PENINGKATAN DAYA DUKUNG TANAH MENGGUNAKAN METODE GROUTING STUDI KASUS GEDUNG A RUMAH SAKIT ROEMANI, SEMARANG, JAWA TENGAH

Abstract

Damage to the foundation after the building process or when the building was being used frequently occurred in the city of Semarang. Building A Roemani Hospital, Semarang, Central Java is one of several location that have foundation failures after build up and being used. The right method to handle it is increase the carrying capacity of the soil with grouting. Grouting is one of soil improvement method, that was conducted by inject the cement paste into the ground with a certain pressure through the borehole, so that the ground’s strength will increase. This research uses the descriptive method, survey method, and analysis method. The method that used in analysis of increasing the land carrying capacity at Building A Roemani Hospital Semarang is soil mechanic laboratory analysis and calculation of land carrying capacity by field investigation. The field data that being used are conus resistance (qc), correlation coefficient (CLCPC, and pile range (Ap) Based on calculations of land carrying capacity, indicates an increase of conus resistance (qc), and foundation carrying capacity after grouting. The conus resistance (qc) of filling soil before grouting was 5:00 kg/cm2. Eight days after grouting, it increases into 7:00 - 9:00 kg/cm2. The conus resistance (qc) of clayey silt before grouting was 4.73 kg/cm2 and increases into 5:30 - 10.61 kg/cm2. Silty sand had 8.70 kg/cm2 and increases into 13.50 - 31.73 kg/cm2. Whereas based on the distance of conus resistance (qc) before and after grouting, ranging from 2 to 5 kg/cm2 and after grouting at distance 1 meter, 2 meters and 3 meters from the grouting point, increases into 9 - 14 kg/cm2, 8 - 14 kg/cm2 and 7 - 14 kg/cm2. The Qpillar of filling soil before grouting was 0,14 tons and increases into 0,19 – 0,25 tons after 8 days. The Qpull before grouting was 0,82 tons and increases into 1,04 – 1,26 after grouting. The Qpillar of clayey silt before grouting was 0,13 tons and increases into 0,14 – 2,62 tons after grouting, and the Qpull increases from 1,91 tons into 1,97 – 3,19 tons. The Qpillar of silty sand increase from 0,24 tons into 3,33 – 7,84 tons, and its Qpull increases from 2,85 tons into 4,19 – 7,29 tons after grouting. Based on distance, the land carrying capacity increases at depth 6 to 11 meters, at depth 11 meter, Qpillar increases from 12,01tons into 16,92 – 28,96 tons after grouting. The Qpull increases from 10,12 tons into 15,17 – 24,64 tons after grouting, at radius 3 meters.