水网密集区粘土路基当量回弹模量的预估分析

基于非饱和土基本理论,利用基质吸力及土水特征曲线的最新研究成果,对受地下水位控制的粘土路基的平衡湿度状态进行了预估分析;同时采用室内重复动三轴试验方法,建立了非饱和粘性路基土动回弹模量的双线性本构经验预估模型。将上述研究成果相结合,创建了综合考虑路基湿度和应力状态的路基当量回弹模量的预估方法,并结合实体工程建立了以地下水位、路基填筑高度为核心的路基当量回弹模量预估方程。通过与试验路上传统测试方法测试结果的对比分析,表明该评价方法具有准确、可靠特点。研究成果从平衡湿度和应力状态耦合控制的角度,对水网密集区粘土路基当量回弹模量的确定提供了新的视角和途径。

Prediction Analysis on Equivalent Resilient Modulus of Clay Subgrade of Water Network Intensive Areas

According to unsaturated soil basic theories,equilibrium moisture of clay subgrade is predicted based on the updated studies of soil suction and soil water characteristic curve.Also,the bilinearity constitutive experience model of resilient modulus of clay soil is presented by triaxial repeated loading tests in laboratory.Using above-mentioned results,a prediction method of equivalent resilient modulus of clay subgrade is established by comprehensively considering subgrade moisture and stress condition.Then,based on the concrete engineering,the prediction function of equivalent resilient modulus of the clay subgrade is provided by taking ground water table and subgrade height as centers.Compared with the results of other traditional testing methods on the same test road,the new prediction method may be used in practice.The results provide new perspectives and standpoints to determine the equivalent resilient modulus mechanics features of clay subgrade structure from two aspects of equilibrium moisture and stress condition.