A NEW IN SITU TEST FOR DETERMINATION OF ROCK-FRACTURE HYDROMECHANICAL PROPERTIES: THE HYDROMECHANICAL PULSE INJECTION TEST (HMPIT)
A new in situ test, called the Hydromechanical Pulse Injection Test (HMPIT), is proposed for determination of rock-fracture hydromechanical properties. Compared to a conventional hydraulic pulse test, which typically uses only the pulse-pressure decrease stage, the HMPIT provides interpretable high-frequency data of both the pulse-pressure increase and decrease stages. Moreover, the HMPIT provides simultaneous high-frequency data of both pressure and fracture-mechanical displacement simultaneously, and can therefore be used to assess both hydraulic permeability and normal stiffness of fractures in rock. The paper describes the specialized field test equipment for HMPIT (with fiber-optic sensors), its application in measuring the in situ hydromechanical behavior of a major shear fracture, and evaluation of field data gathered in a HMPIT by series of coupled hydromechanical numerical analyses, using both distinct-element and finite-element modeling techniques, which yield new insights to fractured rock hydromechanical behaviour.
F.Cappa Y.Guglielmi J.Rutqvist C-F.Tsang A.Thoraval
Geosciences Azur, CNRS-UNSA-IRD-UPMC, Sophia Antipolis, France Lawrence Berkeley National Laboratory Geosciences Azur, CNRS-UNSA-IRD-UPMC, Sophia Antipolis, France Lawrence Berkeley National Laboratory, Earth Sciences Division, Berkeley, USA INERIS, Ecole Nationale Supérieure des Mines de Nancy, Nancy, France
国际会议
南京
英文
103-108
2006-05-22（万方平台首次上网日期，不代表论文的发表时间）