静止状态下悬臂式挡墙土压力分布规律研究

Study on Earth Pressure Distribution Regularity of Cantilever-type Retaining wall Under Stationary State

将模型试验与数值模拟相结合,研究上覆荷载、墙身混凝土强度、挡墙宽高比等因素对悬臂式挡墙墙背土压力分布的影响规律。结果表明:悬臂式挡墙墙背土压力在一定范围内随挡墙高度的减小呈线性增加,在墙踵处出现拐点,土压力明显减小,拐点大约在挡墙高度的1/8处;在上覆荷载作用下墙背土压力呈S形分布,沿挡墙高度降低的方向墙背土压力受填土自重应力的影响要大于附加荷载;随着墙身混凝土强度的增加,墙背土压力逐渐增大,但增幅较小;挡墙宽高比对挡墙上部墙背土压力影响较明显,对挡墙下部墙背土压力影响不大。

The influence regularity of such factors as overlying load,wall concrete strength and aspect ratio of retaining wall on earth pressure distribution of cantilever-type retaining wall back was studied by combining the model test with numerical simulation.The results show that the earth pressure of cantilever-type retaining wall back increases linearly with the retaining wall height decreasing in a certain range,the inflection points appear in the wall heel and the earth pressure decreases obviously,the inflection point is at about 1 /8 of the retaining wall height,earth pressure of wall back shows S-shape distribution under the action of the overlying load,which is more affected by soil self-weight stress than by additional load along the direction of the retaining wall height decreasing.The earth pressure of wall back increases gradually but the increasing amplitude is small with wall concrete strength increasing,the influence of retaining wall aspect ratio on earth pressure of top retaining wall back is obvious,which has little influence on earth pressure of lower retaining wall back.