摘要
以原型监测为基础,采用实测值分析与理论推导相结合的方法,对小湾特高拱坝抗力体置换体与围岩接触带的界面应力、接缝开合度进行分析和评价。分析表明:接触带压应力在蓄水过程呈规律性变化,水位升高阶段界面压应力增幅较大,稳压阶段增幅较小;水压和时效是界面压应力的主要影响因素,不同蓄水阶段控制因素不同,蓄水早期受时效因素控制,蓄水后期受水压因素控制。灌浆明显改善了接触带的密实性能,接缝开合度过程线主要经历了温升接缝压密、温降张开和稳定3个阶段,开合度与温度呈非线性关系,用S函数拟合效果较好。综合分析认为,蓄水期接触带结合良好,能较好地传递拱推力,界面处于微受压状态,有较高的安全裕度。
Based on the prototype monitoring,the analysis of the observed data and the theoretical derivation are integrated to analyze and evaluate the contact stresses and joint openings of the replacement reinforcement mass and the surrounding rock mass in the abutment zone of Xiaowan ultra-high arch dam. The analysis shows that the compressive stress in the contact zone regularly changes during the impoundment period. It has large increase amplitude during the increasing period of water levels and has small increase amplitude during the stable period. The water pressure and the time effect are the two main factors for the compressive stress in the contact zone. The key factor is different during different impoundment periods. During the early impoundment period,the key factor is the time effect,and during the later impoundment period,it is the water pressure. The compactness properties in the contact zone are significantly improved by grouting. There are three typical stages in the joint opening hydrographs,namely,compression stage,opening stage and stable stage. A nonlinear relationship is shown between the joint opening and the temperature and can be well fitted by use of the S-function. The integrated analysis indicates that during the impoundment period,the combination in the contact zone is good and the arch thrust can be fairly transferred. The contact face is in a slightly compression state and has a satisfactory safety margin.
出处
《水电自动化与大坝监测》
2010年第4期48-51,72,共5页
HYDROPOWER AUTOMATION AND DAM MONITORING
基金
人力资源与社会保障部留学人员科技活动项目择优资助项目
江苏省自然科学基金资助项目(BK2009479)
关键词
特高拱坝
原型监测
压应力
接缝开合度
综合评价
ultra-high arch dam
prototype monitoring
compressive stress
joint opening
comprehensive evaluation
