|Table of Contents|

Research on road performance of improved expansive soil in Xinxiang area(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2024年05期
Page:
163-172
Research Field:
岩土工程
Publishing date:

Info

Title:
Research on road performance of improved expansive soil in Xinxiang area
Author(s):
WANG Huan1; 2;  ZHANG Feiyang1;  CAO Yikang3;  WANG Jianqi4;  YAN Chao1;  ZHAO Xiangyang4
(1.School of Civil Engineering and Architecture, Henan University, Kaifeng 475004, Henan, China; 2. Highway Institute, Henan College of Transportation, Zhengzhou 451460, Henan, China; 3. The Second Construction Limited Company of China Construction Eighth Engineering Division, Jinan 250022, Shandong, China; 4. Xinpu Construction Group Co., Ltd., Zhengzhou 450046, Henan, China)
Keywords:
improved expansive soil;  road performance;  CBR;  freeze-thaw cycle;  expansion rate;  Xinxiang area
PACS:
TU443
DOI:
10.19815/j.jace.2022.10048
Abstract:
In order to reduce the harm of expansive soil to highway engineering, silt and polyvinyl alcohol(PVA)fiber were used to improve the weak expansive soil in Xinxiang area, and the road performance of the expansive soil before and after improvement was studied. Through the California bearing ratio(CBR)test, freeze-thaw cycle test and unconfined compressive strength test, the influence rules of expansion rate, CBR and freeze-thaw cycle on unconfined compressive strength of different samples were studied. The results show that the expansion ratios of plain expansive soil, 30% silt improved expansive soil and 30% silt+0.2% PVA fiber improved expansive soil increase with the increase of compactness and decrease with the increase of water content. CBR increases with the increase of compactness and increases first and then decreases with the increase of water content. 30% silt+0.2% PVA fiber has the best effect on improving expansive soil. At the best water content, the expansion rate can be reduced by 59.76% and the CBR can be increased by 467%. With the increase of freeze-thaw cycles, the unconfined compressive strength of expansive soils decreases and tends to be stable, and the first freeze-thaw cycle has the greatest impact on the strength of soils. With the addition of PVA fibers, the residual strength of soil after freeze-thaw cycles is still greater than that of the original plain expansive soil, and the stress-strain curve of the soil changes from softening to weakening. Silt and PVA fibers can effectively improve the undesirable properties of expansive soil and significantly improve its bearing capacity and frost resistance.

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Last Update: 2024-09-30