http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/7489 2026-05-17T08:47:56Z 2026-05-17T08:47:56Z Kirov, B. L. Nguyen, Ngoc Truc http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/7549 2011-05-18T09:20:45Z 2010-01-01T00:00:00Z

Influence of Saturated Medium on Geotechnical Characteristics of Soils Kirov, B. L.; Nguyen, Ngoc Truc The paper mentions in a real problem happened in the dumping ground, the industrial activity area or coastal area, that is the contamination of pollutant in the ground. The ground contaminated by seawater or chemically polluted water will lead to the changes in construction characteristics of the soils. The testing on influence of waste water on soil deformation was carried out on loess soil and clay paste when they were saturated with pure water, crude oil and detergents. The change of parameters especially compressibility of loess and clay paste when these soils were saturated by pure water, salty water and detergents had been investigated. Besides, undisturbed clayey samples were also tested in saturated condition with salty water. The results of the tests show that the soils saturated by detergents will increase their deformation and compression, however, they become inversely in case of soil saturation by crude oil. When soils saturated by salty water, the change of their parameters is on contrary depending on soil’s mineral composition.

2010-01-01T00:00:00Z Vu, Bao Ngoc Nguyen, Tien Dung Suneel, Matchala http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/7545 2011-05-18T09:13:59Z 2010-01-01T00:00:00Z

Vacuum Preloading Consolidation Method, A Case Study of Dinh Vu Polyester Plant Vu, Bao Ngoc; Nguyen, Tien Dung; Suneel, Matchala This case study presents the design, operation, and results of a soil improvement project using the vacuum preloading method on the area of 12,0000m2 for Dinh Vu Polyester Plant in Dinh Vu, Haiphong, Vietnam. The effects of soil improvement are demonstrated through the average consolidation settlement of 1.2 m and increases in undrained shear strengths by a factor of two to four or more. The study shows that the vacuum method is an effective tool for the consolidation of very soft, highly compressive clayey soils and loose sandy soils over a large area. This technique is especially feasible in cases where there is a lack of surcharge loading fills, short time schedule of project, extremely low shear strength, soft ground adjacent to critical slopes, feasibility to construction of clay/mixing wall to protect vacuum through sand layers and access to a power supply.

2010-01-01T00:00:00Z Tran, Thuong Binh Nguyen, Huy Phuong http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/7544 2011-05-18T09:08:42Z 2010-01-01T00:00:00Z

Types of Dynamic Strengths of Soils and Methods of their Determination Tran, Thuong Binh; Nguyen, Huy Phuong The practice has shown that dynamic loadings are numerous, but there are only two types of reaction on the foundation soils: 1) active reaction due to direct cycling impact from the foundation machine, pile driving etc., 2) passive reaction due to the seismic effect from earthquakes, from transportation vehicles etc. Based on the analysis of the elastic, elastic-plastic and linear vibration theories, results of the study on the change of soil physico-mechanical parameters under the impact of the dynamic loadings 4,7,9,12 and based on the point of view of discrete medium dispersion system 15,21, this work had clarified the dynamic strength through dynamic cycling strength-characteristic seismic extreme dynamic strength for the passive and active reactions of the foundation soils. Simultaneously, mathematical expressions of the characteristic coefficients of various types of dynamic shearing strengths are presented and method of their determination is proposed.

2010-01-01T00:00:00Z V. K., Singh S. G., Chung Y.P., Hong H. J. , Kweon http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/7541 2011-05-18T09:02:35Z 2010-01-01T00:00:00Z

Evaluation of Undrained Shear Strength of Pusan Clay Using in-situ Tests V. K., Singh; S. G., Chung; Y.P., Hong; H. J. , Kweon Busan clay, usually varying from 20 to 70m thick, is widely deposited along the coastline in the Nakdong River deltaic area located west of Busan City in Korea. Despite many geotechnical investigations for various reclamation projects, the properties of the clay have not been yet elucidate due to their spatial variation and inadequate undisturbed sampling. The undrained shear strength of the clay is interpreted using the flat dilatometer (DMT) with various existing empirical equations. The results are compared with each other, and correlated with the corrected undrained shear strength obtained from the field vane shear test (Su(FVT)). The results indicated that the KD–based empirical equation proposed by Marchetti (1980) slightly underestimates the Su(FVT) values on the clay.Empirical equations based on Su-KD and Su-ED-ID relationshipsare developed for the clay. The undrained shear strengths estimated from theSu-ED-ID relation give the closest correlation.

2010-01-01T00:00:00Z