Reinforcement construction method with coral sand foundation deep vibroflotation cooperating with shallow watering impact rolling

A technology of impact rolling and coral sand, which is used in infrastructure engineering, soil protection, construction, etc., can solve the problems of general cementation of reef flats, unfavorable overall stability of islands and reefs, and impact on strength and stability. Stable and controllable quality, improved anti-liquefaction performance, and the effect of optimizing construction plans

Active Publication Date: 2018-09-28
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

However, a huge impact load will be generated during the construction of the dynamic compaction method. The degree of cementation of the reef flat layer is average, and the surface layer is porous after

Method used

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  • Reinforcement construction method with coral sand foundation deep vibroflotation cooperating with shallow watering impact rolling
  • Reinforcement construction method with coral sand foundation deep vibroflotation cooperating with shallow watering impact rolling
  • Reinforcement construction method with coral sand foundation deep vibroflotation cooperating with shallow watering impact rolling

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Example 1: Discussion on the variation of the maximum compacted dry density of dredged coral sand with water content

[0043] 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.

[0044] 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

[0045] Embodiment 2: a kind of construction method of coral sand foundation deep vibrating and shallow impact rolling reinforcement, such as Figure 4 shown, including the following steps:

[0046] Step 1. Level the site, do a good job of construction preparations before vibroflotation (water supply, power supply, pile location layout, etc.), and then conduct two-point resonance tests with different spacings according to the requirements of design parameters, and determine the appropriate compactness through tests. Current, vibration retention time and vibrating point spacing, the vibrating spacing in this embodiment is between 2.5-3.5m, arranged in an equilateral triangle, and the vibrating depth is 0.5m above the design depth of the foundation treatment.

[0047] Step 2. During formal vibrating construction, if the water content of the foundation soil is low, the foundation should be irrigated before construction to ensure that the water content meets the design requirements...

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Abstract

The invention relates to the field of coral sand foundation treatment, in particular to a reinforcement construction method with coral sand foundation deep vibroflotation cooperating with shallow watering impact rolling. According to the characteristics that a hydraulic fill coral sand foundation which is subjected to land fill again after the site is transferred is loosened, low in compactness and high in compressibility, the foundation treatment method with a vibroflotation method being combined with a watering impact rolling method is provided, wherein the vibroflotation method is used forthe foundation of which the depth is 1.0 m or above, and the watering impact rolling method is used for the shallow foundation of which the depth is smaller than 1 m. The construction method combinesthe two foundation treatment methods, the compactness of the hydraulic fill coral sand foundation can be remarkably improved, the foundation bearing capacity is improved, the foundation post-construction settlement is reduced, and the construction method has the advantages that operation is easy, the targeted performance is high, and the effect is good.

Description

technical field [0001] The invention relates to the technical field of coral sand foundation treatment, in particular to a strengthening construction method of coral sand foundation deep layer vibrating combined with shallow layer sprinkler impact rolling. Background technique [0002] Dredging reclamation is to excavate the reef and coral sand in the coral reef lagoon, pump them to the reef flat through the mud pump of the cutter suction ship, and accumulate the reef and coral sand into land after the water is lost to form an artificial island. The process of making land in the open sea. The foundation of the dredged artificial island is mainly a mixture of coral reef fragments and coral sand, which is called "coral reef sand" or "coral sand". For land reclamation on coral reefs, in order to improve the bearing capacity of the foundation and reduce the post-construction settlement of the foundation, it is necessary to strengthen the foundation of the coral reef. [0003] ...

Claims

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Application Information

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IPC IPC(8): E02D3/046E02D3/054E02D3/10
CPCE02D3/046E02D3/054E02D3/10
Inventor 王新志谌民朱长歧孟庆山
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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