... feature of Rajo Sur is that it is located adjacent to the SW end of the DET subsidence crater, resulting in an important operational interference with the underground mine. The proximity of the pit to this existing crater has led the company to deposit waste material inside the cavity as well...

... Abstract This paper describes the formation of a large cavity in an underground complex at a hydropower plant in the Himalayas. The geometry of the cavity is controlled by the rock joints and foliation that intersected a major steeply dipping shear zone. For stabilization of the cavity, three...

... sector to the highest elevation of the surrounding mountains), thus significantly disturbing the stress fieldat all mining levels. During recent years the mining advances at an ore extraction rate of approximately 120,000 ton/ day, therefore the cavity is constantly changing and it is necessary...

... has formed cavities extending vertically and also laterally of significant size. The excavation methodology, which considered stand-up time and unsupported span using Bieniawski's RMR, is found most suitable in the given circumstances. Keeping in view field conditions are encountered and failure zone...

.... Location of Tunnel Markusbierg near Schengen The rock in the top heading was performing better than in other sections of the tunnel and did not require steel sets or lattice girders. Heave started sometime after excavation of the heading. Heave of several decimeters had occurred. A cavity was left open...

... RADIATION P. Nekoovaght, N. Gharib, F. Hassani THE BEHAVIOR OF HARD ROCKS WHEN EXPOSED BY 2.45 GHZ FREQUENCY OF PLANE WAVE MICROWAVE RADIATION COMPARED TO A MULTI-MODES CAVITY ABSTRACT Novel rock breakage techniques are becoming more viable and attractive to industry. Microwave energy, as a thermal energy...

... and the casing setting. Depending upon the composition of the drilling fluid, chemical reactions on the salt wall may occur, especially in case of water-based fluids in highly soluble salt rocks. In those cases, cavities by dissolution ( washouts ) can be generated and the casing column remains uncovered...

..., the Cavity Monitoring System (CMS) and Surpac software were employed to visualize the 3-D damage. Also, the Discrete Element Method (DEM) was employed to perform simulations of the falling ore to investigate the damage evolution of drawbells under repeated ore impact and obtain the dynamic damage...

..., which are: pitting, drilling and large rock cavity phenomena. 3.1 Pitting Human activities of local residents are simple paths and road bed profiles excavated by them, which provide assistance to our glimpsing into the internal structure of the accumulation body, as shown in Figure 3. What can be seen...

...Harmonising Rock Engineering and the Environment Qian & Zhou (eds) © 2012 Taylor & Francis Group, London, ISBN 978-0-415-80444-8 Post-closure hydromechanical behaviour of a backfilled cavity N. Dufour & H. Wong Université de Lyon, Département Génie Civil et Bâtiment, Ecole Nationale des Travaux...

... of the Negev, Beer-Sheva, Israel ABSTRACT: This paper examines the expected settlement at the ground surface due to circular cavities in layered rock. We begin with two verifications of the Numerical Manifold Method (NMM): 1. the case of an infinite plate with a circular cavity (Kirsch solution). 2. The case...

... excessive fixity, in our view. In this Figure, r has been limited to a maximum of 0.4 MPa. 5 SUPPORT IN MATERIALS WITH HOLES AND/OR SOFT ZONES NEARBY A problem that requires attention is that of the piles excavated in chalk gypsum and limestone with possible cavities. In both cases they are hard materials...

... and Engineering, Tsinghua University, Beijing, China ABSTRACT: The visualized model test of gas storage cavities destruction process in salt rock is more difficult than the ordinary geo-mechanical model test, which demands the air tightness of cavities, the visibility of destruction process and the similarity...

... & mining exposure time Norite reduction cavity strength specimen basalt 2 power level mineral strength value Upstream Oil & Gas Microwave Radiation application granite tensile strength Harmonising Rock Engineering and the Environment Qian & Zhou (eds) © 2012 Taylor & Francis Group...

... ABSTRACT The limestone as a bedrock located near the surface is corroded by groundwater and its process forms underground cavities. Serious ground stability problems such as ground subsidence and building crack, etc., come to the front in the region where underground cavities are distributed...

... with groundwater. Basic characteristic features of salt deposits and mining methods are presented through the studies already undertaken on French mines. This analysis allows to identify major hazards encountered in different traditional salt mines and solution-mining cavities. In particular, the role...

... fracturing strength Rock mechanics Upstream Oil & Gas Shlyapobersky stimulation fracture propagation equation concentration porosity operation technology roadmap fracture elasto-plastic model cavity deformation 363 Gil, I., and Roegiers, J.-C., Coupled Elasto-Plastic Model for Hydraulic...

... that the development of karst cavity shows a relationship with a structural geological line and it is necessary to define the dominant directions of joint and geological layer (formation). The relationship between the water flow and joint direction can be used as an indicator of cavity presence in their direction...

... zone around the cavity. In this zone (called EDZ for Excavated Damaged Zone) rock can exhibit a dilatancy, which increases the permeability of the rock devoted to host the radwast storage. The extension and the evolution in time of the EDZ is thus of the utmost importance to characterised the sealing...

... by, explosion suggests the existence of areas (zones) distinguished by different structure and mechanical characteristics. The size of the cavity, crushing zone, damage zone, zones of fracturing and block fracturing, as well as the general properties of rocks in these zones are discussed. It is shown...