A combined DJM-PVD method for soft ground improvement-Reference-Cited by-同舟云学术

A combined DJM-PVD method for soft ground improvement

Published:2008-01 Issue:1 Volume:15 Page:43-54
ISSN:1072-6349
Container-title:Geosynthetics International
language:en
Short-container-title:Geosynthetics International

Author:

Liu S. Y.¹,Han J.²,Zhang D. W.³,Hong Z. S.⁴

Affiliation:

1. Institute of Geotechnical Engineering, Southeast University Nanjing, China Telephone: +86 25 83792885, Telefax: 86 25 83795086,

2. Department of Civil, Environmental, and Architectural Engineering, The University of Kansas Lawrence, KS 66047, USA Telephone: +1 785 864 3714, Telefax: 1 785 864 5631,

3. Institute of Geotechnical Engineering, Southeast University Nanjing, China Telephone: +86 25 83795776, Telefax: 86 25 83795086,

4. Institute of Geotechnical Engineering, Southeast University Nanjing, China, Telephone: +86 25 83792220, Telefax: 86 25 83795086,

Abstract

Dry jet mixing (DJM) and prefabricated vertical drains (PVDs) have been successfully used for soft ground improvement worldwide. They both have advantages and limitations, and have been used independently so far. In this study, DJM and PVDs were used in combination to enhance the performance of soft ground improvement. In the combined method, PVDs are first installed and then DJM columns are installed between the PVDs at larger spacing. This combined method improves the effectiveness of ground improvement and creates a more economical solution. This paper presents the concept, mechanisms, construction procedures, and field validation of this new method. In situ standard penetration tests were performed in dry mixed columns and cone penetration tests and field vane shear tests were performed in soils between the columns. Plate load tests were subsequently conducted on the treated ground. Excess porewater pressures were monitored during and after the installation of DJM columns with and without PVDs. Field validation was conducted through a pilot highway embankment on very soft clay in Jiangsu, China. Long-term settlement monitoring was carried out for the construction of this highway embankment. Field tests and monitoring clearly showed that the DJM-PVD method performed well in enlarged spacing as compared with the conventional DJM method with close spacing.

Publisher

Thomas Telford Ltd.

Subject

Geotechnical Engineering and Engineering Geology,Civil and Structural Engineering

Link

https://www.icevirtuallibrary.com/doi/pdf/10.1680/gein.2008.15.1.43

Reference21 articles.

1. Behavior of Vertical Drain Improved Subsoil Under Embankment Loading

2. China Building Research Institute. Chinese Technical Code for Ground Improvement for Buildings (JGJ 79-2002), 2002, China Architecture and Building Press, Beijing, 200, (in Chinese).

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