西南某机场高填方地基变形与稳定性数值模拟

西南某机场地处喀斯特区域的中心,地质条件复杂,泥岩夹层的炭质泥岩广泛分布。机场填方量大,填方高度一般在30 m以上,最大的填方高度超过100 m,填方填料含大量炭质泥岩,具有块石含量大、级配差、结构复杂、力学特征差异性大等特点。通过数值模拟方法对机场高填方地基变形与稳定性进行了模拟分析,结果表明:高填方坡脚最大水平位移0.8 m,填方体稳定性好,道槽区最大沉降1.0 m,底部地基沉降0.6 m;土面区最大沉降3.0 m,底部地基沉降1.6 m。

Numerical Simulation on Deformation and Stability of High Embankment for an Airport in the Southwest

An airport, locating in the center of karst area in the southwest, is in complex geological conditions with mudstone interlayer and carbonaceous mudstone spread widely. The airport requires large amount of fill with the fill height more than 30 m generally and the maximum height over 100 m. The fill therein has high content of carbonaceous mudstone and is featured by high stone content, poor grading, complicated structure, and large difference in mechanical behavior. By means of numerical simulation, the deformation and stability of the high embankment for the airport were studied. The results show that the toe of the high embankment has the maximum horizontal displacement of 0.8 m, thus the fill body has such good stability that the channel slot area has the maximum subsidence of 1.0 m and the bottom foundation the subsidence of 0.6 m; the soil surfaced area has the maximum subsidence of 3.0 m and the bottom foundation the subsidence of 1.6 m.