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Improvement method of high-liquid limit soil for roadbed filling

A technology of high liquid limit soil and soil roadbed, applied in the direction of roads, roads, buildings, etc., can solve the problems of difficult high liquid limit soil improvement demand and large price increase of sand and gravel.

Inactive Publication Date: 2019-03-22
CENT SOUTH UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, it is difficult to meet the improvement needs of various types of high liquid limit soil by mixing a certain material alone, and due to the restrictions of the ban on mining in rivers and environmental protection, the price of sand and gravel has increased greatly. Therefore, the present invention proposes a new high liquid limit soil. Improvement method of limited soft soil subgrade

Method used

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  • Improvement method of high-liquid limit soil for roadbed filling
  • Improvement method of high-liquid limit soil for roadbed filling
  • Improvement method of high-liquid limit soil for roadbed filling

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example

[0031] Take No. 1 soil sample, add 3% and 5% composite curing agent respectively, and its CBR value and 7D and 28D unconfined compressive strength are shown in Table 2:

[0032] Table 2 CBR and strength values ​​of soil sample 1

[0033]

[0034] Take No. 2 soil sample, add 3% and 5% composite curing agent respectively, and its CBR value and 7D and 28D unconfined compressive strength are shown in Table 3:

[0035] Table 3 CBR and strength values ​​of soil sample 2

[0036]

[0037] Take No. 3 soil sample, add 6% and 8% composite curing agent respectively, and its CBR value and 7D and 28D unconfined compressive strength are shown in Table 3:

[0038] Table 4 CBR and strength values ​​of soil sample 3

[0039]

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Abstract

The invention discloses an improvement method of high-liquid limit soil for roadbed filling, the weight percentage of each component of a curing agent used by the method, as well as a range and methodof use thereof. The curing agent uses cement as a main curing material; the main function of gypsum and a UEA expansion agent is used for generating ettringite to provide an expansion source and fillthe pores; and high-valent cations are introduced to exchange with soft soil cations, so that a diffusion layer becomes thinner, and the soil strength and stability are increased. The improvement method is applicable to high-liquid limit soil with a liquid limit of 50-100%; and through a series of steps, a mixing amount ratio of the curing agent is determined, the uniform mixing of the curing agent and the high-liquid limit soil is ensured, and the compacted water content is controlled to be slightly higher than the optimum water content. The implementation of the method is capable of solvingthe problem that the compaction degree and strength of the high-liquid limit soil cannot meet the requirements of design specification; and soil can be locally taken for the soil sections with wide distribution of the high-liquid limit soil, thereby reducing the applicability of the sand and gravel materials, and bringing benefits to protect the environment and reduce the cost.

Description

technical field [0001] The invention relates to the technical field of roadbed filling materials in road engineering, in particular to an improved method of using high liquid limit soil for roadbed filling. Background technique [0002] Due to numerous lakes and dense water networks, high liquid limit soils are widely distributed in southern my country. Highway is a large linear structure, which generally crosses different topography and landforms, and will encounter various high liquid limit soils along the route. High liquid limit soil generally refers to soil with a liquid limit greater than 50% and a plasticity index greater than 26. High liquid limit soil has bad properties such as high water content, light bulk density, poor stability, low strength, etc. According to the conventional construction technology, the compaction degree cannot meet the design specification requirements. [0003] For the subgrade treatment of high liquid limit soil, the conservative view is ...

Claims

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Application Information

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IPC IPC(8): E01C3/00E01C3/04
CPCE01C3/00E01C3/04
Inventor 汪优汤明明张洪东张壮壮
Owner CENT SOUTH UNIV