摘要
针对拱坝结构诱导缝力学参数取值困难的问题,本文提出采用BP神经网络方法与有限单元法相结合的联合反演方法,对诱导缝接触面力学参数进行确定。该方法应用于小湾拱坝的计算分析,结果表明通过对诱导缝面关键力学参数的反演,有限元计算值与实际监测值吻合较好;在当前施工浇筑状态下整个诱导缝面处于受压闭合状态,诱导缝靠近上游侧的压应力和挤压变形大于靠廊道侧的压应力和挤压变形,并且中间坝段大于两端坝段。计算结果表明,本文所提出的方法对诱导缝力学参数取值是可行的。
The paper presents a new method combining the BP neutral networks method with FEM method,which can solve the difficult problem of determining the key parameters of induced joints in arch dams.As an example,the parameters of the induced joint in Xiaowan Arch Dam are analyzed according to the monitored data.It shows that the calculation result of FEM based on the parameters obtained from back analysis is in accordance with the observed result.The induced joint is closed in the process of construction.The compressive stress of the induced joint in the vicinity of the upstream dam heel is larger than that in the downstream end.The results verify the feasibility of the proposed method for determining the key parameters of induced joints.
出处
《水利学报》
EI
CSCD
北大核心
2010年第5期575-580,共6页
Journal of Hydraulic Engineering
基金
国家自然科学基金项目(50679066)
