Analysis of Soil Investigation Using Cone Penetration Test (CPT) in The Construction Building of The Madrasah Aliyah Negeri Surabaya

Abstract

In a construction project, soil investigation is crucial. Soil investigation is the initial step in a project activity related to planning substructures or underground structures. This activity is expected to provide information about soil conditions, soil types, groundwater levels, soil structure layers, and soil properties for foundation planning. The problem formulation related to soil investigation in the construction project of the Madrasah Aliyah Negeri building in Surabaya City is to review the characteristics of soil layers, the total friction value based on Cone Penetration Test (CPT), and recommendations for bearing capacity and depth of pile foundations.

The research uses a quantitative method with direct data collection in the field through manometer readings on CPT/sondir at three sample points. The results obtained indicate that the soil characteristics at the research location are layers of Peat/Clay/Silt/Silty Clay/Silty Sand/Sand. The CPT test results at a depth of 8.6 - 9.6 meters have varying total friction values, namely S-01 = 435.60 kg/cm, S-02 = 365.40 kg/cm, S-03 = 372.60 kg/cm. As for the recommendation for pile depth = 9.6 m and the largest pile bearing capacity is found in pile size with Ø 50, with pile allowable compression capacity at each point being S-01 = 114,704 tons; S-02 = 110,897 tons; S-03 = 111,457 tons and pile allowable tension capacity at each point being S-01 = 39,562 tons; S-02 = 35,613 tons; S-03 = 35,805 tons.