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为掌握垫层结构性能对基底压力和垫层筋带拉力的影响,设计了3种不同垫层结构的软土地基路堤离心模型试验,测试了在路堤荷载作用下的基底压力和垫层筋带拉力等数据。试验数据及分析表明,(1)随垫层结构性增强,路堤中心处的基底压力逐渐减小,路基面范围的基底压力分布由“中大边小”的凸型曲线逐渐变为“中小边大”的凹型曲线;(2)随垫层结构性的降低垫层筋带拉力减小,路堤土体也由静止稳定状态变为主动极限状态;(3)随路堤荷载增加,地基土体状态由弹性进入弹塑性直至塑性屈服,垫层筋带拉力的分布也逐渐由双峰的马鞍型向单峰的抛物线型转变。
In order to understand the effect of the structural properties of the cushion on the pressure of the base and the tensile force of the cushion, three kinds of centrifugal model tests on the embankment of the soft soil foundation were designed and tested under the embankment load. Rally and other data. The experimental data and analysis show that: (1) with the structural enhancement of the cushion, the pressure at the base of the embankment gradually decreases and the pressure distribution at the base of the embankment gradually changes from the convex curve of (2) With the structural improvement of the cushion layer, the tensile force of the tendons decreases, and the embankment soils also change from the static steady state to the active limit state. (3) With the increase of embankment load, The state of soil in the foundation soil is elastic and elastoplastic until the plastic yielding. The distribution of tensile force of cushion tendons gradually changes from the bimodal saddle to unimodal parabola.