DETERMINATION OF GEOLOGICAL AND GEOPHYSICAL (ELECTRICAL- VESMETHOD) FEATURES OF THE KARST CAVITY IN THE ESENTEPE REGION OF BATMAN PROVINCE

Abstract

Within the scope of this study; in order to reveal physical features of the ground pit which is considered to be the karst cavity in the Esentepe region of Batman Province, geological and geophysical researches were conducted. Within the framework of the geological studies carried out in the examination area, 4 exploratory drillings in total of 75 meters depth were performed at the locations determined with the purpose of identification of the changes in lateral and vertical directions of the geological and lithological status, the groundwater level and the engineering parameters of the ground pit which is thought to be in the karst cavity structure in Esentepe region. With the intent of detection of the physical features of the ground layers that were passed during borehole drilling, Standard Penetration Test (SPT) was carried out. Moreover, ground’s natural unit bulk density, water content, sieve analysis and Atterberg limits were determined on the disturbed (SPT) andundisturbed (UD) specimens taken from the boreholes, and consolidation & Tri-axial Compression Tests were performed. Geophysical researches conducted in the examination area consist of Vertical Electrical Sounding. As geophysical study; vertical electrical sounding was performed at 2 points. Visible resistivity distance curves & ground electric sections of the Vertical Electrical Soundings and the lithology of the underground structure were evaluated by using Ipı2win program. Furthermore, in the examination area, with the multi-electrode resistivity method, resistivity area data obtained via AGI R8 device capable to measure 8-channel 84-electrode resistivity and IP were evaluated in the Earthimager 2D program which is a computer based evaluation program. Comments were made by correlating the evaluations and the regional geology. Within the scope of the study, mechanism of the pit formations in karst cavity structure causing problems such as subsidence in the structures, construction of which is thought and as ground failure on the grounds on where these structures will be constructed, occurring at the city center of Batman Province was examined

Keywords

• Batman, Karst Cavity, Resistivity, Vertical Electric Sounding,Standart Penetration Test