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结合某在建高速公路工程,采用FLAC有限差分计算方法,研究了不同情况下路基的沉降变形规律。研究结果表明:在同一高度处,沉降值由路基中心处向路肩逐渐减小,地基沉降在路基总沉降中占绝大部分。在填土初期,沉降随时间的推移呈线性增长;路基填筑完成后,沉降随时间的推移呈曲线增长,且增长速率逐渐减缓。根据公式(1)～(6)可确定不同填高路基的工后沉降值。由于计算时参数选取的误差,理论计算值一般比实测值偏大。本文的研究成果能为工程的设计及施工提供参考。
Combined with a highway project under construction, FLAC finite difference method is used to study the settlement law of subgrade under different conditions. The results show that at the same height, the settlement value decreases gradually from the center of embankment to the shoulder of the road, and the settlement of foundation accounts for the vast majority of total subsidence. During the initial period of filling, the settlement increased linearly with the passage of time. After the roadbed was completed, the settlement increased curve with the passage of time and the growth rate gradually slowed down. According to formula (1) ~ (6), the post-construction settlement of different embankment can be determined. Due to the error of parameter selection during calculation, the theoretical calculation value is generally larger than the measured value. The research results of this paper can provide reference for the design and construction of the project.