การประยุกต์วิธีการทางธรณีฟิสิกส์สำหรับงานทางด้านวิศวกรรมธรณีเทคนิค

Abstract

Application of geophysics for geotechnical engineering problems in Hat Yai District, This research has applied electrical resistivity tomography (ERT) with ground penetrating radar (GPR) for soft soil problem to study the geological structure and extent of soft soil In the Southern Region Industrial Estate, Phase 2, Chalung Sub-district, Hat Yai District, Songkhla Province, and applied ground penetrating radar (GPR) for road subsidence problem to find the geological structure of subsurface and analyze the causes of road subsidence in the area of Khlong Hae Security Checkpoint and Chonthara Road Khlong Toei Riverside (Kong Khong Market), Hat Yai District, Songkhla Province The results of electrical resistivity tomography can be divided into two groups, the soft soil group having the resistivity of less than 40 ohm-meters and the non-soft soil having the resistivity of more than 40 ohm-m and the result of the ground-penetrating radar can differentiate signals between soft ground and non-soft soil. The results of ground penetrating radar in the study of road subsidence at the Khlong Hae security checkpoint founded small cavities (0.5-1.5 m) in many survey lines and the Chonthara Road Khlong Toei Riverside (Khong Khong Market) founded a relatively large cavity (1-3 m). In both areas, the geological structure of subsurface has been damaged by subsidence in a wide area and deep down to the waste water collection line. The cause of the subsidence of roads is expected to be related to sewage pipes. The applications of both electrical resistivity tomography and ground penetrating radar both are suitable for solving geotechnical engineering problems.