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Method for reinforcing South China sea coral sand foundation by using high-polymer PFA

A technology of high polymer and coral sand, which is used in soil protection, infrastructure engineering, sheet pile walls, etc., can solve the problems of inability to reinforce the foundation of the South China Sea, short solidification time, and lack of irrigability, so as to achieve reinforcement. Good effect, solve the effect of fast solidification and strong adhesion

Inactive Publication Date: 2019-05-28
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For example, in the paper "Experimental Research on Dynamic Residual Deformation Characteristics of Polymer Cemented Rockfill Materials", a reinforcement technology for polymer cemented rockfill materials is proposed, which can significantly improve the strength of rockfill materials and effectively reduce the deformation of rockfill materials under dynamic loads. Permanent deformation, but the inventor found that this polymer reinforcement technology is suitable for the reinforcement of earth-rock dams with large gaps in materials such as rockfill materials. For coral sand with small gaps between materials, the solidification time is short and it is not pourable. Therefore, it cannot be used to strengthen the foundation of the South China Sea

Method used

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  • Method for reinforcing South China sea coral sand foundation by using high-polymer PFA
  • Method for reinforcing South China sea coral sand foundation by using high-polymer PFA
  • Method for reinforcing South China sea coral sand foundation by using high-polymer PFA

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Effect test

Embodiment 1

[0059] In the laboratory, high polymer (PFA) was used to strengthen the calcareous sand in the South China Sea, and the unconfined compressive strength test was carried out on the calcareous sand before and after mixing the high polymer by using the TSZ-3 strain-controlled triaxial instrument , to study the influence of PFA content on its strength; through the unconsolidated and undrained shear strength test, the influence of PFA on the static properties of calcareous sand was analyzed.

[0060] The indoor static triaxial test instrument adopts TSZ-3 strain control type triaxial instrument, the maximum axial load is 30kN, the confining pressure is 0-2.0MPa, and the control error is ±1% FS. The sample diameter of the triaxial test is 39.1mm, the height is 80mm, and the axial strain loading rate is 1.0mm / min.

[0061] The calcareous sand used in the test was taken from the waters near an island and reef in the South China Sea. An appropriate amount of sand samples were taken and...

Embodiment 2

[0065] This embodiment discloses a method for strengthening the coral sand foundation of the South China Sea with polymer PFA, comprising the following steps:

[0066] 1) Simple leveling of the coral sand foundation, removal of ground and underground movable obstacles;

[0067] 2) Arrange the hole position on the coral sand foundation, move and position the drilling rig to the designated position, align the drill pipe head with the center of the hole position, level the drilling rig at the same time, place it stably, and the verticality deviation of the drill pipe is not more than 2% to 3%;

[0068] 3) The positioning drilling rig rotates and drills until it sinks to the design depth;

[0069] 4) Add 65-75 parts of high polymer PFA to the mixer first, then add 30 parts of xylene, and finally add 5 parts of benzene, and the mixer is uniform to form a high polymer PFA mixture;

[0070] 5) The ultra-high pressure PFA pump transports the high polymer PFA mixture to the spray hole...

Embodiment 3

[0075] This embodiment discloses a method for strengthening the coral sand foundation of the South China Sea with polymer PFA, comprising the following steps:

[0076] 1) Simple leveling of the coral sand foundation, removal of ground and underground movable obstacles;

[0077] 2) Arrange the hole position on the coral sand foundation, move and position the drilling rig to the designated position, align the drill pipe head with the center of the hole position, level the drilling rig at the same time, place it stably, and the verticality deviation of the drill pipe is not more than 2% to 3%;

[0078] 3) The positioning drilling rig rotates and drills until it sinks to the design depth;

[0079] 4) Add 65-75 parts of high polymer PFA to the mixer first, and then add 30 parts of xylene, and the mixer is uniform to form a high polymer PFA mixture;

[0080] 5) The ultra-high pressure PFA pump transports the high polymer PFA mixture to the spray hole of the drill bit through the pi...

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Abstract

The invention relates to the field of the coral sand foundation treatment, and specifically relates to a method for reinforcing South china sea coral sand foundation by using high-polymer PFA. Diluentand retarder are added in a novel high-polymer material PFA to effectively solve the problem that the high-polymer PFA is fast in solidification and bad in groutability. The high-polymer PFA is injected into the coral sand foundation, and the foundation bearing capacity is greatly improved. A construction method is characterized by comprising the following steps: performing construction by usingan ultra-high pressure PFA pump and combining a positioning drilling machine with a hole at a drill, wherein the drilling machine firstly positions and drills, and then preparing the high-polymer PFAmixed solution after drilling to a predetermined depth; conveying the high-polymer PFA mixed solution to the drill through the ultra-high pressure pump, starting rotary-jetting the high-polymer PFA mixed solution, improving while performing the rotary-jetting, and ending the rotary-jetting when improving to a designed elevation. The method disclosed by the invention has the advantages that the reinforcing effect is good, the construction is simple, the cost is low, the working life of the high-polymer PFA is prolonged, and the method can be extensively used for reinforcing the South China seacoral sand foundation.

Description

technical field [0001] The invention belongs to the field of coral sand foundation treatment, and in particular relates to a method for reinforcing the coral sand foundation of the South China Sea with polymer PFA. Background technique [0002] Coral reefs, formed over hundreds to thousands of years of growth from the skeletons of thousands of coral polyps composed of calcium carbonate, are an important source of resources. Therefore, it is of great significance to strengthen the coral sand foundation. [0003] Commonly used coral sand foundation treatment methods include: vacuum preloading method, cast-in-place pile method, dynamic compaction method, etc. It is easy to produce vibration liquefaction, resulting in unsatisfactory foundation treatment effect. [0004] Polyurethane Foam Adhesive (PFA) is a kind of high polymer, which has the characteristics of light weight, high strength, good expansibility, and strong cohesive force. After the polyurethane is grouted into th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12E02D7/24
Inventor 高盟李丹阳高运昌
Owner SHANDONG UNIV OF SCI & TECH
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