Pekerjaan Penyelidikan Tanah Dengan Metode Boring di Proyek Jorr Elevated Ruas Cikunir - Ulujami

Abstract

Soil Investigation Work Using the Boring Method in the Jorr Elevated Project for the Cikunir - Ulujami Section. Planning a foundation structure must be done based on valid and detailed data to be measurable and avoid overcalculation. One of the stages prior to planning the foundation for the JORR Elevated Cikunir - Ulujami Section Project is conducting a soil investigation using the Deep Boring and Standard Penetration Test Methods to determine the condition of the soil layer, the depth of the hard soil and the elevation of the groundwater level. Soil investigations were carried out at 30 different points by drilling and taking soil in each layer to a depth of 30 meters to 40 meters. In addition, a Standard Penetration Test was carried out to determine the soil resistance test by dropping a hammer weighing 63,5 kg into the SPT tube every 2- meter interval and recorded each number of its strokes. From the results of the research conducted, the results were obtained that the soil layer around the JORR Elevated Cikunir - Ulujami Section Project is dominated by silt, loamy and solid sand soils and the average hard soil depth is at a depth of 22 meters.

Keywords: soil investigation, standard penetration test, foundation, soil layers, hard soil

Abstrak

Perencanan suatu struktur pondasi harus dilakukan berdasarkan data yang valid dan rinci agar dapat terukur dan menghindari kelebihan perhitungan. Salah satu tahapan sebelum dilakukan perencanaan pondasi di Proyek JORR Elevated Ruas Cikunir-Ulujami adalah dilakukannya penyelidikan tanah dengan metode Deep Boring dan Standard Penetration Test untuk mengetahui kondisi lapisan tanah, kedalaman tanah keras dan elevasi muka air tanah. Penyelidikan tanah dilakukan di 30 titik berbeda dengan cara mengebor dan mengambil tanah di setiap lapisannya hingga kedalaman 30 meter hingga 40 meter, selain itu dilakukan Standard Penetration Test untuk mengetahui uji ketahanan tanah dengan cara menjatuhkan hammer dengan berat 63,5 kg ke tabung SPT setiap interval 2 meter dan mencatat setiap jumlah pukulannya. Hasil penelitian diperoleh hasil bahwa lapisan tanah di sekitar Proyek JORR Elevated Ruas Cikunir-Ulujami didominasi oleh tanah lanau, tanah lempung dan pasir padat dan kedalaman tanah keras rata-rata berada di kedalaman 22 meter.