دانلود رایگان مقاله لاتین تحلیل کارکرد TBM در سنگ آذرآواری از سایت الزویر
عنوان فارسی مقاله:
تجزیه و تحلیل عملکرد TBM در سنگ های آذرآواری: یک نمونه از تاریخچه تونل انتقال آب کرج
عنوان انگلیسی مقاله:
TBM Performance Analysis in Pyroclastic Rocks: A Case History of Karaj Water Conveyance Tunnel
سال انتشار : 2010
بخشی از مقاله انگلیسی:
The site preparation started in 2004 and the TBM arrived at the site in May 2006. TBM assembly was accomplished in 15 weeks and mining commenced in August 2006. At the date of preparing this paper (January 2008), some 8,700 m of tunnel was completed. The double shield TBM procured for this project was manufactured by Herrenknecht. The cutterhead (Fig. 4) is laced with 31, each 17 inch or 432 mm diameter disc cutters with a load capacity of 250 kN. Other main technical data for the TBM are summarized in Table 3. The weekly average performance parameters are shown in Fig. 5. As shown in graph (a) of Fig. 5 about 8.7 km of tunnel was completed in 74 full working weeks or about 500 working days at an average rate of about 115 m/week. Weekly average of penetration rate ranges between 2 and 5.3 m/h with an average of 3.62 m/h (Fig. 5b). Maximum and average weekly utilization factor was 30.3 and 19.1%, respectively (Fig. 5d). Also results of analysis of daily performance of the machine show that maximum TBM advance of 38.9 m/day, rate of penetration of 6.3 m/h and utilization factor of 42% were experienced during this time, however, not all on the same date. Figure 6 shows average time distribution of different activities in the tunnel for the first 8.7 km of tunnel from August 2006 to January 2008. As shown, advance time which includes required times for boring, segment installation and re-gripping comprises 26% of all activities. In the bored section of the tunnel, the main downtime in TBM advance included times required for repairing of different parts of the TBM and back-up system (31%), delays due to adverse geological conditions (14%) and delays related to site management and logistics (13%). Routine maintenance and shift change were also a part of downtime that influenced the TBM utilization and accounted for 16% of total time. Most important adverse geological conditions that have caused delays in the TBM advance include: • Collapse of tunnel face and jamming of the cutter head in crushed zones. • Groundwater inflow and related difficulties for tunneling. • Increasing of cohesive fine grained particles in muck and additional time to clean disc cutters for maintenance. • Increasing disc cutter changes due to mixed face condition in some tunnel sections.
RapidMiner: Data Mining Use Cases and Business Analytics Applications https://books.google.com/books?isbn=1138000809 Markus Hofmann, Ralf Klinkenberg - 2013 - Business & Economics Numerical modeling of the effects of joint orientation on rock fragmentation by TBM cutters. Tunnelling and Underground Space Technology 20(2): 183–191. Hassanpour, J., Rostami, J., Khamechian, M. & Tavakoli, H.R. 2010. TBM performance analysis in pyroclastic rocks: case history of Karaj water conveyance tunnel. TBM Performance Analysis in Pyroclastic Rocks: A Case History of ... connection.ebscohost.com/.../tbm-performance-analysis-pyroclastic-rocks-case-histor... EBSCOhost serves thousands of libraries with premium essays, articles and other content including TBM Performance Analysis in Pyroclastic Rocks: A Case History of Karaj Water Conveyance Tunnel. Get access to over 12 million other articles!