摘要
土石坝沉降监测是用来掌握坝体状态、确定最终坝高、验证指导设计施工的重要手段。为使监测分析模型深入揭示施工期沉降规律,从遗传蠕变理论出发,将监测模型分解为确定部分和统计部分,组合形成混合模型。模型针对施工期填筑的特点,考虑了填筑进程及材料蠕变特性对沉降的影响。根据实用现况,在有限元基础上建立沉降填筑确定模型部分,采用遗传蠕变思想构造能体现填筑进程影响的统计因子,以回归计算求解参数建立混合模型。实例证明,模型效果很好,有利于对填筑期土石坝沉降的监控和预测。
Embankment dam settlement monitoring is an important way to know dam conditions. It is directly related to the safety of dam structure, to the determination of the final height of the dam. To analyze its regulations during construction, settlement monitoring hybrid model is presented based on genetic creep idea. Construction processes and material creep particularity have been considered. The model is divided into deterministic part and statistic part according to genetic creep constitutive model. FEM is used to establish deterministic part in the model; factors reflecting the genetic creep’s effect have been used in model’s statistic part. These two parts have been fit together by regression analysis to establish hybrid model. An example has been given. It shows that the hybrid model is very good to imitate and forecast the dam settlement during construction.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2004年第z2期164-166,173,共4页
Rock and Soil Mechanics
关键词
蠕变
填筑
沉降监测
混合模型
creep
construction
settlement monitoring
hybrid model
