ESTIMATION SOIL LAYERS FOR SOME AREAS IN BENGKULU CITY BASED ON CPT APPROACH

Lindung Zalbuin Mase1 Geby Fathona(1),
(1) Study Program of Civil Engineering, Faculty of Engineering, Universitas Bengkulu, Indonesia

Abstract


This paper presents the study of soil layers estimation by using CPT data approach. There are 3 CPT data in 3 areas in Bengkulu City used in this study, i.e Rawa Makmur, Pematang Gubernur, and Lempuing Sub-District. Rawa Makmur is an area in Bengkulu City that always gets flooding every raining season. Pematang Gubernur was a farming land area in the past, which is interesting to investigate, whereas Lempuing is a coastal area predicted will have serious damages due to earthquake. All collected data is then analyzed and interpreted. The method used in this study is based on Robertson Method, which is very useful in determining the soil layers, especially for predicting the soil type based on qc (cone resitance) and Rf (friction ratio). The result shows that Lempuing is dominated base sand. This result also strengthen the assumption of liquefaction potential on sand layers in Lempuing. For Rawa Makmur, clay layer is found. Based on this result, the attention should be focused on these layers. This issue could be related to the flood in this area and the possibility of soil consolidation. This area is also becoming the growing area now, therefore both coming issue must be concerned. Meanwhile, for Pematang Gubernur, the soil layer is dominated by clay layer as well. Both issues in Rawa Makmur are potential to happen in this area. However, the focus of those is still in term of preliminary, since this area is less important than Rawa Makmur, where the growing economic is started to concentrate there.

Keywords


soil layer; sand; clay; CPT

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