Fl studio 4.1 crack free download utorrent. PILE JACKING IN SAND AND SILT Andrew Jackson () Cambridge University Engineering Department 13 February 2008 Abstract Pile jacking (also known as ‘press-in piling’) is an innovative technique for the installation of preformed piles, in which hydraulic rams are used to push the piles into the ground. Machines have been developed to allow this technique to be used quickly and efficiently. Advantages over traditional techniques such as dynamic pile driving include greatly reduced noise and vibration during installation.

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The use of pile jacking presents new challenges for the geotechnical engineer. Designers of jacked piles for any loading must predict the short-term axial force that will resist pile installation, so that a piling machine with a sufficiently high capacity to overcome this resistance can be selected. If unexpectedly high resistance is encountered, the piler may be unable to advance the piles to the required embedment.

In many cases this installation resistance may be different from the long-term ultimate capacity which the pile can mobilise to resist applied axial loads. This paper describes a field investigation into the force required to jack piles into sand and silt.

A series of field tests involving installing a 15m-long closed-ended tubular steel pile at a site in Japan is reported. During each test the total installation resistance was recorded and sensors in the pile measured the forces on the base and shaft. These resistances were found to be consistently less than standard predictions of the medium-term ultimate axial capacity from CPT (cone penetration test) data. This difference appears to be caused by rate-dependent partially-drained installation behaviour. Excess pore water pressure generated during installation reduces the installation resistance, making it lower than the drained medium-term capacity. The significance of this behaviour for designers of jacked piles is discussed, and techniques for predicting it are investigated.

The Jacked Piling Method The expansion of urban construction onto increasingly marginal sites is making the use of piled foundations an ever more attractive option for designers. One common form of piling, which can offer a higher ultimate capacity and stiffness than bored piling, is driven piling. However, pile driving produces levels of noise and ground-borne vibration which are unacceptable for many urban sites. A relatively new piling technique which offers the benefits of driven piling with additional advantages including reduced noise and vibration is jacked (or ‘press-in’) piling.

In this method, a static jacking force is applied to a preformed pile to push it into the ground. The ‘Silent Piler’ type of pile jacking machine (Figure 1 overleaf) is capable of ‘self-walking’ along an advancing wall of piles, and gains reaction from previously-installed piles. The machine can be controlled by a single operator, with fresh piles being delivered by a single crane. Although developed in Japan, the technology has been used throughout the world (1), including on the Grand Arcade project in Cambridge (2). Pile Jacking in Sand and Silt. Previous research (3) has identified many advantages of jacked piling over traditional techniques, including:      very low levels of noise and vibration; enhanced capacity due to the low number of stress cycles experienced by the soil around the pile during installation; enhanced stiffness due to the full pre-loading experienced by the soil around the pile during installation; the potential for extraction and reuse of temporary piles, bringing cost savings and environmental benefits; and the ability to use the measured installation resistance as an indicator of the pile capacity.

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