Unlock instant, AI-driven research and patent intelligence for your innovation.

Staggered-layer grouting soil-fixing method for reinforcing mucky soil in subway construction

A silty soil and grouting technology, applied in soil protection, construction, infrastructure engineering, etc., can solve the problems of less application of silty soil and poor water stability, and achieve good curing effect, simple production method, overall Economical effect

Active Publication Date: 2021-04-30
XIANGTAN UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the long-term strength of bio-enzyme soil stabilizer is not affected by organic matter, its water stability is poor, so it is currently mostly used for the treatment of gravel soil roadbeds with good engineering properties, and for the reinforcement of muddy soil with poor engineering properties. less

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Staggered-layer grouting soil-fixing method for reinforcing mucky soil in subway construction
  • Staggered-layer grouting soil-fixing method for reinforcing mucky soil in subway construction
  • Staggered-layer grouting soil-fixing method for reinforcing mucky soil in subway construction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Dilute biological enzyme solution 0.5%; cement 15%; lime 9%; take the biological enzyme stock solution, add pure water at a ratio of 1:5 to dilute and mix evenly, then add weighed cement, lime and silt with a moisture content of 33.3%. In the soil, after being forced to stir evenly, maintain at a constant temperature;

[0051] The effect of solidifying muddy soil is:

[0052] For Tairan enzyme reinforced soil, the shear strength under normal stress of 100kPa: when the age is 1 day: 181.8kPa; when the age is 3 days: 227.7kPa; when the age is 7 days: 313.2kPa; when the age is 28 days: 624.6kPa; When the age is 60 days: 272.3kPa; when the age is 90 days: 315.0kPa;

[0053] For E3 enzyme-enhanced soil, shear strength under normal stress of 100kPa: when the age is 1 day: 165.7kPa; when the age is 3 days: 202.1kPa; when the age is 7 days: 276.9kPa; when the age is 28 days: 574.3kPa; When the age is 60 days: 302.1kPa When the age is 90 days: 289.7kPa.

Embodiment 2

[0055] A biological enzyme curing agent, dilute biological enzyme solution 0.33%; cement 10%; lime 12%; take the biological enzyme stock solution, add pure water to dilute and mix evenly, add weighed cement, lime and In the silty soil with a moisture content of 33.3%, after being forced to stir evenly, maintain at a constant temperature;

[0056] For Tairan enzyme reinforced soil, shear strength under 100kPa normal stress: when the age is 1 day: 183.5kPa;

[0057] For the soil reinforced by E3 enzyme, the shear strength under normal stress of 100kPa: when the age is 1 day: 171.4kPa.

Embodiment 3

[0059] A biological enzyme curing agent, dilute biological enzyme solution 0.33%; cement 15%; lime 6%; take the biological enzyme stock solution, add pure water to dilute and mix evenly, add weighed cement, lime and In the silty soil with a moisture content of 33.3%, after being forced to stir evenly, maintain at a constant temperature;

[0060] For Tairan enzyme reinforced soil, shear strength under normal stress of 100kPa: when the age is 1 day: 225.0kPa;

[0061] For E3 enzyme reinforced soil, the shear strength under 100kPa normal stress: when the age is 1 day: 140.9kPa.

[0062] Example 3

[0063] A kind of split-layer grouting soil-fixing method for silty soil reinforcement in subway construction comprises the following steps:

[0064] Step 1. Before construction, take samples and tests on the existing site to determine the type of soil sample, physical and mechanical properties, etc.;

[0065] Step 2. Measure the setting out, determine the grouting position, and dril...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Shear strengthaaaaaaaaaa
Shear strengthaaaaaaaaaa
Shear strengthaaaaaaaaaa
Login to View More

Abstract

The invention provides a staggered-layer grouting soil-fixing method for reinforcing mucky soil in subway construction, and belongs to the technical field of biological rock soil. The method comprises the following steps that 1, preparation is conducted before construction; 2, grouting holes are determined, wherein the point distribution spacing L is larger than R and smaller than 2R; 3, grouting pipes are placed, grout is prepared, the grouting depth D + Nd is adjusted, and grouting is conducted in a layered mode; 4, grouting operation is repeated, the grouting depth is D + (N +0.5) D, and grouting bodies and surrounding grouting bodies are staggered; 5, the step 3 and the step 4 are repeated, and the grouting bodies with the adjacent depths are staggered in a layered mode until grouting of all the grouting holes is completed; and 6, inspection and acceptance are conducted. According to the technical scheme, the matched staggered-layer grouting soil-fixing method is provided according to a plate-shaped scattering structure during grouting of the formula grout, the point distribution spacing L is larger than R and smaller than 2R, the grouting depths are D + Nd and D + (N +0.5) D respectively, the grouting bodies are staggered in the layered mode, and the situation that the overall grouting strength is weakened due to existing weak areas is avoided.

Description

technical field [0001] The invention relates to the technical field of biological rock and soil, in particular to a soil-fixing method of staggered-layer grouting for the reinforcement of silty soil in subway construction. Background technique [0002] In engineering, silt and cohesive soils such as low natural strength, high compressibility, and low water permeability are collectively referred to as muddy soil. Silty soil has low strength, high natural water content, and high compressibility. , High sensitivity, easily disturbed and thixotropic. Subway construction often encounters the problem of silty soil reinforcement treatment. The traditional cement soil reinforcement method is used for silty soil. The humic acid formed by the organic matter in the soil will affect the development of the long-term strength of the cement soil. The biological enzyme soil stabilizer is a kind of green environmental protection A new type of curing agent, its curing mechanism is significan...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): E02D3/12C04B28/10C04B111/70
CPCE02D3/12C04B28/10C04B2111/70C04B2111/00732C04B7/02C04B2103/0001
Inventor 董辉宋天昊程子华刘禹岐黄迎军罗正东
Owner XIANGTAN UNIV