PENYELIDIKAN STRUKTUR DAN KARAKTERISTIK TANAH UNTUK DESAIN PONDASI
IRADIATOR GAMMA KAPASITAS 2 MCi. Penyelidikan tanah telah dilakukan sebelum pekerjaan
disain struktur pondasi gedung iradiator. Pengambilan sample ditetapkan di beberapa titik bor di site
fasilitas Iradiator pada lapisan tanah terganggu maupun tidak terganggu. Dari hasil penyelidikan
tanah ini akan dipilih alternatif / jenis, kedalaman serta dimensi pondasi yang paling ekonomis tetapi
masih aman. Metode penyelidikan tanah yang digunakan adalah Deep Boring, Undisturbed dan
Disturbed Sampling, SPT (Standar Penetration Test), CPT (Cone Penetration
Test/Sondir). Pengetesan dilakukan di lapangan dan di laboratorium mekanika tanah untuk
mengetahui sifat mekanik, ketebalan lapisan tanah dan sifat-sifat fisis lainnya guna perhitungan daya
dukung pondasi. Hasil penyelidikan tanah di tiga titik bor didapatkan hasil rata-rata kedalaman tanah
keras -19,33 m dan daya lekat 3163,88 kg/cm?. Uji boring pada salah satu titik ditemukan lapisan
tanah keras pada kedalaman 32 m dengan nilai SPT maksimal 16. Maka dari data dapat ditentukan
jenis pondasi yang sesuai adalah bored pile. Dikarenakan pondasi merupakan penopang struktur
atas yang dapat mengakibatkan penurunan/ settlement jika daya dukungnya tidak mampu menahan
beban di atasnya.
INVESTIGATION OF STRUCTURE AND CHARACTERISTICS OF SOIL FOR FOUNDATION
DESIGN OF GAMMA IRRADIATORS CAPACITY 2 MCi. Soil investigation conducted before the
work of irradiator building structural foundation design is initiated. Intake of sample was set at some
point drill at Iradiator facility site to the disturbed soil layer or not disturbed. From the results of this
soil investigation will be selected as alternative / types, the depth and dimensions of the foundation
of the most economical but still safe. Soil investigation method used was Deep Boring, undisturbed
and disturbed sampling, SPT ( Standard Penetration Test ), CPT ( Cone Penetration Test / Sondir ).
Testing conducted in the field and in the laboratory of soil mechanics to determine the mechanical
properties, soil layer thickness and other physical properties for calculation of the bearing capacity
of the foundation. The results of the soil investigation at the three-point drill showed the average
depth of the bedrock -19.33 m and adhesion 3163.88 kg / cm?. Test boring at point BH1 found the
bedrock at a depth of 32 m with a maximum SPT value 16. from the data can be determined the
appropriate type of foundation is bored pile. The foundation is the upper structure support which can
lead to a reduction / settlement if its bearing capacity is not able to withstand the load on it.
