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为研究对拉式挡土墙失稳时的力学响应规律,设计了室内模型试验,监测并分析了对拉式挡土墙在倾覆破坏和沉降破坏时墙背侧向土压力分布特征及拉筋应力的变化规律。研究结果表明,在对拉式挡土墙发生倾覆破坏时,倾覆端侧向土压力普遍增大,整体呈抛物线形式,沉降端土压力普遍减小;单拉筋条件下的沉降破坏,随着沉降量的增加,拉筋应力逐渐增大,倾覆端土压力在拉筋作用下呈现出倾覆破坏时的土压力分布,沉降端土压力整体呈先增后减的趋势且拉筋上部土压力变化幅度远大于拉筋下部;多拉筋条件下的沉降破坏,上部拉筋钢筋应力迅速减小,下部拉筋迅速增大,其墙背土压力与单拉筋条件下的墙背土压力相似,因此,在易发生不均匀沉降地段的对拉式挡土墙应加强下部拉筋及挡土墙墙身的强度。
In order to study the mechanical response law of the pull retaining wall instability, an indoor model test was designed to monitor and analyze the distribution characteristics of the lateral earth pressure on the wall of the pull retaining retaining wall and the reinforcement Stress changes. The results show that when overturning failure occurs on the pull retaining wall, the lateral earth pressure generally increases in the overturning end, which is in the form of a parabola, and the earth pressure on the settlement side generally decreases. The settlement failure under the condition of single tensioning tendon With the increase of settlement, the stress of tendon increases gradually. The earth pressure of overturning end shows the distribution of earth pressure under overturning. The earth pressure at the settlement end increases first and then decreases and the change of earth pressure The amplitude is much greater than the lower part of the tie bar; the settlement under the condition of multi-tie bar breaks down; the stress of the upper tie bar decreases rapidly and the lower tie bar increases rapidly; the pressure of the back wall is similar to the wall- As a result, the strength of the lower retaining wall and the wall of the retaining wall should be strengthened in the pull retaining wall where the uneven settlement is prone to occur.