Abstract
The evaluation of axial capacity of jet grouted soil cement columns in soft soil is a complicated issue because it depends according to the number of factors such as, soil type, influence mixture between soil and grouting materials, nozzle jet energy, jet grouting and water flow rate, rotation and lifting speed. These parameters related to the type of jet grouting methods (single, double and triple system). Most methods of design the bearing capacity of the jet-grouting column based on experience. Therefore, some designer calculates the bearing capacity of the jet grouting column based on jet grout section capacity. In this paper, different theoretical methods have been used to estimate of the jet grouting soil-cement capacity, such as Poulos and Davis, 1980 methods and then their comparison with the pile load test calculations based on the quick pile load test as presented in ASTM-D1143-07. Therefore, the study describes a prototype test single and group jet grout soil-cement models of arrangement (1*1, 1*2 and 2*2) for total length to diameter ratios (L/D) is 13.33 and clear spacing three times of diameter has been constructed in soft clayey soils in the right bank of the Euphrates River, at Al- Nasiriyah city. As a result, the theoretical method for estimation the bearing capacity gives unfaithful values for the single and group jet grout column compared to the load- settlement calculations obtained from field pile load test data. On the other hand, the Hansen’s 90% and Butler and Hoy’s given closer results to each other and may be considered faithful interpretation methods to compute the bearing capacity of single and group jet grouting columns.
Highlights
Jet under high pressure is widely used in the industry, while in constructions of civil engineering are most significantly, to cut soil structures in-situ the high velocity of jetting material are used for ground improvement [1]
The study describes a prototype test single and group jet grout soil-cement models of arrangement (1× 1, 1×2 and 2×2) for total length to diameter ratios (L/D) is 13.33 and clear spacing three times of diameter has been constructed in soft clayey soils in the right bank of the Euphrates River, at AlNasiriyah city
The theoretical method for estimation the bearing capacity gives unfaithful values for the single and group jet grout column compared to the load- settlement calculations obtained from field pile load test data
Summary
Jet under high pressure is widely used in the industry, while in constructions of civil engineering are most significantly, to cut soil structures in-situ the high velocity of jetting material are used for ground improvement [1]. Ground improvement by Jet grouting technology can be used in varied and difficult geological and geotechnical situations, showing its practical and economic advantages, in addition to the importance of the performance control on site, before and during the construction of the final foundations [2]. According to the interaction between the jet grout column installations of soil-cement reinforcing elements considerably increase the serviceability of the foundation by means of increasing its strain characteristics and active protection of soils from the influence of the seismic vibrations, providing for the safe operation of the sports structure [11]. Jet grouting columns allow for transmitting substantial loads through the reinforced soft soils and reduce the construction's settlement [13, 14]. The main factors that effect on jet grouting columns geometry are soil characteristic and technical parameters of the jet grouting system such as injection pressure, dimension of nozzles and rotation speed during injection [15]
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