S tevin Laboratory Department Engineering, Technology, Delft, Netherlands of fluid saturated materials is ._ ............. '"'_, .......... ,..., ...... pressure, which reduces the effect material. Nevertheless, the excluded. tensile to be investigated. Hydraulic fracturing concrete and rock is the fracturing…
S tevin Laboratory Department Engineering, Technology, Delft, Netherlands of fluid saturated materials is ._ ............. '"'_, .......... ,..., ...... pressure, which reduces the effect material. Nevertheless, the excluded. tensile to be investigated. Hydraulic fracturing concrete and rock is the fracturing of material under a The fluid pressure can be imposed externally (e.g. water pressure on a dam) or internally (i.e. pore fluid pressure). A tensile ............. ~ .... ..., ...... hydraulically when the net fluid pressure exceeds the material. Once a fracture is initiated, the fracture either by communication of the fracture with the or by pore fluid drainage from the material. The pressurized impose an extra body force on the fracture faces driving force for fracture propagation. When the state of stress will be changed by fluid in the material), thereby influencing the hydraulic hydraulic fracture problem is thus a highly coupled fluid, fracture fluid and solid material. At coupling mechanisms are barely understood . ...., ... ,. .. J ............. ...., the coupling effects in fluid saturated materials, experiments in tension have been carried out with a triaxial cell. paper, the experimental set-up will be described briefly. Results shown, with respect to the fracture initiation stresses. Interpretation the results will focus on the failure mechanisms at 2 Experiments Experimental ~ ........ ,., ..............