mixing pile group serves as a pile bearing structure, a three-dimensional geocell replaces a two-dimensional geogrid, and sludge solidified soil serves as a reinforced cushion layer filling material and roadbed filler; the method has the outstanding advantages of improving the rib-soil interface friction force, controlling differential settlement, preventing lateral deformation and the like.

Description

technical field [0001] The invention relates to the technical field of foundation treatment, in particular to a pile-supported soft soil subgrade reinforcement structure and a reinforcement method. Background technique [0002] With the rapid development of my country's economy and society, highways and railways have been vigorously developed as public infrastructure and have entered a period of rapid development. However, the construction of infrastructure such as highways and railways needs to pass through weak soil layers such as silt, muddy soil, plain fill, silt, loess, and peat soil, so it often faces insufficient foundation bearing capacity, settlement or uneven settlement. Too large, too large lateral deformation, overall or local instability and other problems. The pile-supported reinforced embankment has the characteristics of short construction period, no need for equal-load preloading after filling, and good treatment effect. In recent years, it has been widely ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a pile-supported soft soil roadbed reinforcement structure and reinforcement method. Based on the concept of local materials and waste treatment, the sludge environmental protection solidification technology is introduced, and the soil between the shallow piles is solidified in situ, and the cement mixing pile group As a pile bearing structure, three-dimensional geocell instead of two-dimensional geogrid, silt solidified soil as a reinforced cushion filling material and roadbed filler, etc., the structural design is reasonable, economical, environmentally friendly and energy-saving, and can improve the friction force of the reinforcement-soil interface, Control uneven settlement, prevent lateral deformation, and to a certain extent solve the huge amount of building material resources required for traffic engineering construction, as well as environmental pollution and land occupation caused by dredging silt.

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