Comparison between Theory (Numerical simulation by the PLAXIS 3D – Finite element method) and Experiment measurement by the Viet Nam Standard “TCVN 4195:2012; TCVN 4199:1995” for the Dry Density and Shear Stress Variations with the different Depths (groundwater level variations) were shown clearly with the particular process. Results show the Dry unit weight (density) increases gradually with the increase of different depths. The maximum deviation of the dry unit weight (dry density) and Shear Stress according to the constant loading (P) at the different depths, which included in the dry density (γk) value of 16.26 kN/m2 and shear stress (τmax) 72.7 kN/m2 at 4.3m; whereas shear stress (τmax) 41.6 kN/m2; 27.1 kN/m2; 91.8 kN/m2; 98.2 kN/m2; 82.9 kN/m2 at 7.0m; 18.0m; 27.0m; 30.3m, and 39.6m; respectively. Results show the small deviation together, but some values presented changing remarkably. So research results enough reliable reference in the geotechnical engineering and researchers in the future.

Numerical model (PLAXIS 3D or finite element method) of the Shear Stress Variations with the groundwater level variations presented by the Viet Nam Standard “TCVN 4195:2012”. Results show the value of the maximum shear stress show τmax = 150.7 kN/m2 at Depth 5.0m; τmax = 159.7 kN/m2 at depth 8.0m; τmax = 192.6 kG/cm2 at depth 15.0m; τmax = 219.4 kN/m2 at depth 27.0m. The shear stress increase gradually with the increasing of depths with the constant loading Psn = 50 kN/m2. At the 5.0m; 8.0m; 15.0m; 27.0m depth, the deviation shows the value of 72.7 kN/m2; 72.7 kN/m2; 41.6 kN/m2; 27.1 kN/m2; 91.8 kN/m2. This deviation is very big between the experiment and simulation.

The paper objective presents the Field measurement of the Rubble Masonry Ground Deformation under Consideration of the Jackfruit Tree Development after 8 years. Results show the crack’s appearance on the grout surface which made small fragments with different lengths and diameters areas sizes. The maximum values of the depths, widths, and lengths of cracks show 30mm, 35mm, and 90 mm; whereas the maximum length appeared on the surface area sizes of 2.350m at the stool; compared with the minimum value of 5mm distance 1.5m. On the other hand, the brick lining increasing the pavement obtained 7cm. Moreover, the development cycle of the jackfruit was done carefully by the Vietnam Standard which included care time, fertilizer, and water supply cycle. Results described particularly in the heights, diameters, and years old as 3 months, 1 year, 3 years, 5 years, and 8 years: 0.3mx15cm; 1.2mx35cm; 2.5mx58cm; 4.0mx72cm; and 6.0x99cm. In conclusion, the research results can use for the references for civil, road, and geology engineering to forecast and it is not recommended to plant jackfruit trees near the ground of houses, pavements, and roads a distance of less than 5m; replace with a distance of rather than 5m to be safe ground.

Evaluation and research on the aggressive degree to concrete were done in the previous research. However, the evaluation of aggressive certain degree in water to the concrete was evaluated comprehensively by the Viet Nam Standard “TCVN 3994:1985” and ISO 14911:1998. The results presented “water with chemical characteristics can’t create the aggression in concrete”, which shows pH concentration is 5 and CO2 corrosion is 20 mg/l; whereas ion Mg2+ is 1.5 g/l and SO42− is 0,25 g/l. The total salt content in the presence of evaporating surface obtains 12,5g/l. On the other hand, this paper considers water with the chemical name “Chlorite-Bicarbonate-Sodium-Magnesium” by the Kurlov formula and “TCVN 81:1981”. Especially, comprehensive consideration of chemical analysis that includes Cation (Ca2+; Mg2+; ∑(Fe2+; Fe3+; Na+; K+; and NH4+); Anion (Cl−; SO42−; HCO3−; CO32− and OH−); and the other special items analysis which includes Permanent and Temporary hardness; Alkalinity; CO2 free; CO2 corrosive; Total mineralization; pH value; Nitrite (NO2−); and Nitrate (NO3−). So research results can be used safely for the design or construction of the reinforcement concrete structures in My Thai Canal Bridge, Rach Gia town, Kien Giang province, Viet Nam, and Construction or Geotechnical as good reference documents in the future.

In recent decades, settlement differences of the Clay ground implemented in areas and countries in the world. Whereas marine clay ground behaviors under Rigid foundation to build the construction on the clay ground with marine clay origin was evaluated the different methods such as Field and experimental measuring method, Finite Element method, formulas or TERZAGHI method and so on. Moreover, the influence of the groundwater levels is one of the most quite important problems to be needed considering. The object of this paper uses Standard Penetration (SPT), Unconfined Compression Test, and TERZAGHI formula, groundwater effects, and simulation by the software for measuring the vertical displacement (or settlement differences) of the rigid foundation on marine clay origin ground at Vinh Quang ward, Rach Gia town, Viet Nam. Results of the paper described clearly for settlement differences (vertical displacement) of the Rigid foundation as building loading with a comparison between Field, experimental, and software simulation so it can consult effectively for design and doing construction works in Civil and Geology Engineering.