.... The specific questions that the experiment is in- tended to answer must be clearly identified before carrying out the experiment. One must also attempt to identify known or expected sources of variability in the experimental units since one of the main aims of a designed experiment is to reduce the effect...

... ABSTRACT ABSTRACT: Closure of hydraulic fractures yields the in-situ stresses, net pressure and fracture geometry. A series of laboratory model experiments using sand samples is conducted with the aid of X-ray CT technique. The observation and analysis of CT images provide the visualized...

.... In this way, the protection effect can be investigated with a clearly reduced number of time-consuming field experiments. ACKNOWLEDGEMENTS This study was supported by the Board of the Swiss Federal Institutes of Technology. We thank the landowners of the experimental sites for allowing us to perform...

... been used to conduct rock cutting experiments for 20 years at West Virginia University, and vast experimental data can be used directly to calibrate the numerical model. LS-DYNA 3D was chosen as the simulation tool because of its ability to simulate dynamic processes. Figure 2 shows the cutting drum...

... the micromechanical parameters asso- ciated with the bonds (Holt et al. 2005). We will leave these issues out of this paper, and instead fo- cus on the idealized system of unbonded spheres. 2 EXPERIMENTAL LABORATORY SET-UP 2.1 Glass beads Several experiments have been performed with glass beads of various size...

...-term and data will be collected over a multi-year period. The particle detector associated with this experiment will need to be built at depth underground within a very large cavern. Experimental options currently under consideration call for the excavation of rock spans in excess of 50 m, mined...

... presents a methodology that aims to integrate tridi- mensional data, modeled through resource modeling tools, into a tridimensional geomechanical modeling code. Numerical experiments are then conducted on the created model. The objective of the experiments is to establish the impact of internal fracturing...

... its loading curve. Stress changes were relatively slow during the first half of the experiment. Changes increased significantly during the second half, resulting in the definition of a clear inflection point when the stope reached about 75% of its final height. Mining was stopped when a rock burst...

... of laboratory experiments where radial hydraulic fractures were propagated by injecting aqueous solutions of glycerin or glucose along an epoxy-bonded interface between two Polymethyl Methacrylate (PMMA) blocks. Agreement to within 10 percent is demonstrated between the experimental results for the location...

... parameters of events associated with dewatering, excavation, and various rock mechanics experiments, and estimate source kinematics caused by activity within or near the mine. Given the damage location of the event determined by the array, the rock mass can be back-excavated to find the source damage...

... of the fundamental wave characteristics in grouted rock bolts. Extensive laboratory experiments and numerical simulations were conducted. During experiments, guided waves with specific input frequencies were used to study the characteristics of the rock bolts embedded in concrete. Numerical simulation using finite...

... an appreciation of the hydrogeology, rock mechanics, and the processes related to the ensemble of all of these fields. Many experiments may be combined into larger, coherent research themes, be- nefiting from coordinated and collaborative sam- pling campaigns and experimental effort. Physics experiments require...

... surface movement of the slope so as to verify the numerical analysis results (Fig. 4). The experiment procedure is shown in Table 3; the experiment itself is shown in Figure 5. Experimental equipment consisted of an artificial rainfall device and data collection setups. Water content measurement...

... to incorporate 5D (x, y, z, time and $) visu- alization for use in long-term mine planning. Similar concepts have been re-tailored to the MFR experi- ment to provide 5D animation capability (e.g., x, y, z, time and measured head) to better understand the relationships between the measured experimental data...

... experiments in situ. This paper outlines a hypothesis-driven research plan to examine the coupling between the stress field and fluid conducting fractures, which would be integrated into a broad program of geosciences, geo engineering, and biology. The research program takes advantage both of the historical...

.... Hence, SKB is conducting the Äspö Pillar Stability Experiment (APSE) to: 1) demonstrate our current capability to predict brittle failure (spalling) in a fractured rock mass, 2) demonstrate the effect of backfill (confin- ing pressure) on the brittle failure response, and 3) compare the 2D and 3D...

... ABSTRACT ABSTRACT: The potential development of a deep underground science laboratory offers unusual opportunities for inquiry and experimentation in the geosciences and in geoengineering. The completed facility will extend to ~2000m deep, and be available for multi-decade occupancy...

... of the perforations. Traditionally the penetration depth of shaped charges is tested on cement targets under ambient conditions. In this paper we describe the results of an exhaustive experimental program to evaluate shaped charge penetration in rock under downhole conditions. It was found that penetration depth...