论文部分内容阅读
在高速公路施工过程中,沉降预测是正确决定路面铺设时间的关键。分级施工和堆载预压是软土地基上路堤施工常用的方法。利用这一特点,该文在传统双曲线沉降预测法的基础上,提出了二种软土地基上路堤分级施工情况下沉降预测的新模型———曲线叠加法和分级双曲线法。前者假设各级荷载增量下的沉降彼此独立,在总荷载作用下的沉降等于各级荷载增量引起的沉降之和;而后者则考虑了土体变形的非线性和固结性质随荷载的变化,将沉降拟合方程中的待定参数在2个不同荷载级中分别确定。应用该文模型,对汕汾高速公路K19+820断面的路面铺设时间进行了预测,并取得了较好的工程应用效果。
In the highway construction process, settlement prediction is the key to correctly determine the pavement time. Grading construction and preloading of pile is a commonly used method of embankment construction on soft soil foundation. Based on the traditional hyperbola settlement prediction method, this paper presents two new models of settlement prediction under the condition of gradual construction of embankments on soft soil foundation --- curve superposition method and classification hyperbolic method. The former assumes that the subsidences under each load increment are independent from each other, and the subsidence under the total load is equal to the sum of the subsidence caused by the load increment at all levels. The latter considers the nonlinear and consolidation properties of soil deformation with load Change, the subsidence fitting equations to be determined parameters were determined at two different load levels. Applying the model, the pavement time of K19 + 820 cross-section of Shan-Fen Expressway is predicted, and the better engineering application result is obtained.