车辆荷载作用下双层路基层间动应力响应试验研究

发布时间：2018-01-16 12:07

本文关键词：车辆荷载作用下双层路基层间动应力响应试验研究　出处：《振动与冲击》2017年05期 　论文类型：期刊论文

【摘要】：针对层状路基土的动力响应与稳定性评价问题,以某双层路基为工程背景,利用现场实测数据,揭示出硬、软土层界面处存在动应力突变现象,并给出了动应力突变系数;根据室内模型试验数据,以动应力突变系数为试验指标,采用极差分析法对主要影响因素进行了排序;借助动三轴试验获得硬、软土体的临界动应力,推导得出两种土体的动应力水平关联性系数,并提出一种评价路基长期稳定性的"概率区域"方法。研究表明:路基运营后期,硬、软土层压缩模量之比将取代硬壳层厚度,成为影响层间响应的首要因素;埋置较深的下卧软土层是控制路基稳定性的关键层。
[Abstract]:In view of the dynamic response and stability evaluation of layered subgrade soil, taking a double-layer roadbed as the engineering background, using the field measured data, the phenomenon of dynamic stress mutation at the interface of hard and soft soil is revealed. The sudden change coefficient of dynamic stress is given. According to the indoor model test data, the dynamic stress abrupt change coefficient is taken as the test index, and the main influencing factors are sorted by the range analysis method. By means of dynamic triaxial test, the critical dynamic stress of hard and soft soil is obtained, and the horizontal correlation coefficient of dynamic stress of two kinds of soil is derived. A "probabilistic region" method is proposed to evaluate the long-term stability of roadbed. The results show that the ratio of compression modulus of hard and soft soil will replace the thickness of hard shell layer and become the primary factor to affect the interlayer response in the later stage of roadbed operation. The subgrade soft soil is the key layer to control the stability of roadbed.
【作者单位】：燕山大学建筑工程与力学学院;
【基金】：国家自然科学基金资助(51308486)
【分类号】：U416.1
【正文快照】： 随着交通运输量的增加,以及汽车速度和轴重的提高,车辆荷载在路基中产生的动力响应问题已经成为土木工程领域中的研究热点[1]。目前,受车辆振动荷载的随机性、土体性质的复杂性等诸多因素的影响,相关研究工作尚处于不成熟的阶段[2-3]。主要体现在以下几个方面:(1)有关公路路基

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