Water-spray impact rolling construction method for shallow blow-filled coral sand foundation

A technology of impact rolling and coral sand, which is applied in basic structure engineering, soil protection, construction, etc., can solve the problems that the dredging coral sand foundation cannot achieve the best compaction effect, the shape of the particles is irregular, and the particles are easily broken. , to achieve the effect of adjustable thickness, controllable quality and simple operation

Active Publication Date: 2018-07-20
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

The dredged coral sand is a non-cohesive soil with irregular particle shape, wide gradation, and easily broken particles. It has physical and mechanical properties different from general terrestrial dredged fill. The compaction test shows that: the dredged coral sand does not exist. The optim...

Method used

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  • Water-spray impact rolling construction method for shallow blow-filled coral sand foundation
  • Water-spray impact rolling construction method for shallow blow-filled coral sand foundation
  • Water-spray impact rolling construction method for shallow blow-filled coral sand foundation

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1: Discussion on the variation of the maximum compacted dry density of dredged coral sand with water content

[0035] Collect the coral sand (coral gravel soil, coral gravel sand, coral mid-sand) of a reclaimed island reef, add a certain amount of water to it, mix well, and carry out drying and water content control according to the geotechnical test procedures. According to the "Standards for Soil Test Methods" (GB / T50123-1999), the maximum compacted dry density is tested, and the trend of the maximum compacted dry density with water content is studied. The test results are as follows: Figure 1-3 shown.

[0036] from figure 1 It can be seen that the maximum compacted dry density of coral gravel soil when dry is 1.85g / cm 3, with the increase of water content, the maximum compacted dry density first decreased and then increased. When the water content was 14%, the maximum compacted dry density reached the minimum value; from figure 2 It can be seen that the ...

Embodiment 2

[0037] Embodiment 2: A kind of construction method of spraying water and impacting rolling on shallow layer dredging and filling coral sand foundation, such as Figure 4 shown, including the following steps:

[0038] Step 1. The dredged coral sand foundation that has been transferred and refilled on site is relatively loose. Sprinkle water on the surface of the soil, and then fully mix the soil on the surface with the loose soil;

[0039] Step 2. Clean and level the ground after mixing, push it back and forth twice with a bulldozer, and at the same time, sprinkler with sprinkler to ensure that the water content meets the design requirements (water content ≥ 20%);

[0040] Step 3: Use a 25kJ triangular impact roller to impact and roll 20 times at a speed of 10-12km / h until the foundation is compacted. During the impact rolling process, sprinklers cooperate with watering to ensure that the water content meets the design requirements (water content ≥ 20%), the speed of the sprin...

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Abstract

The invention relates to the field of treatment of shallow blow-filled coral sand foundations and particularly relates to a water-spray impact rolling construction method for a shallow blow-filled coral sand foundation. According to the characteristics that a transferred and refilled blow-filled coral sand foundation on a site is relatively loose, relatively low in compactness and a little large in compressibility, the construction method has the requirements that the site is firstly leveled, afterwards water is sprayed on the site until the coral sand foundation is close to an optimal water content state (the water content is larger than or equal to 20%), subsequently impact rolling is performed by utilizing a 25kJ trilateral impact road roller, and water is continuously sprayed in the overall impact rolling process until the foundation is compacted. Impact rolling is performed twenty times, subsequently a 25t vibratory smooth road roller is used for rolling the foundation until the foundation has no obvious wheelmark. The construction method provided by the invention can improve the compaction degree of the blow-filled coral sand island foundation, increases the bearing capacityof the foundation, reduces post-construction settlement of the foundation and has the advantages of simple operation and good effect.

Description

technical field [0001] The invention relates to the technical field of dredging and filling coral sand foundations, in particular to a construction method of sprinkling and impacting rolling on shallow dredging and filling coral sand foundations. Background technique [0002] The dredging reclamation is to excavate the reef and coral sand in the coral reef lagoon, and pump them to the reef flat through the mud pump of the cutter suction ship. After the water flows away, the reef and coral sand accumulate into land to form an artificial island. The foundation of the dredged artificial island is mainly a mixture of coral reef limestone fragments and coral sand, which is called "coral reef sand" or "coral sand". Land reclamation on coral reefs involves land reclamation of coral sand foundations. [0003] Impact rolling technology is generally used in foundation construction, and its purpose is to compact the foundation. In actual construction, it is necessary to use impact rol...

Claims

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Application Information

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IPC IPC(8): E02D3/046
CPCE02D3/046
Inventor 王新志陈伟俊朱长歧
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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