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葫芦口大坝是采用浆砌条石坝顶溢流式重力坝,在坝基下有五条向下游倾斜的软弱夹层,抗滑能力较差。因此,必须研究大坝的稳定性及应力分布规律。这是一个非线性问题。作者采用平面矩形与三角形组合单元,给出了弹塑性矩阵,应用NEWTON——REPHSON法解材料非线性问题。在每次迭代中,用乔列斯基法解代数方组组,编制了TQ—16电子计算机程序。在计算葫芦口问题时,将荷载分组用增量方法计算得到调整后的应力分布,并与实验作了对比,结果较好。
The Hulukou Dam is a flooded gravity dam with a mortar and stone crest. There are five weak intercalations below the dam foundation, which have poor anti-sliding capability. Therefore, the stability and stress distribution of the dam must be studied. This is a non-linear problem. The author uses a combination of planar rectangles and triangles to give an elasto-plastic matrix. Newton-REPHSON method is used to solve the nonlinear problem of materials. In each iteration, the Cholesky method was used to solve the algebraic group and a TQ-16 computer program was developed. When calculating the problem of the gourd mouth, the stress distribution of the adjusted group was calculated by incremental method, and compared with the experiment, the result was better.