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为了研究公路黄土地基在上部荷载作用下的蠕变规律、工后沉降以及相应处理措施,通过原位静力荷载试验,对其流变曲线进行粘弹粘塑性分析,并应用附加应力原理,求取一定高度路堤下地基土体的最终沉降变形公式。结果表明:流变曲线主要分初始蠕变和稳定蠕变2个阶段,流变模型包含了粘性、弹性、塑性3个部分,当时间趋于无穷大时,其荷载与应变呈幂函数关系;当路堤高度H≤3 m时,可采用一般压实机械处理地基;当3 m6 m时,应采用重型压实机械处理地基。
In order to study the creep regularity, post-construction settlement and corresponding treatment measures of highway loess foundation under the action of the upper load, the visco-visco-viscoplastic analysis of the rheological curves of the highway loess foundation is carried out by the in-situ static load test and the additional stress principle Take the Final Settlement and Deformation Formula of Soil under a Certain Height of Embankment. The results show that the rheological curve is divided into two stages: initial creep and stable creep. The rheological model includes three parts: viscosity, elasticity and plasticity. When the time reaches infinity, the load and strain show a power function relationship. Embankment height H ≤ 3 m, the general compaction machinery can be used to deal with the foundation; when 3 m 6 m, heavy compaction machinery should be used foundation.