سال انتشار: ۱۳۸۴

محل انتشار: سمپوزیوم برآورد عدم قطعیت در مهندسی سد

تعداد صفحات: ۷

نویسنده(ها):

W. G. BRUNNER – Marketing Director, BAUER Maschinen GmbH, Schrobenhausen, Germany, Wolfgang

چکیده:

In the far north of Uttar Pradesh Province in the Indian Himalayas, the 280 MW Dhauliganga hydroelectric power plant is under construction by National Hydroelectric Power Corporation (NHPC), a state-owned enterprise, and a joint venture of Kajima Corporation of Tokyo and Daewoo Corporation of Seoul. This project sets out to develop the lower section of the mountain cascade of the Dhauliganga River, a tributary of the Sarda River, with a 311 m gross head. The 1360 km2 mountainous catchment area is bounded in the north-east by the Chinese border and in the south-east by the Nepalese border. The dam project is located in a remote area north of the principal town of Darchula of the upper Sarda valley, which is one of the seismically most active regions of India. The 56 m high rock fill dam, which will be the first of its kind in India, is faced with concrete and has a 1 m thick, at its crown 270 m long and over 70 m deep cut-off wall of plastic concrete below its toe. The cut-off wall, with a total area of 8000 m2, is constructed by a combination of Bauer hydraulic grabs, assisted by chisels and a Bauer BC 40 cutter which enables the overlapping joint system to be installed, guarantees optimum verticality and enables the cut-off to be keyed into the bedrock formation. The geological conditions – alluvial overburden, rock boulders, steep rock slopes – would have made the installation of a conventional grout curtain extremely difficult. In consequence the cutoff wall was employed in preference to a grout curtain. The cut-off wall was started in January 2002 and was successfully completed by March 2003