Back-Calculation of Soil Modulus from PFWD Based on a Viscoelastic Model
To improve the accuracy of back-calculation of soil modulus using the portable falling weight deflectometer (PFWD), a viscoelastic method (VEM) overcoming the limitations of the conventional linear elastic method (LEM) was proposed. A quasi-static dynamic analysis technique of Laplace transformation...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/1316341 |
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| _version_ | 1832550949491572736 |
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| author | Rui Zhang Tianzeng Ren Md Ashrafuzzaman Khan Yusheng Teng Jianlong Zheng |
| author_facet | Rui Zhang Tianzeng Ren Md Ashrafuzzaman Khan Yusheng Teng Jianlong Zheng |
| author_sort | Rui Zhang |
| collection | DOAJ |
| description | To improve the accuracy of back-calculation of soil modulus using the portable falling weight deflectometer (PFWD), a viscoelastic method (VEM) overcoming the limitations of the conventional linear elastic method (LEM) was proposed. A quasi-static dynamic analysis technique of Laplace transformation and a modified Gauss–Newton optimization algorithm were adopted in the proposed method. The back-calculation program was compiled with MATLAB. The effectiveness of the proposed method was verified with the in situ plate load test (PLT) conducted on a highway embankment. In situ test results showed that a time lag existed between the peaks of deflection and load, and load-deflection curves were nonlinear, which indicated the viscoelastic nature of the soil. The back-calculated modulus using the LEM and VEM was higher than that using the PLT. In the case of low stiffness soil, the average error of back-calculation using the LEM and VEM was 53.1% and 14.8%, respectively. However, for stiffer soil, the average error of back-calculation using the LEM and VEM method was 12.4% and 4.3%, respectively. Moduli of back-calculation using LEM and VEM methods were used to perform flexible pavement analysis, which showed that with an 8% reduction of modulus, the pavement service life reduced by 25%. More accurate estimation of modulus can save maintenance cost in the future. |
| format | Article |
| id | doaj-art-009048bb7a7b45c79f7e63d7bed738b9 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-009048bb7a7b45c79f7e63d7bed738b92025-02-03T06:05:23ZengWileyAdvances in Civil Engineering1687-80861687-80942019-01-01201910.1155/2019/13163411316341Back-Calculation of Soil Modulus from PFWD Based on a Viscoelastic ModelRui Zhang0Tianzeng Ren1Md Ashrafuzzaman Khan2Yusheng Teng3Jianlong Zheng4National Engineering Laboratory for Highway Maintenance Technology, Changsha University of Science & Technology, Changsha, Hunan 410114, ChinaSchool of Traffic and Transport Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, ChinaCivil and Environmental Engineering, Texas A&M University, College Station, TX 77840, USASchool of Traffic and Transport Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, ChinaNational Engineering Laboratory for Highway Maintenance Technology, Changsha University of Science & Technology, Changsha, Hunan 410114, ChinaTo improve the accuracy of back-calculation of soil modulus using the portable falling weight deflectometer (PFWD), a viscoelastic method (VEM) overcoming the limitations of the conventional linear elastic method (LEM) was proposed. A quasi-static dynamic analysis technique of Laplace transformation and a modified Gauss–Newton optimization algorithm were adopted in the proposed method. The back-calculation program was compiled with MATLAB. The effectiveness of the proposed method was verified with the in situ plate load test (PLT) conducted on a highway embankment. In situ test results showed that a time lag existed between the peaks of deflection and load, and load-deflection curves were nonlinear, which indicated the viscoelastic nature of the soil. The back-calculated modulus using the LEM and VEM was higher than that using the PLT. In the case of low stiffness soil, the average error of back-calculation using the LEM and VEM was 53.1% and 14.8%, respectively. However, for stiffer soil, the average error of back-calculation using the LEM and VEM method was 12.4% and 4.3%, respectively. Moduli of back-calculation using LEM and VEM methods were used to perform flexible pavement analysis, which showed that with an 8% reduction of modulus, the pavement service life reduced by 25%. More accurate estimation of modulus can save maintenance cost in the future.http://dx.doi.org/10.1155/2019/1316341 |
| spellingShingle | Rui Zhang Tianzeng Ren Md Ashrafuzzaman Khan Yusheng Teng Jianlong Zheng Back-Calculation of Soil Modulus from PFWD Based on a Viscoelastic Model Advances in Civil Engineering |
| title | Back-Calculation of Soil Modulus from PFWD Based on a Viscoelastic Model |
| title_full | Back-Calculation of Soil Modulus from PFWD Based on a Viscoelastic Model |
| title_fullStr | Back-Calculation of Soil Modulus from PFWD Based on a Viscoelastic Model |
| title_full_unstemmed | Back-Calculation of Soil Modulus from PFWD Based on a Viscoelastic Model |
| title_short | Back-Calculation of Soil Modulus from PFWD Based on a Viscoelastic Model |
| title_sort | back calculation of soil modulus from pfwd based on a viscoelastic model |
| url | http://dx.doi.org/10.1155/2019/1316341 |
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