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在透水的深覆盖层上建造土石坝,常采用就地灌注的混凝土防渗墙来截断坝基渗流。由于刚性的混凝土墙夹在较柔性的砂砾坝基中,致使合理地确定混凝上防渗墙上的应力成为一个难题。本文提出坝体及坝基用非线性土体单元、混凝土防渗墙用线性梁单元、墙与两侧的砂砾之间用摩擦接触单元等三种单元组成的非线性有限元法,分析了大渡河铜街子左深槽堆石坝的应力应变,论证了坝基深槽中的两条混凝土防渗墙都是偏心爱压构件,求得的应力能力一般混凝土所承受。
Earth-rock dams are constructed on a water-permeable deep overburden, often using in-situ perforated concrete cutoff walls to intercept dam seepage. Due to the rigid concrete wall sandwiched in a more flexible sand and gravel dam, resulting in a reasonable to determine the anti-seepage wall coagulation on the stress becomes a problem. This paper presents a nonlinear finite element method which is composed of three elements: nonlinear soil element for dam body and dam foundation, linear beam element for concrete cutoff wall, rubbing contact element between the wall and gravel on both sides, The stress and strain of the left-deep-rockfill dam in Tongjiezi are demonstrated. The two concrete impervious walls in the deep foundation of the dam foundation are both eccentric and inhomogeneous, and the stress capacity obtained by the concrete is acceptable.