基于能量的全风化红泥岩安定特性表征

IF 3.3 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Soils and Foundations Pub Date : 2023-10-01 DOI:10.1016/j.sandf.2023.101360
Kang Chen , Shengyang Yuan , Shenxin Pan , Jie Ma , Xianfeng Liu
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引用次数: 0

摘要

风化红泥岩广泛分布于四川盆地。压实风化红泥岩已被用作西南高速铁路路基填料。这种材料在循环荷载作用下的动力响应对路基的长期稳定性至关重要。安定概念被广泛用于表征土壤的永久变形行为。根据轴向应变(Werkeister理论)或单位耗散能(Tao理论)随加载循环的演化,未结合颗粒材料的行为可分为三类:塑性安定、塑性蠕变和增量坍塌。然而,这两种理论都更适用于未结合的颗粒材料,但在用于分离塑性蠕变和增量坍塌行为时存在一些局限性。为了克服现有理论的局限性,在饱和全风化红色泥岩(SFWRM)上进行了26次循环三轴试验,研究了循环加载过程中轴向应变和单位耗散能的演变。在各种循环应力状态下,轴向应变、轴向应变率与单位耗散能级有明显的相关性。基于单位耗散能量随循环应力比的响应,提出了一种新的准则来确定塑性蠕变和增量坍塌之间的极限。与Werkeister准则和Tao准则相比,该准则在识别SFWRM的增量坍塌行为方面表现出更好的性能。
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Energy-based insight into characterization of shakedown behavior of fully weathered red mudstone

Weathered Red mudstone is widely distributed in Sichuan basin. The compacted weathered red mudstone has been used as subgrade fill materials of high-speed railway in southwestern of China. Dynamic responses of such materials under cyclic loading are critical to long-term stability of subgrade. Shakedown concept is widely employed in characterizing the permanent deformation behavior of soils. According to the evolution of axial strain (Werkmeister’s theory) or unit dissipated energy (Tao’s theory) with loading cycles, the behavior of unbound granular materials can be classified into three categories: plastic shakedown, plastic creep and incremental collapse. However, both theories are more suitable for the unbound granular materials with some limitations when used to separate the plastic creep and incremental collapse behavior. To overcome the limitations of the current theories, 26 cyclic triaxial tests were conducted on a saturated fully weathered red mudstone (SFWRM) to study the evolution of axial strain and unit dissipated energy during cyclic loading. A clear dependency of axial strain, axial strain rate on the unit dissipated energy level under various cyclic stress states were observed. A new criterion which is based on the responses of unit dissipated energy with cyclic stress ratio, was proposed to determine the limit between plastic creep and incremental collapse. Comparing with Werkmeister’s criterion and Tao’s criterion, the proposed criterion showed a better performance in identifying the incremental collapse behavior of the SFWRM.

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来源期刊
Soils and Foundations
Soils and Foundations 工程技术-地球科学综合
CiteScore
6.40
自引率
8.10%
发文量
99
审稿时长
5 months
期刊介绍: Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.
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