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THE INFLUENCE OF PHYSICAL PROPERTIES ON THE COMPRESSIVE STRENGTH OF THE ROCK IN THE SAMIGALUH AREA, KULON PROGO, INDONESIA

The Samigaluh area, Kulon Progo, Indonesia, is composed of rocks from the Old Andesite and Jonggrangan Formations, with very different physical properties. The difference in physical properties indeed results in the engineering properties of rocks, for example, in terms of compressive strength. Studying the relationship between physical properties and rock compressive strength in these two different formations is exciting to find out the extent of the relationship between physical properties and rock engineering. A geological engineering survey was carried out simultaneously with the collection of six rock samples representing intrusive andesite, andesite (breccia and lava fragments), and tuff of the Old Andesite Formation (OAF), limestone (reef/calcarenite) Jonggrangan Formation. Furthermore, rock samples were analyzed physically (petrographically) and mechanically (compressive strength) in the laboratory. The results of field surveys and analysis of laboratory data yield knowledge about the relationship between the physical properties of rocks and their compressive strength. The intrusion andesites and OAF andesites generally have a porphyroaphanitic texture, anhedral - subhedral, hypocrystalline, inequigranular crystal form, with a massive structure, and the composition of plagioclase, quartz, and accessory minerals (hornblende). Fine-textured tuff, hypocrystalline, in the form of glass and crystal tuffs. The Jonggrangan limestones are fine to medium textured, well-sorted, grain supported, with variations of wackestone – packstone. The compressive strength of andesite is 39.98 – 49.36 MPa, calcarenite is 43.32 MPa, reef limestone is 20.44 MPa, and tuff is 11.15 MPa. The compressive strength of rock is influenced by texture (grain size/crystal) with a correlation coefficient of 68% (strong correlation). In comparison, rock composition (percentage of quartz) has a very weak correlation (correlation coefficient of 18%).