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首页> 外文会议>International Congress on Conservation and Rehabilitation of Dams, Nov 11-13, 2002, Madrid, Spain >Improvement of stability of masonry dams
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Improvement of stability of masonry dams

机译：改善砌筑大坝的稳定性

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State of Maharashtra (India) has a long history of building high dams. Most of these dams are constructed in stone masonry because it was cheap and labor oriented. These dams were designed based on the design criteria prevalent at that time. Uplift and Seismic forces were not considered in those designs. Though there were earthquakes in this area, a wide spread belief arose that the deccan penisula is non-seismic. This was so because of absence of systematic records of such events in the historical period. This belief got strengthened further because of absence of any active fault zones in trap rocks covering the basement formations. However, in view of the following major events, a fresh look into the seismic potential of the area was felt necessary. a) Koyna Earthquake 6.5 M 11th Dec' 1967 b) Bhatsa-Khardi Earthquake 4.9 M 15th Sept' 1983 c) Killari Earthquake 6.3 M 30th Sept' 1993 In the Indian standard (1960) for seismic designs, the Maharashtra state was earlier shown as non-seismic but in subsequent revisions (1962, 1966, 1970, 1975, 1984) entire area has been classified into various seismic zones with varying degree of seismicity. The killari earthquake, which took a toll of human life of about 10,000 occurred in an area with no evidence of any significant seismic activity in the past. Considering the importance of the dams in the state, Government appointed an expert committee to review the stability of the dams. The main terms of reference were as below: a) To review the seismic activity in state and decide seismic parameters b) To review the design standard adopted for the existing dams and suggest modifications, if any c) To suggest strengthening measures to be adopted in case of existing dams Twenty six important dams in the state were identified and referred to the committee. The committee comprised of experts in the field of seismology and dam engineering. The Central Designs Organisation being the prime body entrusted with work of dam designs in the state was associated with the working of the committee. The deliberations and the final recommendations made by the committee have helped the state in setting an approach to tackle similar situations in future as there are no standards for retrofitting.
机译：马哈拉施特拉邦（印度）建高坝的历史悠久。这些水坝中的大多数都是用砖石砌成的，因为它价格便宜且以劳动力为导向。这些水坝是根据当时流行的设计标准设计的。在这些设计中未考虑提升力和地震力。尽管该地区发生了地震，但人们普遍认为，德干半岛是非地震的。之所以如此，是因为缺乏历史时期此类事件的系统记录。由于在覆盖地下地层的圈闭岩石中不存在任何活动断层带，这一观点得到了进一步加强。然而，鉴于以下重大事件，有必要重新审视该地区的地震潜力。 a）1967年12月11日科伊纳地震6.5 M地震b）1983年9月15日Bhatsa-Khardi地震4.9 M c）1993年基利地震1993年9月30日6.3 M地震在印度标准（1960年）中，马哈拉施特拉邦被表示为非地震，但在随后的修订版（1962、1966、1970、1975、1984）中，整个区域被划分为具有不同地震活动度的各个地震带。 Killari地震造成了约10,000人丧生，该地区过去没有发生任何重大地震活动的迹象。考虑到水坝在该州的重要性，政府任命了一个专家委员会来审查水坝的稳定性。主要职权范围如下：a）审查状态下的地震活动并确定地震参数b）审查现有大坝采用的设计标准并提出修改建议（如有）c）建议在水坝中采取的加强措施现有大坝案例确定了该州的26座重要水坝，并将其移交给委员会。该委员会由地震学和大坝工程领域的专家组成。中央设计组织是该州负责大坝设计工作的主要机构，与委员会的工作有关。该委员会的审议和最终建议帮助该州制定了一种解决未来类似情况的方法，因为目前尚无改造标准。

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