Dynamic properties of Malan loess based on triaxial shear tests

IF 1.4 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Geological Journal Pub Date : 2024-03-11 DOI:10.1002/gj.4941

Haifeng Li, Zhiliang Chen, Lei Zhu, Lin Tang, Guanfei Liu, Liming Qu, Xin Liao, Zhijun Wang, Zi Zeng, Zuowen Zhou

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Abstract

Malan loess possesses unfavourable engineering mechanical properties that may vary depending on the geological context in which it exists. In the context of roadbed loading, the structural characteristics of the loess roadbed often result in uneven settlement, which significantly impacts transportation safety. To investigate the dynamic behaviour of loess under the influence of vehicle loading, groups of dynamic rebound modulus tests were conducted using a dynamic triaxial apparatus. Three key aspects are highlighted: compaction degree, moisture content and stress state. The results reveal that the dynamic rebound modulus of loess tends to increase with higher compaction degrees, decrease with increased moisture content and rise under greater confining pressure. For Maran loess, the water content has the greatest influence on its physical and mechanical properties. Under conditions of a confining pressure of 60 kPa and a deviatoric stress of 30 kPa, as the moisture content increased from w = 9% to w = 18%, the minimum dynamic rebound modulus decreased by 63%.

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基于三轴剪切试验的马兰黄土动态特性

马兰黄土具有不利的工程机械特性，这些特性可能因其所处的地质环境而异。在路基加载的情况下，黄土路基的结构特征往往会导致不均匀沉降，从而严重影响交通安全。为了研究黄土在车辆荷载影响下的动态行为，使用动态三轴仪器进行了多组动态回弹模量测试。重点研究了三个关键方面：压实度、含水量和应力状态。结果表明，黄土的动态回弹模量随着压实度的增加而增大，随着含水量的增加而减小，并在较大的约束压力下增大。对于马兰黄土而言，含水量对其物理和机械特性的影响最大。在约束压力为 60 千帕、偏差应力为 30 千帕的条件下，随着含水量从 w = 9% 增加到 w = 18%，最小动回弹模量下降了 63%。

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来源期刊

Geological Journal 地学-地球科学综合

CiteScore

4.20

自引率

11.10%

发文量

269

审稿时长

3 months

期刊介绍： In recent years there has been a growth of specialist journals within geological sciences. Nevertheless, there is an important role for a journal of an interdisciplinary kind. Traditionally, GEOLOGICAL JOURNAL has been such a journal and continues in its aim of promoting interest in all branches of the Geological Sciences, through publication of original research papers and review articles. The journal publishes Special Issues with a common theme or regional coverage e.g. Chinese Dinosaurs; Tectonics of the Eastern Mediterranean, Triassic basins of the Central and North Atlantic Borderlands). These are extensively cited. The Journal has a particular interest in publishing papers on regional case studies from any global locality which have conclusions of general interest. Such papers may emphasize aspects across the full spectrum of geological sciences.