Ground Improvement Using Vacuum Loading Together with Vertical Drains

Mesri, G.; Khan, Abdul Qudoos

doi:10.1061/(asce)gt.1943-5606.0000640

Cited by 80 publications

(36 citation statements)

References 20 publications

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“…Chu et al (2000) reported that for a 20 m deep very soft clay deposit, the applied vacuum pressure was fully developed to 14 m bgl, with approximately 80% achieved at greater depths. However, the uniformity of the vacuum may also be affected if the soil profile is highly stratified (Mesri and Khan, 2012).…”

Section: Factors Affecting Pvd Performancementioning

confidence: 99%

“…However, the surcharge loading required to ensure such deposits undergo acceptably low amounts of settlement post-construction are often so large that, in maintaining an adequate factor of safety against slope instability, it may prove rather time consuming to apply the necessary fill layers. In this regard, use of the vacuum consolidation technique in conjunction with surcharge preloading and PVDs can enhance the efficiency of ground improvement works (Chu et al, 2000;Indraratna, 2010;Mesri and Khan, 2012). The vacuum preloading technique, originally proposed by Kjellman (1952), has over the past three decades evolved to become a viable, more cost-effective solution for ground improvement projects worldwide (see Table 1).…”

Section: Introductionmentioning

confidence: 99%

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Ground improvement by vacuum consolidation – a review

Griffin

O’Kelly

2014

Proceedings of the Institution of Civil Engineers - Ground Impr

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This paper presents a review of literature related to the vacuum consolidation ground improvement technique, focusing on issues affecting efficiency of performance and the application of the technique in peaty ground.Although it is now widely considered to be effective for reducing post-construction settlement, studies on vacuum consolidation in peat have, to date, mostly been limited to field trials. This paper offers an overview of the development and theory behind the technique. Issues affecting the efficiency of vacuum systems and recent advances in predicting the ground response to vacuum preloading are described. The application of the technique in peaty soils is investigated; an overview is also provided of some geotechnical properties that distinguish peat from soft mineral soils, highlighting lessons learned from relevant case studies.

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Section: Factors Affecting Pvd Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ground improvement by vacuum consolidation – a review

Griffin

O’Kelly

2014

Proceedings of the Institution of Civil Engineers - Ground Impr

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“…e current methods for calculating lateral displacement of soil consist of the strain method (the horizontal displacement at the boundary is calculated based on the strain of the soil in the treated area) [1] and the method of determining the ratio of the settlement and lateral displacement [4]. It is noteworthy that the above methods are not used to solve the deformation of the soil influenced by the different lengths of a prefabricated vertical drain (PVD).…”

Section: Introductionmentioning

confidence: 99%

Estimation of Influence Scope of Lateral Displacement of Soft Ground under Vacuum Pressure with PVD

Liu

Wang

et al. 2018

Advances in Civil Engineering

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e application of vacuum pressure to a treated area not only induces vertical settlement and inward lateral displacement but also causes the formation of tension cracks near the ground surface. In general, the strain method is applied to calculate the lateral displacement at the boundary of a treated area; however, the influence scope of lateral displacement has not yet been presented. Based on the in situ data of soft clayey soil foundation treated by vacuum consolidation, lateral displacement was estimated in the influence scope in this study. To calculate the influence scope of lateral displacement induced by vacuum pressure, the ratio of the lateral displacement within the influence scope to the ground surface settlement under the centre of the treated area is defined as the maximum value of the lateral displacement (ELD) within the influence scope. is paper proposes a direct relationship between ELD and the distance from the treated area boundary (L x ), considering the length of the prefabricated vertical drain. In addition, the FEA (finite-element analysis) is used to simulate the process of vacuum preloading to reinforce soft soil foundation.e influence scope simulated is almost close to the calculated value L x . Accordingly, the safety distance between the boundary of the treated area and the surrounding building can be estimated when the soft soil foundation is consolidated by using a vacuum preloading method.

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“…During the improvement process, the concerning problem is the settlement during/after the improvement. Numerical calculation is the most common method to predict the settlement [1][2][3][4]. In this paper, the settlement of the ground is numerically calculated by regarding the embankment as equivalent load.…”

Section: Introductionmentioning

confidence: 99%