广东省大中型水库土坝的地震危害性的初步评估

众所周知,水库是可能产生灾难性地震灾害的工程之一,广东省现有大中型水库近三百座（图1）,其中土坝占93％,这些水库大多已建成数十年;建库当时也未充分考虑地震影响,为了响应“国际减灾十年”的号召,有关部门要求对这些水库的土坝进行震害预测,以便进行科学的工程决策,达到减轻地震灾害的目的。显然,这项任务既重要又繁重。为此,提出两步评估方法：第一步为初评（或称速评）,初评认为地震危害性不高的土坝,原则上可不再进行第二步－－详评,这样,大大减少了详评的工作量,已完成的初评结果表明,需进行详评的土坝占全部土坝的12％。

THE PRELIMINARY ASSESSMENT OF SEISMIC RISK AT RESERVOIR DAMS IN GUANGDONG PROVINCE

Reservoir is one of the engineerings which may produce the second disaster from serious earthquakes. There are more than 300 middle and large reservoirs in Guangdong Province, China, of which many reservoirs were built in more than several ten years and during the building of reservoirs, earthquake effect was not considered fully. For the sake of responding the call of" International Decade of Natural Disaster Reduction", it is necessary to analyse the seismic risk of reservoir dams on wide in range and large in number. AS the task is very huge, two methods of assessment are put in this paper. The first one is the preliminary assessment, the second one is the detail assessment which is based on the first one and it is thought of high seismic risk. Here with the method, the result of preliminary assessment are introduced.