Exploring and Disposal of Geologic Hazard under Toft in Karsts Terrain

摘要

Building operations are always influenced by the abundant groundwater from fissures or water-eroded caves in karsts terrain. A study was conducted to explore and dispose the bedrock fissure and water-eroded cave under the toft of a treatment tank of Zhang Jia Jie Environmental Protection Agency (ZJJEPA) in Hunan, China. The ground penetrating radar (GPR) was investigaed with an antenna of 100 MHz. Some transverse profiles were carried out with GPR in order to better delineate the tendency of the discovered cave. GPR locates the tendency of cave and a bedrock fissure. The results of measurement have been verified by some drillings. Some measures to dispose these geologic hazards (fissure and cave filled with water) were recommended. The water-eroded cave has been filled with approximately 7.6 m{sup}3 of nibbles and 3.0 m{sup}3 of concrete. The bedrock fissure has been injected with about 3.5 m{sup}3 of concrete.