ISSN:
1570-1468
Source:
Springer Online Journal Archives 1860-2000
Topics:
Energy, Environment Protection, Nuclear Power Engineering
Notes:
Conclusions Field observations of the behavior of the dam during accumulation of a mudflow, geological investigations, and laboratory investigations lead to the following conclusions. 1. When designing mudflow-retaining dams made from the rock, construction of watertight elements on the upper pool side is practically useless, since the mud deposits themselves successfully form a facing and impervious blanket. 2. The seepage flow through the dam comes from a comparatively small layer of water accumulated on top of the mud deposits due to the river runoff following the mudflow. The mud deposits themselves contribute negligible seepage. 3. When placing earth in the dam by the combined method (blasting and filling) it is necessary to take into account the difference in the seepage properties of the zones constructed by the different methods. When earth is placed by heavy-duty trucks the permeability is considerably lower than in the case of an embankment constructed by blasting. 4. In view of the absence of experience in operating mudflow-retaining dams (excluding the 1973 mudflow) increased requirements must be imposed on the design of drains and discharges, provided the dam is not calculated for brief discharge of the water that seeped along the downstream slope. 5. Retention of the disastrous mudflow by the Medeo dam proved that it is possible to control this menacing natural phenomenon. 6. The insignificant settlement of the dam crest (about 10 cm) following rapid flooding of the dam soils indicates high operating qualities of the embankment constructed by the massive blasting method. 7. The construction of mudflow-retaining structures does not eliminate the need for other measures of controlling mudflows (lowering of the levels of morainal lakes, forest-improvement and channel-regulating measures, etc.). Only a combined approach will create a reliable protection system.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02379032
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