The in situ swelling test in a hole

An In-hole Swelling test Instrument (I SI) has been developed. Its probe consists of a force transmitted machinery, an electrical measuring system, and an anti disintegration and diversion device. Using this instrument, an in-situ swelling test for montmorillonized granite was conducted for a pumped storage station. The results showed that the swelling pressure of the montmorillonized granite is related to the fracture and microfracture intensities and groundwater pressure. Un instrument de test de gonflement é l&s;int é rieur du trou a été re alis é . Sa sonde consiste en un m e canisme de transmission de force, un syst e me de mesure e lectrique et un appareil d&s;antid e sint é gration et de d e rivation. Grace à cet instrument, les tests de gonflement in situ pour le granite montmorillonis ê e ont été faite à la station de g é n é ratrice de r é servoir de pompage. Les ré eultats montrent que la pression de gonflement du granite montmorillonis é e est relative o l&s;intensit e de fracture, α l&s;intensit e de microfracture et ô la pression des eaux souterraines, peut-etre aussi ΰ la pression de confinement.