Abstract
Combined with the Dingxi-Lintao Expressway, this paper discusses the method of strengthening the collapsible loess foundation, and conducts the indoor California Bearing Ratio (CBR) test research according to the characteristics of the highway project. Under the optimal water content, through the comparison analysis of the test results of the plain soil California Bearing Ratio test and the lime soil California Bearing Ratio test after the ash mixing ratio reaches 5%, it can be found that under the condition that the compaction degree reaches 96%, the test result after ash mixing is 5% The CBR value of this kind has been greatly improved, and the expansion amount has been drastically reduced. It is proved that this treatment method can eliminate the adverse effects of collapsible loess, significantly increase the bearing capacity of the foundation, and provide good guidance for the subsequent roadbed treatment design and construction.
Highlights
In highway engineering, the collapsible loess roadbed shows obvious collapsibility after encountering water, and the bearing capacity often does not meet the design requirements, which causes the roadbed to settle and become unstable, which is more harmful and requires foundation treatment.The Dingxi-Lintao Expressway is located in the west of the Longxi Loess Plateau, and loess-like soils of aeolian and alluvial origin are widely distributed along the line
The dynamic compaction method is suitable for treating collapsible loess with saturation not greater than 60%
At a compaction degree of 96%, the California Bearing Ratio CBR value of lime soil is about 3.9~5.0 times higher than that of plain soil
Summary
The collapsible loess roadbed shows obvious collapsibility after encountering water, and the bearing capacity often does not meet the design requirements, which causes the roadbed to settle and become unstable, which is more harmful and requires foundation treatment. The Dingxi-Lintao Expressway is located in the west of the Longxi Loess Plateau, and loess-like soils of aeolian and alluvial origin are widely distributed along the line. According to the statistics of indoor collapsibility test results, the proportion of collapsible loess samples is 65.5%. Most of the collapsible loess is self-weight collapsible loess, and the collapsibility is mostly medium to strong, which cannot meet the engineering requirements. It is obviously very important to select an appropriate foundation treatment method to eliminate the adverse effects of collapsibility and effectively improve the bearing capacity of the roadbed
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