拱坝结构诱导缝力学参数反演分析及工程应用

确定设置在拱坝结构中的诱导缝力学参数是工程界的一个难题，一直未能很好解决。本文提出了一种新方法，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，对诱导缝接触面的力学参数进行反演，较好地解决了该问题。并针对超大型实际工程小湾拱坝进行应用，结果表明通过对诱导缝面的法刚和切刚力学参数反演，有限元计算值与实际监测值吻合较好；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。本方法很好地解决了实际工程问题，具有相当的参考意义。

Back Analysis on Mechanical Parameters of the Induced Joint in Arch Dam and its Application in Practical Engineering

The determination of key parameters of induced joint in arch dam is a difficult problem, which have not been well solved in practical engineering. The paper presents a new combined method of the BP neutral networks method and FEM method, which can solve the above practical problem. As an example, the key mechanical parameter of the induced joint in Xiaowan arch dam,which is a super practical engineering, is back analysed; it shows that with the back analysis of the key mechanical parameters of the induced joint, the calculated results by the FEM method are in accordance with the observed results; the induced joint is wholly compressed; the compressive stress of the induced joint near the upstream dam heel is larger than that near the downstream end.