Pile Design

In stiff, overconsolidated clays, cyclic lateral loads may open a gap (slot) between the pile and soil. The slot may gradually grow wider and deeper because of erosion of soil caused by the squeezing of water out of the gap. This erosion, in addition to the seafloor surface erosion and scour, may significantly affect the pile design computations. 

Pile Design, The layout of a pile of this type would still be very similar to the ones described above, particularly to the second one. The amount of D2O for the smallest plant is not much greater than for the light water system. The 49 production per ton of D2O is, however, somewhat lower. In order to take out even this much heat, it is necessary to use the He mder 10 atm pressure the cross section for the flow of the coolant is made larger and the operating temperature is raised. Consequently, a pressure tank is needed aroimd the pile and thermal insulation must be provided between the He and the D2O. 

Pile Design, The general layout of the pile proper is very similar to the He cooling system. Bismuth is used instead of He and is circulated through a heat exchanger as well as through the pile. 

For pile foundations such as bored piles, design parameters studies such as conducted by Tan et al. (1998) is available. Design curve relating shaft resistance factor with SPT N value is reproduced in Figure 3.11. Pile base resistance from their studies is negligible and is recommended not be considered. 

Geo Publication No. 1/96. 1996. Pile design and construction. Hong Kong. 

Tomlinson, M.J. 1977. Pile design and construction practice. Viewpoint Publication. 

Superstructure loading will have an effect on the pile design when the imposed vertical and horizontal loads are large relative to the load solicited by lateral soil pressure on the piles. 

PILE DESIGN FOR LATERAL SOIL MOVEMENT Criteria... 

Certain possibilities of optimization of pile design exist before detail design is carried out. These are briefly discussed here. 

Based on design information gathered above, pile design as an isolated pile would be carried out. The aim is to choose suitable pile type, pile section and pile length. 

Factor of safety (FOS) consideration for both structural and geotechnical capacities is generally taken as two, as the rninimum. Such recommendations can be found in the standards for pile design and also in the design of anchors where micropiles are also associated with. 

To determine ultimate bearing capacity of the soil. This can also be used to check calculation of the pile design. 

Apart from satisfying the required factor of safety for pile capacity, acceptance of a working pile is also based on the specified settlement performance of the pile. These acceptance criteria may vary depending on the requirements of the specific project. In general, the satisfaction of these acceptance criteria would indicate an acceptable and adequate pile design, adopted method of pile installation and quality of construction. 

AS 2159 1995. Piling Design and installation. Standard Association of Australia. 

In pile design, puny thinking of the load, improper parameters selection, unreasonable material selection and layout design all these could lead to pile broken, as shown in Table 8, unreasonable design accounted for largest pile broken and the ratio reached 37%. 

While the Met Lab labored to make headway on pile design, Seaborg and his coworkers tried to gain enough information about transuranium chemistry to insure that plutonium produced could be successfully extracted from the irradiated uranium. 

Matthias received his assignmoit in late March. The three water-cooled piles, designated by the letters B, D, and F, would be built about six miles apart on the south bank of the Columbia River. 

Production pile designs are developed at the Metallur cal Laboratory in Chicago. 

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