.... A correlation between the lifespan of the wear parts and the net drilling velocity is developed, allowing for a more reliable performance prediction for bored piles. Introduction In recent years, the number of pile foundations for bridges and pile walls has been ever-increasing, due to economical...

... Abstract Rockfall fragmentation is a very complex phenomenon that is still poorly understood and modelled. Being able to adequately model fragmentation of impacting blocks, including change of shape, size, and energy after breakage, is essential to be able to predict realistic trajectories...

... for brittle rocks (figure 1a). Figure 1b shows the minor principal stresses around a 8 m dia. circular tunnel at approximate 750 m of overburden for different k (= σ H /σ V ). rock type strength prediction francis group geology geological subdiscipline environmental science 833 theory upstream...

... monitoring with those estimated with models commonly used in TBM performance prediction. The aims of this study, still ongoing, are a better comprehension of the MTB operation in terms of efficiency, work of the excavation tools, load distribution, and the evaluation of the adequacy of the most known methods...

..., including mining design optimization, rockburst mechanism and prediction, stability control of surrounding rock, fault stability assessment, exploration and development of coalbed methane, coal and gas outburst prediction, evaluation of water inrush from coal floor, and high-stress rock breaking...

... categories of igneous, metamorphic and sedimentary rocks were used. Imperial equations and prediction models were determined using regression analysis and neural networking, respectively. Finally, using the proposed equation, obtained values were classified along with the different classifications for rock...

... Abstract Anomalies in tunnel ahead cause various problems, such as ground settlement, sinkholes and groundwater inflow during tunneling. Therefore, the accuracy of predictions of the location and size of anomalies is essential for safe tunnel excavation processes. TEPS, known as a tunnel-ahead...

... opinions on the mechanism of different types of rockburst in the specific geological conditions in the Upper Silesian Coal Basin. Geomechanical methods comprising destress drilling, destress blasting and seams watering as well as geophysical methods of rockburst prediction and prevention are presented. All...

.... We have studied the effect of the fault zones on the measured 3D displacements, using the common evaluation and displacement prediction methodologies, and we show the results obtained during the control of the „normality" of the displacements from the underground spaces which were excavated full face...

... Abstract Blasting and the transmission of vibration involve numerous variables which makes it impossible to predict the levels of vibrations. Therefore an effective blast design and optimization require a multitude of variables be integrated into a single instance. In prior research...

...) and igneous rocks (granitoids and dolerite). A back propagation artificial neural network was developed and trained in order to predict UCS. The input parameters were unit weight γ, (Is ( 50 )), (σ t ), and lithology. The lithology was introduced in the neural network as a qualitative input parameter...

... much comparable to a coal mine situation. Taking this factor into consideration, the prediction of subsidence parameters has been carried out by adopting the well accepted and conventional coal mining subsidence prediction methods that have been developed in the country and are suitable for Indian...

... Abstract It is critical to obtain the rock strength along the wellbore to control drilling problems such as pipe sticking, tight hole, collapse and sand production. The purpose of this research is to predict the uniaxial compressive strength based on data of sonic travel time, formation...

... ABSTRACT: The rockburst hazard frequently occurs in the process of constructions with deeply buried rigid rock. It is a difficult problem that how to predict the occurrence and intensity of rockburst. General technologies often can not be competent because of the complex features of rockburst...

... ABSTRACT: With widespread applications of mechanized tunneling in almost all ground conditions, prediction of anticipated performance and production rate of tunnel boring machine (TBM) is essential part of planning, cost estimation, and selection of proper machine specification to achieve...

... the storage integrity of the reservoir. reservoir geomechanics injection pressure Upstream Oil & Gas co 2 Fracture Zone injection well Reservoir Characterization caprock prediction fracture fault zone In Salah fault fracture zone permeability injection uplift pattern uplift surface...

... include a weightless intact rock that could be intercepted by one or two sets of weak planes. In all cases the predictions from other researchers are pre- sented for a comparison and validation of the results by present study. The material properties used in the first set of referenced simulations...

... ABSTRACT: Explorative tunnels are one of the best ways to assess the rock quality in the preliminary stage of a long tunnel excavation project: this strategy allows predictions for evaluating, with good accuracy, methods, costs, and technical problems related to the excavation of the main...

... " prediction of geotechnical behaviour is difficult". However, it seems that there has never been a formal investigation of how the OM satisfies the LSD paradigm. As application of the OM is commonplace in rock engineering, we believe it is critical that this is done. Thus, this paper re-examines the OM...

... softening behavior, with various stress states as determined from the overall 3D analysis. The results allow definite qualitative statements about the influence of the stress state 1 Introduction As the TBM performance prediction is used to make reliable cost and price estimates as well...