ANALISIS KUAT TEKAN BATUAN TUFA DENGAN MENGGUNAKAN PENGUJIAN POINT POINT LOAD INDEX

(Studi kasus : Longsoran Lereng Jl Jamin Ginting Km 29 Desa Sibolangit )

Abstract

This research is an activity to determine one of the mechanical properties, namely rock strength (σc). Point Load Index is an index test carried out to predict the UCS value of a rock indirectly in the field. In the experimental research that will be carried out in the laboratory which aims to analyze the uniaxial compressive strength of tuff rock with a point load test with a block-shaped and irregular sample (Irregular). the results of the analysis of the compressive strength of tuff rock on the slope components of the landslide in Sibolangit Village which were tested in the laboratory with the Indonesian National Standard (SNI 2814: 1992) and also analyzed with (ISRM 1985). The uniaxial compressive strength value based on the Point load Index test of the beam sample with the SNI 2814: 1992 equation analysis is 19.46 Mpa while based on the ISRM: 1985 equation analysis is a minimum of 17.53 MPa and a maximum of 21.91 MPa. The uniaxial compressive strength value based on the Point load Index test of the irregular sample with the SNI 2814: 1992 equation analysis is 11.36 Mpa while based on the ISRM: 1985 equation analysis is a minimum of 10.33 MPa and a maximum of 12.83 MPa. From the point load index test that has been carried out, it can be concluded that the factors that affect the test result value are the test loading speed and the size of the rock sample being tested. Where if the loading speed is increased, the test value will increase and from the sample size it shows that a smaller sample size will produce a larger value.