| 摘要: |
| 大坝安全一直是水利工程重点关注的问题，对坝体极限承载能力的探究和安全度的评价更好的指导了工程的设计及维护。对此，本文结合某碾压混凝土重力坝工程，采用水头超载法、容重超载法和强度折减法做出极限承载能力评估，并确定其安全系数，通过对比三种方式对其安全度做出评价。结果表明水头超载法对碾压混凝土重力坝极限承载能力的影响更加敏感，但在实际工程中常采用强度折减法来确定坝体的安全系数，其取值更加准确。该研究系统阐述了三种极限承载能力评估方法在仿真计算中对坝体的破坏机理，明确了强度折减法在实际工程中确定重力坝极限承载能力的准确性，为其他工程极限承载能力评估仿真计算提供借鉴。 |
| 关键词: 大坝安全，碾压混凝土重力坝，超载法，强度折减法，极限承载能力，安全度评价 |
| DOI： |
| 分类号:TV642.2 |
| 基金项目:国家重点研发计划项目(2021YFC3090102,2021YFC3090104)；国家自然科学基金 (52192672) |
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| Evaluation of the ultimate bearing capacity and safety ofRCC gravity dam |
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ZHANG Kaiheng, WANG Zhenhong, ZHANG Bu, WANG Juan
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Institute of Structural Materials,China Institute of Water Resources and Hydropower Research
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| Abstract: |
| Dam safety has always been a key issue in water conservancy engineering, and the exploration of the ultimate bearing capacity of the dam body and the evaluation of the safety degree can better guide the design and maintenance of the project. In this paper, combined with a RCC gravity dam project, the head overload method, the bulk density overload method and the strength reduction method are used to evaluate the ultimate bearing capacity, and the safety factor is determined, and the safety degree is evaluated by comparing three methods. The results show that the head overload method is more sensitive to the influence of the ultimate bearing capacity of RCC gravity dam, but the strength reduction method is often used to determine the safety factor of the dam body in actual engineering, and its value is more accurate. This study systematically expounds the failure mechanism of the dam body in the simulation calculation of the three ultimate bearing capacity assessment methods, and clarifies the accuracy of the strength reduction method in determining the ultimate bearing capacity of gravity dams in actual engineering, which provides a reference for the simulation calculation of the ultimate bearing capacity evaluation of other projects. |
| Key words: dam safety, RCC gravity dam, overload method, strength reduction method, ultimate bearing capacity, safety evaluation |
