ABSTRACT: Non destructive testing on piles can be divided into two main categories. The first category is to find out the integrity of the piles, such as Pile Integrity Testing (PIT) and Sonic Logging. The second category is to find out the pile capacity, such as Dynamic Load Testing / Pile Driving Analysis. Since the early 1990s, the application of the above tests has been brought into practice and has been gaining its popularity in Indonesia. However, the basic theory behind the testing has not been widely disseminated. This paper tries to elaborate the first category of the testing, i.e. the Pile Integrity Testing and Sonic Logging. The basic theory, the advantages and disadvantages, the application, the limitation and the interpretation of those techniques shall be discussed.

full paper: Teknik Uji Non Destruktif untuk Mendeteksi Integritas Pondasi Tiang

ABSTRACT: It has been known that a group pile lateral capacity is smaller than the sum of each pile capacity composing the group. A reduction factor, also known as efficiency factor, is required to determine the effective lateral capacity of group piles. To the authors knowledge, in most geotechnical text books, only the spacing of piles is considered in evaluating the pile group lateral capacity. No consideration on the effects of soil stiffness modulus and the total number of piles forming the group are taken into account. The availability of a geotechnical 3D finite element software, namely Plaxis 3D foundation, made it possible to evaluate those factors. It is found that the bigger the number of piles in a group the lower the efficiency factor, the higher the soil stiffness modulus the greater the efficiency.

full paper: 091104-Laterally Loaded Pile with Plaxis 3D-PIT13-Bali