Research on solutions to enhance stability and protection of sea dike roofs overflowing with water

4. The two-dimensional roof reinforcement panel glue test on a small-scale physical model has simulated the failure mechanism of the reinforced array under the effect of waves. The reasonable distance of anchors can be drawn 4d < c < 10d where c is the distance between anchors and d is the size of reinforcement.

5. Proposing to use CONSOLID additive to strengthen soil with high sand content to cover sea dyke cover to replace clay is also a new scientific and technological proposal, with high efficiency when there is no source of clay to cover the cover. sea dyke. With a large volume of experiments on soil reinforcement mixed with CONSOLID, the thesis The experimental results of the thesis show the effectiveness of the CONSOLID additive and have an application basis.

6. The research results of the thesis are calculated and applied with specific and clear parameters, showing the scientific basis and accuracy of experimental studies.

7. Proposing a plan to calculate the stabilizer of the reinforcement by the method of directly calculating the back push pressure on the bottom of the reinforcement. This proposal is meaningful to expand calculations for many types of reinforcement of sea dyke roofs and roofs of irrigation works.

8. The author has built a handy and simple software suite 'Anchor reinforcement for sea dyke protection slabs-NTM-01', which helps the calculator to have many options when determining the anchor design parameters. reinforcement for sea dyke roof tiles.

Maybe you are interested!

II. Conditions for applying research results

1. The formula (2.26) is used to determine the load capacity of the torsion anchor (the author's form) and is applied to the sea dyke reinforcement plate. Corner

 0.5 applied in the formula ( 2.26 ) is only true for embankment soil

well compacted according to the provisions of the sea dike design standard-2012 [6], or

consistent with the stabilized embankment of the existing sea dyke. Adhesive soils in

The state of plasticity, flexibility or the embankment has not been well compacted with 1.4 (t/m 3 ) has not been verified in this thesis.

k < _

2. With torsion anchors, it should be noted that because the anchors are relatively small and swirl into the soil at a low depth, in order to promote the effectiveness of the anchors, attention must be paid to the anchors being twisted perpendicular to the dyke roof and at the right angle. depth so that the ratio (H/D)= (7 ÷ 8).

3. For additive application, it is not recommended to use additives exceeding 2% because there are undesirable side effects such as cracking over time that the research results of the thesis have presented. When used in excess of 2%, a demonstration test is required. It is not recommended to use less than 1% of the additive, because too little additive will lead to difficulty mixing in the application.

4. The type of sandy soil that is being used for embankment when mixing 2% additives is only equivalent to clay. The clay soil is still used to cover the sea dyke in the traditional style of the designs so far, so when applying protection The field side roof protection needs to comply with the overflow flow as prescribed by the sea dyke design standard-2012 [6].

5. CONSOLID additive is not effective with loose soil, so if the soil has less than 5% clay content, it is necessary to add clay content to at least 10%.

III Existence

Research results only focus on Nam Dinh sea dyke and the most common type of reinforcement is the two-dimensional reinforcement. Not yet extendable to other types of reinforcement.

The research results have only focused on the application of torsion anchorage for the seaward dike reinforcement plate, when the tensile force is pulled perpendicular to the dyke roof. Torsion anchors have not been studied for other applications of irrigation works in general and in the case of anchors being pulled by inclined forces with an inclination angle greater than 30 0 .

The interaction mechanism of the CONSOLID additive with the mineral composition of the soil has not been studied yet, so the additive composition and orientation for the production of alternative materials have not been analyzed yet.

IV Recommendations

Research should be put into practice soon to strengthen the protection of the roof of the sea dyke system and increase the safety of the sea dyke.

Continue to study the application of torsion anchors (anchor type proposed by the thesis author) when pulling obliquely with a bevel greater than 30 0 and torsion anchors working in cohesive soil in a soft, flexible state to further expand the application. This type of torsion anchor is used for some other types of construction, such as protecting the roof of a canal through soft ground or a seawall with a vertical sea-side face that is subject to heavy loads.

DISCLOSED SCIENTIFIC WORKS

1. Hoang Viet Hung-Trinh Minh Thu (2008)-Reinforced soil materials and application problems for sea dyke construction on soft soil-Journal of Agriculture and Rural Development, 8-2008 pp. 74-78.

2. Hoang Viet Hung - Trinh Minh Thu - Ngo Tri Vieng - Nguyen Hoa Hai (2009)- Some problems of calculation, construction design and application of geotextile bags- Journal of Science and Technology of Irrigation and Environment School No. 27-2009-Page 15.

3. Hoang Viet Hung (2009)- Summary of solutions to strengthen sea dykes overflowing water- Journal of Geotechnical Engineering -Page 32 No. 2/2009.

4. Hoang Viet Hung-Trinh Minh Thu-Ngo Tri Vieng (2010)-Research results on the application of CONSOLID additives to reinforce sea-dyke soil-Journal of Agriculture and Rural Development, July 2010.

5. Hoang Viet Hung (2010)-Soil treatment process with CONSOLID additive in sea dyke construction- Geotechnical Journal No. 3-2010.

6. Hoang Viet Hung-Trinh Minh Thu-Ngo Tri Vieng (2011)-Research and application of anchors and reinforcement of roof tiles to protect sea dykes- Journal of Science, Technology, Irrigation and Environment No. 32-2011.

REFERENCES

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[16] Hoang Viet Hung (2010)-Soil treatment process with CONSOLID additive in sea dike construction- Geotechnical Journal, 3-2010.

[17] Hoang Viet Hung - Trinh Minh Thu - Ngo Tri Vieng (2012) - Invention description: “Anchor and reinforcement of roof tiles to protect sea dykes” according to Patent No. 10096 granted under Decision 9903 /QD-SHTT dated 29.02.2012 of the National Office of Intellectual Property-Ministry of Science and Technology.

[18] Hoang Viet Hung - Trinh Minh Thu - Ngo Tri Vieng (2011). Research on application of anchors to reinforce roof tiles to protect sea dykes. Journal of Science, Technology, Irrigation and Environment No. 32-2011.

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II English

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III Russian

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IV French

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Date published: 25/01/2023

Research on solutions to enhance stability and protection of sea dike roofs overflowing with water - 18

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