... Hydraulic properties and mechanical properties of rock fractures are intimately linked and the accurate understanding of the poromechanical link/behavior is essential for the crustal energy utilizations, such as geothermal and hydrocarbon. In particular, such a relationship under high pressure...

.... The results of the heater test using an intact specimen showed that no clear damage was found on the surface of the circular opening after heating. In contrast, for the heater test using a pre-damaged specimen, it was found that fractures initiated on the surface of the circular opening but no obvious further...

... strength of_the nuclear waste disposal site in Olkiluoto, Western Finland, was researched as a part of Posiva's Spalling Experiment (POSE). The POSE experiment was conducted as an in situ rock mass strength test that revealed the rock mass failure in Olkiluoto being governed by fracture growth...

... Abstract Hydraulic fracturing (HF) behavior of Pocheon granite was investigated through a series of HF tests under 7 different pumping rates varying from 1 mm 3 /s to 100 mm 3 /s considering cleavage dependent anisotropy of granite. Sleeve fracturing tests were also performed to exclude water...

... samples (weathering, alterations, weakness planes, pre-existing incipient fractures) and from the fact that too often the selected samples cannot provide the required or anticipated results. We insist on the adequacy between the technical objectives of a site investigation and the equipment / procedures...

... Abstract Recent laboratory experiments of hydraulic fracturing on granite samples carried out by Korea Institute of Civil Engineering and Building Technology (KICT) indicated that fluid infiltration into rock matrix plays an important role in the breakdown even though the granite has very low...

... Abstract The most important consideration for geothermal energy development in non-hydrothermal scenarios is the use of hydraulic fracturing technology to establish an effective network pathway to conduct fluid from injector(s) to producer(s). The number of interconnected fractures...

... deformation on saw-cut fractures of varying low-order roughness. We report shear-instability-permeability direct shear experiments on Westerly granite in a triaxial pressure cell that concurrently and continuously measures friction and permeability during multiple sequential slide and hold events. We observe...

... Abstract Multi-stage fractured horizontal wells have been widely applied to develop tight oil and gas reservoirs, while there is a long topic about stress shadow effect in multi-fracture propagation geometry induced by horizontal-well stimulation in different fracture distribution patterns...

... Abstract Multistage hydraulic fracturing is commonly applied to enhance gas productivity in unconventional reservoirs. Since the multiple fractures are created and propagated simultaneously or in a sequential manner from perforation clusters, the induced stress interference is a predominant...

... Abstract Too many required pre-existing fractures (over fifteen) by the HTPF method restrict the wide applications under various stress measurement conditions. Considering the shortcomings of HTPF method, a rock mechanics equation to describe the shearing stresses intrinsically present...

... and the gas resources are exploited in a large scale. In the present study, an experiment was conducted to investigate the bubbly flow characteristics in two artificially intersecting fractures, which are manufactured with glasses for visualization. The results show that: the distribution of gas into two...

... ABSTRACT: A set of hydro-fracturing tests were conducted to obtain the geostress in II measuring segment of 2 boreholes ranging in depth from 164.92 to 373.98 mat locations of Gaocun Iron Mine of the Ma'anshan site in the east of China. Results of all hydro-fracturing tests showed that all...

... ABSTRACT: Hydro-fracturing in-situ stress measurements were conducted in the Jijicao rock block of the Beishan area in Gansu Province, China. A total of 40 hydro-fracturing tests and 15 fracture impression tests were performed in three sub-vertical boreholes at depths ranging between 30...

...). structural geology borehole variation rule monitoring point metals & mining stope tunnel MPa stress change Upstream Oil & Gas deep exploitation stope tunnel stability fracture Reservoir Characterization Chinese Journal borehole stressmeter position central south university vertical...

... the accurate judgment of specimen cracking. 1 INTRODUCTION When materials and components are deformed and fractured under stress, or when the inner stress exceeds the yield limit thus enter the irreversible stage of plastic deformation, the strain energy would released in the form of the transient elastic...

... ABSTRACT: In cold region of China western, water in the surface cracks of the fractured rock would congeal caused by the low temperature conditions, and the volume expansion caused by water-ice phase transition would provide the frost heaving force. While during the melting process...

... that the stability of aquifuge is related with the mining height and aquiclude thickness. Based on the study of dynamic fracture of overburden, the aquiclude stability criterion have setup, and the water preserved mining classification have put forward according to the geological conditions of Yushenfu coal field...

... is an indirect damage, especially for jointed slope and high steep rock slope containing faults or fracture zone sand it is mainly caused by seismic waves generated in the blasting (Li et al. 2006). metals & mining strength characteristic structural geology bedding rock slope failure phenomenon...

... argillaceous rocks will be expanding while meeting with water. The fractures of the roadways develop well under high stress and are suitable to filling with grouting. But the poor cementing performance of cement with argillaceous rock as well as a heavy water filtration rate of cement slurry had resulted...