严寒强震区特高拱坝筑坝关键技术难题及应对措施

发布时间：2018-09-13 10:34

【摘要】：以分析严寒、强震区修建特高拱坝的关键技术为目标,针对QBT工程特高拱坝建基面选择、坝体应力控制及动力反应分析、坝肩变形稳定、坝体开裂控制、大坝整体抗灾能力等关键技术问题,采取了体形裕度设计、智能温控、综合抗震控制等应对措施。结果显示,多目标优取的拱坝体形,具有适应性强、抗震性能好、安全度充足、整体安全性高等特点。结果表明,结合智能温控措施,低热水泥及坝体全断面保温的采用可有效地降低温度应力,控制裂缝的产生,解决严寒地区工程工期短、浇筑量大、温控与浇筑强度需协调一致等系列控制工期的施工矛盾,保障建设期及运行期的工程安全运行。综合抗震措施的采用使坝体在设计地震作用下,整体性好,满足抗震设计要求。研究成果为今后在严寒强震区筑坝提供了更多有益的参考。
[Abstract]:Aiming at the analysis of the key technology of constructing super high arch dam in severe cold and strong earthquake area, aiming at the selection of foundation surface, stress control and dynamic response analysis of QBT project, the deformation of dam abutment is stable and the dam body cracking is controlled. Some key technical problems, such as the dam's overall anti-disaster ability, have been adopted, such as shape margin design, intelligent temperature control, comprehensive seismic control and so on. The results show that the multi-objective optimum arch dam has the characteristics of strong adaptability, good seismic performance, sufficient safety degree and high overall security. The results show that, combined with intelligent temperature control measures, the application of low-heat cement and full-section insulation of dam body can effectively reduce the temperature stress, control the occurrence of cracks, and solve the problem of short construction period and large amount of pouring in severe cold areas. The temperature control and pouring strength should be coordinated to control the construction contradictions during the construction period and ensure the safe operation of the project during the construction and operation periods. The adoption of comprehensive seismic measures makes the dam under the action of design earthquake, the integrity of the dam is good, and meets the requirements of seismic design. The research results provide more useful references for dam construction in severe cold earthquake areas in the future.
【作者单位】：中水北方勘测设计研究有限责任公司;
【分类号】：TV52;TV642.4

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