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A Construction Method of Sprinkling Water Impact Rolling on Shallow Drought Coral Sand Foundation

A technology of impact rolling and coral sand, applied in infrastructure engineering, construction, soil protection and other directions, can solve the problems of irregular particle shape, filling coral sand foundation can not achieve the best compaction effect, gradation width and other problems

Active Publication Date: 2021-09-14
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 optimal water content, but the maximum dry density can only be achieved when it is the driest and close to saturation, which means that if the terrestrial soil foundation is copied and impacted according to the optimal water content, the coral sand foundation cannot be optimally filled. compaction effect

Method used

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  • A Construction Method of Sprinkling Water Impact Rolling on Shallow Drought Coral Sand Foundation
  • A Construction Method of Sprinkling Water Impact Rolling on Shallow Drought Coral Sand Foundation
  • A Construction Method of Sprinkling Water Impact Rolling on Shallow Drought Coral Sand Foundation

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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, and coral medium sand) of a reclaimed island reef, add a certain amount of water to it, mix well, and perform 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 detected, 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 t...

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 shallow dredging and filling coral sand foundation treatment, in particular to a construction method of spraying and impacting rolling on shallow dredging and filling coral sand foundations. In view of the looseness, low density and slightly high compressibility of the dredged coral sand foundation that has been transshipped and refilled on site, this construction method requires that the site be leveled first, and then sprinkled on the site until the coral sand foundation is close to the optimal level. Moisture content state (moisture content ≥ 20%), then use a 25 kJ triangular impact roller for impact rolling, and always cooperate with watering during the impact rolling process until the foundation is compacted. The number of times of impact rolling is 20 times, and then it is rolled with a 25t vibrating smooth surface roller until there is no obvious wheel mark. The construction method of the invention can improve the compactness of the foundation of the dredged coral sand island reef, increase the bearing capacity of the foundation, reduce the settlement of the foundation after construction, 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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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/046
CPCE02D3/046
Inventor 王新志陈伟俊朱长歧
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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