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Bed course replacing and filling and carbonization reinforcing method of soft soil foundation

A soft soil foundation and cushion technology, applied in soil protection, basic structure engineering, construction, etc., can solve problems such as shortening the cycle, uneven settlement, increasing soil strength, etc., and achieve the goal of increasing strength and reducing gas Dissipation, avoiding the effect of uneven settlement

Active Publication Date: 2014-09-03
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: The purpose of the present invention is to provide a carbonization and reinforcement method for replacing cushion layers on soft soil foundations. Gas carbon dioxide is used for carbonation reinforcement, which solves the problem of uneven settlement caused by the traditional filling method, and significantly increases the strength of the soil and shortens the construction period

Method used

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  • Bed course replacing and filling and carbonization reinforcing method of soft soil foundation
  • Bed course replacing and filling and carbonization reinforcing method of soft soil foundation
  • Bed course replacing and filling and carbonization reinforcing method of soft soil foundation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The inventive method comprises the following steps:

[0029] (1) earthwork excavation: according to the geological prospecting results, determine the treatment depth and scope of the soft soil foundation 6, excavate and replace the pit groove 7 with an excavator, the excavation depth is 2.5m, and replace and fill the pit groove 7 Clean up the floating soil;

[0030] (2) Preparation of replacement materials

[0031] Mix the following materials according to the weight ratio, and stir evenly with a mixer to prepare the filling material:

[0032] Silt: fine sand: gravel: light magnesium oxide: water = 100: (10-300): 5: 15: 20; the particle size of fine sand is less than 2mm;

[0033] (3) Pit bottom disposal and initial pressure

[0034] Sprinkle water to moisten the surface layer of the bottom of the pit for refilling the pit 7, then spray light magnesium oxide powder, and compact it with a rammer;

[0035] (4) Lay the ventilation pipe network: the ventilation pipe netw...

Embodiment 2

[0042] The inventive method comprises the following steps:

[0043] (1) earthwork excavation: according to the geological prospecting results, determine the treatment depth and scope of the soft soil foundation 6, excavate and replace the pit groove 7 with an excavator, the excavation depth is 2.5m, and replace and fill the pit groove 7 Clean up the floating soil;

[0044] (2) Preparation of replacement materials

[0045] Mix the following materials according to the weight ratio, and stir evenly with a mixer to prepare the filling material:

[0046] Soft soil: fine sand: gravel: light magnesium oxide: water = 100: (10-300): (5-15): (15-20): 15; the particle size of fine sand is less than 2mm;

[0047] (3) Pit bottom disposal and initial pressure

[0048] Sprinkle water to moisten the surface layer of the pit bottom of the replacement pit 7, then spray light magnesium oxide powder, and compact with a rammer;

[0049] (4) Lay the ventilation pipe network: the ventilation pip...

Embodiment 3

[0056] The inventive method comprises the following steps:

[0057] (1) earthwork excavation: according to the geological prospecting results, determine the treatment depth and scope of the soft soil foundation 6, excavate and replace the pit groove 7 with an excavator, the excavation depth is 2.5m, and replace and fill the pit groove 7 Clean up the floating soil;

[0058] (2) Preparation of replacement materials

[0059] Mix the following materials according to the weight ratio, and stir evenly with a mixer to prepare the filling material:

[0060] Silt: fly ash: gravel: light magnesium oxide powder: water = 100: (20-200): (15-30): (15-30): 30; the particle size of fly ash is less than 2mm;

[0061] (3) Pit bottom disposal and initial pressure

[0062] Sprinkle water on the surface layer of the bottom of the pit for refilling pit 7, then spray light magnesium oxide powder, and compact with a road roller;

[0063] (4) Lay the ventilation pipe network: the ventilation pipe ...

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Abstract

The invention discloses a bed course replacing and filling and carbonization reinforcing method of a soft soil foundation and relates to a foundation handling method, in particular to a replacing and filling and carbonization reinforcing method of a large-area shallow soft uneven foundation. The method includes the steps of pit earth excavation, replacing and filling material preparation, pit bottom handling and initial pressurization, ventilating pipe network laying, replacing and filling material spreading and rolling compaction, arrangement of a sealing system, temporary ballasting and carbonization by introducing carbon dioxide gas. The replacing and filling material is prepared from original soil, fine aggregates, coarse aggregates and alkaline curing agent powder, and the fine aggregates and the coarse aggregates contain sand, coal ash, slag, gravel, construction waste and other cheap materials. Gas is introduced through a thin pipe, carbonization is performed through the greenhouse gas carbon dioxide and can be completed in several hours, high strength is achieved, and engineering requirements are met. Differential settlement of structures on the upper portion of the soft foundation can be avoided through bed course replacement and filling and carbonization reinforcement, and the bed course replacing and filling and carbonization reinforcing method of the soft soil foundation has the advantages that advantages that bearing capacity is high, manufacturing cost is low, construction is efficient, and low carbon and environment protection are achieved.

Description

technical field [0001] The invention relates to the field of civil engineering foundation treatment, in particular to a carbonization and reinforcement method for replacing cushion layers on soft soil foundations. Background technique [0002] The deterioration of the ecological environment and climate warming caused by the development of civil engineering-related industries have taught mankind a profound lesson. The main reason is that the production of construction materials (cement, lime, etc.) emits a large amount of dust and carbon dioxide gas, and the pollutants are increasing day by day. It has become an obstacle restricting the stable development of the economic environment and socialization. Therefore, seeking new environmentally friendly materials to replace traditional Portland cement is a new research direction in materials science and environmental geotechnical circles. [0003] The commonly used methods of foundation treatment mainly include deep hole deep dyn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/02E02D3/08
Inventor 蔡光华刘松玉
Owner SOUTHEAST UNIV
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