基于静力贯入的路基压实度确定方法

为了建立公路路基压实度检测的新方法，在研究静力贯入路基变形力学机理基础上，深入考虑路基土体变形的非线性特征，引进分级加载和地基沉降分析的分层总和分析的思想，结合增量广义虎克定律和Duncan-Chang模型，建立了以路基土体初始孔隙率、泊松比、粘聚力和内摩擦角等为参数的路基贯入荷载位移分析模型.基于上述静力贯入位移分析模型，根据实测路基静力贯入荷载位移曲线，引进自适应遗传模拟退火优化反演分析方法，建立了基于静力贯入试验的路基压实度检测方法，该方法不仅可以检测路基压实度，还可以测定路基土体其他物理力学参数，而且，该方法还具有检测速度快和效率高的特点.通过工程实例计算和与现有方法的对比分析，表明了本文方法的合理性与可行性.

Determination Method for the Compactness of Subgrade Based on Static Penetration

In order to set up a new detection method for the compactness of highway subgrade, the subgrade deformation and mechanics mechanism under static penetration were discussed with the nonlinear variation characteristics of the subgrade soil deformation. The idea with step-loading and the layer-wise summation analysis of ground foundation settlement was introduced with the Duncan-Chang model and the incremental generalized Hooke''s law. Therefore, an analysis model between the subgrade penetration load and its displacement with the parameters about initial porosity ratio, Poisson ratio, cohesive strength and angle of internal friction was developed. On the basis of the static penetration displacement analysis model mentioned above, a method of back analysis based on the adaptive genetic simulated-annealing algorithm was recommended according to the subgrade static penetration load and displacement test curves, then a new detection technique for the compactness of subgrade based on static penetration was set up, which can not only detect the compactness of subgrade, but also check the other physical and mechanical parameters of the subgrade soil. And it still has the features with fast and efficient detecting. Moreover, by comparison with the other existing methods and the computation of an engineering example, the proposed method was proved to be reasonable and feasible.