猴子岩水电站导流洞堵头稳定性分析
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摘要
猴子岩水电站导流洞快速封堵采用"永临结合堵头方案",堵头结构和封堵工况独具特性,对导流洞堵头稳定性进行系统研究有重要意义。首先,采用分项系数极限状态设计法计算堵头长度;然后,采用抗滑稳定安全系数法对堵头稳定性进行计算复核;最后,采用三维有限元法对堵头结构的极限抗滑稳定性及应力应变特性进行深入分析。计算结果表明,导流洞堵头设计方案满足结构稳定性要求,可为猴子岩水电站顺利下闸封堵以实现提前蓄水发电目标提供理论依据。
Rapid closure of diversion tunnel for Houziyan Hydropower Station adopts "permanent-temporary combined plug" scheme, plugging structures and conditions have new characteristics. It is of great significance to do systematic research on the stability of the diversion tunnel plug. Firstly, the limit state design method of partial coefficient was used to calculate the length of the diversion tunnel plug. Then, the stability of the plug was calculated and checked by the safety factor method of anti-sliding stability. Finally, the three-dimensional finite element method was used to analyze the stability and the stress characteristics of the plug structure. The results showed that the design scheme of the diversion tunnel plug could meet the requirements of structural stability, and provided theoretical basis for the smooth closing of Houziyan Hydropower Station to achieve the goal of early impounding and power generation.
Rapid closure of diversion tunnel for Houziyan Hydropower Station adopts "permanent-temporary combined plug" scheme, plugging structures and conditions have new characteristics. It is of great significance to do systematic research on the stability of the diversion tunnel plug. Firstly, the limit state design method of partial coefficient was used to calculate the length of the diversion tunnel plug. Then, the stability of the plug was calculated and checked by the safety factor method of anti-sliding stability. Finally, the three-dimensional finite element method was used to analyze the stability and the stress characteristics of the plug structure. The results showed that the design scheme of the diversion tunnel plug could meet the requirements of structural stability, and provided theoretical basis for the smooth closing of Houziyan Hydropower Station to achieve the goal of early impounding and power generation.
引文
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[2] 杨静安,罗林.水工隧洞封堵堵头体型结构设计研究[J].南水北调与水利科技,2009(1):104- 106.
[3] 权锋,郭红彦.积石峡水电站导流洞堵头稳定性分析[J].水力发电,2011,37(11):49-51.
[4] 董志宏,丁秀丽,叶三元,等.大型水电工程导流洞封堵体稳定性分析[J].长江科学院院报,2011,28(2):50-55.
[5] 杨阳,肖明.考虑接触面损伤及连续脱开的堵头稳定计算[J].四川大学学报(工程科学版),2011(S1):86- 91.
[6] 汪魁,曹媛,袁鹏.导流洞堵头力学效应及设计影响因素分析[J].水利水运工程学报,2013(5):71-76.
[7] 张超,程保根,郭长江,等.长河坝水电站初期导流洞下闸封堵方案优选研究[J].人民长江,2017,48(9):70-74,98.
[8] 中华人民共和国水利部.SL 279-2016水工隧洞设计规范[S].北京:中国水利水电出版社,2016.
[9] 中国电建集团成都勘测设计研究院有限公司.四川省大渡河猴子岩水电站下闸蓄水规划专题报告[R].成都:中国电建集团成都勘测设计研究院有限公司,2016.
[10] 中国电建集团成都勘测设计研究院有限公司.四川省大渡河猴子岩水电站导流洞封堵设计专题报告[R].成都:中国电建集团成都勘测设计研究院有限公司,2016.
[11] 国家能源局.NB_T 35026-2014混凝土重力坝设计规范[S].北京:中国电力出版社,2015.