基于小概率事件法估计大坝混凝土实际抗拉强度  

Estimation of Actual Tensile Strength of Dam Concrete Based on Small Probability Event Method

作　　者：黄耀英[1] 郑宏[2] 周宜红[1] 武先伟[1] 

机构地区：[1]三峡大学水利与环境学院,宜昌443002 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071

出　　处：《武汉理工大学学报》2012年第3期86-90,共5页Journal of Wuhan University of Technology

基　　金：国家杰出青年基金(50925933);国家自然科学基金(51079079);湖北省教育厅科学技术项目(D20101207)

摘　　要：结合三维弹性徐变仿真计算公式分析了应变计组实测值转化为实际应力的计算公式,认为当前采用应变计组实测应变计算三维空间实际应力的公式不够完善,给出了理论严谨的应变计组测值转化三维空间实际应力计算公式。提出了利用小概率事件法估计大坝混凝土实际抗拉强度,结合混凝土大坝埋设的应变计组和无应力计实测值,采用小概率事件法初步探讨了大坝混凝土的实际抗拉强度和极限拉伸变形的估计,实践表明,当获得应变计组长时间测值系列,以及获得较多的应变计组的测值样本后,基于小概率事件法可以得到符合大坝混凝土实际情况的抗拉强度和极限拉伸变形。The calculation formula of transforming the stress measured by strain gauge group into the actual one was analyzed in this paper by combining three dimensional（3D） elastic creep simulation calculation formula.It is believed the current 3D spatial actual stress formulas calculated by measured value of the strain gauge group are not perfect.Therefore,the theoretical rigorous formula of strain gauge group＇s measured value transforming to 3D spatial actual stress was provided in this paper.Furthermore,the way of estimating the concrete dam practical tensile strength through small probability events method was put forward,and the estimation of actual tensile strength and ultimate tensile strain was also it preliminarily studied by small probability event method.It is demonstrated by the engineering practices that when getting a long time strain gauge measurements series and more strain gauge group measured samples,it can obtain the actual situation of the tensile strength and ultimate tensile strain conform to the concrete dam based on small probability event method.

关 键 词：小概率法 混凝土大坝 应变计组 实际应力 抗拉强度 

分 类 号：TU502.6[建筑科学—建筑技术科学] TU528.36