Linear flow behaviour of matched joints – case study on standard JRC profiles     

Mahdi Zoorabadi  Serkan Saydam  Wendy Timms  Bruce Hebblewhite 《Geomechanics and Geoengineering》2016,11(3):189-200

Roughness on rock joints produces a variable aperture across the joints and increases the flow path length. These conditions should be taken into account for a good approximation from cubic law. In this paper, the concept of local true aperture and tortuosity is applied to assumed joints where surfaces are matched to each other and correspond with standard Joint Roughness Coefficient (JRC) profiles. Furthermore, the hydraulic behaviour of JRC profiles is studied by a new laboratory experiment setup. The analytical approach provides new insights into the effects of roughness on hydraulic properties of rock joints. The results indicate that for a constant mechanical aperture, both the minimum local aperture and hydraulic aperture decrease with increasing JRC. Furthermore, tortuosity and standard deviation of local true aperture increase with JRC increment. The trend obtained between different parameters and JRC shows an obvious fluctuation for JRC lower than 10. On one hand, the results of this study along with a critical review of previous studies demonstrate that JRC profiles cannot present a precise roughness increment when JRC is less than 10. A new laboratory setup was designed to study the flow behaviour of JRC profiles. The results obtained from laboratory experiments under linear flow conditions validate the accuracy of the applied analytical method.  相似文献   

Parameter Study on Prediction Methods for TBM Penetration Rate     

Mahdi Zoorabadi  Serkan Saydam  Bruce Hebblewhite 《Geotechnical and Geological Engineering》2013,31(2):783-791

Penetration rate prediction of Tunnel Boring Machine (TBM) is the first step to advance prediction process of mechanized tunnelling. In this research, influence of effective parameters on TBM penetration rate is investigated by sensitivity analysis of three main TBM performance prediction methods; Norwegian University of Science and Technology (NTNU), rock mass index (RMi) and Q_TBM. Based on these analyses, it is shown that applied thrust per disc and joint spacing in NTNU and RMi models have more influence on penetration rate. In Q_TBM model, Q value, applied thrust per disc and induced biaxial stress are more effective.  相似文献   

Analytical methods to estimate the hydraulic conductivity of jointed rocks     

Zoorabadi  Mahdi  Saydam  Serkan  Timms  Wendy  Hebblewhite  Bruce 《Hydrogeology Journal》2022,30(1):111-119

Hydrogeology Journal - The hydraulic conductivity of jointed rocks is one of the main input parameters to predict water inflow to engineering structures that are located in the jointed rocks....  相似文献