Papers by Keyword: Field Test

Abstract: The main aim of this research can be represented as a trail to computerize the most soil engineering properties to compute them automatically using many simple Microsoft Excel functions based on raw soil test experimental data. This work will be shortening the time and effort of the geotechnical engineers calculating different soil parameters with acceptable accurate values. Nine different Microsoft Excel formulas, some of the techniques by certain Excel expressions and normal designed algebraic equations were used to present the final spreadsheet. The main computed soil parameters were (ω, LL, PL, PI, ρ_d,max, ω_opt, k) soil classification AASHTO, (q_u and c_u) for unconfined compression test, (ø and c') for the direct shear test finally (Cc and Cs) for consolidation tests. To get a better understanding on how most of the programmed tools and to Microsoft Excel sheets work, the user should have knowledge about basic concepts of the certain soil parameter test and experimental steps and also the guidelines of the theory that depends to compute the parameter. Also, the user should have enough background about engineering soil properties laboratory experiments computation.

Abstract: Gypseous considered as problematic soils also gypseous soils are distributed all over the world, as well as in large areas of Iraq, including Al- Najaf city. Gypseous soils are characterized by high strength in dry conditions, but they collapse due to water infiltration process under constant head conditions. In this research, a field study investigates gypseous soils and the effect of soaked state on the bearing capacity and settlement of the gypseous soils are investigated. A site with a high percentage of gypsum (about 25%) was selected to perform plate load tests. The test was carried out in a natural and soaked state on the gypseous soils by plate load test with time-dependent. The results show the ultimate bearing capacity of gypseous soil from plate load test are decrease under the soaking condition and maximum settlement increase. The angle of internal friction (ø) of gypseous soil we obtained from the direct shear test is 47.62⁰ for natural soil. The ultimate bearing capacity of gypseous soil was calculated from the Terzaqhi’s equation and the high difference between field tests and theoretical results.

Abstract: This paper deals with the investigation of the corrosion situation of oil wells on site. On the basis of water quality analysis, the corrosion status of the site was studied on J55 steel used in the field. The most severe water sample was selected as the medium for electrochemical evaluation and on-site. The screening of four corrosion inhibitors was conducted in our study. Results showed that the salinity of the produced water is relatively high (average value of 29819 mg/L), the chloride ion content is high (average value of 17762.8 mg/L), and the corrosion rate is up to 0.1345 mm/a. Scanning electron microscopy (SEM) was used to analyze the corrosion products and morphology of the studied samples. In the electrochemical evaluation test, the TS-001 corrosion inhibitor has a good corrosion inhibition rate, which can reach up to 97.75% when the dosage is 100 mg/L.

Abstract: The cooling water intake pipeline constructed in the nuclear power plant is mostly made of steel or concrete. However, they have some disadvantages such as reduced durability due to wear and corrosion caused by sea water, defects in connections, breakage of pipelines, and difficulties in continuous maintenance. To mitigate the presented problems, recently, the research on durable and outstanding corrosion resistant glass fiber reinforced polymer plastic (GFRP) pipe has been actively conducted. In this experimental study, 2400 mm (94.49 in) diameter of GFRP pipe specimen is investigated. The field test was planned to measure ring deflection of buried GFRP pipe. In addition, the design method proposed by American Water Works Association (AWWA) M 45 was applied to compute the ring deflection of pipe and then compared the predicted results with the experimental results.

Abstract: In case of underground construction affected by groundwater, CIP (Cast-In-Place Pile) method is generally used to solve the geo-hydraulic problem. However, as this method has poor connectivity between piles, an auxiliary method for cut-off is required in many cases. In this study, a newly-developed cut-off wall (H-CIP) with no auxiliary method, by using surfactant grout (Hi-FA), which improves anti-washout and infiltration ability, is introduced, and the field applicability of H-CIP method is evaluated. CIP and H-CIP piles were installed with same ground conditions, and field and laboratory tests were conducted to verify the performance, respectively. As results, newly-contrived H-CIP method shows higher field performance for cut-off and strength than conventional CIP method.

Abstract: This paper presents a new vacuum preloading technology in which hydraulic fill is used for sealing while the sand cushion is not necessary. Thus this technology is applicable for projects with scarcity of sand resources.This paper dedicates the characteristics of this technology, reinforcement mechanism, applicable scope, construction technique, reinforcing effect and prospects, in an effort to provide guidance and promote the application of this technology.

Abstract: This is a report on the performance of 4 types of cool roof system through field tests. Cool roof means solar protection on roof surface [1]. The tested systems were solar cells as a shading device, several types of thermal insulation paint as heat reflectors, a rooftop garden as an outside thermal insulator on a roof and a water pond on a roof as a coolant with sensible heat and evaporation. The test results indicated obvious temperature difference between the cool roof and the ordinary surface. The heat flux was calculated from the results to estimate the cooling load saving. Finally, these results were examined from the viewpoint of cost performance.

Abstract: In-Situ combustion is an important transformation mode for heavy oil development, and the key to its success is ignition in the reservoir, On the basis of investigation and research into some related techniques both at home and abroad, this paper presents the development of mobile electric igniter, technical string, down-hole monitoring system, putting-in and putting-out device; the integral outside diameter of the igniter is φ25.4mm; this paper forms the technique of mobile electric ignition for fire flood in vertical hole and introduces the technical principle. The field test results show that the maximum outlet air temperature of the igniter is 527°C when the steam injection rate is 6500Nm³/d; And that realizes high temperature igniting of mobile electric igniter for the first time. This technique will effectively reduce the operation cost of fire flood, and provides technical reserve for separate zone ignition in thick mass oil pool of Liaohe Oilfield.

Abstract: The finite-element software ANSYS/LS-DYNA was used to study the influence of various parameters of barrier hole on the vibration-decreasing effect, such as the diameter, spacing, depth, hole number and row number of barrier holes and distance from blast holes to barrier holes. The simulation study indicates that: vibration-enhancing area and vibration-decreasing area exist together behind the barrier holes; various parameters of barrier holes can apparently affect the location, range and results of the vibration-enhancing area and the vibration-decreasing area; With bigger diameter, shorter distance, larger number and deeper barrier holes, the better vibration-decreasing results will come out; Under the conditions of numerical simulation in this paper, the effect of double-row barrier holes are better than that of single-row barrier holes, and the effect of vibration-decreasing of triangle layout form is almost the same as rectangle layout form of barrier holes; the changing distance between vibration barrier holes and blast holes will have a fluctuating effect on the vibration-decreasing effect, thus we should select the best location of vibration barrier holes based on the actual engineering conditions in practical engineering. The largest vibration-decreasing ratio of the barrier holes we have obtained at the test site is 33.3%, which is successfully utilized in the production explosion, so we have verified effectiveness of vibration-decreasing effect of the barrier holes.

Abstract: Salt expansion was the main diseases of the salty foundation. In order to study the deformation regularity and quantitative description of coarse particles saline soil ground in natural condition, a field test was conducted in Dunhuang area. The exploratory well with 7.5 m depth (deeper then annual temperature change layer) was excavated on site, and the data of salt content \water content \ground temperature \salt expansion rate were collected. From the test it was found that : salt expansion mainly decided by salt content, salt content and salt expansion rate have approximately a quadratic function relationship; the minimum salt content could cause soil expansion is 1.5‰; The salt expansion force was strong, and the gravitational stress could not suppress the deformation.