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Improvement method of high liquid limit soft soil directly used as prefabricated roadbed filling material

A subgrade filling material and prefabricated assembly technology, applied in packaging, construction, roads, etc., can solve the problems of the construction period being greatly affected by the environment, the construction process is not easy to control, and the project cost is increased, so as to solve the problem of insufficient stability and realize recyclability. Take advantage of effects that improve stability and strength

Active Publication Date: 2021-12-07
NINGBO COMM PLANNING INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical measures usually adopted at present are to improve by mixing inorganic solidified materials and coarse-grained soil, among which inorganic solidified materials (quick lime or cement) or coarse-grained soil are used for improvement. At the same time, the construction of subgrade filling projects mainly adopts paving, rolling and curing with optimal water content to achieve the target compaction degree as the control index. On the other hand, due to the fact that the conventional high liquid limit soft soil improvement technology cannot effectively control the difference in the filling of the improved soil roadbed, the engineering problems of the filled roadbed are prominent due to uneven settlement and other reasons, which has become a highway Difficulties that engineers and technicians urgently need to solve

Method used

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  • Improvement method of high liquid limit soft soil directly used as prefabricated roadbed filling material
  • Improvement method of high liquid limit soft soil directly used as prefabricated roadbed filling material
  • Improvement method of high liquid limit soft soil directly used as prefabricated roadbed filling material

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Effect test

Embodiment 1

[0034] The soil sample 1 of the present embodiment is taken from the coastal area of ​​Wenzhou;

[0035] In the present embodiment, the high liquid limit soft soil of soil sample 1 is directly used in the improvement method of prefabricated roadbed filling material, comprises the following steps:

[0036] a. To the high liquid limit soft soil of soil sample 1, add quicklime powder, low-grade cement, and fly ash powder in sequence, and then stir at high speed in turn according to the adding order to obtain the first-stage initial mixture; the amount of quicklime powder added Add and stir for 2 minutes according to the mass ratio of 14:100 to the high liquid limit soft soil; add the low-grade cement according to the mass ratio of 4:100 to the high liquid limit soft soil and stir for 2 minutes; And the addition of fly ash powder according to the mass ratio of high liquid limit soft soil is the ratio of 6:100 after adding and stirring for 1min;

[0037] b. The first-stage initial...

Embodiment 2

[0050] The soil sample 2 of the present embodiment is taken near Xinyang Port, Yancheng;

[0051] In the present embodiment, the high liquid limit soft soil of soil sample 2 is directly used in the improvement method of prefabricated roadbed filling material, comprises the following steps:

[0052] a. To the high liquid limit soft soil of soil sample 2, add quicklime powder, low-grade cement, and fly ash powder in sequence, and then stir at high speed in turn according to the order of addition to obtain the first-stage initial mixture; the amount of quicklime powder added Add and stir for 5 minutes according to the mass ratio of 20:100 to the high liquid limit soft soil; add the low-grade cement according to the mass ratio of 8:100 to the high liquid limit soft soil and stir for 3 minutes; And the addition of fly ash powder according to the mass ratio of high liquid limit soft soil is 15:100 after adding and stirring for 2min;

[0053] B, the first-stage initial mixture obtai...

Embodiment 3

[0065] The soil sample 3 of the present embodiment is taken from the road construction site in Wuai Town, 329 National Road, Ningbo City;

[0066] The high liquid limit soft soil in the soil sample 3 of the present embodiment is directly used in the improvement method of prefabricated roadbed filling material, comprises the following steps:

[0067] a. To the high liquid limit soft soil of soil sample 3, add quicklime powder, low-grade cement, and fly ash powder in sequence, and then stir them at high speed in turn according to the order of addition to obtain the first-stage initial mixture; the amount of quicklime powder added Add and stir for 3 minutes according to the mass ratio of 16:100 to the high liquid limit soft soil; add the low-grade cement according to the mass ratio of 6:100 to the high liquid limit soft soil and stir for 4 minutes; And the addition amount of fly ash powder according to the mass ratio of high liquid limit soft soil is 10:100 after adding and stirr...

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Abstract

The invention relates to an improvement method for directly using high liquid limit soft soil as a prefabricated assembled roadbed filling material, which is characterized in that it comprises the following steps: adding quicklime powder, low-grade cement, Fly ash powder, and then according to the order of addition, stir at high speed respectively to obtain the first-stage initial mixture, and then perform the initial stuffing, then add polyacrylate emulsion, styrene-acrylic emulsion, and water-absorbing resin in sequence, perform secondary stuffing, and then add Rice straw, polystyrene foam emulsion, and water-absorbing resin are stuffed three times, and finally, a packaged block that meets the needs of road filling is packaged. Compared with the prior art, the present invention has the advantage that it solves the problem of using high The liquid limit soft soil is directly used for subgrade filling, which not only realizes the recycling of local resources, but also realizes the prefabricated assembly of the filling, and improves the overall strength and bearing capacity of the filling subgrade.

Description

technical field [0001] The invention belongs to the technical field of highway and urban road construction, in particular to an improved method for directly using natural high liquid limit soft soil as prefabricated subgrade filling material. Background technique [0002] On both sides of the Yangtze River Delta, the Ningshao Plain, the Jianghuai Plain in eastern China, and the Pearl River Delta in the southern coastal area, the landforms are alluvial plains, and the covering layers are mostly marine high-liquid such as silt, silt, high-liquid-limit soft soil, and cohesive soil. limited soft soil, plus inland distribution areas with a wide range of bad soils (saline soil, soft soil, expansive soil, high liquid limit soft soil), these high liquid limit soft soils (that is, the main body is often encountered in highway engineering The liquid limit is greater than 50%, and the plasticity index is greater than 26% (three types of soft soils such as muddy clay, muddy silt, and mu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/18C04B38/10C04B14/36E01C3/00E01C3/04B65B31/04B65B51/10C04B111/34
CPCB65B31/04B65B51/10C04B14/361C04B28/18C04B38/106C04B2111/0075C04B2111/343E01C3/00E01C3/04C04B22/064C04B7/00C04B18/08C04B24/2641C04B2103/0051C04B18/248C04B24/2676C04B24/129C04B24/124C04B24/16
Inventor 黄宝涛朱汉华张牧黄保建龚杰林陈孟冲周明妮李家春蒋儿牛斌朋茜赵庆娟翟力欣王毓晋国威李良吴限樊昌翼周文杰杜建军
Owner NINGBO COMM PLANNING INST CO LTD
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