For evaluating boreability of a given rock mass, measurement, study, and assessment of the engineering properties of intact rock and related rock mass properties are very important. At the present, tunnel boring machines (TBM) and roadheader are commonly used in rock excavation technology and have witnessed increased area of application in recent years, while new machines are being put into more challanging ground conditions. To study applicability of any of these machines for a project, intact rock properties including uniaxial compressive strength (UCS), tensile strength (BTS), brittleness, abrasiveness, and hardness or related indices are being measured in various laboratory tests. Equally important are the rock mass properties such as number and frequency of joints, fractures, foliations, as well as rock fracture properties, homogeneity, orientation of joints. This information is in turn used along with TBM specifications to study the feasibility of mechanical tunneling to complete the project on time and at reasonable cost. Various prognosis or machine performance prediction models have been used by researchers and the industry around the world for predicting TBM performance in a given ground condition. Colorado School of Mines (CSM) and NTNU (Norvegian Institute of Technology) performance models are the best known and most frequently used models for performance prediction or analysis. In this paper, rock properties that are utilized as input parameters in both the CSM and NTNU models were evaluated. A comparison of the two models and related laboratory rock tests suggested for TBM performance prediction for each model and their impact on the output was discussed.
|Original language||Multiple languages|
|Title of host publication||IX. Regional Rock Mechanics Symposium, 30-31 October, 2008, DEU, İzmir Turkey|
|Editors||N. Turk et al|
|Number of pages||20|
|Publication status||Published - 2008|