西正一级公路A标段施工图设计文献综述

 2022-07-15 06:07

非密封稳定路面的非线性强度模型研究

摘 要

在澳大利亚和世界范围内,土稳定在未密封路面上的应用越来越广泛。这些包括使用标准稳定剂,如水泥,粉煤灰,聚合物,树脂,酸,以及使用酶形式的非标准稳定剂。基于这种稳定剂的路面设计主要是基于项目经验或现场特定实验室和/或基于现场测试的性能。基础材料的行为,特别是部分饱和和非线性性质,往往被忽略在设计方法的简单性,目前的地方。本研究利用非饱和库仑强度模型研究了非封闭道路在运行状态下的行为。首先,在粘土的基础上进行了室内试验,研究了粘土的稳定和非稳定强度特性。对模型进行标定后,进行了三维有限元分析,预测了路面在交通荷载作用下的响应。结果表明,采用真实非线性强度包络线对稳定路面的响应与传统路面响应预测有较大差异。因此,在设计过程中需要采用局部饱和和土壤非线性来比目前使用的方法更真实地评估稳定贡献。

关键词:未密封路面;稳定性;非线性强度

Behaviour of unsealed stabilized road pavements using non-linear strength model

ABSTRACT

Applications of soil stabilization in unsealed road pavements are increasing being applied in Australia and worldwide. These include using standard stabilizers such as cement, flyash, polymers, resins, acids, as well as using non-standard stabilizers in the forms of enzymes. The pavement designs based on such stabilizers are predominantly based on either project experience or site specific laboratory and/or field tests based properties. The behaviour of the underlying materials, in particular partial saturation and non-linear nature, is often neglected for simplicity in the design approaches which are currently in-place. The current research investigates the behaviour of unsealed roads subjected to operational traffic using the unsaturated Coulomb-strength model. Firstly, laboratory experiments were conducted on the basis of clay soil to investigate the stabilized and non-stabilized strength properties. Having calibrated the model, 3-D FE analyses were conducted to predict the response of unsealed road pavement under traffic loads. The results showed that the response of stabilized road pavements using realistic non-linear strength envelop is substantially different from the traditional pavement response predictions. Thus, it is required to adopt partial saturation and soil non-linearity for more realistic assessments of stabilization contribution during design than are currently used.

Key words:unsealed road pavements;stabilization;non-linear strength

目 录

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