Drainage consolidation method for soft foundation

Abstract

The invention provides a drainage consolidation method for a soft foundation. The drainage consolidation method for the soft foundation is characterized by comprising the following steps that firstly,a drainage consolidation area is divided into a plurality of sub-areas; secondly, on the boundaries of the sub-areas, vertical geomembrane impermeable layers perpendicular to the ground are constructed; thirdly, a plurality of first sand layers and second sand layers are constructed in bottom soft soil, and in this way, permeable channels intersecting longitudinally and transversely on a horizontal plane are formed; fourthly, a plurality of sand wells or drain boards are at least constructed on the first sand layers and the second sand layers located on the inner layer, and a vertical water draining structure with the bottom embedded in the permeable channels is formed; and fifthly, a plurality of water collecting wells are constructed at least on the first sand layers and the second sandlayers located on the outer layer, the adjacent water collecting wells in the length direction are located on the two adjacent second sand layers separately, the multiple first sand layers are arranged between the adjacent water collecting wells in the width direction at intervals, the bottoms of the water collecting wells are embedded into the permeable channels, then water in the water collecting wells is drained out, water draining of the sub-areas is completed, and solidification of soil is accelerated.

Description

technical field [0001] The invention belongs to the technical field of soft soil foundation treatment in geotechnical engineering, and in particular relates to a method for drainage and consolidation of soft soil foundations. technical background [0002] In order to alleviate the constraints of land resources on the economic development of coastal areas, many coastal areas in my country have formed land areas through land reclamation. Firstly, construct the enclosing and twisting project to enclose the shallow sea to form a fixed dredging reclamation area, then mix the bottom mud of the dredged channel or shallow sea silt with seawater in a certain proportion to form mud, and transport it to the dredging reclamation area with a blowpipe. Water and consolidation form a land area, so the formed soft soil foundation has engineering characteristics such as high water content, high compressibility, high void ratio, high sensitivity, poor structure, and low degree of consolidatio...

AI Technical Summary

Problems solved by technology

The two types of methods are to first set up horizontal drainage bodies (sand cushion, blind ditch, water collection wells, etc.) and vertical drainage bodies (plastic drainage boards, sand wells, etc.), and then load (dynamic load, static load or static load or dynamic load). Alternate application of load) to accelerate the drainage and consolidation of soft soil, the discharged pore water is discharged to the sand cushion layer through plastic drainage boards or sand wells, and then discharged to designated locations or collected in water collection wells through blind ditch, and then discharged with water pumps, such as in China Patent CN 105002883 A discloses an indirect graded relay drainage consolidation method for weak foundations, which is mainly aimed at the weak foundations formed by the reclamation of the sea in the lower saturated clay layer and the upper dredged fill soil layer. A horizontal transfer layer is formed within the depth range above the top surface of the lower saturated cohesive soil layer, a static drainage channel is set in the lower saturated cohesive soil layer, a dynamic drainage channel is set in the upper dredging fill soil layer, and the groundwater in the lower soil layer is discharged to the horizontal transfer layer After layering, the weak foundation is discharged through the power drainage channel, and rapid consolidation is achieved under the action of dynamic compaction. The construction process is complicated, the drainage rate is slow, and the construction cost is high.

[0004] Some new methods have also appeared at present, such as Chinese patents CN 106049413 A, CN 104652409A, etc., by dynamic compaction, the pore water in the soft soil foundation is discharged from the foundation through a vertical vacuum drainage structure. This type of method requires mechanical compaction. And the vertical vacuum drainage structure needs to be equipped with a vacuum device, which is complex in construction and poor in economy; and for example, Chinese patents CN101357817 A, CN 104110025 A, etc., are formed by forming a space structure in soft soil that combines pipes and plastic drainage boards, and then use Vacuuming equipment or pumping equipment forms a vacuum or negative pressure in the pipeline to discharge the pore water in the soft soil. This method needs to lay a large number of pipelines and plastic drainage boards in the soft soil, and the structure is relatively complicated, which destroys the integrity of the soft soil foundation. Sexuality, but also increased construction costs

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