NUMERICAL MODELLING OF SOFT SOIL STABILIZED BY VERTICAL DRAINS FOR CAMAU POWER PLANT CONSTRUCTION PROJECT IN VIETNAM
UDC: 624.159.2
DOI: -
Authors:
Vasiliyev Gennadiy G.
1,
Nguyen Phan Anh1,2
1 Gubkin Russian State University of Oil and Gas (National Research University2 PetroVietnam University
Keywords: vertical drain, consolidation, clay, saturated soil
Annotation:
The construction site of the CaMau power plant is located on a 17m thick layer of soft clay with very poor characteristics. The proposed method of increasing the load-bearing capacity of the soil is based on vacuum sealing and installation of vertical drains with surcharge in the form of a sand mound. The purpose of this paper is to construct a ground behavior model for installing vertical drainage to test the analytical solutions to the theories of Baron (1948) and Hansbo (1981) as well as application of this model under actual fill conditions on the field to determine the change in pore pressure, the degree of consolidation and forecasting the size of the draft of weak soils in the construction project of the Ka Mau station. The model is the basis for further study of the change in soil characteristics during vacuum consolidation. An acceptable coincidence was established between simulation results and analytical solutions.
Bibliography:
1. Yoshikuni H., Nakanodo H. Consolidation of soils by vertical drain wells with finite hydraulic conductivity//Soil Found. — 1974. — Vol. 2. — No. 14. — P. 35-46.
2. Onoue A. Consolidation by vertical drains taking well resistance and smear into consideration//Soil Found. — 1988. — Vol. 4. — No. 28. — P. 165-174.
3. Barron R.A. Consolidation of fine-grained soils by drain wells//Transactions ASCE. — 1948. — No. 113. — P. 718-724.
4. Hansbo S. Consolidation of fine-grained soils by prefabricated drains. Proceedings 10th International Conference on Soil Mechanics and Foundation Engineering. Stockholm. — 1981. — No. 3.
5. Terzaghi K. Die Berechnungder Durchlassigkeitszifferdes Tonesausdem Verlaufder Hydrodynamischen Spannungserscheinungen, Akademieder Wissenschaftenin Wien, Sitzungsberichte//Math. naturw. Klasse, Part IIa. — 1923. — Vol. 132. — No. 3-4. — P. 125-l38//Reprinted in From Theory to Practice in Soil Mechanics, Wiley, New York. — 1960. — P. 133-146.
6. Indraratna B., Redana I.W. Numerical modeling of vertical drains with smear and well resistance installed in soft clay//Can Geotech J. — 2000. — No. 37. — P. 132-145.
7. Varaksin Serge. Theory and Practical Application of Vacuum Consolidation at the site of Camau Power Plant in Vietnam. Proc. workshop on Soft Soil Improvement and Foundation Techniques. — Vietnam. — 2007.
8. Bo M.W., Chu J., Low B.K. and Choa V. Soil improvement prefabricated vertical drain techniques//Thomson Learning. Singapore. - 2003.
9. Васильев Г.Г., Нгуен Ф.А. Обеспечение устойчивости нефтегазовых сооружений в инженерно-геологических и гидрогеологических условиях территории Вьетнама//Трубопроводный транспорт (теория и практика). — 2016. — № 5. — C. 41-43.
10. Васильев Г.Г., Нгуен Ф.А. Моделирование процессов термической фильтрационной консолидации грунтового основания РВС на слабых водонасыщенных грунтах//Транспорт и хранение нефтепродуктов и углеводородного сырья. — 2017. — № 1. — C. 5-8.
Back to issue