小浪底土石坝心墙拱效应分析

发布时间：2018-07-03 06:48

本文选题：拱效应系数 + 土石坝心墙　；参考：《人民黄河》2017年09期

【摘要】：结合小浪底大坝监测资料,基于有效应力算法,采用一个能表征心墙拱效应强弱的评价指标,对大坝心墙拱效应进行计算。结果表明:施工期拱效应系数变化较稳定,竖向范围内坝体上部的拱效应比下部显著,同一高程拱效应系数中间部位最小,向上游和向下游逐渐增大,土压力呈马鞍形分布,心墙中部附近土压力最小;运行期同一高程拱效应从上游到下游依次减弱,拱效应系数主要受库水位和土体固结排水因素的影响,短期内受库水位影响大,长期则受土体固结排水的影响,拱效应系数的变化与库水位变化正相关,从总体趋势看,拱效应系数在缓慢减小;所有测点拱效应系数均大于零,说明坝体处于安全状态。
[Abstract]:Based on the monitoring data of Xiaolangdi Dam and based on the effective stress algorithm, an evaluation index is adopted to calculate the effect of the core arch of the dam. The results show that the arch effect coefficient changes steadily during the construction period, the arch effect of the upper part of the dam is more significant than that of the lower part in the vertical range, the middle part of the arch effect coefficient of the same elevation is the smallest, and the upstream and downstream gradually increase, and the earth pressure is saddled. The earth pressure near the middle part of the core wall is the smallest, the arch effect of the same elevation decreases from upstream to downstream, the arch effect coefficient is mainly affected by the water level of reservoir and the consolidation and drainage of soil, and the influence of water level of reservoir is great in the short term. Under the influence of soil consolidation and drainage for a long time, the change of arch effect coefficient is positively related to the change of reservoir water level. From the general trend, the arch effect coefficient is decreasing slowly, and the arch effect coefficient of all measured points is greater than zero, which indicates that the dam body is in a safe state.
【作者单位】：长沙理工大学水利工程学院;中南大学土木学院;湖南水利水电职业技术学院;
【分类号】：TV641.41

【相似文献】