Effect of torsional shear stress on the deformation characteristics of clay under traffic load

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL Transportation Geotechnics Pub Date : 2024-11-01 DOI:10.1016/j.trgeo.2024.101413
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Abstract

The soft clay under the road ground will suffer cyclic torsional shear stress encountered traffic load in addition to axial stress, which will cause further deformation of clay. To investigate the effect of torsional shear stress on the cumulative axial strain of clay, a series of undrained tests under cardioid stress path were performed on K0 consolidated undisturbed samples by using a hollow cylinder apparatus (HCA). The effect of vertical cyclic stress ratio (VCSR) and shear stress ratio (η) on the deformation and degradation characteristics of clay was investigated. The results indicate that there is inconsistency between the strain path and stress path. The increase in η further accelerates the accumulation of axial strain, which resulted from the degradation of clay induced by torsional shear stress. Considering the VCSR and η, a calculation method of degradation index was developed. Furthermore, a cumulative axial strain prediction model of clay under the cardioid stress path was established considering the degradation. This model addresses the limitation of traditional prediction models by considering the impact of torsional shear stress on cumulative axial strain.
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交通荷载下扭转剪应力对粘土变形特性的影响
路基下的软粘土除了轴向应力外,还将受到交通荷载的周期性扭转剪应力,这将导致粘土进一步变形。为了研究扭转剪应力对粘土累积轴向应变的影响,我们使用空心圆筒设备(HCA)对 K0 加固的未扰动样本进行了一系列心向应力路径下的排水试验。研究了垂直循环应力比(VCSR)和剪切应力比(η)对粘土变形和降解特性的影响。结果表明,应变路径和应力路径不一致。η的增加进一步加速了轴向应变的累积,而轴向应变的累积是由扭转剪应力引起的粘土降解造成的。考虑到 VCSR 和 η,开发了降解指数的计算方法。此外,考虑到降解,还建立了心形应力路径下粘土的累积轴向应变预测模型。该模型考虑了扭剪应力对累积轴向应变的影响,解决了传统预测模型的局限性。
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来源期刊
Transportation Geotechnics
Transportation Geotechnics Social Sciences-Transportation
CiteScore
8.10
自引率
11.30%
发文量
194
审稿时长
51 days
期刊介绍: Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.
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