大岗山水电站高拱坝蓄水初期工作性态演化研究

doi:10.13722/j.cnki.jrme.2019.0001

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摘要高拱坝的位移、应力状态是拱坝在蓄水初期重点关注的问题。将微震监测技术与有限元数值模拟相结合，研究拱坝微震变形与坝体应力的内在关联，对蓄水初期拱坝的应力、位移变化规律进行分析，探究拱坝蓄水初期工作性态演化规律，提出利用微震事件判断拱坝真实受力状态的方法。研究表明：拱坝微震事件与坝体应力在时空分布上存在一致性，坝体高压应力的集中和迁移是微震事件萌发的内在驱动力。蓄水前，拱坝高压应力集中在坝踵区域，微震变形也聚集在坝踵区域。蓄水后，拱坝的高压应力集中区域和微震变形聚集区域均从坝踵转移到坝趾区域，同时拱坝主拉应力区域实现了从拱端到坝踵的转移。通过微震事件的比值累积频率分布特征可以推断出拱坝在不同蓄水时期应力集中区域的分布情况。研究成果对于研究高拱坝真实工作性态具有一定的参考价值。

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	马克1
	2
	王龙江3
	庄端阳1
	2
	龙丽吉 3
	张国新4
	吕鹏飞5

关键词 ：岩石力学, 高拱坝, 微震监测, 数值模拟, 蓄水初期, 工作性态

Abstract：The displacement and stress state of high arch dams are the key concerns of arch dams during the initial impoundment period. In this paper，adopting the microseismic monitoring technology in combination of finite element numerical simulation，the internal correlation between microseismic deformation and stress in arch dam was studied，and the change laws of stress and displacement during the initial impoundment period were analyzed. The evolution law of working behavior during the initial impoundment period was investigated，and a method for judging the actual stress state of the arch dam by microseismic events was proposed. The results show that the microseismic events are consistent with the stress distribution of the arch dam in space and time and that the concentration and migration of the high compressive stress of the arch dam are the internal driving force of microseismic events. Both the high compressive stress and the microseismic deformation are concentrated on the dam heel before impoundment while transferred from the dam heel to the dam toe after impoundment. It is also revealed that the principle tensile stress zone is transferred from the arch dam abutment to the dam heel after impoundment. The distribution of the stress concentration area of the arch dam in different impoundment periods can be inferred from the cumulative frequency distribution of of microseismic events. The results can provide a certain reference for the study on actual working performances of arch dams.

Key words： rock mechanics high arch dam microseismic monitoring numerical simulation impoundment period work performance

引用本文:

马克1，2，王龙江3，庄端阳1，2，龙丽吉 3，张国新4，吕鹏飞5. 大岗山水电站高拱坝蓄水初期工作性态演化研究[J]. 岩石力学与工程学报, 2019, 38(9): 1776-1785.
MA Ke1，2，WANG Longjiang3，ZHUANG Duanyang1，2，LONG Liji3，ZHANG Guoxin4，LV Pengfei5 . Study on working performance evaluation of the high arch dam of Dagangshan#br# hydropower station during the initial impoundment period. , 2019, 38(9): 1776-1785.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0001 或 http://www.rockmech.org/CN/Y2019/V38/I9/1776

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