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

Cement soil mixing saturated loess composite foundation strengthening method

A technology for cement-soil mixing and cement-soil mixing piles, which is applied in foundation structure engineering, sheet pile walls, buildings, etc., can solve the problems of large settlement, depth and difficulty of roadbed, uneven settlement, etc., so as to reduce construction cost and save steel. Effect

Inactive Publication Date: 2018-01-26
LANZHOU JIAOTONG UNIV
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a cement-soil mixing saturated loess composite foundation reinforcement method, aiming at solving the problems that the existing saturated loess foundation treatment is relatively deep and difficult, and the subgrade will have large settlement and uneven settlement

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
  • Cement soil mixing saturated loess composite foundation strengthening method
  • Cement soil mixing saturated loess composite foundation strengthening method
  • Cement soil mixing saturated loess composite foundation strengthening method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A cement-soil mixing saturated loess composite foundation reinforcement method, the method specifically comprises: drilling a hole into the loess foundation through a mixing machine, spraying a mixed slurry into the hole while drilling, and forcibly stirring the loess and the mixed slurry deep in the foundation, so that The loess and the mixed slurry (curing agent) are fully mixed together to obtain a cement-soil mixing pile after curing; the cement-soil mixing pile is cured at 20° C. and a relative humidity of 90% or less for 90 days.

[0025] In the embodiment of the present invention, the mixed slurry is composed of fly ash, and the fly ash is composed of cement and fly ash, and the mass ratio of the cement and fly ash is 4:1.

[0026] The unconfined compressive strength of the cement-soil mixing pile was tested, and the results are shown in Table 1 below:

[0027] Table 1 The relationship between the amount of mixed grout and the unconfined compressive strength of c...

Embodiment 2

[0039] A cement-soil mixing saturated loess composite foundation reinforcement method, the method specifically comprises: drilling a hole into the loess foundation through a mixing machine, spraying a mixed slurry into the hole while drilling, and forcibly stirring the loess and the mixed slurry deep in the foundation, so that The loess is fully mixed with the mixed slurry, and the cement-soil mixing pile is obtained after solidification; the cement-soil mixing pile is maintained at 20° C. and the relative humidity is less than or equal to 90% for 90 days.

[0040] In the embodiment of the present invention, the mixed slurry is composed of fly ash and biomass, the fly ash is composed of cement and fly ash, and the biomass is organic matter mixed with plant roots in any proportion.

[0041] Table 2 Proportion table of biomass cement mixing saturated loess test

[0042]

[0043] The unconfined compressive strength test of the stirred saturated loess containing biomass cement sh...

Embodiment 3

[0045] A cement-soil mixing saturated loess composite foundation reinforcement method, the method specifically comprises: drilling a hole into the loess foundation through a mixing machine, spraying a mixed slurry into the hole while drilling, and forcibly stirring the loess and the mixed slurry deep in the foundation, so that The loess is fully mixed with the mixed slurry, and the cement-soil mixing pile is obtained after solidification; the cement-soil mixing pile is maintained at 20° C. and the relative humidity is less than or equal to 90% for 90 days.

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
Strengthaaaaaaaaaa
Unconfined compressive strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a cement soil mixing saturated loess composite foundation strengthening method. The method particularly includes the steps that a hole is drilled into a loess foundation through a mixing machine, mixed slurry is jetted into the hole while the hole is drilled, loess and the mixed slurry are mixed forcedly at the deep position of the foundation, the loess and the mixed slurryare sufficiently mixed together, and a cement soil mixing pile is obtained after curing; the mixed slurry comprises two kinds of grey matters, the two kinds of grey matters are formed by cement powder and coal ash with the mass ratio being (2-4):1; and in the cement soil mixing pile, the mixed slurry doping amount accounts for 12%-20% of the loess mass. According to the cement soil mixing saturated loess composite foundation strengthening method, a curing agent and original foundation soft soil are sufficiently stirred and mixed on the spot, original soil is used to the maximum degree, influences on original buildings are very small, a large amount of rolled steel is saved, and the construction cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of railway foundation reinforcement, in particular to a cement-soil mixing saturated loess composite foundation reinforcement method. Background technique [0002] Loess is a kind of porous and weakly cemented Quaternary sediment. In Northwest China, loess is widely distributed, thick, complete strata, and has many and complex landform types. It is the most developed area of ​​loess in the world. Most of the loess belongs to the typical eolian loess, which has the characteristics of large sedimentary thickness and loose structure. Its vertical joints are developed, and its particle composition is mainly coarse-grained silt. Strong sensitivity. [0003] In recent years, with the continuous development of economic construction, the scale of my country's infrastructure construction has become larger and larger. In the past ten years, the research has mainly focused on the treatment of collapsible loess founda...

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): E02D5/46C04B28/00
Inventor 宋小齐
Owner LANZHOU JIAOTONG UNIV