جستجوی مقالات مرتبط با کلیدواژه "سد رودبار لرستان" در نشریات گروه "مهندسی معدن"

In this paper, DFN-DEM simulation using PFC3D software to evaluate the effect of joint intensity variation on tunnel support systems performance has been performed. Three dimensional distinct element software of PFC3D is considered for numerical modeling in this paper. This software has many advantages such as ability to create three-dimensional distinct joints with limited size and with different statistical characteristics, flexibility in different conditions and ability to monitoring a momentaril caving and falling during tunnel stability analysis. In this paper, at the first stage, by using of discrete fracture network (DFN) modeling and based on the surveyed data from access tunnel to the gallery of Rudbar Lorestan dam, fractures in this region have been simulated in the software and then is linked to the intact rock model. Finally, the performance of tunnel support systems of shotcrete and steel frame relative to change of the rock mass fracture intensity is investigated. The obtained results indicate more resistance of steel frame against fracture intensity variation compare with the shotcrete support system. Serious damage to shotcrete support system occurs by doubling the number of joints, while about the steel frame, serious damage occurs with four times the number of joints. Therefore, by increasing joint intensity which is caused by various factors such as explosions, earthquakes and etc, the steel frame support system has higher reliability.

Accurate determination of geotechnical and geological parameters of rock mass was performed using geotechnical exploration results including, the laboratory and in situ tests, empirical relations, geological surveys and field observations. The rock masses along penstock tunnels of Rudbar-Lorestan have a complex geology and consist of Dalan, Hormoz and Mila formations, mostly composed of shale, marl, marly limestone to limestone and dolomite. In this study, based on the measured data, the rock masses along penstock tunnels were classified by engineering classification systems of RMR, Q and GIS. And, a new relationship between RMR and Q for the studied area was presented. There were various empirical relations between RMR, Q and GIS, that were used for estimating geotechnical parameters. It must be noted that each of the empirical relations found may produce proper results for special regions. In this paper, the deformation modulus, cohesion and friction angle of Dalan formation were evaluated using the results of in situ dilatometer tests, laboratory tests, and findings of more than 25 geotechnical exploration boreholes in Dalan formation. Afterwards, by calibrating the empirical equations through the measured data, the geotechnical parameters of Mila and Hormuz formations were accurately estimated.