摘   要：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。

Abstract: To study the mechanics response law of mutually anchored retaining wall in unstability, indoor model tests were designed to monitor and analyze changing rules of lateral earth pressure distribution of wall and the changing rules of anchor-bar stress, in the case of overturning and destruction. The results show that, when the tied double retaining wall overturns, end later earth pressures of overturns increase generally, overall forms parabolic, earth pressures of settlement end generally decreases. Under the condition of single rebar, when settlement destruction of the tied double retaining walls happens, with the increase of settlement, rebar stress is increased gradually, under the reaction of rebar, side of overturnings shows earth pressure distribution as overturning, earth pressures of settlement end shows a trend of increasing after decreases first, and earth pressure in upper brace changes bigger than the lower brace; under the condition of multi-strand rebar, when settlement destruction of the tied double retaining walls happens, steel bar stress of upper rebars decreases rapidly, the lower increases quickly, the earth pressure is similar with single rebar, therefore, the tied double retaining wall should strengthen the lower rebar and strength of retaining wall when area easily occurs uneven settlement.