KNOWLEDGE BANK

 LASER DIFFRACTION SYSTEM Vs HYDROMETER FOR GRAIN SIZE ANALYSIS This Article was aimed to validate the usage of the LDS method as a reliable replacement of the hydrometer method for grain size analysis of fine-grained geo materials. The findings of this study indicated that the LDS method could be a standalone technique for particle size analysis of fine geo materials and can reproduce the hydrometer results with appreciable precision. Using the Microtrac S3500 LDS instrument with samples prepared at a concentration of 1.4 g/l in a distilled water solution, a default refractive index value of 1.75, and without the addition of a dispersing agent or sonication, the results were proven to be satisfactory. Based on the liquid limit of the samples, a mathematical model was provided to select the distribution method (either volume or number) to yield the closest results in comparison to the hydrometer method. Based on the provided equation; any sample with LL >= 180% will result in th...

  MAHA METRO MACHINARY COLLAPSED Place of the Incident : Maha Metro, Pune Metro Project  Date of the incident: Jan 2019 No Fatal Reports The incident took place as the machine operator could not gauge the sogginess of the soil that caved in. This happened during underground utility checking by the 30 foot piling rig.  which narrowly misses two key flyovers in the area. The site team missed to place the machine on firm ground, which caved during lifting heavy loads. In case of Accidents in working place a fire engine is mandatory to rescue them. But the officials did not ensure the presence of a fire engines. Negligence  is the main reason for the incident. How to avoid this kind of Incidents? There are a range of risks associated with crane operation; Crane pads made of fabricated steel are adopted to distribute the high loading pressure of the crawler crane. The interaction between the crane pad and soil is complicated, and depends on the pad stiffness and...

  Britain’s  Trains powered by human waste and discarded food could be introduced to its network under plans to phase out dirty diesel engines. The 'Bio Ultra' railcar is the brainchild of a team of engineers led by the Worcester-based Ultra Light Rail Partners and will be able to carry up to 120 passengers. With a top speed of 50 mph, the 66 feet (20m) long car will turn biomethane gas into electrical power which will charge the train's batteries and drive its motors. The development is being support by a £60,000 grant from Innovate UK, the Government's non-departmental research-funding agency. This is the second such grant that the team have been awarded. The previous, for £350,000, was used to build a smaller, 60-person railcar earlier this year. This demo 'mini train' which was around 33 feet (10m) long and weighed some 12 tonnes was put through its paces at Motorail’s Long Marston test facility in July 2020. In the wake of COVID-19, however, the new...

  Driverless Train of Delhi Metro's Magenta Line crashes into wall Incident date: Dec 2017 Location:  Delhi Metro's Magenta line, Kalindi Kunj Metro Station. Fatality  : No Driverless train of Delhi Metro's Magenta line crashed into a wall of Kalindi Kunj metro station. The Kalkaji -Botanical Garden metro line,  the incident happened within the gated boundary of the station.  Delhi Metro's new generation trains that can be maneuvered without drivers are going to run on this route. Movement of these driverless trains would be facilitated by advanced Communication Based Train Control (CBTC) signaling technology. Initially it is planned to operated by drivers for the initial couple of years. 12.64 km Magenta line was given the necessary safety approvals by Commissioner for Metro Rail Safety (CMRS). A trial train was moved from the workshop without testing the brake system as a result of which, while the train was moving up the ramp for washing, it ro...

WHALE CATCHES DUTCH METRO TRAIN AFTER DEADLY CRASH  Date of the Incident:  2 November 2020 Place :  De Akkers station in Spijkenisse, Netherlands Metro train in Spijkenisse, near the city of Rotterdam, Netherlands crashed through a barrier at the end of the tracks. Instead of plummeting into the water below, the train was caught by a sculpture of a whale's tail.  Several meters above the ground, the train was left perched upon one of two tail fins. The sculpture was built around 20 years ago in a park underneath the raised metro  by artist Maarten Struijs , its name a deliberate play on the fact that it is a “tail track” at the end of the line. Experts said it was unclear why the train had not been stopped by automatic buffers at the end of the track. Apparently something went wrong technically, possibly combined with human error. Surprisingly the sculpture built of plastic have saved the train from falling down, even after 20 years the sculpture made of pl...

 SURAT METRO Project Name: Surat Metro Rail Project Operator: Gujarat Metro Rail Corporation Limited Owner: Govt. of India and Govt. of Gujarat Project Type: Mass Rapid Transit System (MRTS) Project Cost: INR 12,114 Crores (Phase-I) External Funding Agency: AfD and KfW Total Network Length: 40.35 km Nos. of Corridors: 2 Status: Under-construction Contract Awarded Delhi Metro Rail Corporation:   DPR Consultant. Systra MVA Consulting:   Detailed design consultancy for Corridor-1 from Dream city to Majuragate Elevated Viaduct and Nine Elevated Metro-Rail Stations including Depot at Dream city. Corridor 1 (Red Line): Sarthana to Dream City Route Length: 21.61 km Stations: 20 Stations (Elevated -15.14 km, 14 Stations), Underground -6.47 km, 6 Stations) Station Names: Sarthana, Nature Park, Varachha Chopati, Kapodra Patiya, Laabheshwar Chowk, Central Warehouse, Surat, Maskati Hospital, Chowk Bazar, Majura Gate, Rupali Canal, Althan Tenament, Althan Gam, VIP Road, Women ITI...

 CHENNAI METRO RAIL LIMTED Project Name: Chennai Metro Rail Project Owner: Govt. of India and Govt. of Tamilnadu Operator: Chennai Metro Rail Limited (CMRL) Project Type: Mass Rapid Transit System (MRTS) Project Cost: INR 20,000 Crore (Phase-I) Total Length: 54.1 km Funding Pattern: Govt. of Tamilnadu and Foreign Institution Completion Target: 2021 Phase-II: Future Expansion – 107.59 km Phase-I: Operational – 54.1 km  Major Contractors (Phase I) Delhi Metro Rail Corporation: Consultant for Detailed Project Report (DPR) Egis Rail SA, France: General Consultancy Soma Enterprise: For the construction of a 4.5 km long viaduct along the Inner Ring Road Larsen and Toubro (L&T): For contraction for Elevated viaducts and Koyambedu depot L&T-Alstom JV: For design and construction of track works Johnson-SJEC JV: For supply of lifts and escalators Siemens AG: For the power supply and overhead electrification Alstom: For supply of Roll...