By Robert B. Jansen (auth.), Robert B. Jansen (eds.)
The current cutting-edge of dam engineering has been ronmental, and political components, which, although vital, attained via a continual look for new rules and techniques are coated in different guides. whereas incorporating the teachings of the prior. within the final 20 The speedy development in recent years has resulted from the years rather there were significant thoughts, due mixed efforts of engineers and linked scientists, as mostly to a concerted attempt to mixture the easiest of conception and exemplified through the specialists who've contributed to this custom. Accompanying those achievements, there was ebook. those members have introduced large wisdom an important development towards unfastened interchange one of the professional to the duty, drawn from adventure during the international. fessional disciplines, together with open dialogue of prob With the convergence of such exclusive expertise, the op lems and their strategies. The inseparable relationships of portunity for accomplishment used to be colossal. I gratefully hydrology, geology, and seismology to engineering have recognize the beneficiant cooperation of those writers, and been more and more famous during this box, the place development am indebted additionally to different people and enterprises that's based on interdisciplinary cooperation. have allowed connection with their guides; and i've This booklet provides advances in dam engineering that tried to recognize this legal responsibility within the sections were completed lately or are below manner. At the place the fabric is used. those courtesies are deeply ap tention is given to useful points of layout, development, preciated.
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1,2 From an engineering standpoint, it was a tribute to the dam's builders, as the dam resisted unexpectedly large forces; whereas geologically the case involved errors in judgment, as decisions in part were made with insufficient field data for the evaluation of suspected hazards of area and site (Fig. 227). Pertinent facts are as follows: • The disaster involved one of world's highest dams (875 ft/267 meters), which sustained no damage to the main shell or abutments. • The catastrophe was due to a combination of the geological environs, the inherent features of the innercanyon reservoir wall, a major preexisting fault/Old slide plane, and uplift pressures induced by the reservoir water.
A portion of the Easterly sector of the dam fell and now lies upstream from the original face of this sector, indicating that this portion failed after the water level had dropped enough to materially relieve the pressure from the upstream face. 5 LESSONS FROM NOTABLE EVENTS Consultants retained by the Santa Clara Water Conservancy District filed a report on April 19, 1928, stating: The old slide against which the dam rested at the east, its composition of mica schist bedded at an angle of, or approaching 45 ° with the horizontal, practically paralleling the general slope of the canyon wall, and shattered by previous movement, subject to lubrication with water from the reservoir as well as with infiltering rainwater, offered only insecure support to the dam, and this was rendered more precarious by the adoption of a design which did not include adequate foundation drainage.
The Independent Panel, approximately three years earlier, concluded as follows, in its essential concepts stating a detailed conclusion that is fully supported by the subsequent reports of the Interior Panel: The fundamental cause of failure may be regarded as a combination of geological factors and design decisions that, taken together, permitted the failure to develop. The principal geologic factors were (1) the numerous open joints in the abutment rocks, and (2) the scarcity of more suitable materials for the impervious zone of the dam than the highly erodible and brittle windblown soils.