粗粒土压实特性与高填体沉降规律研究

为研究某中西部地区机场粗粒土的压实特性及其高填体的沉降规律，开展了粗粒土的颗粒分析、重型击实、最大干密度、压缩模量试验，测试和验证了粗粒土的不均匀系数、击实参数等，发现了压实度与压缩模量的良好相关性，建立了此粗粒土压缩模量的预估方程。采用室内试验数据建立了高填体的有限元模型，与实测沉降数据进行对比，分析了多种压实度、填筑高度下高填体的沉降。结果表明，填筑体的沉降与填筑高度为指数幂关系，填筑高度越高，土体压实度对沉降的影响越显著。基于有限元模型的沉降数据，明确了压实度-填筑高度-填筑体沉降的关系，建立了高填体沉降的多元回归方程，为高填方工程现场提供了快捷的沉降计算方法。

Squeezing properties for coarse-grained soil and settlement characteristics of high-filled embankment

In order to study the compaction of coarse-grained soil and the settlement characteristics of high-filled embankment in a central and western region airport, the particle size analysis, heavy-duty compaction tests, maximum dry density, and compression modulus test of coarse-grained soil are carried out. The non-uniform coefficient and compaction parameters of coarse-grained soil were tested and verified. It is found that the compaction degree of the coarse-grained soil has a good correlation with the compressive modulus. The prediction equation of the compressive modulus of the coarse-grained soil is established. Comparing with the experiment data and the measured settlement data from field test, a finite element model with high filling is established. The results show that, the relationship between settlement and filling height of the filling body is exponential power. The higher the filling height, the more significant the influence of soil compactness on the embankment settlement. Based on the settlement data of the finite element model, the relationship between compaction degree, filling height, settlement of high-filled embankment is clarified. Multiple regression equations for settlement of high-filled embankment are established. This provides a quick settlement calculation method for high-filled embankment.