摘要
针对积石峡面板堆石坝的开挖料进行了湿化试验,结果表明开挖料的湿化剪应变主要与当前应力水平有关;湿化体应变不仅与当前的围压有关,还与当前的应力水平有关。在分析试验得出的基本规律的基础上改进了沈珠江湿化模型,与试验结果对比表明该模型能够较妤地模拟开挖料的湿化特性,并可以模拟开挖料湿化变形的剪胀性。基于改进的湿化模型对积石峡面板堆石坝蓄水引起的湿化变形进行了三维有限元分析。结果表明大坝蓄水后坝体发生指向下游的顺河向位移及竖向沉降增量;面板的挠度增大,顺坡向压应力出现压应力增量;面板水平向压应力和拉应力均有所增加,拉应力仍主要分布在面板两侧。
Slaking test of excavation materials is carried out for Jishixia concrete faced rockfill dam. The test results show that slaking volume strain depends on both current stress and stress level. A modified slaking model is proposed based on test results and Shen Zhujiang slaking model, and it is validated by the test results to confirm the capability of simulating slaking deformation and dilatancy of excavation materials. Three dimensional finite element analysis is performed to study the slaking defomation caused by the water storage. The analysis results show that the displacements along the river and settlement of the dam, the deflection of face slabs, the compressive stress of face slabs along the slope, both the tension and compressive stress of face slabs in the horizontal direction are increased, and the tensile stresses of face slabs are mainly located on the both sides of the dam.
出处
《水力发电学报》
EI
CSCD
北大核心
2009年第2期56-60,共5页
Journal of Hydroelectric Engineering
基金
国家"973"科技发展计划课题(2007CB714108)
北京市自然科学基金(8061003)
关键词
水工结构
湿化变形分析
湿化试验
开挖料
改进的湿化模型
hydraulic structure
slaking deformation analysis
slaking test
excavation materials
modified slaking model
