Predicting moisture-dependent resilient modulus of cohesive soils using soil suction concept
Predicting moisture-dependent resilient modulus of cohesive soils using soil suction concept
复制标题
DOI：
10.1061/(asce)0733-947x(2008)134:1(34
复制
发表时间：
2008-01-01
影响因子：
--
通讯作者：
Khasawneh, Mohammad
中科院分区：
文献类型：
--
作者：
Liang, Robert Y.;Rabab'ah, Samer;Khasawneh, Mohammad
各种路面层材料的弹性模量作为一项重要的材料性能在路面结构设计中得到了广泛的应用。黏性土的应力状态和含水率对测量的弹性模量有显著影响。由于路面下粘性路基土壤中的水分含量由于降水的渗透而发生季节性变化，并且由于粘性土壤的水分和应力相关弹性模量的表征是一项要求苛刻且繁琐的任务，因此实际需要一个弹性模量作为应力状态和水分含量的函数的预测方程。本文利用土吸力的概念，提出了粘性土弹性模量的一个新的预测方程。通过对A-4和A-6土壤的实验数据以及文献中其他数据的验证，验证了该模型的准确性。与现有的预测方程相比，该模型的优点是减少了确定方程中回归系数所需的试验和土壤样品的数量。该预测方程与新机制经验路面设计指南（MEPDG）中的经验方程在预测含水率变化对回弹模量的影响方面具有较好的一致性。该模型考虑了应力状态和含水率对黏性土弹性模量的影响，优于MEPDG经验方程。
The resilient modulus of the materials used in various pavement layers has been used extensively as an important material property in structural design of pavement. The state of stress and moisture content of cohesive soils have been observed to exert significant effects on the measured resilient modulus. Since the moisture content in the cohesive subgrade soils underneath the pavement undergoes seasonal changes due to infiltration of precipitations and since characterization of moisture and stress dependent resilient modulus of cohesive soils is a demanding and tedious task, there is a practical need for a predictive equation for the resilient modulus as a function of stress states and moisture content. This paper presents a new predictive equation for the resilient modulus of cohesive soils using the concept of soil suction. The accuracy of the proposed model is validated against experimental data of A-4 and A-6 soils conducted by the writers as well as by other data available in the literature. The proposed model provides advantages over the existing predictive equations by reducing the number of tests and soil specimens needed for determining the regression coefficients in the equation. The proposed predictive equation compares well with the empirical equation in the new mechanistic empirical pavement design guide (MEPDG) in predicting the effect of moisture content variation on the resilient modulus. The proposed model provides an advantage over the MEPDG empirical equation in taking into account the effects of both the stress state and moisture content on the resilient modulus of cohesive soils.