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地基反力σ能够反映荷载作用下地基受力的情况,但其在土质路基特别是高压实度土质路基荷载作用下的研究并不多。本文通过现场及室内离心模型模拟土质路基的填筑及放置过程的试验,对地基反力进行研究。研究表明:高压实度土质路基荷载作用下地基反力呈弧形分布,路基宽度范围内地基反力小于γH值,靠近坡脚的路基边坡区域大于γH值。路基中心处地基反力σc与路基宽高比b/H有很大关系,当路基宽高比b/H较小时,σc与γH值差距较大;当b/H较大时,σc与γH值差距减小;当b/H大于10时,σc基本等于γH值。本文结合试验结果得出考虑b/H影响的路基中心处地基反力σc的计算方法,提出新的地基反力沿路基横断面的计算公式,使路基荷载下地基反力的计算结果更接近实际;结合试验得到路基中心处实测地基反力及地基沉降值,对两种中等压缩性土地基在路基荷载作用下的地基反力与地基沉降的关系进行讨论,得出其相关性较好的地基反力系数,为今后土质路基荷载作用下地基反力系数的应用提供了参考资料。
The foundation reaction force σ can reflect the stress of the foundation under the action of load, but there are not many studies on the soil subgrade under the load of soil subgrade. In this paper, on-site and indoor centrifugal models are used to simulate the filling and placement process of soil-subgrade. The results show that the reaction force of the soil foundation is curved with soil subgrade under high compressive load, the reaction force of the foundation within the subgrade width is less than γH value, and the subgrade slope area near the footer is greater than the γH value. The subgrade reaction σc at the center of subgrade is closely related to the subgrade aspect ratio b / H. When the subgrade ratio b / H is small, the difference between σc and γH is large. When b / H is large, σc and γH Value difference decreases; when b / H is greater than 10, σc is substantially equal to γH value. Based on the test results, the calculation method of the foundation reaction force σc at the center of the subgrade considering b / H is obtained, and a new calculation formula of the subgrade reaction along the roadbed is proposed, which makes the calculation of the subgrade reaction more compact under the subgrade load . Combining the measured ground reaction force and ground settlement value measured at the center of embankment, the relationship between the subgrade reaction force and ground settlement under two kinds of medium compressibility soil subgrade is discussed. The reaction coefficient provides a reference for the application of the foundation reaction coefficient under the load of soil subgrade in the future.