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Soft-soil foundation treatment method for expressway engineering

A technology for weak soil foundations and highways, applied to roads, roads, buildings, etc., can solve the problems of difficult control of the dosage of admixtures, discrete pile body strength, and uneven stirring of the pile body, etc., achieving a significant compaction effect, The effect of improving the strength of the skeleton and enhancing the connection force

Inactive Publication Date: 2012-07-04
SHIJIAZHUANG TIEDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used lime (cement) pile composite foundation mostly uses other lime soil (or cement soil) mixing piles that are mixed in situ below the ground, which is prone to difficult control of the dosage of admixtures, uneven mixing of the pile body, and discrete pile strength. Large and other defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a. Equipped with filler: mix powdered lime and soil with a volume ratio of 6%:94% to equip lime-improved soil;

[0022] b. Use a cylindrical weight of 35 cm in diameter and 3 tons to ram the weak ground into holes according to the method of ramming at intervals;

[0023] c. For each rammed hole, use 0.08 cubic meters of lime-improved soil for each backfill. According to the construction method of 3 meters of heavy hammer drop distance and 4 consecutive ramming, the method of filling, ramming, refilling, and ramming is implemented. Pile up to the surface of the foundation.

Embodiment 2

[0025] a. Equipped with fillers: mix powdered lime and soil with a volume ratio of 4%:96% with lime-improved soil;

[0026] b. Use a columnar hammer with a diameter of 45 cm and a weight of 5 tons to ram the weak ground into holes according to the method of ramming at intervals;

[0027] c. For each rammed hole, use lime-improved soil of 0.15 cubic meters of backfill. According to the construction method of 5 meters of heavy hammer drop distance, continuous ramming 6 times, the method of filling, ramming, refilling, and ramming is implemented. Pile up to the surface of the foundation.

Embodiment 3

[0029] a. Equipped with fillers: mix powdered lime and soil with a volume ratio of 8%: 92% with lime modified soil;

[0030] b. Use a columnar hammer with a diameter of 40 cm and a weight of 4 tons to ram the soft ground into holes according to the method of ramming at intervals;

[0031] c. For each rammed hole, use 0.10 cubic meter of lime-improved soil for each backfill, and implement the method of filling, ramming, refilling, and ramming according to the construction method of 4 meters of heavy hammer drop distance and continuous ramming 5 times. Pile up to the surface of the foundation.

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Abstract

The invention discloses a soft-soil foundation treatment method for expressway engineering, which belongs to the field of foundation treatment. The method includes the following steps: a preparing filler: preparing lime improved soil according to volume ratio of powder lime and soil mass as 4-8%:92-96%; b adopting a method of dot interlace ramming through a hammer to conduct ramming and pore forming on the soft-soil foundation; and c filling the lime improved soil into rammed pores, using the hammer to ram continuously, and performing filling, ramming, refilling and reramming to form a pile to reach the surface of the foundation. The soft-soil foundation treatment method for the expressway engineering has the advantages of treating on site, compacting deeply, using local materials, and being easy in quality controlling, high in pile strength and economical in investment.

Description

Technical field [0001] The invention relates to a method for processing the foundation of an expressway project, in particular to a method for processing the soft ground of an expressway project. Background technique [0002] In the construction of expressways, weak soil foundations are often encountered. Weak soils are cohesive soils, silt, silt, and fine sands with high natural moisture content, high compressibility, and low strength in a soft plastic state. This kind of foundation soil has low bearing capacity, high water content, high compressibility, complex and changeable soil properties, which cannot meet the requirements of engineering construction, resulting in the settlement of the expressway for a long time after completion, resulting in uneven Settlement, especially at the bridgehead and culvert (passage) embankment section, causes the bridgehead to jump, and even some sections cause road surface subsidence and cracking due to excessive settlement, which seriously aff...

Claims

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Application Information

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IPC IPC(8): E01C3/04
Inventor 杨广庆周乔勇汤劲松张保俭吕鹏熊保林
Owner SHIJIAZHUANG TIEDAO UNIV
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