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本文采用Duncan等人建议的以切线杨氏模量和体积模量为参数的计算模型,对三峡二期工程的两道混凝土防渗墙围堰的设计方案进行了应力应变分析,着重研究了墙侧壁摩阻力的影响。计算结果表明,混凝土墙内应力受两种因素控制:一是水压力产生的挠曲应力;另一种是土体下沉时通过侧壁摩阻力传给墙的压缩应力。下游墙以压缩应力为主,上游墙则以挠曲应力为主,局部有较大的拉应力。文中建议合理安排施工顺序,充分利用墙的侧壁摩阻力以减小拉应力。
In this paper, the calculation model of tangential Young’s modulus and bulk modulus proposed by Duncan et al. Was used to analyze the stress and strain of the design of two concrete cutoff wall cofferdam of the Three Gorges Project. The stress of wall Side wall friction. The calculation results show that the stress in the concrete wall is controlled by two factors: one is the flexural stress caused by water pressure; the other is the compressive stress transmitted to the wall through the friction resistance of the sidewall when the soil sinks. Downstream of the wall to compressive stress, the upper reaches of the wall is the main flexural stress, local larger tensile stress. In this paper, it is suggested to arrange the construction sequence reasonably and take full advantage of the wall friction to reduce the tensile stress.