Construction method using modified collapsible loess as roadbed filler

A technology of collapsible loess and roadbed filler, applied in the directions of roads, roads, buildings, etc., to achieve the effect of good elastic-plastic characteristics and large adjustable range

Inactive Publication Date: 2018-05-08
JIANGSU SINOROAD ENG TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Highway subgrades need to adopt high standards in terms of subgrade structure, subgrade materials and subgrade construction technology, especially for subgrade fillers and subgrade filling requirements. Considering the different geological conditions in different

Method used

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  • Construction method using modified collapsible loess as roadbed filler
  • Construction method using modified collapsible loess as roadbed filler
  • Construction method using modified collapsible loess as roadbed filler

Examples

Experimental program
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Embodiment 1

[0059] like figure 1 As shown, the construction method using improved collapsible loess as roadbed filler in this embodiment includes: construction measurement lofting, material loading, primary leveling, cement spreading, mechanical mixing, secondary leveling, rolling, compaction In the test, the filler is loess mixed with cement, and the cement is mixed into the loess by external admixture method, and the amount of admixture is 4%, 5% or 6%. The percentage of soil mass, that is, calculated by mass percentage, see the following formula:

[0060]

[0061] The concrete method of this embodiment:

[0062] Construction measurement and stakeout:

[0063] 1. According to the accuracy required by the design documents and the "Highway Survey Specification", review the original coordinate points, elevation points, encrypted traverse points, and benchmark points according to the construction requirements. Restoring the center line of the route, adding temporary benchmarks, so as ...

Embodiment 2

[0101] This Example In this example, the improved collapsible loess is used as the construction method of the subgrade filler. On the basis of Example 1, the amount of cement is determined through experiments, and the physical properties of the cement-improved loess are tested for liquid-plastic limit, Compaction test, shear strength test, unconfined compressive strength test, CBR test, collapsibility test were done for mechanical properties. Through the analysis of the test data, it is shown that 4%, 5%, 6% cement content is better in improving loess, and it is more economical. The specific test method is as follows:

[0102] 1. The liquid-plastic limit joint tester was used in the test to measure the liquid-plastic limit of cement-improved loess:

[0103] Air-dry the disturbed loess samples in the borrow area, and sieve through a 0.5mm sieve. Take 4 representative soil samples of 200g in each borrow area, and the mixing ratios are 1%, 2%, 3%, and 4% respectively. , 5%, 6%, ...

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Abstract

The invention relates to a construction method using modified collapsible loess as roadbed filler and is designed for realizing roadbed filling by using modified loess. The construction method using the modified collapsible loess as the roadbed filler comprises construction survey and setting out, feeding, primary leveling, cement spreading, mechanical mixing, secondary leveling, roller compactionand compaction degree detection, wherein the filler is cement-incorporated loess, in which the cement is incorporated into the loess in an admixing method, and the admixture content is 4%, 5% or 6%.According to the invention, special treatment measures are taken on collapsible loess that could not be used in the past, to make the collapsible loess to be used as the roadbed filler, thus the organic combination of farmland, ecological protection and sustainable development of waste recycling is realized, and the construction method is of great significance to the treatment of roadbed engineering in loess areas.

Description

technical field [0001] The invention relates to the field of highway construction, in particular to a construction method using improved collapsible loess as roadbed filler. Background technique [0002] The construction of transportation infrastructure in Qinghai is constantly increasing. However, roadbed construction in collapsible loess areas is particularly important due to settlement problems. Highway subgrades need to adopt high standards in terms of subgrade structure, subgrade materials and subgrade construction technology, especially for subgrade fillers and subgrade filling requirements. Considering the different geological conditions in different regions, it is necessary to solve the subgrade with loess improved filler. There are technical problems in highway subgrade construction. At present, there are few related studies on loess improvement as highway subgrade filler in China, and there is no complete and mature method to solve this problem. [0003] In view ...

Claims

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Application Information

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IPC IPC(8): E01C3/00E01C3/04
CPCE01C3/00E01C3/04
Inventor 曾庆伟孙雪伟郎卫军朱春明王军艳闫鹏远
Owner JIANGSU SINOROAD ENG TECH RES INST CO LTD
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