Optimal design of prefabricated vertical drain-improved soft ground considering uncertainties of soil parameters

Sun, Hongyue; Wang, Jun; Wang, Dongfei; Yu, Yong; Wei, Zhenlei

doi:10.1631/jzus.a1900227

Cited by 5 publications

(3 citation statements)

References 38 publications

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“…PVDs are a practical choice for soil improvement when settlement exceeds the allowable limit. The length and spacing of PVDs are important design parameters, with a recommended total penetration length in soft clay [9]. Partial penetration is a costeffective option for deep soft soil layers.…”

Section: Soil Improvement Using Pvdsmentioning

confidence: 99%

“…Initial PVD research focused on enhancing soft clay conditions in southern Vietnam, followed by performance evaluation, model testing, and numerical modeling [5][6][7]. PVDs also find applications beyond Vietnam, such as settlement studies in Istanbul, Turkey, and optimal design for soft ground in China [8,9]. These global cases highlight the broad significance and potential of PVDs for ground improvement.…”

Section: Introductionmentioning

confidence: 99%

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Roadway Settlement Characteristics on Mekong Delta for Various Landforms

Vo Ai Mi

2023

GEOMATE

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The road network in the Mekong Delta faces challenges due to its low-lying topography and extensive layers of soft clay. These deposits, reaching depths of up to 25 m, are found in backswamp/swamp, sand dune, and mangrove marsh landforms. These soils generally have low total unit weight, high water content, and high compressibility. They are problems for road construction, and soft ground treatment must be applied. This study utilized data from 53 boreholes to assess the consolidation characteristics of each landform. According to the typical highway embankment construction, the primary consolidation showed the highway settlement in the ranges 186-1,174 mm, 107-1,049 mm, and 537-1,364 mm for the backswamp/swamp, sand dune, and mangrove marsh, landforms, respectively. These settlements exceed the maximum level of 250 mm for allowable settlement at 5 years post-construction. To address this issue, the prefabricated vertical drain (PVD) method is proposed as a solution to expedite settlement. PVDs, designed with 12-14 m, 10-12 m, and 14-16 m for the backswamp/swamp, sand dune, and mangrove marsh landforms, respectively, and a spacing of 1 m, accelerated the consolidation process, resulting in consolidation percentages of 87-92% within a notably shortened timeframe of 3 months through preloading. Upon completion of the preloading period, the remaining settlement ranges were 54-130 mm, 27-83 mm, and 67-170 mm for the backswamp/swamp, sand dune, and mangrove marsh landforms, respectively, which are all within the permissible limit (250 mm). These findings are important, as they offer valuable insights for the future planning, preliminary design, and construction of highway embankments, emphasizing the importance of incorporating PVDs as an effective measure in mitigating settlement issues.

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Section: Soil Improvement Using Pvdsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Roadway Settlement Characteristics on Mekong Delta for Various Landforms

Vo Ai Mi

2023

GEOMATE

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“…Ren et al [10] deduced the calculation formula of the bed coefficient with the compressive modulus as a known parameter and compared it with the empirical value given by the specification. At present, in geotechnical engineering surveys, in situ tests such as K 30 plate load test, spiral plate load test, side pressure test, and flat shovel side expansion test as well as indoor consolidation method and triaxial method are mainly employed to test the bed coefficient [11][12][13][14][15][16][17][18]. However, due to the influence of test equipment and sample size, the values obtained by different test methods are quite different [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Research on Test Method of Foundation Bed Coefficient in Nanjing Soft Soil Area

Zhang

Qiu

2021

Geofluids

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Relying on the geotechnical engineering survey project of Nanjing Lukou Airport, this research adopts the method of combining in situ and indoor testing to analyze the coefficient of soil foundation under different conditions (flow plastic, plastic, and soft plastic). Based on the differences in test results, in situ and indoor test methods appropriate for the benchmark bed coefficient of Nanjing soft soil area are proposed. Research findings depicted that the bed coefficients obtained by different methods are not similar; therefore, if the data obtained by different methods need to be compared and analyzed, they have to be unified as K 30 . Simultaneously, in the indoor test, this study compared the foundation bed coefficient obtained by the consolidation method, the improved K 0 instrument consolidation method, and the triaxial method. Results revealed that the improved K 0 instrument consolidation method can better realize the test of the soil foundation coefficient. This study can provide a reference for geotechnical investigation and design of soft soil in the study area.

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