A method of quickly building roads on newly dredged silt foundation

Abstract

The invention discloses a method for quickly building a road on a new reclamation sludge foundation, which comprises the steps as follows for construction: (1) arranging a working layer; (2) paving a sand cushion on the working layer; (3) arranging a vertical drainage body; (4) arranging a horizontal drainage channel in the sand cushion, wherein the horizontal drainage channel is connected with drainage and pumping equipment; (5) stacking and constructing in grades in an area to be reinforced; (6) travelling on the surface of the area to be reinforced to apply a moveable load by construction machinery, so as to pre-compress with a stacking load as a stationary load, and meanwhile starting the drainage and pumping equipment to drain so as to reinforce the foundation; and (7) after pre-compressing, removing the drainage and pumping equipment and plugging the horizontal drainage channel. The method provided by the invention solves the technical problem that a temporary or permanent road cannot be quickly built on the new reclamation sludge foundation, and a plenty of water bodies in the foundation are drained quickly by traveling load of the construction machinery combined with stacking pre-compression and drainage, and the water head in a drainage cushion is reduced, so that drainage smoothness is maintained and the reinforcing purpose is achieved.

Description

technical field [0001] The invention relates to the technical field of foundation treatment for fixed buildings such as port engineering, construction engineering, and highway engineering, and in particular to engineering techniques for supersoft soil foundation reinforcement such as sea reclamation, artificial islands, and road filling subgrades. Background technique [0002] With the rapid development of our country's economy, land reclamation has become the main way to solve the land for large ports and port-side industrial construction. Due to the shortage of sand and gravel resources, high cost, and serious environmental damage, at the same time, the amount of soil dredged in my country's port waterways is more than hundreds of millions of cubic meters per year. The main filling material. Because most of the dredged soil is ultra-soft soil with extremely high moisture content (greater than 150%) and low permeability, the dredged soil site cannot be used directly and mus...

AI Technical Summary

Problems solved by technology

However, the existing surcharge preloading engineering practice shows that due to the high water content of the ultra-soft soil foundation, the compression deformation of the foundation is large, and the sand cushion used as the drainage cushion sinks with the settlement of the foundation, forming a basin shape and accumulating on the sand cushion. The water in the sand cushion cannot be drained out of the reinforcement area, resulting in a sharp rise in the water head in the sand cushion, and the sand cushion originally used as a permeable boundary gradually develops into an "impermeable layer" or "semi-permeable layer", which seriously weakens the sand cushion. water permeability, thereby reducing the reinforcement effect of surcharge preloading. At the same time, affected by the water head in the sand cushion, the drainage is not smooth, and the settlement rate is reduced. The degree of consolidation calculated from the settlement curve measured on site is greater than the actual degree of consolidation, resulting in Early unloading greatly increases post-construction settlement

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